The landscape of the American residential mortgage market stands on the precipice of a significant structural shift as the nation’s largest depository institutions prepare for a potential easing of stringent capital requirements. For over a decade, traditional banks have steadily ceded ground to non-bank lenders, a retreat catalyzed by the regulatory aftermath of the 2008 Great Financial Crisis. However, recent signals from the Federal Reserve indicate a willingness to recalibrate the "Basel III Endgame" proposals, potentially providing the capital relief necessary for banks to aggressively re-enter the mortgage space. Industry executives from top-tier institutions suggest that while a strategic pivot will take time, the reduction of capital "drags" could fundamentally alter their appetite for mortgage originations and the retention of mortgage servicing rights (MSRs).
The Historical Retreat: A Decadelong Shift in Market Share
To understand the potential impact of the proposed regulatory changes, one must examine the dramatic contraction of bank participation in the mortgage sector over the last fifteen years. In 2008, depository institutions were the undisputed titans of the industry, accounting for approximately 60% of all mortgage originations and holding a staggering 95% of mortgage servicing rights. These institutions provided the primary liquidity for the American dream of homeownership, leveraging their massive balance sheets to fund and service loans.
Following the collapse of the housing market and the subsequent passage of the Dodd-Frank Wall Street Reform and Consumer Protection Act, banks adopted a significantly more conservative posture. Increased oversight, coupled with the implementation of international capital standards known as Basel III, made holding mortgages—and particularly the rights to service them—prohibitively expensive from a capital-efficiency standpoint. By 2023, the banking sector’s share of originations had plummeted to roughly 35%, while their ownership of MSRs fell to 45%.
The data from Intercontinental Exchange (ICE) further illustrates this retreat in the secondary market. Bank refinance retention, a key metric for maintaining long-term customer relationships, stood at 50% in 2011. By the fourth quarter of 2025, that figure had dwindled to just 22%. This vacuum was filled by non-bank lenders—such as Rocket Mortgage and United Wholesale Mortgage (UWM)—which operate under different regulatory frameworks and do not face the same stringent capital-to-asset ratios as federally insured depositories.
The Catalyst for Change: Federal Reserve’s Regulatory Recalibration
The current optimism among bank executives stems from recent commentary by Federal Reserve Vice Chair Michelle Bowman. Addressing the industry’s concerns regarding the 2023 Basel III "Endgame" proposal—which was largely abandoned after significant industry pushback—Bowman signaled that the central bank is prepared to offer a more nuanced approach. The forthcoming proposals are expected to focus on two critical areas: the risk-weighting of MSRs and the "risk sensitivity" of residential mortgage exposures.
Under current rules, MSRs are often subject to a 250% risk weight. This means that for every dollar of MSR value on a bank’s balance sheet, the bank must hold capital as if it were a much riskier asset. Bowman suggested that the Fed is considering a recalibration of this weight, seeking public comment on a level that more accurately reflects the actual risk profile of these assets. Furthermore, the Fed is looking to move away from uniform capital standards for mortgages, instead proposing requirements tied to loan-to-value (LTV) ratios. This would theoretically reward banks for holding lower-risk, high-equity loans—a staple of conservative bank lending.
Strategic Perspectives: Western Alliance and the MSR Factor
For institutions like Western Alliance Bank, the treatment of MSRs is the primary hurdle to expansion. Western Alliance operates a sophisticated mortgage segment built on three pillars: AmeriHome Mortgage’s correspondent lending platform, warehouse lending, and a balance-sheet portfolio that fluctuates between $12 billion and $14 billion.
Despite being a major player—AmeriHome ranked as the sixth-largest mortgage lender in 2025 with $55 billion in volume—the bank remains constrained by capital rules. Steve Curley, Chief Banking Officer of national business lines at Western Alliance, noted that the bank currently holds approximately $1 billion in MSRs, representing about 1% of total assets. Curley emphasized that while the bank "likes the asset" due to its 8% to 10% yields and the custodial deposits it generates, the current 250% risk weight acts as a ceiling.
"Any changes to Basel III that make mortgage loans easier to put on our balance sheet, or anything that would reduce the risk weight of warehouse lending, would make us interested," Curley stated. He suggested that while the business would not change overnight, revised rules would provide the "capital relief" necessary to encourage broader participation across the banking sector.
Relationship Banking and the Cross-Sell Advantage
While capital rules are a technical barrier, the underlying motivation for banks to return to the mortgage market is the "stickiness" of the product. Mortgages are often viewed as the "anchor" of a retail banking relationship. Data from Citizens Bank, the 30th-largest U.S. mortgage lender, underscores this strategy.
Raman Muralidharan, President of Home Mortgage at Citizens Bank, revealed that customers who hold a mortgage with the bank typically utilize 3.2 different products, compared to just 1.9 products for those without a home loan. Furthermore, the attrition rate for mortgage-holding customers is 75% lower, and revenue from non-mortgage products increases by roughly 50% within those relationships.
Citizens Bank, which saw its mortgage volume grow by 36.9% to $15.2 billion in 2025, currently has a mortgage penetration rate of only 6% among its existing client base. The bank’s long-term goal is to double that figure. Muralidharan argues that the current capital rules fail to reward the bank’s low-risk lending profile, where LTVs are frequently below 70% and delinquency rates are minimal. A shift toward risk-sensitive capital requirements would allow Citizens to "lean in" to its preferred niche of high-quality, low-risk residential lending.
The Wait-and-See Approach of Global Giants
While regional and mid-sized banks are vocal about regulatory relief, global systemically important banks (G-SIBs) like Bank of America (BofA) and U.S. Bank are maintaining a more measured "wait-and-see" stance. These institutions have already optimized their operations to function within the current high-capital environment.
Bank of America, which originated $26.3 billion in 2025, focuses almost exclusively on its massive existing base of 67 million clients. Matt Vernon, Head of Consumer Lending at BofA, indicated that while the bank is monitoring the Fed’s discussions, a change in capital rules might not fundamentally alter its strategy. "We have all of the clients that we need," Vernon said, noting that the bank already possesses the infrastructure to support its growth through organic penetration rather than aggressive market-share acquisition or mergers.
Similarly, U.S. Bank—the 10th-largest lender with $38.5 billion in 2025 volume—is waiting for the finality of the Basel III rules before adjusting its trajectory. John Hummel, Head of Retail Home Lending at U.S. Bank, noted that the industry has been waiting for clarity for years. U.S. Bank has already streamlined its operations by exiting the wholesale channel following its acquisition of MUFG Union Bank, choosing instead to focus on retail, consumer-direct, and correspondent production.
Chronology of the Mortgage Market Transition
The evolution of the bank-mortgage relationship can be traced through several key milestones over the past two decades:
- 2008: The financial crisis leads to a massive contraction in credit; banks hold 60% of originations.
- 2010-2014: Implementation of Dodd-Frank and the initial Basel III standards. Banks begin exiting the wholesale and "subprime" channels.
- 2018: Citizens Bank acquires Franklin American Mortgage Co. to bolster its correspondent and retail presence.
- 2021: Western Alliance acquires AmeriHome Mortgage for $1 billion, signaling a renewed interest in mortgage liquidity provision.
- 2022-2023: Rising interest rates stifle the refinance market. Major banks like U.S. Bank and Citizens Bank shutter their wholesale channels to focus on core retail customers.
- 2023 (July): The initial "Basel III Endgame" proposal is released, met with fierce opposition from the banking lobby due to high capital charges for mortgages.
- 2024-2025: Fed officials, including Michelle Bowman and Jerome Powell, signal a willingness to "re-propose" or significantly modify the capital rules.
- 2025 (Q4): Bank refinance retention hits a near-historic low of 22% as non-banks dominate the market.
Economic Forecast: The 2026 Refinance Wave
The potential for regulatory relief coincides with a shifting macroeconomic outlook. The Mortgage Bankers Association (MBA) forecasts that if interest rates decline as expected, total mortgage volume could rise to $2.2 trillion in 2026. This would represent an 8% increase from previous years, with refinances expected to account for a 34% share of the market.
For banks, a resurgence in refinancing presents a high-margin opportunity to recapture their existing borrowers. If capital rules are eased simultaneously, banks could offer more competitive pricing on 30-year fixed-rate mortgages and jumbo loans, which have traditionally been their stronghold. Additionally, with home equity levels at record highs, banks are doubling down on Home Equity Lines of Credit (HELOCs) as a primary tool for customer retention and capital deployment.
Broader Implications and Analysis
The recalibration of capital rules is not merely a technical adjustment for bank balance sheets; it is a move that could redistribute the risk and liquidity of the entire U.S. housing market. If banks re-enter the market with force, non-bank lenders may face increased competition for high-quality borrowers. Non-banks, which lack the low-cost deposit funding of traditional banks, may find it difficult to compete on price if banks are no longer "taxed" by high capital requirements.
However, the transition will be gradual. Banks have spent years dismantling their wholesale infrastructures and focusing on digital transformation to shorten closing times. Rebuilding the capacity to handle a significantly larger share of the market requires not only capital but also human talent and technological scale.
Furthermore, the Fed’s move toward "risk sensitivity" based on LTV ratios could have a bifurcated effect. While it will likely lower the cost of credit for borrowers with large down payments, it may not provide the same relief for first-time homebuyers or those utilizing low-down-payment programs. This suggests that while banks may reclaim the "prime" and "jumbo" segments, non-banks and government-sponsored enterprises (GSEs) will continue to play a vital role in the broader, more diverse housing market.
Ultimately, the banking industry remains in a holding pattern. The forthcoming proposals from the Federal Reserve will serve as the definitive signal. Should the "capital drag" on mortgages and MSRs be significantly reduced, the American mortgage market may soon see the return of its traditional heavyweights to the center stage.