v3.26.1
Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Jul. 01, 2025
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest-bearing funds deposited in other banks   $ 800,000   $ 800,000  
Non-marketable securities   8,100,000   8,100,000  
Impact of equity investment   5,300,000      
Notes receivable net   2,563,656,000   2,514,825,000 [1]  
Equity securities, fair value   1,800,000   1,800,000  
Gains (Loss) on Equity Securities   300,000      
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest   0   0  
Purchased of equity securities with readily determinable fair value         $ 2,000,000
Investment, Type [Extensible Enumeration]         Equity Securities [Member]
Net loan origination costs   54,300,000   52,000,000  
Net Amortization to interest income   3,000,000 $ 2,300,000    
Fair value adjustments related to loans held for sale   0 0    
Goodwill   150,803,000   150,803,000  
Intangible assets, net   17,340,000   17,701,000  
Amortization of intangible assets   361,000 361,000    
Depreciation and amortization   600,000 600,000    
Amortization expense   1,000,000 $ 1,100,000    
Deferred costs   $ 8,200,000   $ 8,400,000  
Potential dilutive common shares excluded from EPS computation   403,858 59,082    
Tier 1 leverage capital to total assets ratio   15.00%      
Excess Tier 1 leverage capital   $ 61,200,000      
Tier 1 leverage capital   $ 385,900,000      
Capital conversation buffer   2.50%   2.50%  
Series F Preferred Stock          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Redemption price of stock $ 46,000,000        
Non-Interest-Bearing Deposits [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Non-interest-bearing compensating balance   $ 800,000   $ 700,000  
Money Market Funds [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Letter of credit   600,000      
Disposition and Exit of Equity Investments [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Gains (Loss) on Equity Securities   400,000      
Home Improvement [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Notes receivable net   817,143,000   813,185,000 [1]  
Recreation [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Notes receivable net   1,614,849,000   1,562,101,000 [1]  
Medallion Bank [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Amortization of intangible assets   0   $ 0  
New York Taxi Medallion [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Notes receivable net   $ 79,500      
Minimum [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest bearing loan term   5 years      
Estimated useful life of fixed assets   3 years      
Maximum [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest bearing loan term   6 years      
Estimated useful life of fixed assets   10 years      
Maximum [Member] | Equity Securities [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Gains (Loss) on Equity Securities   $ 100,000 $ 100,000    
[1] Excludes $52.0 million of capitalized loan origination costs.