v3.26.1
Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Interest-bearing funds deposited in other banks   $ 300,000   $ 300,000   $ 800,000  
Non-marketable securities   8,700,000   8,700,000   8,100,000  
Impact of equity investment   5,300,000   5,300,000      
Notes receivable net   2,735,054,000   2,735,054,000   2,514,825,000 [1]  
Equity securities, fair value   1,800,000   1,800,000   1,800,000  
Gains (Loss) on Equity Securities   200,000   500,000      
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest   0   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       59,700,000   52,000,000  
Net Amortization to interest income   3,700,000 $ 2,600,000 6,700,000 $ 4,900,000    
Fair value adjustments related to loans held for sale   0   0      
Goodwill   150,803,000   150,803,000   150,803,000  
Intangible assets, net   16,979,000   16,979,000   17,701,000  
Amortization of intangible assets   362,000 362,000 723,000 723,000    
Depreciation and amortization   700,000 600,000 1,300,000 1,200,000    
Amortization expense   1,200,000 1,100,000 2,200,000 $ 2,200,000    
Deferred costs   $ 10,200,000   $ 10,200,000   $ 8,400,000  
Potential dilutive common shares excluded from EPS computation       18,311 86,410    
Tier 1 leverage capital to total assets ratio   15.00%   15.00%      
Excess Tier 1 leverage capital   $ 51,400,000   $ 51,400,000      
Tier 1 leverage capital   402,300,000   $ 402,300,000      
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   900,000   $ 900,000   $ 700,000  
Money Market Funds [Member]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Letter of credit   600,000   600,000      
Disposition and Exit of Equity Investments [Member]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Gains (Loss) on Equity Securities   0   400,000      
Home Improvement [Member]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Notes receivable net   886,047,000   886,047,000   813,185,000 [1]  
Recreation [Member]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Notes receivable net   1,699,891,000   1,699,891,000   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   $ 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   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   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 $ (100,000) $ 100,000    
[1] Excludes $52.0 million of capitalized loan origination costs.