v3.25.4
Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Interest-bearing funds deposited in other banks $ 800,000 $ 1,300,000    
Non-marketable securities 8,100,000 9,200,000    
Impact of equity investment 5,700,000      
Notes receivable net 2,514,825,000 [1] 2,444,376,000 [2]    
Equity securities, fair value 1,800,000 1,700,000    
Gains (Loss) on Equity Securities 24,600,000 (6,900,000)    
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 52,000,000 46,600,000    
Net Amortization to income 10,600,000 9,200,000 $ 8,300,000  
Fair value adjustments related to loans held for sale 0 0    
Goodwill 150,803,000 150,803,000    
Intangible assets, net $ 17,701,000 19,146,000    
Goodwill impairment long term growth rate 3.00%      
Amortization of intangible assets $ 1,445,000 1,445,000 1,445,000  
Depreciation and amortization 2,500,000 700,000 400,000  
Amortization expense 4,300,000 4,000,000 $ 3,100,000  
Deferred costs $ 8,400,000 $ 8,200,000    
Potential dilutive common shares excluded from EPS computation 25,859 59,902 92,310  
Tier 1 leverage capital to total assets ratio 15.00%      
Excess Tier 1 leverage capital $ 71,700,000      
Tier 1 leverage capital $ 383,800,000      
Capital conversation buffer 2.50% 2.50%    
Non-Interest-Bearing Deposits [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Non-interest-bearing compensating balance $ 700,000 $ 400,000    
Income Approach [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Goodwill impairment assessment rate 50.00%      
Earnings Based Market Approach [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Goodwill impairment assessment rate 25.00%      
Book Value Based Market Approach [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Goodwill impairment assessment rate 25.00%      
Disposition and Exit of Equity Investments [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Gains (Loss) on Equity Securities $ 24,800,000 8,900,000    
Home Improvement [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Notes receivable net $ 813,185,000 [1] 831,077,000 [2]    
Goodwill impairment assessment rate based on discount 16.20%      
Recreation [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Notes receivable net $ 1,562,101,000 [1] 1,492,540,000 [2]    
Goodwill impairment assessment rate based on discount 16.20%      
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      
Equity Securities [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Gains (Loss) on Equity Securities $ 100,000      
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      
Tier 1 leverage capital to total assets ratio 15.00%      
Maximum [Member] | Equity Securities [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Gains (Loss) on Equity Securities   $ (100,000)    
[1] Excludes $52.0 million of capitalized loan origination costs.
[2] Excludes $46.6 million of capitalized loan origination costs.