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Loans and Allowance for Credit Losses - Summary of Inclusive Capitalized Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 2,188,640 $ 2,176,412    
Allowance for credit losses (83,827) [1] (84,235) [2] $ (70,280) [1] $ (63,845) [2]
Net loans receivable 2,144,599 2,131,651    
Bank Holding Company Accounting [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans 2,228,426 2,215,886 1,984,180 1,916,953
Allowance for credit losses (83,827) (84,235)    
Net loans receivable $ 2,144,599 $ 2,131,651    
Percentage of total gross loans 100.00% 100.00%    
Recreation [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 1,320,794 $ 1,292,591    
Allowance for credit losses (60,011) (57,532)    
Recreation [Member] | Bank Holding Company Accounting [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 1,365,165 $ 1,336,226 1,213,380 1,183,512
Percentage of total gross loans 61.00% 60.00%    
Home Improvement [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 755,831 $ 764,069    
Allowance for credit losses (17,930) (21,019)    
Home Improvement [Member] | Bank Holding Company Accounting [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 752,262 $ 760,617 669,642 626,399
Percentage of total gross loans 34.00% 34.00%    
Commercial [Member]        
Student Loan Portfolio By Program [Line Items]        
Allowance for credit losses $ (4,384) $ (4,148)    
Commercial [Member] | Bank Holding Company Accounting [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 106,570 $ 114,827 95,329 92,899
Percentage of total gross loans 5.00% 5.00%    
Taxi Medallion [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 3,560 $ 3,663    
Allowance for credit losses (1,502) (1,536)    
Taxi Medallion [Member] | Bank Holding Company Accounting [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans 3,560 3,663 4,059 13,571
Strategic Partnership [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans 869 553    
Strategic Partnership [Member] | Bank Holding Company Accounting [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 869 $ 553 $ 1,770 $ 572
[1] As of March 31, 2024 and March 31, 2023, there were no allowance for credit losses and net charge-offs related to the strategic partnership loans.
[2] 2023 beginning balance represents allowance prior to the adoption of ASU 2016-13.