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Loans and Allowance for Loan Losses - Summary of Inclusive Capitalized Loans (Detail) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 1,205,776,000 [1] $ 1,136,694,000 [2]    
Allowance for loan losses (57,548,000) [3],[4] (46,093,000) [3],[4] $ (36,395,000) $ (46,093,000)
Net loans receivable 1,172,290,000 1,114,762,000 981,487,000  
Bank Holding Company Accounting [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans 1,229,838,000 1,160,855,000 1,017,882,000  
Allowance for loan losses (57,548,000) (46,093,000)    
Net loans receivable $ 1,172,290,000 $ 1,114,762,000    
Percentage of total gross loans 100.00% 100.00%    
Recreation [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 767,374,000 [1] $ 689,810,000 [2]    
Allowance for loan losses (27,348,000) (18,075,000)    
Recreation [Member] | Bank Holding Company Accounting [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 792,686,000 $ 713,332,000 587,038,000  
Percentage of total gross loans 65.00% 62.00%    
Home Improvement [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 336,885,000 [1] $ 250,830,000 [2]    
Allowance for loan losses (5,157,000) (2,608,000)    
Home Improvement [Member] | Bank Holding Company Accounting [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 334,033,000 $ 247,324,000 183,155,000  
Percentage of total gross loans 27.00% 21.00%    
Commercial [Member] | Bank Holding Company Accounting [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 65,327,000 $ 69,767,000 64,083,000  
Percentage of total gross loans 5.00% 6.00%    
Medallion [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 36,153,000 [1] $ 126,287,000 [2]    
Allowance for loan losses (25,043,000) (25,410,000)    
Medallion [Member] | Bank Holding Company Accounting [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 37,768,000 $ 130,432,000 $ 183,606,000  
Percentage of total gross loans 3.00% 11.00%    
Strategic Partnership [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans [1] $ 24,000      
Allowance for loan losses 0      
Strategic Partnership [Member] | Bank Holding Company Accounting [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 24,000      
[1] Excludes loan premiums of $2,717 resulting from purchase price accounting and $21,345 of capitalized loan origination costs.
[2] Excludes loan premiums of $5,758 resulting from purchase price accounting and $18,403 of capitalized loan origination costs.
[3] As of December 31, 2020, the general reserves previously recorded for the Company’s medallion loan portfolio had been reversed as all loans had been deemed impaired and written down to collateral value.
[4] As of December 31, 2020, there was no allowance for loan losses and net charge-offs related to the strategic partnership loans.