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Loans and Allowance for Loan Losses - Summary of Inclusive Capitalized Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 1,159,406 [1] $ 1,136,694 [2]    
Allowance for loan losses (54,057) [3] (46,093) $ (36,862) [3] $ (36,395)
Net loans receivable 1,129,722 1,114,762 987,338  
Bank Holding Company Accounting [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans 1,183,779 1,160,855 1,024,200 1,017,882
Allowance for loan losses (54,057) (46,093)    
Net loans receivable $ 1,129,722 $ 1,114,762    
Percentage of total gross loans 100.00% 100.00%    
Recreation [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 711,223 [1] $ 689,810 [2]    
Allowance for loan losses (22,294) (18,075)    
Recreation [Member] | Bank Holding Company Accounting [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 735,175 $ 713,332 609,999 587,038
Percentage of total gross loans 62.00% 62.00%    
Home Improvement [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 259,432 [1] $ 250,830 [2]    
Allowance for loan losses (3,507) (2,608)    
Home Improvement [Member] | Bank Holding Company Accounting [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 255,899 $ 247,324 193,275 183,155
Percentage of total gross loans 22.00% 21.00%    
Commercial [Member] | Bank Holding Company Accounting [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 68,257 $ 69,767 55,211 64,083
Percentage of total gross loans 6.00% 6.00%    
Medallion [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 120,494 [1] $ 126,287 [2]    
Allowance for loan losses (28,256) (25,410)    
Medallion [Member] | Bank Holding Company Accounting [Member]        
Student Loan Portfolio By Program [Line Items]        
Total gross loans $ 124,448 $ 130,432 $ 165,715 $ 183,606
Percentage of total gross loans 10.00% 11.00%    
[1] Excludes loan premiums of $5,429 resulting from purchase price accounting and $18,944 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] Includes $2,469 of a general reserve for the Company, for current and performing medallion loans under 90 days past due, as an additional buffer against future losses, representing 5% of the total allowance, and 2.07% of the medallion loans under 90 days past due as of March 31, 2020. This figure excludes $17,351 of a general reserve on loans at the Bank, which was netted against loan balances at consolidation on April 2, 2018. Subsequent to April 2, 2018, the Bank recorded a general reserve benefit of $7,266.