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Loans and Allowance for Loan Losses - Summary of Inclusive Capitalized Loans (Detail) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 1,255,215,000 [1] $ 1,136,694,000 [2]        
Allowance for loan losses (90,510,000) [3],[4] (46,093,000) $ (66,977,000) $ (43,113,000) [3],[4] $ (40,670,000) $ (36,395,000)
Net loans receivable 1,190,544,000 1,114,762,000   1,099,169,000    
Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans 1,281,054,000 1,160,855,000 1,260,594,000 1,142,282,000 1,088,475,000 1,017,882,000
Allowance for loan losses (90,510,000) (46,093,000)        
Net loans receivable $ 1,190,544,000 $ 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 $ 777,093,000 [1] $ 689,810,000 [2]        
Allowance for loan losses (27,982,000) (18,075,000)        
Recreation [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 802,938,000 $ 713,332,000 786,785,000 706,393,000 668,540,000 587,038,000
Percentage of total gross loans 63.00% 62.00%        
Home Improvement [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 318,592,000 [1] $ 250,830,000 [2]        
Allowance for loan losses (4,751,000) (2,608,000)        
Home Improvement [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 315,442,000 $ 247,324,000 282,072,000 230,726,000 209,549,000 183,155,000
Percentage of total gross loans 25.00% 21.00%        
Commercial [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 71,369,000 $ 69,767,000 71,476,000 68,209,000 64,442,000 64,083,000
Percentage of total gross loans 5.00% 6.00%        
Medallion [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 88,154,000 [1] $ 126,287,000 [2]        
Allowance for loan losses (57,777,000) (25,410,000)        
Medallion [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 91,298,000 $ 130,432,000 120,253,000 136,954,000 $ 145,944,000 $ 183,606,000
Percentage of total gross loans 7.00% 11.00%        
Strategic Partnership [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans [1] $ 7,000          
Allowance for loan losses 0     $ 0    
Strategic Partnership [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 7,000   $ 8,000      
[1] Excludes loan premiums of $4,358 resulting from purchase price accounting and $21,481 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 September 30, 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 September 30, 2020, there was no allowance for loan losses and net charge-offs related to the strategic partnership loans.