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Loans and Allowance for Loan Losses - Summary of Inclusive Capitalized Loans (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Jun. 30, 2022
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 1,821,095 [1] $ 1,461,622 [2]        
Allowance for loan losses (61,535) [3] (50,166) $ (59,152) $ (47,448) [3] $ (46,946) $ (57,548)
Net loans receivable 1,793,975 1,438,758   1,372,233    
Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans 1,855,510 1,488,924 1,734,621 1,419,681 1,340,567 1,229,838
Allowance for loan losses (61,535) (50,166)        
Net loans receivable $ 1,793,975 $ 1,438,758        
Percentage of total gross loans 100.00% 100.00%        
Recreation [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 1,134,989 [1] $ 931,859 [2]        
Allowance for loan losses (40,768) (32,435)        
Recreation [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 1,171,819 $ 961,320 1,096,670 933,790 886,206 792,686
Percentage of total gross loans 63.00% 65.00%        
Home Improvement [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 577,626 [1] $ 438,931 [2]        
Allowance for loan losses (10,208) (7,356)        
Home Improvement [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 575,210 $ 436,772 526,278 398,774 368,257 334,033
Percentage of total gross loans 31.00% 29.00%        
Commercial [Member]            
Student Loan Portfolio By Program [Line Items]            
Allowance for loan losses $ (963) $ (1,141)        
Commercial [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 93,735 $ 76,696 96,928 72,088 69,520 65,327
Percentage of total gross loans 5.00% 5.00%        
Medallion [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 13,973 [1] $ 14,046 [2]        
Allowance for loan losses (9,596) (9,234)        
Medallion [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 13,973 $ 14,046 14,152 14,934 16,514 37,768
Percentage of total gross loans 1.00% 1.00%        
Strategic Partnership [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 773 [1] $ 90 [2]        
Strategic Partnership [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 773 $ 90 $ 593 $ 95 $ 70 $ 24
[1] Excludes loan premiums of $0.1 million and $34.3 million of capitalized loan origination costs.
[2] Excludes loan premiums of $0.5 million and $26.8 million of capitalized loan origination costs.
[3] As of September 30, 2022 and September 30, 2021, there were no allowance for loan losses and net charge-offs related to the strategic partnership loans.