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Loans and Allowance for Credit Losses - Summary of Inclusive Capitalized Loans (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Jun. 30, 2023
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 2,163,877 [1] $ 1,882,585 [2]        
Allowance for loan losses (79,133) [3] (63,845) [4] $ (74,971) [4] $ (61,535) [3] $ (59,152) [4] $ (50,166) [4]
Net loans receivable 2,123,905 1,853,108   1,855,510    
Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans 2,203,038 1,916,953 2,156,998 1,855,510 1,734,621 1,488,924
Allowance for loan losses (79,133) (63,845)        
Net loans receivable $ 2,123,905 $ 1,853,108        
Percentage of total gross loans 100.00% 100.00%        
Recreation [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 1,302,305 [1] $ 1,146,095 [2]        
Allowance for loan losses (57,032) (41,966)        
Recreation [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 1,346,440 $ 1,183,512 1,331,114 1,171,819 1,096,670 961,320
Percentage of total gross loans 61.00% 62.00%        
Home Improvement [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 753,547 [1] $ 628,877 [2]        
Allowance for loan losses (17,300) (11,340)        
Home Improvement [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 750,508 $ 626,399 728,468 575,210 526,278 436,772
Percentage of total gross loans 34.00% 33.00%        
Commercial [Member]            
Student Loan Portfolio By Program [Line Items]            
Allowance for loan losses $ (3,114) $ (1,049)        
Commercial [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 100,322 $ 92,899 92,637 93,735 96,928 76,696
Percentage of total gross loans 5.00% 5.00%        
Medallion [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 3,927 [1] $ 13,571 [2]        
Allowance for loan losses (1,687) (9,490)        
Medallion [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans 3,927 $ 13,571 3,448 13,973 14,152 14,046
Percentage of total gross loans   1.00%        
Strategic Partnership [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans 1,841 [1] $ 572 [2]        
Strategic Partnership [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 1,841 $ 572 $ 1,331 $ 773 $ 593 $ 90
[1] Excludes $41.0 million of capitalized loan origination costs.
[2] Excludes $34.9 million of capitalized loan origination costs.
[3] As of September 30, 2023 and September 30, 2022, there were no allowance for credit losses and net charge-offs related to the strategic partnership loans.
[4] Represents allowance prior to the adoption of ASU 2016-13.