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Loans and Allowance for Credit Losses - Summary of Inclusive Capitalized Loans (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 2,117,946 [1] $ 1,882,585 [2]        
Allowance for loan losses (74,971) [3] (63,845) [4] $ (70,280) [4] $ (59,152) [3] $ (50,686) [4] $ (50,166) [4]
Net loans receivable 2,082,027 1,853,108        
Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans 2,156,998 1,916,953 1,984,180 1,734,621 1,569,441 1,488,924
Allowance for loan losses (74,971) (63,845)        
Net loans receivable $ 2,082,027 $ 1,853,108        
Percentage of total gross loans 100.00% 100.00%        
Recreation [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 1,288,000 [1] $ 1,146,095 [2]        
Allowance for loan losses (54,187) (41,966)        
Recreation [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 1,331,114 $ 1,183,512 1,213,380 1,096,670 1,004,091 961,320
Percentage of total gross loans 62.00% 62.00%        
Home Improvement [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 731,199 [1] $ 628,877 [2]        
Allowance for loan losses (16,447) (11,340)        
Home Improvement [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 728,468 $ 626,399 669,642 526,278 473,408 436,772
Percentage of total gross loans 34.00% 33.00%        
Commercial [Member]            
Student Loan Portfolio By Program [Line Items]            
Allowance for loan losses $ (2,518) $ (1,049)        
Commercial [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 92,637 $ 92,899 95,329 96,928 77,867 76,696
Percentage of total gross loans 4.00% 5.00%        
Medallion [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 3,448 [1] $ 13,571 [2]        
Allowance for loan losses (1,819) (9,490)        
Medallion [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans 3,448 $ 13,571 4,059 14,152 13,849 14,046
Percentage of total gross loans   1.00%        
Strategic Partnership [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans 1,331 [1] $ 572 [2]        
Strategic Partnership [Member] | Bank Holding Company Accounting [Member]            
Student Loan Portfolio By Program [Line Items]            
Total gross loans $ 1,331 $ 572 $ 1,770 $ 593 $ 226 $ 90
[1] Excludes $40.4 million of capitalized loan origination costs.
[2] Excludes $34.9 million of capitalized loan origination costs.
[3] As of June 30, 2023 and June 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.