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Loans and Allowance for Loan Losses - Summary of Inclusive Capitalized Loans (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
[3]
Dec. 31, 2017
Student Loan Portfolio By Program [Line Items]      
Total gross loans $ 1,064,343 [1]   $ 319,227
Allowance for loan losses (29,484)    
Net loans receivable 1,060,061    
Bank Holding Company Accounting [Member]      
Student Loan Portfolio By Program [Line Items]      
Total gross loans 1,089,545    
Allowance for loan losses (29,484) [2] $ (21,425)  
Net loans receivable [4] $ 1,060,061    
Percentage of total gross loans 100.00%    
Recreation [Member]      
Student Loan Portfolio By Program [Line Items]      
Total gross loans [1] $ 556,298    
Allowance for loan losses (2,880)    
Recreation [Member] | Bank Holding Company Accounting [Member]      
Student Loan Portfolio By Program [Line Items]      
Total gross loans $ 575,875    
Percentage of total gross loans 53.00%    
Home Improvement [Member]      
Student Loan Portfolio By Program [Line Items]      
Total gross loans [1] $ 171,994    
Allowance for loan losses (861)    
Home Improvement [Member] | Bank Holding Company Accounting [Member]      
Student Loan Portfolio By Program [Line Items]      
Total gross loans $ 169,642    
Percentage of total gross loans 16.00%    
Commercial [Member]      
Student Loan Portfolio By Program [Line Items]      
Allowance for loan losses $ (100)    
Commercial [Member] | Bank Holding Company Accounting [Member]      
Student Loan Portfolio By Program [Line Items]      
Total gross loans $ 82,558    
Percentage of total gross loans 7.00%    
Medallion [Member]      
Student Loan Portfolio By Program [Line Items]      
Total gross loans $ 253,493 [1]   $ 228,416
Allowance for loan losses (25,643)    
Medallion [Member] | Bank Holding Company Accounting [Member]      
Student Loan Portfolio By Program [Line Items]      
Total gross loans $ 261,470    
Percentage of total gross loans 24.00%    
[1] Excludes loan premiums of $10,606 resulting from purchase price accounting and $14,596 of capitalized loan origination costs.
[2] Includes $15,587 of a general reserve for current and performing medallion loans under 90 days past due, as an additional buffer against future losses, representing 53% of the total allowance, and 7% of the loans in question.
[3] Beginning balance for the six months September 30, 2018 ended reflects the transition to Bank Holding Company Accounting by netting previously established unrealized depreciation against the gross loan balances resulting in a starting point of zero for this table.
[4] See Note 18 for details of balances related to a consolidated variable interest entity.