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Loans and Allowance for Loan Losses - Summary of Inclusive Capitalized Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Student Loan Portfolio By Program [Line Items]    
Total gross loans [1] $ 1,123,469 $ 319,227
Allowance for loan losses (21,425)  
Net loans receivable 1,128,698  
Bank Holding Company Accounting [Member]    
Student Loan Portfolio By Program [Line Items]    
Total gross loans 1,150,123  
Allowance for loan losses (21,425)  
Net loans receivable 1,128,698  
Recreation [Member]    
Student Loan Portfolio By Program [Line Items]    
Total gross loans [1] 573,620  
Allowance for loan losses (1,963)  
Recreation [Member] | Bank Holding Company Accounting [Member]    
Student Loan Portfolio By Program [Line Items]    
Total gross loans 597,348  
Home Improvement [Member]    
Student Loan Portfolio By Program [Line Items]    
Total gross loans [1] 201,561  
Allowance for loan losses (555)  
Home Improvement [Member] | Bank Holding Company Accounting [Member]    
Student Loan Portfolio By Program [Line Items]    
Total gross loans 195,876  
Commercial [Member]    
Student Loan Portfolio By Program [Line Items]    
Allowance for loan losses (175)  
Commercial [Member] | Bank Holding Company Accounting [Member]    
Student Loan Portfolio By Program [Line Items]    
Total gross loans 80,105  
Medallion [Member]    
Student Loan Portfolio By Program [Line Items]    
Total gross loans 268,183 [1] $ 228,416
Allowance for loan losses (18,732)  
Medallion [Member] | Bank Holding Company Accounting [Member]    
Student Loan Portfolio By Program [Line Items]    
Total gross loans $ 276,794  
[1] Excludes loan premiums of $12,378 resulting from purchase price accounting and $14,267 of capitalized loan origination costs.