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Loans and Allowance for Loan Losses - Summary of Allowance for Loan Losses by Type (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Financing Receivable Recorded Investment Past Due [Line Items]        
Allowance for loan losses - ending balance $ 57,548 [1],[2] $ 46,093 [1],[2] $ 36,395 $ 46,093
Percentage of Allowance 100.00% 100.00%    
Allowance as a Percent of Loan Category 4.68% 3.97%    
Allowance as a Percent of Nonaccrual 93.17% 174.04%    
Recreation [Member]        
Financing Receivable Recorded Investment Past Due [Line Items]        
Allowance for loan losses - ending balance $ 27,348 $ 18,075    
Percentage of Allowance 48.00% 39.00%    
Allowance as a Percent of Loan Category 3.45% 2.53%    
Allowance as a Percent of Nonaccrual 378.20% 228.25%    
Home Improvement [Member]        
Financing Receivable Recorded Investment Past Due [Line Items]        
Allowance for loan losses - ending balance $ 5,157 $ 2,608    
Percentage of Allowance 9.00% 6.00%    
Allowance as a Percent of Loan Category 1.54% 1.05%    
Medallion [Member]        
Financing Receivable Recorded Investment Past Due [Line Items]        
Allowance for loan losses - ending balance $ 25,043 $ 25,410    
Percentage of Allowance 43.00% 55.00%    
Allowance as a Percent of Loan Category 66.31% 19.48%    
Allowance as a Percent of Nonaccrual 68.01% 389.84%    
[1] As of December 31, 2020, the general reserves previously recorded for the Company’s medallion loan portfolio had been reversed as all loans had been deemed impaired and written down to collateral value.
[2] As of December 31, 2020, there was no allowance for loan losses and net charge-offs related to the strategic partnership loans.