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Loans and Allowance for Loan Losses - Summary of Nonperforming Loan Portfolio (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]        
Recorded Investment, With related allowance $ 48,702 $ 48,702    
Unpaid principal balance, With related allowance 50,094 50,094    
Related allowance, With related allowance 10,368 10,368    
Average investment recorded, With related allowance 67,784 65,370    
Interest income recognized, With related allowance 125 434    
Recreation [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Recorded Investment, With related allowance 5,075 5,075    
Unpaid principal balance, With related allowance 5,075 5,075    
Related allowance, With related allowance 180 180    
Average investment recorded, With related allowance 5,494 4,496    
Interest income recognized, With related allowance 106 231    
Home Improvement [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Recorded Investment, With related allowance 167 167    
Unpaid principal balance, With related allowance 167 167    
Related allowance, With related allowance 3 3    
Average investment recorded, With related allowance 178 119    
Commercial [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Recorded Investment, With related allowance 5,403 5,403    
Unpaid principal balance, With related allowance 5,814 5,814    
Related allowance, With related allowance 100 100    
Average investment recorded, With related allowance 7,047 5,838    
Interest income recognized, With related allowance 82 12    
Recorded investment [1],[2],[3]     $ 11,600 $ 18,623
Unpaid principal balance,total non performing loans [2]     18,867 20,491
Average recorded investment [2]     11,951 18,792
Medallion [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Recorded Investment, With related allowance 38,057 38,057    
Unpaid principal balance, With related allowance 39,038 39,038    
Related allowance, With related allowance 10,085 10,085    
Average investment recorded, With related allowance 55,065 54,917    
Interest income recognized, With related allowance $ 101 $ 215    
Recorded investment [1],[2],[3]     120,716 79,871
Unpaid principal balance,total non performing loans [2]     123,199 82,612
Average recorded investment [2]     $ 124,944 $ 128,671
[1] As of December 31, 2017 and September 30, 2017, $20,851 and $55,871 of unrealized depreciation was recorded as a valuation allowance on these loans.
[2] Included in the unpaid principal balance is unearned paid-in-kind interest on nonaccrual loans of $4,609 and $9,750 as of December 31, 2017 and September 30, 2017, which is included in the nonaccrual disclosures on page 25.
[3] Interest income of $124 and $1,383 was recognized on loans for the three and nine months ended September 30, 2017.