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Loan Servicing - Sensitivity of Fair Value to Changes in key Assumptions (Detail) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Mortgage Loan    
Servicing Assets at Fair Value [Line Items]    
Weighted average life (months) 80 months 12 days 79 months
Constant prepayment rate (annualized) 9.90% 9.90%
Discount rate 9.90% 9.80%
Sensitivity analysis of fair value of interests continued to be held by transferor servicing assets or liabilities impact of zero point two five percent favorable change in prepayment speed $ 1,737 $ 692
Sensitivity analysis of fair value of interests continued to be held by transferor servicing assets or liabilities impact of zero point five zero percent favorable change in prepayment speed 3,220 1,288
Sensitivity analysis of fair value of interests continued to be held by transferor servicing assets or liabilities impact of zero point two five percent adverse change in prepayment speed (1,937) (789)
Sensitivity analysis of fair value of interests continued to be held by transferor servicing assets or liabilities impact of zero point five zero percent adverse change in prepayment speed $ (4,007) $ (1,680)
Small Business Administration Loans    
Servicing Assets at Fair Value [Line Items]    
Weighted average life (months) 63 months 16 days  
Constant prepayment rate (annualized) 9.29%  
Discount rate 14.87%  
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 10 percent adverse change in prepayment speed $ (145)  
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 20 percent adverse change in prepayment speed (284)  
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 1 percent adverse change in prepayment speed 0  
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 2 percent adverse change in prepayment speed 0  
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 10 percent adverse change in discount rate 0  
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 20 percent adverse change in discount rate 0  
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 1 percent adverse change in discount rate (147)  
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 2 percent adverse change in discount rate $ (286)