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LOAN SERVICING - Sensitivity of Fair Value to Changes in key Assumptions (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Mortgage Servicing Rights [Member]    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Weighted average life (months) 84 months 25 days 80 months 12 days
Constant prepayment rate (annualized) 9.10% 9.90%
Discount rate 9.90% 9.90%
Sensitivity analysis of fair value, change in interest rates, plus .25% $ 1,286 $ 1,737
Sensitivity analysis of fair value, change in interest rates, plus .50% 2,319 3,220
Sensitivity analysis of fair value, change in interest rates, minus .25% (1,584) (1,937)
Sensitivity analysis of fair value, change in interest rates, minus .50% $ (3,498) $ (4,007)
SBA-Guaranteed Loan Servicing [Member]    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Weighted average life (months) 58 months 6 days 63 months 16 days
Constant prepayment rate (annualized) 10.51% 9.29%
Discount rate 15.08% 14.87%
Effect on fair value due to 10% adverse change of consistent repayment rate $ (161) $ (145)
Effect on fair value due to 20% adverse change of consistent repayment rate (312) (284)
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 1 percent adverse change in prepayment speed 0 0
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 2 percent adverse change in prepayment speed 0 0
Effect on fair value due to 10% adverse change of discount rate 0 0
Effect on fair value due to 20% adverse change of discount rate 0 0
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 1 percent adverse change in discount rate (138) (147)
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 2 percent adverse change in discount rate $ (269) $ (286)