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Interest Rate Swaps - Amounts and Locations of Activity Related to Back-to-Back Interest Rate Swaps (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
3rd Party interest rate swaps |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |
Notional Amount, Asset | $ 23,152 | $ 11,848
Average Maturity (in years) | 7 years 2 months 12 days | 8 years
Weighted Average Fixed Rate | 3.85% | 4.51%
Assets (Liabilities), at fair value | $ 485 | $ 149
Customer interest rate swaps |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |
Notional Amount, Liability | $ (23,152) | $ (11,848)
Average Maturity (in years) | 7 years 2 months 12 days | 8 years
Weighted Average Fixed Rate | 3.85% | 4.51%
Assets (Liabilities), at fair value | $ (485) | $ (149)
LIBOR | 3rd Party interest rate swaps |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |
Derivative basis spread on variable rate | 2.24% | 2.37%
LIBOR | Customer interest rate swaps |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |
Derivative basis spread on variable rate | 2.24% | 2.37%

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