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Derivative Instruments - Interest Rate Swaps within Balance Sheet (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 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 | $ 22,278 | $ 11,848
Weighted Average Maturity | 7 years 8 months 2 days | 8 years
Weighted Average Fixed Rate | 3.88% | 4.51%
Fair Value | $ (182) | $ 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 | $ (22,278) | $ (11,848)
Weighted Average Maturity | 7 years 8 months 2 days | 8 years
Weighted Average Fixed Rate | 3.88% | 4.51%
Fair Value | $ 182 | $ (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 | 1.23% | 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 | 1.23% | 2.37%

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