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Interest Rate Swaps - Amounts and Locations of Activity Related to Back-to-Back Interest Rate Swaps within Corporation's Consolidated Balance Sheet (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
3rd Party Interest Rate Swaps [Member] |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |
Notional Amount | $ 11,848,000 | $ 14,814,000
Average Maturity (in years) | 8 years | 9 years 8 months 12 days
Weighted Average Fixed Rate | 4.51% | 4.43%
Weighted Average Variable Rate, description | 1 month LIBOR + 2.37% | 1 month LIBOR + 2.35%
Weighted Average Variable Rate | 2.37% | 2.35%
Fair Value | $ 149,000 | $ 211,000
Customer Interest Rate Swaps [Member] |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |
Notional Amount | $ (11,848,000) | $ (14,814,000)
Average Maturity (in years) | 8 years | 9 years 8 months 12 days
Weighted Average Fixed Rate | 4.51% | 4.43%
Weighted Average Variable Rate, description | 1 month LIBOR + 2.37% | 1 month LIBOR + 2.35%
Weighted Average Variable Rate | 2.37% | 2.35%
Fair Value | $ (149,000) | $ (211,000)

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