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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, 2016 | Dec. 31, 2015
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 | $ 14,814,000 | $ 6,751,000
Average Maturity (in years) | 9 years 8 months 12 days | 9 years 4 months 24 days
Weighted Average Fixed Rate | 4.43% | 4.42%
Weighted Average Variable Rate,description | 1 month LIBOR + 2.35% | 1 month LIBOR + 2.25%
Weighted Average Variable Rate | 2.35% | 2.25%
Fair Value | $ 211,000 | $ 131,000
Customer Interest Rate Swaps [Member] |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |
Notional Amount | $ (14,814,000) | $ (6,751,000)
Average Maturity (in years) | 9 years 8 months 12 days | 9 years 4 months 24 days
Weighted Average Fixed Rate | 4.43% | 4.42%
Weighted Average Variable Rate,description | 1 month LIBOR + 2.35% | 1 month LIBOR + 2.25%
Weighted Average Variable Rate | 2.35% | 2.25%
Fair Value | $ (211,000) | $ (131,000)

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