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Derivative Instruments - Amounts and Locations of Activity Related to Back-to-Back Interest Rate Swaps within Corporation's Consolidated Balance Sheet (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 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 $ 14,647,000 $ 14,814,000
Weighted Average Maturity (in years) 8 years 6 months 9 years
Weighted Average Fixed Rate 4.43% 4.43%
Weighted Average Variable Rate, Description 1 month LIBOR + 2.35% 1 month LIBOR + 2.35%
Weighted Average Variable Rate 2.35% 2.35%
Fair Value $ 235,000 $ 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 $ (14,647,000) $ (14,814,000)
Weighted Average Maturity (in years) 8 years 6 months 9 years
Weighted Average Fixed Rate 4.43% 4.43%
Weighted Average Variable Rate, Description 1 month LIBOR + 2.35% 1 month LIBOR + 2.35%
Weighted Average Variable Rate 2.35% 2.35%
Fair Value $ (235,000) $ (211,000)