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Derivative Instruments - Amounts and Locations of Activity Related to Interest Rate Swaps Designated as Cash Flow Hedges within Corporation's Consolidated Balance Sheet and Statement of Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Derivative [Line Items]          
Interest rate contracts $ 46 $ 87 $ 141 $ 92  
Accrued Interest and Other Liabilities [Member]          
Derivative [Line Items]          
Interest rate contract, fair value (242)   (242)   $ (459)
Interest Expense - Subordinated Debentures [Member]          
Derivative [Line Items]          
Interest expense, Fair Value (71) (84) (220) (260)  
Other Income [Member]          
Derivative [Line Items]          
Other income $ 0 $ 0 $ 0 $ 0