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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
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Derivative [Line Items]      
Interest rate contracts $ 55 $ (25)  
Accrued Interest and Other Liabilities [Member]      
Derivative [Line Items]      
Interest rate contract, fair value (374)   $ (459)
Interest Expense - Subordinated Debentures [Member]      
Derivative [Line Items]      
Interest expense, Fair Value (76) (89)  
Other Income [Member]      
Derivative [Line Items]      
Other income $ 0 $ 0