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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Derivative [Line Items]          
Interest rate contracts $ 63 $ 17 $ 45 $ (7)  
Interest Expense - Subordinated Debentures [Member]          
Derivative [Line Items]          
Interest expense, Fair Value (94) (95) (189) (191)  
Other Income [Member]          
Derivative [Line Items]          
Other income 0 $ 0 0 $ 0  
Accrued Interest and Other Liabilities [Member]          
Derivative [Line Items]          
Interest rate contracts $ (877)   $ (877)   $ (946)