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Interest Rate Swaps - 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, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative [Line Items]      
Interest rate contracts $ 409 $ (49) $ (522)
Interest Expense - Subordinated Debentures [Member]
      
Derivative [Line Items]      
Interest expense, Fair Value (400) (390) (402)
Other Income [Member]
      
Derivative [Line Items]      
Other income 0 0 0
Accrued Interest and Other Liabilities [Member]
      
Derivative [Line Items]      
Interest rate contract, fair value $ (1,116) $ (1,745)