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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, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Interest Expense Subordinated Debentures [Member]
Sep. 30, 2012
Interest Expense Subordinated Debentures [Member]
Sep. 30, 2013
Interest Expense Subordinated Debentures [Member]
Sep. 30, 2012
Interest Expense Subordinated Debentures [Member]
Sep. 30, 2013
Other Income [Member]
Sep. 30, 2012
Other Income [Member]
Sep. 30, 2013
Other Income [Member]
Sep. 30, 2012
Other Income [Member]
Sep. 30, 2013
Accrued Interest Payable and Other Liabilities [Member]
Dec. 31, 2012
Accrued Interest Payable and Other Liabilities [Member]
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]                            
Interest rate contracts                         $ (1,241) $ (1,745)
Interest rate contracts 8 (44) 327 (116)                    
Interest expense, Fair Value         (102) (98) (304) (290)            
Other income                 $ 0 $ 0 $ 0 $ 0