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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 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Interest Expense Subordinated Debentures [Member]
Jun. 30, 2012
Interest Expense Subordinated Debentures [Member]
Jun. 30, 2013
Interest Expense Subordinated Debentures [Member]
Jun. 30, 2012
Interest Expense Subordinated Debentures [Member]
Jun. 30, 2013
Other Income [Member]
Jun. 30, 2012
Other Income [Member]
Jun. 30, 2013
Other Income [Member]
Jun. 30, 2012
Other Income [Member]
Jun. 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                         $ (1,253) $ (1,745)
Interest rate contracts 245 (135) 319 (72)                    
Interest expense, Fair Value         (105) (98) (202) (192)            
Other income                 $ 0 $ 0 $ 0 $ 0