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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Significant Components Of Deferred Tax Assets And Liabilities [Line Items]    
Allowance for credit losses $ 23,515 $ 21,432
Postretirement benefits other than pensions 769 841
Alternative minimum tax credit carryforward 13,026 15,247
Net operating loss carryforward 0 1,626
Writedown of other real estate owned 3,647 2,876
Other tax credit carryforward 0 1,383
Deferred compensation 2,203 2,215
Swap credit risk 772 1,037
Accrued interest on nonaccrual loans 3,887 3,161
Other-than-temporary impairment of securities 15,233 15,764
Capitalization of OREO expenses 847 826
Depreciation of assets 952 0
Unfunded loan commitment allowance 836 536
Other 1,176 2,822
Total deferred tax assets 66,863 69,766
Basis difference in assets acquired (808) (1,213)
Loan origination fees and costs (606) (392)
Income from unconsolidated subsidiary (575) (551)
Unrealized gain on securities available for sale (592) (898)
Depreciation of assets 0 (242)
Other (150) (198)
Total deferred tax liabilities (2,731) (3,494)
Net deferred tax asset $ 64,132 $ 66,272