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Premises, Equipment and Leases - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Branch
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Depreciation and amortization expense $ 4,666,000 $ 4,034,000 $ 3,982,000
Number of branches to be closed or consolidated 7    
Write-downs of long-term investments in land and buildings related to expected closures 1,520,000    
Lease expense $ 1,180,000 $ 1,260,000 $ 1,170,000