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Premises, Equipment and Leases - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Write-downs of long-term investments in land and buildings related to expected closures $ 935,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf $ 1,520,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf  
Depreciation and amortization expense 4,405,000us-gaap_DepreciationNonproduction 4,666,000us-gaap_DepreciationNonproduction 4,034,000us-gaap_DepreciationNonproduction
Lease expense $ 1,060,000us-gaap_OperatingLeasesRentExpenseNet $ 1,180,000us-gaap_OperatingLeasesRentExpenseNet $ 1,260,000us-gaap_OperatingLeasesRentExpenseNet