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Employee Benefits - Deferred compensation plan (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Appreciation in cash surrender value of bank owned life insurance $ 391,000 $ 382,000 $ 392,000
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Director [Member]
     
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Interest rate on deferred amounts 3.32%    
Net deferrals included in accrued interest payable and other liabilities 1,978,000 2,297,000  
Cash surrender value of life insurance 3,308,000 3,205,000  
Appreciation in cash surrender value of bank owned life insurance $ 103,000 $ 98,000 $ 100,000