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Employee Benefits - Deferred compensation plan (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Appreciation in cash surrender value of bank owned life insurance $ 495 $ 391 $ 382
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 2.85%    
Net deferrals included in accrued interest payable and other liabilities 2,976 1,978  
Cash surrender value of life insurance 3,416 3,308  
Appreciation in cash surrender value of bank owned life insurance $ 108 $ 103 $ 98