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Employee Benefits - Deferred compensation plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Appreciation in cash surrender value of bank owned life insurance $ 596 $ 614 $ 495
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 3.24%    
Net deferrals included in accrued interest payable and other liabilities $ 3,238 3,154  
Cash surrender value of life insurance 3,949 3,519  
Appreciation in cash surrender value of bank owned life insurance $ 105 $ 103 $ 108