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Employee Benefit Plans, Directors' Deferred Compensation Plan (Details) - Directors [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Deferred compensation liability $ 896   $ 928
Deferred interest expense $ 5 $ 5