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Employee Benefit Plans, Directors' Deferred Compensation Plan (Details) - Directors [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]          
Deferred compensation liability $ 914   $ 914   $ 940
Deferred interest expense $ 4 $ 4 $ 9 $ 8