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Deposits - Stratification of Time Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Banking and Thrift [Abstract]    
Time deposits of less than $100 thousand $ 39,361 $ 36,346
Time deposits of $100 thousand to $250 thousand 68,391 66,092
Time deposits of more than $250 thousand 52,364 49,025
Total time deposits $ 160,116 $ 151,463