Deposits - Scheduled Deposits of $250,000 or More (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deposits [Abstract]
Three months or less	$ 1,876
Over three months to six months	652
Over six months to twelve months	2,439
Over twelve months	34,022
Time Deposits, $250,000 or more	$ 38,989	$ 29,400