Interest-Bearing Deposits (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Interest-bearing Deposit Liabilities [Abstract]
Total brokered deposits	$ 284,410	$ 112,700
Average interest rate of brokered deposits	1.35%	0.59%
Brokered deposits included in savings deposits	$ 274,130	$ 103,380
Brokered deposits included in time deposits	10,280	9,320
Brokered time-deposits 100000 or more	$ 8,570	$ 7,740