Deposits - Summary of Deposit Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Banking and Thrift [Abstract]
NOW and demand	$ 382,406	$ 381,316
Regular savings	216,894	221,004
Money market	643,336	646,603
Brokered money market	90,369	92,798
Total non-certificate accounts	1,333,005	1,341,721
Term certificates of $250,000 or more	156,244	134,649
Term certificates less than $250,000	348,752	313,733
Brokered term certificates	239,837	249,766
Total term certificate accounts	744,833	698,148
Total deposits	$ 2,077,838	$ 2,039,869