Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Available-for-sale, amortized cost [Abstract]
Due in one year or less	$ 74,264
Due after one through five years	152,755
Due after five through ten years	67,396
Due after ten years	42,389
U.S. government sponsored agency mortgage-backed securities	207,696
Amortized cost	544,500	$ 568,381
CRA investment funds	25,000
Amortized cost	569,500	593,381
Available-for-sale, fair value [Abstract]
Due in one year or less	74,387
Due after one through five years	154,945
Due after five through ten years	70,228
Due after ten years	44,248
U.S. government sponsored agency mortgage-backed securities	210,048
Total debt securities	553,856	570,185
CRA investment funds	25,259
Total securities	579,115	594,936
Held-to-maturity, amortized cost [Abstract]
Due in one year or less	0
Due after one through five years	1,181
Due after five through ten years	480
Due after ten years	0
U.S. government sponsored agency mortgage-backed securities	0
Amortized cost	1,661	1,661
CRA investment funds	0
Total securities	1,661
Held-to-maturity, fair value [Abstract]
Due in one year or less	0
Due after one through five years	1,182
Due after five through ten years	480
Due after ten years	0
U.S. government sponsored agency mortgage-backed securities	0
Total debt securities	1,662	$ 1,651
CRA investment funds	0
Total securities	$ 1,662