Investment Securities - Unrealized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value
Less than 12 Months	$ 321,631	$ 442,811
12 Months or Longer	21,859	26,420
Total	343,490	469,231
Unrealized Losses
Less than 12 Months	(4,908)	(8,099)
12 Months or Longer	(264)	(176)
Total	(5,172)	(8,275)
U.S. Treasury and U.S. Government-sponsored agencies
Fair Value
Less than 12 Months	4,533
12 Months or Longer	0
Total	4,533
Unrealized Losses
Less than 12 Months	(29)
12 Months or Longer	0
Total	(29)
Municipal securities
Fair Value
Less than 12 Months	36,220	90,188
12 Months or Longer	2,498	0
Total	38,718	90,188
Unrealized Losses
Less than 12 Months	(812)	(2,476)
12 Months or Longer	(52)	0
Total	(864)	(2,476)
Residential
Fair Value
Less than 12 Months	145,878	181,562
12 Months or Longer	12,541	10,854
Total	158,419	192,416
Unrealized Losses
Less than 12 Months	(1,897)	(2,148)
12 Months or Longer	(115)	(52)
Total	(2,012)	(2,200)
Commercial
Fair Value
Less than 12 Months	129,184	157,055
12 Months or Longer	6,820	12,597
Total	136,004	169,652
Unrealized Losses
Less than 12 Months	(2,148)	(3,446)
12 Months or Longer	(97)	(94)
Total	(2,245)	(3,540)
Collateralized loan obligations
Fair Value
Less than 12 Months	2,883	2,976
12 Months or Longer	0	2,969
Total	2,883	5,945
Unrealized Losses
Less than 12 Months	(17)	(1)
12 Months or Longer	0	(30)
Total	(17)	(31)
Corporate obligations
Fair Value
Less than 12 Months		4,032
12 Months or Longer		0
Total		4,032
Unrealized Losses
Less than 12 Months		(9)
12 Months or Longer		0
Total		(9)
Other securities
Fair Value
Less than 12 Months	2,933	6,998
12 Months or Longer	0	0
Total	2,933	6,998
Unrealized Losses
Less than 12 Months	(5)	(19)
12 Months or Longer	0	0
Total	$ (5)	$ (19)