Securities - Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017 USD ($) security	Dec. 31, 2016 USD ($)
Available-for-sale, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	$ 293,958	$ 203,870
Gross Unrealized Losses, Less than 12 Months	(3,085)	(1,585)
Fair Value, Less than 12 Months	290,873	202,285
Amortized Cost, More than 12 Months	7,867	6,995
Gross Unrealized Losses, More than 12 Months	(103)	(96)
Fair Value, More than 12 Months	7,764	6,899
Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	14,624	20,692
Gross Unrealized Losses, Less than 12 Months	(234)	(425)
Fair Value, Less than 12 Months	14,390	20,267
Amortized Cost, More than 12 Months	7,775	8,504
Gross Unrealized Losses, More than 12 Months	(328)	(378)
Fair Value, More than 12 Months	$ 7,447	$ 8,126
Investment Securities Continuous Unrealized Loss Position Qualitative Disclosure Abstract
AFS and HTM, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	9
Securities in Unrealized Loss Position, Continuous Unrealized Loss as percent of Amortized Cost	1.16	1.04
SBA guaranteed securities
Available-for-sale, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	$ 27,130
Gross Unrealized Losses, Less than 12 Months	(35)
Fair Value, Less than 12 Months	27,095
US Treasury and Government
Available-for-sale, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months		$ 100,517
Gross Unrealized Losses, Less than 12 Months		(403)
Fair Value, Less than 12 Months		100,114
Commercial
Available-for-sale, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	12,925
Gross Unrealized Losses, Less than 12 Months	(107)
Fair Value, Less than 12 Months	12,818
Residential
Available-for-sale, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	67,723	60,233
Gross Unrealized Losses, Less than 12 Months	(292)	(405)
Fair Value, Less than 12 Months	67,431	59,828
Amortized Cost, More than 12 Months	5,222	4,121
Gross Unrealized Losses, More than 12 Months	(51)	(25)
Fair Value, More than 12 Months	5,171	4,096
Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	5,715	8,551
Gross Unrealized Losses, Less than 12 Months	(110)	(234)
Fair Value, Less than 12 Months	5,605	8,317
Amortized Cost, More than 12 Months	847	860
Gross Unrealized Losses, More than 12 Months	(28)	(33)
Fair Value, More than 12 Months	819	827
Residential
Available-for-sale, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	174,882	29,916
Gross Unrealized Losses, Less than 12 Months	(2,415)	(492)
Fair Value, Less than 12 Months	172,467	29,424
Amortized Cost, More than 12 Months	2,645	2,874
Gross Unrealized Losses, More than 12 Months	(52)	(71)
Fair Value, More than 12 Months	2,593	2,803
Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	8,909	12,141
Gross Unrealized Losses, Less than 12 Months	(124)	(191)
Fair Value, Less than 12 Months	8,785	11,950
Amortized Cost, More than 12 Months	6,928	7,644
Gross Unrealized Losses, More than 12 Months	(300)	(345)
Fair Value, More than 12 Months	6,628	7,299
Corporate debt securities
Available-for-sale, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months		1,785
Gross Unrealized Losses, Less than 12 Months		(14)
Fair Value, Less than 12 Months		1,771
Obligations of municipal subdivisions
Available-for-sale, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months		236
Gross Unrealized Losses, Less than 12 Months		(1)
Fair Value, Less than 12 Months		235
CRA qualified investment fund
Available-for-sale, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	11,298	11,183
Gross Unrealized Losses, Less than 12 Months	(236)	(270)
Fair Value, Less than 12 Months	$ 11,062	$ 10,913