(Parent Company Only) Financial Information - Summary of Statement of Cash Flows (Details) - USD ($) $ in Thousands		12 Months Ended
	Feb. 21, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities
Net Income		$ 29,202	$ 22,141	$ 5,696
Net (increase) decrease in other assets		(14,107)	(4,526)	(315)
Net cash used in operating activities		66,007	22,989	21,946
Cash flows from investing activities
Net cash provided by (used in) investment activities		(511,785)	(164,381)	(295,108)
Cash flows from financing activities
Issuance of common stock, net of related expense	$ 56,800	0	0	24,637
Stock based employment plans		(1,161)	127	142
Net cash provided by financing activities		423,355	176,920	182,077
Net change in cash		(26,423)	35,528	(91,085)
Cash and cash equivalents at beginning of year		136,067	100,539	191,624
Cash and cash equivalents at end of year		109,644	136,067	100,539
Supplemental disclosure of cash flow information:
Cash paid during the period for interest		7,855	6,636	3,521
Parent Company [Member]
Cash flows from operating activities
Net Income		29,202	22,141	5,696
Equity in undistributed (income) loss of subsidiaries		(30,626)	(23,353)	(7,002)
Net (increase) decrease in other assets		(12)	10	0
Net increase (decrease) in other liabilities		12	(48)	(76)
Net cash used in operating activities		(1,424)	(1,250)	(1,382)
Cash flows from investing activities
Net cash paid for bank acquisition		(28,905)	0	0
Investment in unconsolidated subsidiary		(200)	0	0
Decrease (increase) in securities purchased under agreement to resell, maturing within 30 days, net		30,647	(5,487)	(37,044)
Net cash provided by (used in) investment activities		1,542	(5,487)	(37,044)
Cash flows from financing activities
Issuance of common stock, net of related expense		0	0	24,637
Subordinated debt increase		0	6,494	13,208
Stock based employment plans		166	127	142
Net cash provided by financing activities		166	6,621	37,987
Net change in cash		284	(116)	(439)
Cash and cash equivalents at beginning of year		364	480	919
Cash and cash equivalents at end of year		648	364	480
Supplemental disclosure of cash flow information:
Cash paid during the period for interest		$ 1,824	$ 1,487	$ 1,058