(Parent Company Only) Financial Information - Summary of Statement of Cash Flows (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jan. 31, 2014	Nov. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities
Interest received			$ 110,712	$ 78,564	$ 73,849
Interest paid			(8,086)	(4,508)	(5,584)
Income taxes received			(575)	(239)	(157)
Net cash provided by (used in) operating activities			22,989	21,946	49,852
Cash flows from investing activities
Net cash provided by (used in) investment activities			(164,381)	(295,108)	(89,155)
Cash flows from financing activities
Issuance of common stock, net of related expense	$ 25,000	$ 47,000	0	24,637	46,977
Stock based employment plans			127	142	190
Redemption of preferred stock			0	0	(50,000)
Dividends paid on preferred shares			0	0	(2,819)
Net cash provided by (used in) financing activities			176,920	182,077	55,940
Net change in cash			35,528	(91,085)	16,637
Cash and cash equivalents at beginning of year	191,624		100,539	191,624	174,987
Cash and cash equivalents at end of year			136,067	100,539	191,624
RECONCILIATION OF INCOME (LOSS) TO CASH USED IN OPERATING ACTIVITIES
Net income (loss)			22,141	5,696	51,989
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Other, net			(2,486)	2,954	792
Net cash provided by (used in) operating activities			22,989	21,946	49,852
Parent Company [Member]
Cash flows from operating activities
Interest received			78	43	5
Interest paid			(1,487)	(1,058)	(957)
Dividends received			37	24	23
Income taxes received			0	573	1,797
Other			122	(964)	(494)
Net cash provided by (used in) operating activities			(1,250)	(1,382)	374
Cash flows from investing activities
Decrease (increase) in securities purchased under agreement to resell, maturing within 30 days, net			(5,487)	(37,044)	2,130
Net cash provided by (used in) investment activities			(5,487)	(37,044)	2,130
Cash flows from financing activities
Issuance of common stock, net of related expense			0	24,637	46,977
Subordinated debt increase			6,494	13,208	0
Stock based employment plans			127	142	190
Redemption of preferred stock			0	0	(50,000)
Dividends paid on preferred shares			0	0	(2,819)
Net cash provided by (used in) financing activities			6,621	37,987	(5,652)
Net change in cash			(116)	(439)	(3,148)
Cash and cash equivalents at beginning of year	$ 919		480	919	4,067
Cash and cash equivalents at end of year			364	480	919
RECONCILIATION OF INCOME (LOSS) TO CASH USED IN OPERATING ACTIVITIES
Net income (loss)			22,141	5,696	51,989
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Equity in undistributed income of subsidiaries			(23,353)	(7,002)	(51,088)
Other, net			(38)	(76)	(527)
Net cash provided by (used in) operating activities			$ (1,250)	$ (1,382)	$ 374