CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income	$ 35,491	$ 21,111	$ 13,763
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	5,550	4,000	2,200
Depreciation and (accretion) amortization	(6,746)	(3,789)	481
Net amortization on securities	6,501	4,936	3,763
Increase in cash surrender value of bank owned life insurance	(1,929)	(1,225)	(609)
Amortization of intangible assets	2,637	1,447	300
Share based compensation expense	2,142	1,689	1,234
Net securities (gains) losses	(449)	8	1,090
Increase in accrued interest receivable	(963)	(267)	(777)
Small Business Administration ("SBA") loans originated for sale	(11,944)	(5,043)
Proceeds from sale of the guaranteed portion of SBA loans	13,286	5,659
Gain on sale of the guaranteed portion of SBA loans	(1,097)	(507)
Gain on sale of loans	(98)	(477)
Decrease (increase) in other assets	8,331	(6,815)	5,783
(Decrease) increase in accrued expenses and other liabilities	(6,476)	10,799	(1,417)
Net cash provided by operating activities	44,236	31,526	25,811
Cash flows from investing activities:
Purchases of securities available for sale	(462,702)	(330,646)	(342,185)
Purchases of securities, restricted	(537,930)	(318,887)	(408,439)
Purchases of securities held to maturity	(46,495)	(21,650)	(52,464)
Proceeds from sales of securities available for sale	264,358	75,750	360,963
Redemption of securities, restricted	527,975	308,808	408,036
Maturities, calls and principal payments of securities available for sale	167,045	113,217	80,242
Maturities, calls and principal payments of securities held to maturity	30,460	34,897	37,983
Net increase in loans	(206,380)	(354,375)	(235,320)
Proceeds from loan sale	18,116	21,011
Proceeds from sales of other real estate owned ("OREO"), net	278		2,942
Purchase of bank owned life insurance	(30,000)		(20,000)
Purchase of premises and equipment	(4,270)	(4,325)	(5,232)
Net cash acquired in business combination		24,628	2,926
Net cash used in investing activities	(279,545)	(451,572)	(170,548)
Cash flows from financing activities:
Net increase in deposits	83,120	223,872	125,300
Net (decrease) increase in federal funds purchased	(20,000)	45,000	11,000
Net increase in Federal Home Loan Bank advances	199,666	124,087	1,499
Repayment of acquired unsecured debt			(1,450)
Net (decrease) increase in repurchase agreements	(50,217)	14,628	24,893
Net proceeds from issuance of subordinated debentures		78,324
Net proceeds from issuance of common stock	48,442	779	631
Net proceeds from exercise of stock options	62	80	7
Repurchase of surrendered stock from vesting of restricted stock awards	(344)	(228)	(173)
Excess tax benefit from share based compensation		50	36
Cash dividends paid	(16,140)	(13,415)	(10,657)
Other, net		(303)	(192)
Net cash provided by financing activities	244,589	472,874	150,894
Net increase in cash and cash equivalents	9,280	52,828	6,157
Cash and cash equivalents at beginning of period	104,558	51,730	45,573
Cash and cash equivalents at end of period	113,838	104,558	51,730
Cash paid for:
Interest	16,640	8,793	7,377
Income tax	$ 21,585	8,744	4,068
Noncash investing and financing activities:
Transfers from portfolio loans to OREO		250	577
Acquisition of noncash assets and liabilities:
Fair value of assets acquired		875,302	209,022
Fair value of liabilities assumed		$ 831,422	$ 213,224