CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 39,227	$ 20,539	$ 35,491
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,800	14,050	5,550
Depreciation and amortization of premises and equipment	3,822	3,827	3,480
Net (accretion) and other amortization	(2,093)	(7,936)	(10,226)
Net amortization on securities	4,009	6,361	6,501
Increase in cash surrender value of bank owned life insurance	(2,219)	(2,250)	(1,929)
Amortization of intangible assets	917	1,047	2,637
Share based compensation expense	3,487	2,585	2,142
Net securities losses (gains)	7,921	(38)	(449)
Decrease (increase) in accrued interest receivable	416	(1,419)	(963)
SBA loans originated for sale	(28,340)	(18,596)	(11,944)
Proceeds from sale of the guaranteed portion of SBA loans	30,898	20,667	13,286
Gain on sale of the guaranteed portion of SBA loans	(2,078)	(1,689)	(1,097)
(Gain) loss on sale of loans	(441)	58	(98)
(Increase) decrease in other assets	(2,373)	5,426	8,331
Increase (decrease) in accrued expenses and other liabilities	3,430	4,194	(6,476)
Net cash provided by operating activities	58,383	46,826	44,236
Cash flows from investing activities:
Purchases of securities available for sale	(255,746)	(116,956)	(462,702)
Purchases of securities, restricted	(505,272)	(654,017)	(537,930)
Purchases of securities held to maturity	(1,000)	(4,128)	(46,495)
Proceeds from sales of securities available for sale	230,372	52,367	264,358
Redemption of securities, restricted	516,593	653,411	527,975
Maturities, calls and principal payments of securities available for sale	92,818	118,092	167,045
Maturities, calls and principal payments of securities held to maturity	20,851	45,334	30,460
Net increase in loans	(213,973)	(526,989)	(206,380)
Proceeds from loan sale	40,133	23,171	18,116
Proceeds from sales of other real estate owned ("OREO"), net			278
Purchase of bank owned life insurance			30,000
Purchase of premises and equipment	(5,325)	(2,069)	(4,270)
Net cash used in investing activities	(80,549)	(411,784)	(279,545)
Cash flows from financing activities:
Net increase in deposits	551,891	408,597	83,120
Net decrease in federal funds purchased	(50,000)	(50,000)	(20,000)
Net (decrease) increase in FHLB advances	(260,855)	5,056	199,666
Repayment of junior subordinated debentures		(352)
Net (decrease) increase in repurchase agreements	(338)	203	(50,217)
Net proceeds from issuance of common stock	1,017	951	48,442
Net proceeds from exercise of stock options			62
Repurchase of surrendered stock from vesting of restricted stock awards	(586)	(350)	(344)
Cash dividends paid	(18,342)	(18,238)	(16,140)
Net cash provided by financing activities	222,787	345,867	244,589
Net increase (decrease) in cash and cash equivalents	200,621	(19,091)	9,280
Cash and cash equivalents at beginning of period	94,747	113,838	104,558
Cash and cash equivalents at end of period	295,368	94,747	113,838
Cash paid for:
Interest	32,254	22,917	16,640
Income taxes	2,474	8,445	$ 21,585
Non-cash investing and financing activities:
Conversion of junior subordinated debentures		$ 15,350
Transfers from portfolio loans to other real estate owned	$ 175