CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 51,691	$ 39,227	$ 20,539
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	5,700	1,800	14,050
Depreciation and amortization of premises and equipment	4,253	3,822	3,827
Net (accretion) and other amortization	(1,375)	(2,093)	(7,936)
Net amortization on securities	4,365	4,009	6,361
Increase in cash surrender value of bank owned life insurance	(2,230)	(2,219)	(2,250)
Amortization of intangible assets	787	917	1,047
Share based compensation expense	3,692	3,487	2,585
Net securities (gains) losses	(201)	7,921	(38)
Decrease (increase) in accrued interest receivable	328	416	(1,419)
SBA loans originated for sale	(27,419)	(28,340)	(18,596)
Proceeds from sale of the guaranteed portion of SBA loans	29,922	30,898	20,667
Gain on sale of the guaranteed portion of SBA loans	(1,984)	(2,078)	(1,689)
(Gain) loss on sale of loans		(441)	58
Decrease (increase) in other assets	3,942	(2,373)	5,426
(Decrease) increase in accrued expenses and other liabilities	(1,509)	3,430	4,194
Net cash provided by operating activities	69,962	58,383	46,826
Cash flows from investing activities:
Purchases of securities available for sale	(141,297)	(255,746)	(116,956)
Purchases of securities, restricted	(97,206)	(505,272)	(654,017)
Purchases of securities held to maturity		(1,000)	(4,128)
Proceeds from sales of securities available for sale	46,478	230,372	52,367
Redemption of securities, restricted	88,355	516,593	653,411
Maturities, calls and principal payments of securities available for sale	149,456	92,818	118,092
Maturities, calls and principal payments of securities held to maturity	25,642	20,851	45,334
Net increase in loans	(421,024)	(213,973)	(526,989)
Proceeds from loan sale		40,133	23,171
Proceeds from sales of other real estate owned ("OREO"), net	297
Purchase of premises and equipment	(3,307)	(5,325)	(2,069)
Net cash used in investing activities	(352,606)	(80,549)	(411,784)
Cash flows from financing activities:
Net (decrease) increase in deposits	(71,728)	551,891	408,597
Net decrease in federal funds purchased		(50,000)	(50,000)
Net increase (decrease) in FHLB advances	194,568	(260,855)	5,056
Repayment of junior subordinated debentures			(352)
Net increase (decrease) in repurchase agreements	460	(338)	203
Net proceeds from issuance of common stock	1,102	1,017	951
Purchase of treasury stock	(625)
Repurchase of surrendered stock from vesting of stock plans	(887)	(586)	(350)
Cash dividends paid	(18,420)	(18,342)	(18,238)
Net cash used in financing activities	104,470	222,787	345,867
Net (decrease) increase in cash and cash equivalents	(178,174)	200,621	(19,091)
Cash and cash equivalents at beginning of period	295,368	94,747	113,838
Cash and cash equivalents at end of period	117,194	295,368	94,747
Cash paid for:
Interest	39,395	32,254	22,917
Income taxes	9,158	2,474	8,445
Non-cash investing and financing activities:
Transfers from portfolio loans to loans held for sale	$ 12,643
Conversion of junior subordinated debentures			$ 15,350
Transfers from portfolio loans to other real estate owned		$ 175