Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 42,042	$ 51,691	$ 39,227
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	11,500	5,700	1,800
Depreciation and amortization of premises and equipment	4,319	4,253	3,822
Net (accretion) and other amortization	(940)	(1,375)	(2,093)
Net amortization on securities	3,585	4,365	4,009
Increase in cash surrender value of bank owned life insurance	(2,186)	(2,230)	(2,219)
Amortization of other intangible assets	656	787	917
Share based compensation expense	7,639	3,692	3,487
Net securities (gains) losses	(3,525)	(201)	7,921
Loss on termination of swaps	3,403
Change in fair value of loans held for sale	2,877
(Increase) decrease in accrued interest receivable	(5,658)	328	416
SBA loans originated for sale	(47,741)	(27,419)	(28,340)
Proceeds from sale of the guaranteed portion of SBA loans	52,643	29,922	30,898
Gain on sale of the guaranteed portion of SBA loans	(3,940)	(1,984)	(2,078)
Gain on sale of loans			(441)
(Increase) decrease in other assets	(11,916)	3,942	(2,373)
(Decrease) increase in other liabilities	(5,371)	(1,509)	3,430
Net cash provided by operating activities	47,387	69,962	58,383
Cash flows from investing activities:
Purchases of securities available for sale	(363,224)	(141,297)	(255,746)
Purchases of securities, restricted	(52,988)	(97,206)	(505,272)
Purchases of securities held to maturity			(1,000)
Proceeds from sales of securities available for sale	152,980	46,478	230,372
Redemption of securities, restricted	62,505	88,355	516,593
Maturities, calls and principal payments of securities available for sale	404,093	149,456	92,818
Maturities, calls and principal payments of securities held to maturity	47,505	25,642	20,851
Net increase in loans	(962,582)	(421,024)	(213,973)
Proceeds from loan sale			40,133
Proceeds from sales of other real estate owned ("OREO"), net		297
Purchase of premises and equipment	(5,129)	(3,307)	(5,325)
Net cash used in investing activities	(716,840)	(352,606)	(80,549)
Cash flows from financing activities:
Net increase (decrease) in deposits	1,674,607	(71,728)	551,891
Net decrease in federal funds purchased			(50,000)
Net (decrease) increase in FHLB advances	(220,000)	194,568	(260,855)
Net increase (decrease) in repurchase agreements	224	460	(338)
Net proceeds from issuance of common stock	1,267	1,102	1,017
Purchase of treasury stock	(4,633)	(625)
Repurchase of surrendered stock from vesting of stock plans	(3,181)	(887)	(586)
Cash dividends paid	(19,197)	(18,420)	(18,342)
Net cash provided by financing activities	1,429,087	104,470	222,787
Net increase (decrease) in cash and cash equivalents	759,634	(178,174)	200,621
Cash and cash equivalents at beginning of period	117,194	295,368	94,747
Cash and cash equivalents at end of period	876,828	117,194	295,368
Cash paid for:
Interest	24,037	39,395	32,254
Income taxes	12,457	9,158	2,474
Non-cash investing and financing activities:
Transfers from portfolio loans to loans held for sale	$ 43,019	$ 12,643
Transfers from portfolio loans to other real estate owned			$ 175