Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income		$ 93,294	$ 74,645	$ 58,869
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		10,257	(753)	18,418
Depreciation, amortization and accretion, net		20,658	11,329	9,743
Deferred income tax expense (benefit)		1,823	5,401	(7,508)
Gain on sale of mortgage loans held for sale		(521)	(3,602)	(4,713)
Origination of mortgage loans held for sale		(135,045)	(157,304)	(258,525)
Proceeds from sale of mortgage loans held for sale		145,133	177,910	249,439
Bank owned life insurance income	[1]	(1,597)	(914)	(693)
(Gain)/loss on the disposal of premises and equipment	[1]	(4,369)	78	(150)
(Gain)/loss on the sale of other real estate owned		(46)	(163)	73
Loss on disposition of LFA		870	0	0
Stock compensation expense		4,394	4,565	3,262
Excess tax benefit from share-based compensation arrangements		(1,713)	(1,482)	(452)
Net change in accrued interest receivable and other assets		(14,137)	4,007	(20,880)
Net change in accrued interest payable and other liabilities		(10,259)	(11,617)	30,242
Net cash provided by operating activities		108,742	102,100	77,125
Cash flows from investing activities:
Purchases of available for sale debt securities		(196,488)	(504,777)	(455,368)
Proceeeds from sales of acquired available for sale debt securities		2,111	91,214	0
Proceeds from maturities and paydowns of available for sale debt securities		169,499	210,052	348,736
Purchases of held to maturity debt securities		(459,183)	0	0
Proceeds from maturities and paydowns of held to maturity debt securities		145,902	0	0
Purchase of bank owned life insurance		(30,000)	0	0
Proceeds from redemption of Federal Home Loan Bank stock		2,883	8,980	0
Proceeds from the disposition of LFA		4,993	0	0
Proceeds from the sale of held for investment loans		0	0	2,794
Net change in non-PPP loans		(423,622)	(342,468)	(144,353)
Purchase of loans from broker		(82,074)	0	0
Purchases of premises and equipment		(18,441)	(4,581)	(5,458)
Proceeds from sale or disposal of premises and equipment		24,732	0	1,240
Other investment activities		(3,502)	(5,181)	(2,381)
Proceeds from sales of other real estate owned		7,168	919	258
Cash for acquisition, net of cash acquired		349,456	24,981	0
Net cash used in investing activities		(384,425)	(78,874)	(804,718)
Cash flows from financing activities:
Net change in deposits		(515,669)	759,752	854,618
Net change in securities sold under agreements to repurchase and federal funds purchased		(9,929)	15,037	16,661
Proceeds from Federal Home Loan Bank advances		50,000	30,000	100,000
Repayments of Federal Home Loan Bank advances		0	(152,744)	(148,495)
Repayment of acquired line of credit		(3,200)	0	0
Repurchase of common stock		(4,534)	(3,618)	(2,265)
Share repurchases related to compensation plans		(272)	(208)	(224)
Cash disbursements to non-controlling interest		(322)	0	0
Disposition of LFA		(915)	0	0
Cash dividends paid		(33,301)	(28,198)	(24,481)
Net cash provided by financing activities		(518,142)	620,021	795,814
Net change in cash and cash equivalents		(793,825)	643,247	68,221
Beginning cash and cash equivalents		961,192	317,945	249,724
Ending cash and cash equivalents		167,367	961,192	317,945
Supplemental cash flow information:
Interest paid		17,909	6,093	12,199
Income tax paid, net of refunds		20,892	14,259	12,468
Cash paid for operating lease liabilities		3,833	2,568	2,218
Supplemental non-cash activity:
Unfunded commitments in tax credit investments		6,517	5,217	8,958
Loans purchased and not settled		0	0	5,000
Due to broker		22,245	20,998	0
Dividends payable to stockholders		230	220	213
Loans transferred to OREO		587	7,136	119
Premises and equipment transferred to premises held for sale		21,662	0	0
Fair value of assets acquired		1,403,509	1,389,327	0
Cash paid in acquisition		30,994	28,276	0
Common stock issued in acquisition		133,825	204,670	0
Non-controlling interest of acquired entity		3,094	0	0
Total consideration paid		167,913	232,946	0
Liabilities assumed		1,235,596	1,156,381	0
Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member]
Cash flows from investing activities:
Net change in PPP loans		$ 122,141	$ 441,987	$ (550,186)

[1] Outside of the scope of ASC 606.