Consolidated Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income		$ 107,748,000		$ 93,294,000	$ 74,645,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		13,796,000		10,257,000	(753,000)
Depreciation, amortization and accretion, net		21,939,000		20,658,000	11,329,000
Deferred income tax expense (benefit)		(435,000)		1,823,000	5,494,000
Gain on sale of mortgage loans held for sale		(1,690,000)		(521,000)	(3,602,000)
Origination of mortgage loans held for sale		(105,912,000)		(135,045,000)	(157,304,000)
Proceeds from sale of mortgage loans held for sale		104,152,000		145,133,000	177,910,000
Bank owned life insurance income	[1]	(2,253,000)		(1,597,000)	(914,000)
(Gain)/loss on the disposal of premises and equipment	[1]	30,000		(4,341,000)	78,000
Loss on sale of available for sale debt securities		44,000	[1]	0	0
(Gain)/loss on the sale of other real estate owned		43,000		(46,000)	(163,000)
Loss on disposition of LFA		0		870,000	0
Stock compensation expense		4,464,000		4,394,000	4,565,000
Excess tax benefit from share-based compensation arrangements		(644,000)		(1,713,000)	(1,482,000)
Net change in accrued interest receivable and other assets		(3,941,000)		(14,165,000)	4,007,000
Net change in accrued interest payable and other liabilities		(30,638,000)		(10,259,000)	(11,710,000)
Net cash provided by operating activities		106,703,000		108,742,000	102,100,000
Cash flows from investing activities:
Purchases of available for sale debt securities		(6,025,000)		(196,488,000)	(504,777,000)
Proceeeds from sales of available for sale debt securities		2,412,000		0	0
Proceeeds from sales of acquired available for sale debt securities		0		2,111,000	91,214,000
Proceeds from maturities and paydowns of available for sale debt securities		144,449,000		169,499,000	210,052,000
Purchases of held to maturity debt securities		0		(459,183,000)	0
Proceeds from maturities and paydowns of held to maturity debt securities		33,632,000		145,902,000	0
Purchase of bank owned life insurance		0		(30,000,000)	0
Purchases of FHLB stock		(28,800,000)		0	0
Proceeds from redemption of FHLB stock		23,492,000		2,883,000	8,980,000
Proceeds from the disposition of LFA		0		4,993,000	0
Net change in non-PPP loans		(587,873,000)		(423,622,000)	(342,468,000)
Purchase of loans from broker		0		(82,074,000)	0
Purchases of premises and equipment		(7,731,000)		(18,441,000)	(4,581,000)
Proceeds from sale or disposal of premises and equipment		1,732,000		24,732,000	0
Other investment activities		(14,235,000)		(3,502,000)	(5,181,000)
Proceeds from sales of other real estate owned		624,000		7,168,000	919,000
Cash for acquisition, net of cash acquired		0		349,456,000	24,981,000
Net cash used in investing activities		(424,049,000)		(384,425,000)	(78,874,000)
Cash flows from financing activities:
Net change in deposits		279,496,000		(515,669,000)	759,752,000
Net change in securities sold under agreements to repurchase and federal funds purchased		23,712,000		(9,929,000)	15,037,000
Proceeds from FHLB advances		950,000,000		50,000,000	30,000,000
Repayments of FHLB advances		(800,000,000)		0	(152,744,000)
Repayment of acquired line of credit		0		(3,200,000)	0
Repurchase of common stock		(2,695,000)		(4,806,000)	(3,826,000)
Cash disbursements to non-controlling interest		0		(322,000)	0
Disposition of LFA		0		(915,000)	0
Cash dividends paid		(34,575,000)		(33,301,000)	(28,198,000)
Net cash provided by (used in) financing activities		415,938,000		(518,142,000)	620,021,000
Net change in cash and cash equivalents		98,592,000		(793,825,000)	643,247,000
Beginning cash and cash equivalents		167,367,000		961,192,000	317,945,000
Ending cash and cash equivalents		265,959,000		167,367,000	961,192,000
Supplemental cash flow information:
Interest paid		97,930,000		17,909,000	6,093,000
Income tax paid, net of refunds		35,330,000		20,892,000	14,259,000
Cash paid for operating lease liabilities		4,063,000		3,833,000	2,568,000
Supplemental non-cash activity:
Unfunded commitments in tax credit investments		165,435,000		6,517,000	5,217,000
Due to broker		0		22,245,000	20,998,000
Dividends payable to stockholders		239,000		230,000	220,000
Loans transferred to OREO		0		587,000	7,136,000
Premises and equipment transferred to premises held for sale		871,000		21,662,000	0
Fair value of assets acquired		0		1,403,509,000	1,389,327,000
Cash paid in acquisition		0		30,994,000	28,276,000
Common stock issued in acquisition		0		133,825,000	204,670,000
Non-controlling interest of acquired entity		0		3,094,000	0
Total consideration paid		0		167,913,000	232,946,000
Liabilities assumed		0		1,235,596,000	1,156,381,000
Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member]
Cash flows from investing activities:
Net change in PPP loans		$ 14,274,000		$ 122,141,000	$ 441,987,000

[1] Outside of the scope of ASC 606.