Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows From Operating Activities
Net income	$ 95,644	$ 81,477	$ 92,046
Reconciliation of net income to net cash provided by operating activities:
Provision for credit losses	15,031	35,039	2,263
Deferred tax expense (benefit)	(4,800)	(10,007)	1,588
Net security premium amortization	14,058	5,019	2,653
Loan discount accretion	(8,814)	(6,328)	(5,974)
Other purchase accounting accretion and amortization, net	(47)	81	(9)
Foreclosed property losses and write-downs, net	24	547	939
Losses (gains) on securities available for sale	1,237	(8,024)	(97)
Other (gains) losses	(1,648)	54	169
Bank-owned life insurance income	(2,885)	(2,533)	(2,564)
(Decrease) increase in net deferred loan fees	(1,994)	5,639	(642)
Depreciation of premises and equipment	6,187	5,838	5,836
Amortization of operating lease right-of-use assets	1,937	2,012	1,857
Repayments of lease obligations	(1,814)	(1,844)	(1,669)
Stock-based compensation expense	2,268	2,540	2,270
Amortization of intangible assets	3,531	3,956	4,858
Amortization of SBA servicing assets	2,272	1,795	1,340
Fees/gains from sales of presold mortgages and SBA loans	(18,304)	(22,156)	(12,219)
Originations of presold mortgage loans in process of settlement	(326,019)	(418,394)	(173,705)
Proceeds from sales of presold mortgage loans in process of settlement	359,300	410,898	162,476
Origination of SBA loans for sale	(88,304)	(147,934)	(150,677)
Proceeds from sales of SBA loans	79,125	115,460	124,527
Increase in accrued interest receivable	(773)	(3,624)	(644)
Decrease (increase) in other assets	13,978	(991)	(3,171)
(Decrease) increase in accrued interest payable	(683)	(1,250)	178
(Decrease) increase in other liabilities	394	9,805	(391)
Net cash provided by operating activities	138,901	57,075	51,238
Cash Flows From Investing Activities
Purchases of securities available for sale	(1,572,355)	(1,060,054)	(498,891)
Purchases of securities held to maturity	(271,169)	(133,611)	0
Proceeds from maturities/issuer calls of securities available for sale	358,259	223,842	158,920
Proceeds from maturities/issuer calls of securities held to maturity	13,642	33,030	32,461
Proceeds from sales of securities available for sale	106,484	219,697	39,797
Redemptions of FRB and FHLB stock	2,043	9,851	4,088
Purchases of bank owned life insurance	(25,000)	0	0
Net increase in loans	(97,559)	(233,788)	(165,203)
Proceeds from sales of foreclosed properties	3,995	2,485	5,877
Purchases of premises and equipment	(9,402)	(12,363)	(3,534)
Proceeds from sales of premises and equipment	313	189	1,799
Net cash received (paid) in acquisition activities	208,992	(9,559)	0
Net cash received in disposition activities	11,314	0	0
Net cash used by investing activities	(1,270,443)	(960,281)	(424,686)
Cash Flows From Financing Activities
Net increase in deposits	1,258,193	1,342,340	272,206
Net decrease in short-term borrowings	0	(198,000)	(55,000)
Proceeds from long-term borrowings	0	150,000	0
Payments on long-term borrowings	(5,729)	(202,035)	(51,119)
Cash dividends paid – common stock	(22,228)	(20,936)	(13,662)
Repurchases of common stock	(4,036)	(31,868)	(10,000)
Proceeds from stock option exercises	0	0	129
Payment of taxes related to stock withheld	(786)	(307)	(702)
Net cash provided by financing activities	1,225,414	1,039,194	141,852
Increase (decrease) in Cash and Cash Equivalents	93,872	135,988	(231,596)
Cash and Cash Equivalents, Beginning of Year	367,290	231,302	462,898
Cash and Cash Equivalents, End of Year	461,162	367,290	231,302
Supplemental Disclosures of Cash Flow Information:
Cash paid during the period for interest	10,206	20,812	33,725
Cash paid during the period for income taxes	32,506	29,604	24,336
Non-cash:  Foreclosed loans transferred to foreclosed real estate	2,285	1,583	3,249
Non-cash:  Unrealized (loss) gain on securities available for sale, net of taxes	(41,400)	14,425	17,073
Non-cash:  Accrued dividends at period end	7,125	5,144	5,328
Non-cash: Initial recognition of operating lease right-of-use assets and liabilities	2,191	253	19,406
Non-cash: Derecognition of intangible assets related to sale of insurance operations	$ (10,229)	$ 0	$ 0