CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net income	$ 158,802	$ 30,852	$ 283,743
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	11,746	13,845	14,752
Provision for credit losses	4,789	10,129	4,832
Share-based compensation expense	21,717	19,390	18,925
Loss on sale and disposal of premises and equipment	12	619	89
Loss (gain) on sale of or write down of other real estate owned	28	(82)	0
Net (accretion) amortization of discounts/premium on securities	(11,848)	12,827	18,618
Net (accretion) of discounts/premiums for acquired loans and deferred loan fees/costs	(12,501)	(15,298)	(27,310)
Loss (gain) on sale of investment securities available-for-sale	0	253,927	(1,710)
(Gain) on debt extinguishment	(5,270)	(793)	0
(Gain) on sales of loans	(205)	(415)	(3,238)
Deferred income tax expense	3,783	3,962	5,899
Income from bank owned life insurance, net	(14,235)	(11,440)	(10,658)
Amortization of intangible assets	11,091	12,303	13,983
Originations of loans held for sale, net of principal payments received	(5,337)	(1,386)	(61,237)
Proceeds from the sales of loans held for sale	4,011	2,085	73,300
Net change in accrued expenses and other liabilities	(29,812)	21,204	6,512
Net change in accrued interest receivable and other assets	89,688	(100,749)	74,532
Net cash provided by operating activities	226,459	250,980	411,032
Cash flows from investing activities:
Net change in interest-bearing time deposits with financial institutions	(251)	739	482
Proceeds from sales of other real estate owned	209	3,835	0
Loan payments and (originations), net	1,708,176	1,298,976	(431,181)
Proceeds from sales of loans previously classified as loans held for investment	63,692	116,932	5,800
Purchase of loans held for investment	(517,379)	0	(797)
Purchase of securities held-to-maturity	(25,051)	(23,267)	0
Proceeds from prepayments and maturities of securities held-to-maturity	48,272	47,413	20,115
Purchase of securities available-for-sale	(1,406,127)	(761,586)	(986,997)
Proceeds from prepayments and maturities of securities available-for-sale	902,685	253,185	326,980
Proceeds from sales of securities available-for-sale	0	1,568,604	936,413
Proceeds from the sales of premises and equipment	2	12	0
Proceeds from surrender of bank owned life insurance	463	272	0
Purchases of premises and equipment	(3,664)	(6,609)	(7,476)
Net change in FHLB, FRB, and other stock	1,711	7,926	(10,571)
Funding of Community Reinvestment Act (“CRA”) investments, net	(8,510)	(34,534)	(12,861)
Net cash provided by (used in) investing activities	764,228	2,471,898	(160,093)
Cash flows from financing activities:
Net change in deposit accounts	(531,924)	(2,356,775)	236,812
Net change in short-term borrowings	0	(200,000)	(358,000)
Proceeds from long-term borrowings	0	0	800,000
Repayment of long-term borrowings	(594,730)	(199,207)	0
Repayments of subordinated debentures	(60,000)	0	0
Cash dividends paid	(127,108)	(126,265)	(125,160)
Proceeds from exercise of stock options	908	966	873
Restricted stock surrendered and canceled	(4,976)	(6,373)	(8,918)
Net cash (used in) provided by financing activities	(1,317,830)	(2,887,654)	545,607
Net change in cash and cash equivalents	(327,143)	(164,776)	796,546
Cash and cash equivalents, beginning of year	936,473	1,101,249	304,703
Cash and cash equivalents, end of year	609,330	936,473	1,101,249
Supplemental cash flow disclosures:
Interest paid	292,696	258,938	59,149
Income taxes (refunded) paid, net	(12,229)	53,135	75,294
Noncash investing activities during the period:
Transfers from loans held for investment to loans held for sale	64,476	117,441	6,399
Loans held for sale transfer to loans held for investment	0	2,868	0
Other real estate owned transferred from loans held for investment	0	7,590	0
Transfers of investment securities from available-for-sale to held-to-maturity	0	360,347	1,019,472
Transfer of CRA investment securities from FHLB, FRB, and other stock to other assets	0	12,601	0
Transfer of investment securities from FHLB, FRB, and other to held-to-maturity	0	0	7,000
Recognition of operating lease right-of-use assets	(22,109)	(7,360)	(1,635)
Recognition of operating lease liabilities	$ 23,663	$ 7,437	$ 1,635