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	$ 568,851	$ 473,840	$ 390,606
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	72,709	54,934	57,615
Stock-based compensation	28,788	20,887	16,154
Provision for credit losses	56,817	32,633	125,722
Net amortization of premiums and accretion of discounts on securities and borrowings	10,653	30,251	38,315
Amortization of other intangible assets	37,825	21,827	24,645
Losses (gains) on securities transactions, net	1,230	(1,758)	(524)
Proceeds from sales of loans held for sale	389,666	1,180,912	1,019,841
Gains on sales of loans, net	(6,418)	(26,669)	(42,251)
Originations of loans held for sale	(267,158)	(1,003,818)	(1,211,227)
(Gains) losses on sales of assets, net	(897)	(901)	1,891
Loss on extinguishment of debt	0	8,406	12,036
Net deferred income tax expense (benefit)	7,485	26,827	(5,060)
Net change in:
Fair value of borrowings hedged by derivative transactions	(28,907)	(3,397)	0
Trading debt securities	24,692	(38,130)	0
Cash surrender value of bank owned life insurance	(8,040)	(8,817)	(10,083)
Accrued interest receivable	(74,007)	11,527	(593)
Other assets	(259,690)	122,241	(311,760)
Accrued expenses and other liabilities	874,880	(63,653)	58,234
Net cash provided by operating activities	1,428,479	837,142	163,561
Cash flows from investing activities:
Net loan originations and purchases	(6,868,735)	(1,036,949)	(2,490,937)
Equity securities:
Purchases	(11,209)	(4,051)	(8,337)
Sales	3,118	2,233	28,439
Held to maturity debt securities:
Purchases	(838,569)	(1,311,973)	(682,509)
Maturities, calls and principal repayments	475,327	802,167	824,477
Available for sale debt securities:
Purchases	(54,618)	(387,210)	(333,971)
Sales	12,846	91,978	30,020
Maturities, calls and principal repayments	225,942	462,273	555,589
Death benefit proceeds from bank owned life insurance	4,680	5,128	15,043
Proceeds from sales of real estate property and equipment	10,832	8,935	19,111
Proceeds from sales of loans held for investments	0	4,498	30,020
Purchases of real estate property and equipment	(68,935)	(39,428)	(24,607)
Cash and cash equivalents acquired in acquisitions, net	321,540	321,618	0
Net cash used in investing activities	(6,787,781)	(1,080,781)	(2,037,662)
Cash flows from financing activities:
Net change in deposits	4,974,505	2,534,826	2,749,765
Net change in short-term borrowings	(620,791)	(492,232)	54,678
Proceeds from issuance of long-term borrowings, net	147,508	295,922	838,388
Repayments of long-term borrowings	0	(1,168,465)	(679,775)
Cash dividends paid to preferred shareholders	(13,146)	(12,688)	(12,688)
Cash dividends paid to common shareholders	(205,999)	(179,667)	(177,965)
Purchase of common shares to treasury	(24,123)	(23,907)	(5,374)
Common stock issued, net	120	11,245	2,202
Other, net	(745)	(680)	(612)
Net cash provided by financing activities	4,257,329	964,354	2,768,619
Net change in cash and cash equivalents	(1,101,973)	720,715	894,518
Cash and cash equivalents at beginning of year	2,049,920	1,329,205	434,687
Cash and cash equivalents at end of year	947,947	2,049,920	1,329,205
Supplemental disclosures of cash flow information:
Interest on deposits and borrowings	281,137	138,364	279,042
Federal and state income taxes	172,102	163,370	148,383
Supplemental schedule of non-cash investing activities:
Transfer of loans to other real estate owned	0	141	4,040
Loans transferred to loans held for sale	0	0	30,020
Lease right of use assets obtained in exchange for operating lease liabilities	32,604	48,453	16,062
Non-cash assets acquired:
Equity securities	6,239	0	0
Available for sale debt securities	505,928	0	0
Held to maturity debt securities	806,627	9,197	0
Loans, net	5,844,070	908,023	0
Premises and equipment	38,827	1,356	0
Lease right of use assets	49,434	6,745	0
Bank owned life insurance	126,861	28,756	0
Accrued interest receivable	25,717	2,179	0
Goodwill	409,928	76,566	0
Other intangible assets	159,587	10,277	0
Other assets	155,945	23,093	0
Total non-cash assets acquired	8,129,163	1,066,192	0
Liabilities assumed:
Deposits	7,029,997	1,161,984	0
Short-term borrowings	103,794	0	0
Lease liabilities	79,844	0	0
Accrued expenses and other liabilities	119,240	14,692	0
Total liabilities assumed	7,332,875	1,176,676	0
Net (liabilities assumed) non-cash assets acquired	796,288	(110,484)	0
Cash and cash equivalents acquired in acquisitions, net	321,540	321,618	0
Common stock issued in acquisition	$ 1,117,829	$ 211,134	$ 0