CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Cash flows from operating activities:
Net income	$ 97,856	$ 96,280	$ 141,346	$ 146,551	$ 264,560	$ 426,957
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization					31,245	32,134
Stock-based compensation					22,995	25,365
Provision for credit losses	75,024		9,117		202,294	29,604
Net accretion of discounts and amortization of premium on securities and borrowings					(2,143)	(28)
Amortization of other intangible assets	8,692		9,741		26,672	30,072
Losses on available for sale and held to maturity debt securities, net					12	476
Proceeds from sales of loans held for sale at fair value					155,863	154,720
Losses (gains) on sales of loans, net	3,644		(2,023)		1,142	(3,752)
Originations of loans held for sale					(148,294)	(158,566)
Gains on sales of assets, net	(55)		(6,653)		(3,747)	(6,938)
Net change in:
Fair value of financial instruments hedged by derivative transactions					20,452	(916)
Trading debt securities					(23)	9,997
Lease right of use assets					8,421	(45,767)
Cash surrender value of bank owned life insurance					(13,167)	(7,736)
Accrued interest receivable					(4,633)	(41,180)
Other assets					(55,675)	(308,879)
Accrued expenses and other liabilities					(349,630)	521,214
Net cash provided by operating activities					156,344	656,777
Cash flows from investing activities:
Net loan originations and purchases					(408,268)	(3,235,439)
Equity securities:
Purchases					(8,295)	(12,745)
Sales					1,146	1,113
Held to maturity debt securities:
Purchases					(60,585)	(235,667)
Maturities, calls and principal repayments					224,349	262,734
Available for sale debt securities:
Purchases					(1,410,651)	(59,380)
Sales					0	17,910
Maturities, calls and principal repayments					154,021	63,060
Death benefit proceeds from bank owned life insurance					6,852	5,218
Proceeds from sales of real estate property and equipment					3,702	18,403
Proceeds from sales of loans not originated for sale					230,666	0
Proceeds from sale of commercial premium finance lending division					98,060	0
Purchases of real estate property and equipment					(9,724)	(71,571)
Net cash used in investing activities					(1,178,727)	(3,246,364)
Cash flows from financing activities:
Net change in deposits					1,144,039	2,248,400
Net change in short-term borrowings					(859,566)	(48,927)
Proceeds from issuance of long-term borrowings, net					1,001,800	1,250,000
Repayments of long-term borrowings					(65,000)	(475,000)
Proceeds from issuance of preferred stock, net					144,654	0
Cash dividends paid to preferred shareholders					(16,141)	(12,031)
Cash dividends paid to common shareholders					(170,321)	(169,488)
Purchase of common shares to treasury					(8,477)	(11,274)
Common stock issued, net					78	3,799
Other, net					(3)	(16)
Net cash provided by financing activities					1,171,063	2,785,463
Net change in cash and cash equivalents					148,680	195,876
Cash and cash equivalents at beginning of year		$ 891,225		$ 947,947	891,225	947,947	$ 947,947
Cash and cash equivalents at end of period	1,039,905		$ 1,143,823		1,039,905	1,143,823	891,225
Supplemental disclosures of cash flow information:
Interest on deposits and borrowings					1,348,751	942,237
Federal and state income taxes					82,712	172,835
Supplemental schedule of non-cash investing activities:
Transfer of loans to other real estate owned, net					7,172	974
Transfer of loans to loans held for sale, net	$ 823,100				823,091	10,000	$ 10,000
Lease right of use assets obtained in exchange for operating lease liabilities					$ 15,429	$ 81,727