CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Cash flows from operating activities:
Net income	$ 70,424	$ 96,280	$ 139,060	$ 146,551	$ 166,704	$ 285,611
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization					21,510	21,425
Stock-based compensation					15,718	16,773
Provision for credit losses	82,070		6,050		127,270	20,487
Net accretion of discounts and amortization of premium on securities and borrowings					(1,418)	(639)
Amortization of other intangible assets	8,568		9,812		17,980	20,331
Losses on available for sale and held to maturity debt securities, net					11	33
Proceeds from sales of loans held for sale at fair value					145,310	72,925
Gains on sales of loans, net	(884)		(1,240)		(2,502)	(1,729)
Originations of loans held for sale					(133,348)	(76,943)
Gains on sales of assets, net	2		(161)		(3,692)	(285)
Net change in:
Fair value of financial instruments hedged by derivative transactions					6,083	(291)
Trading debt securities					(6)	10,029
Lease right of use assets					5,506	(53,412)
Cash surrender value of bank owned life insurance					(7,748)	(5,722)
Accrued interest receivable					(5,669)	(29,312)
Other assets					(176,362)	(230,018)
Accrued expenses and other liabilities					138,165	233,419
Net cash provided by operating activities					313,512	282,682
Cash flows from investing activities:
Net loan originations and purchases					(496,413)	(3,009,649)
Equity securities:
Purchases					(4,691)	(9,662)
Sales					751	771
Held to maturity debt securities:
Purchases					(56,672)	(114,544)
Maturities, calls and principal repayments					144,552	175,492
Available for sale debt securities:
Purchases					(982,861)	(41,470)
Sales					0	17,910
Maturities, calls and principal repayments					49,102	44,534
Death benefit proceeds from bank owned life insurance					5,667	5,218
Proceeds from sales of real estate property and equipment					2,974	490
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					(6,378)	(49,468)
Net cash used in investing activities					(1,015,243)	(2,980,378)
Cash flows from financing activities:
Net change in deposits					869,348	1,982,901
Net change in short-term borrowings					(854,064)	950,170
Proceeds from issuance of long-term borrowings, net					1,000,000	1,250,000
Repayments of long-term borrowings					(65,000)	(350,000)
Cash dividends paid to preferred shareholders					(8,227)	(7,904)
Cash dividends paid to common shareholders					(114,256)	(113,611)
Purchase of common shares to treasury					(8,271)	(11,133)
Common stock issued, net					51	3,750
Other, net					(2)	(15)
Net cash provided by financing activities					819,579	3,704,158
Net change in cash and cash equivalents					117,848	1,006,462
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	$ 1,009,073		$ 1,954,409		1,009,073	1,954,409	891,225
Supplemental disclosures of cash flow information:
Interest on deposits and borrowings					891,336	571,741
Federal and state income taxes					48,252	122,130
Supplemental schedule of non-cash investing activities:
Transfer of loans to other real estate owned					8,059	903
Transfer of loans to loans held for sale					0	10,000	$ 10,000
Lease right of use assets obtained in exchange for operating lease liabilities					$ 15,429	$ 81,727