CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Cash flows from operating activities:
Net income	$ 96,280	$ 146,551
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	10,794	11,515
Stock-based compensation	8,104	8,093
Provision for credit losses	45,200	14,437
Net accretion of discounts and amortization of premium on securities and borrowings	(779)	(397)
Amortization of other intangible assets	9,412	10,519
Losses on available for sale and held to maturity debt securities, net	7	24
Proceeds from sales of loans held for sale at fair value	41,650	27,743
Gains on sales of loans, net	(1,618)	(489)
Originations of loans held for sale	(37,581)	(26,588)
Gains on sales of assets, net	(3,694)	(124)
Net change in:
Fair value of financial instruments hedged by derivative transactions	3,540	4,219
Trading debt securities	(16)	6,583
Lease right of use assets	7,123	3,600
Cash surrender value of bank owned life insurance	(3,235)	(2,584)
Accrued interest receivable	(8,395)	(27,002)
Other assets	(184,680)	(298,077)
Accrued expenses and other liabilities	117,399	(147,705)
Net cash provided by (used in) operating activities	99,511	(269,682)
Cash flows from investing activities:
Net loan originations and purchases	(67,432)	(1,774,024)
Equity securities:
Purchases	(957)	(1,594)
Sales	408	409
Held to maturity debt securities:
Purchases	(39,639)	(79,961)
Maturities, calls and principal repayments	67,777	61,213
Available for sale debt securities:
Purchases	(183,924)	0
Maturities, calls and principal repayments	18,338	22,264
Death benefit proceeds from bank owned life insurance	3,620	2,773
Proceeds from sales of real estate property and equipment	2,850	125
Proceeds from sales of loans not originated for sale	196,523	0
Proceeds from sale of commercial premium finance lending division	98,060	0
Purchases of real estate property and equipment	(3,639)	(18,263)
Cash distribution from tax credit investments	0	2,500
Net cash provided by (used in) investing activities	91,985	(1,784,558)
Cash flows from financing activities:
Net change in deposits	(164,883)	(45,998)
Net change in short-term borrowings	(842,610)	6,274,327
Proceeds from issuance of long-term borrowings, net	1,000,000	1,000,000
Repayments of long-term borrowings	(65,000)	(350,000)
Cash dividends paid to preferred shareholders	(4,119)	(3,874)
Cash dividends paid to common shareholders	(57,944)	(57,612)
Purchase of common shares to treasury	(7,381)	(8,599)
Common stock issued, net	51	3,750
Other, net	(2)	(13)
Net cash (used in) provided by financing activities	(141,888)	6,811,981
Net change in cash and cash equivalents	49,608	4,757,741
Cash and cash equivalents at beginning of year	891,225	947,947	$ 947,947
Cash and cash equivalents at end of period	940,833	5,705,688	891,225
Supplemental disclosures of cash flow information:
Interest on deposits and borrowings	485,127	244,246
Federal and state income taxes	6,487	8,782
Supplemental schedule of non-cash investing activities:
Transfer of loans to other real estate owned	0	903
Transfer of loans to loans held for sale	34,143	0	$ 10,000
Lease right of use assets obtained in exchange for operating lease liabilities	$ 4,809	$ 7,461