Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 108,612	$ 126,467
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,176	8,565
Provision for credit losses	12,968	6,020
Gain on other real estate and foreclosed assets	(364)	(20)
Deferred tax benefit	(2,314)	(801)
Increase cash surrender value of life insurance contracts	(8,851)	(2,995)
(Gain) Loss on disposal of assets	(1,430)	30
Net decrease in loans held for sale	9,633	3,028
Net amortization of securities premium/discount	3,421	5,103
Amortization of intangible assets	2,526	3,114
Stock-based compensation expense	5,691	5,726
Net change in derivative collateral liability	10,297	76,152
Net decrease in interest payable and other liabilities	(21,324)	(28,313)
(Increase) decrease in other assets	40,643	(112,916)
Other, net	(1,013)	(3,272)
Net cash provided by operating activities	166,671	85,888
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities of securities available for sale	82,667	77,339
Purchases of securities available for sale	(121,652)	0
Proceeds from maturities of securities held to maturity	28,414	30,900
Purchases of securities held to maturity	0	(6,023)
Proceeds received upon termination of fair value hedge instruments	0	16,550
Net (increase) decrease in short-term investments	188,063	(1,964,089)
Net purchases of Federal Home Loan Bank stock	0	(68,057)
Proceeds from sales of loans and leases	28,508	11,006
Net increase in loans	(86,295)	(306,873)
Purchases of property and equipment	(2,273)	(5,498)
Proceeds from sales of other real estate and foreclosed assets	1,753	235
Other, net	618	(4,252)
Net cash provided by (used in) investing activities	119,803	(2,218,762)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposits	85,847	542,721
Net increase (decrease) in short-term borrowings	(487,069)	1,648,226
Dividends paid	(26,514)	(26,173)
Payroll tax remitted on net share settlement of equity awards	(6,557)	(2,922)
Proceeds from dividend reinvestment and stock purchase plans	897	935
Net cash provided by (used in) financing activities	(433,396)	2,162,787
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	(146,922)	29,913
CASH AND DUE FROM BANKS, BEGINNING	561,202	564,459
CASH AND DUE FROM BANKS, ENDING	414,280	594,372
SUPPLEMENTAL INFORMATION FOR NON-CASH INVESTING AND FINANCING ACTIVITIES
Assets acquired in settlement of loans	$ 591	$ 202