Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 341,999	$ 380,302
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	26,183	23,210
Provision for credit losses	42,151	(30,886)
Gain on other real estate and foreclosed assets	(375)	(5,210)
Loss on sale of securities		87
Deferred tax expense	3,266	9,396
Increase cash surrender value of life insurance contracts	(13,452)	(2,372)
Loss on disposal of assets	981	140
Net (increase) decrease in loans held for sale	(14,572)	54,010
Net amortization of securities premium/discount	14,233	29,475
Amortization of intangible assets	8,884	10,762
Stock-based compensation expense	18,677	17,507
Net change in derivative collateral liability	101,108	36,776
Net increase in interest payable and other liabilities	26,642	1,964
(Increase) decrease in other assets	(143,211)	174,915
Other, net	(10,111)	(24,999)
Net cash provided by operating activities	402,403	675,077
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from the sale of available for sale securities		73,219
Proceeds from maturities of securities available for sale	246,825	415,221
Purchases of securities available for sale	(40,047)	(517,178)
Proceeds from maturities of securities held to maturity	122,782	111,612
Purchases of securities held to maturity	(6,023)	(859,333)
Proceeds received upon termination of fair value hedge instruments	16,550	74,006
Net (increase) decrease in short-term investments	(493,889)	3,568,970
Net (purchases) redemption of Federal Home Loan Bank stock	(68,057)	4,969
Proceeds from sales of loans and leases	79,422	26,619
Net increase in loans	(978,775)	(1,545,537)
Purchase of life insurance contracts		(65,000)
Purchases of property and equipment	(24,572)	(22,352)
Proceeds from sales of other real estate and foreclosed assets	1,862	11,308
Other, net	(7,240)	2,778
Net cash provided by (used in) investing activities	(1,151,162)	1,279,302
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase (decrease) in deposits	1,249,988	(1,514,623)
Net decrease in short-term borrowings	(445,343)	(122,080)
Repayments of long-term debt		(480)
Dividends paid	(78,531)	(70,926)
Payroll tax remitted on net share settlement of equity awards	(3,321)	(1,891)
Proceeds from exercise of stock options		227
Proceeds from dividend reinvestment and stock purchase plans	2,858	2,671
Repurchase of common stock		(58,892)
Net cash provided by (used in) financing activities	725,651	(1,765,994)
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	(23,108)	188,385
CASH AND DUE FROM BANKS, BEGINNING	564,459	401,201
CASH AND DUE FROM BANKS, ENDING	541,351	589,586
SUPPLEMENTAL INFORMATION FOR NON-CASH INVESTING AND FINANCING ACTIVITIES
Assets acquired in settlement of loans	$ 4,067	$ 328