Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
OPERATING ACTIVITIES
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 124,371	$ 118,154
INVESTING ACTIVITIES
Proceeds from sales of securities available for sale	93	1,689
Proceeds from maturities and calls of securities available for sale	416,317	184,059
Purchases of securities available for sale	(248,049)	(7,855)
Proceeds from sales of equity securities	289	98
Purchases of equity securities	(205)	(246)
Proceeds from sales and redemptions of other investment securities	46,739	21,547
Purchases of other investment securities	(52,379)	(52,217)
Purchases of bank premises and equipment	(4,772)	(3,447)
Proceeds from sales of bank premises and equipment	63	2,465
Proceeds from the sales of OREO properties	146	279
Net change in loans and leases	(160,675)	(54,938)
NET CASH (USED IN) PROVIDED BY INVESTING ACTIVITIES	(2,433)	91,434
FINANCING ACTIVITIES
Cash dividends paid	(50,137)	(48,651)
Acquisition of treasury stock	(1,030)	(1,374)
Proceeds from exercise of stock options	702	1,559
Redemption of subordinated debt	0	(10,250)
Repayment of long-term Federal Home Loan Bank borrowings	(1,500,000)	(1,900,000)
Proceeds from issuance of long-term Federal Home Loan Bank borrowings	1,450,000	2,500,000
Changes in:
Deposits	100,598	(18,227)
Federal funds purchased, securities sold under agreements to repurchase and other short-term borrowings	11,632	9,396
NET CASH PROVIDED BY FINANCING ACTIVITIES	11,765	532,453
Increase in cash and cash equivalents	133,703	742,041
Cash and cash equivalents at beginning of year	1,598,943	1,176,652
Cash and cash equivalents at end of period	1,732,646	1,918,693
Noncash investing activities:
Transfers of loans to OREO	119	2,919
Right-of-use assets obtained in the exchange for lease liabilities	$ 3,671	$ 10,192