Parent Company Condensed Financial Statements - Schedule of Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of cash flows
Net income	$ 1,165,586	$ 1,161,161	$ 1,128,083
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income tax expense (benefit)	(14,283)	(49,139)	(43,988)
Net change in other assets	63,743	(146,270)	187,512
Net change in other liabilities	(242,443)	105,304	461,385
Other operating activities, net	(3,755)	3,860	1,673
Net cash provided by operating activities	1,411,667	1,424,909	2,066,022
CASH FLOWS FROM INVESTING ACTIVITIES
Other investing activities, net	(14,704)	(112,036)	(8,454)
Net cash used in investing activities	(6,295,203)	(4,247,161)	(4,582,892)
Long-term debt:
Repayment of junior subordinated debt	(117,437)	(871)	(943)
Common stock:
Proceeds from issuance pursuant to various stock compensation plans and agreements	3,023	3,208	3,178
Stock tendered for payment of withholding taxes	(14,877)	(23,751)	(19,087)
Repurchase of common stock pursuant to the stock repurchase program	(143,082)	(82,174)	(99,990)
Cash dividends paid	(308,478)	(274,554)	(228,381)
Net cash provided by financing activities	5,527,526	3,962,454	2,114,210
Net (decrease) increase in cash and cash equivalents	635,758	1,133,200	(431,151)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	4,614,984	3,481,784	3,912,935
CASH AND CASH EQUIVALENTS, END OF YEAR	5,250,742	4,614,984	3,481,784
Parent Company
Statement of cash flows
Net income	1,165,586	1,161,161	1,128,083
Adjustments to reconcile net income to net cash provided by operating activities:
Undistributed earnings of subsidiaries, principally bank	(635,868)	(470,740)	(897,069)
Deferred income tax expense (benefit)	2,788	948	(2,193)
Net change in other assets	(6,912)	(4,160)	4,250
Net change in other liabilities	(802)	(47)	779
Other operating activities, net	1,265	2,443	1,333
Net cash provided by operating activities	526,057	689,605	235,183
CASH FLOWS FROM INVESTING ACTIVITIES
Redemption of trust preferred securities	3,558	0	0
Other investing activities, net	(494)	(95,095)	(7,390)
Net cash used in investing activities	3,064	(95,095)	(7,390)
Long-term debt:
Repayment of junior subordinated debt	(116,558)	0	0
Common stock:
Proceeds from issuance pursuant to various stock compensation plans and agreements	3,023	3,208	3,178
Stock tendered for payment of withholding taxes	(14,877)	(23,751)	(19,087)
Repurchase of common stock pursuant to the stock repurchase program	(143,082)	(82,174)	(99,990)
Cash dividends paid	(308,478)	(274,554)	(228,381)
Net cash provided by financing activities	(579,972)	(377,271)	(344,280)
Net (decrease) increase in cash and cash equivalents	(50,851)	217,239	(116,487)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	445,770	228,531	345,018
CASH AND CASH EQUIVALENTS, END OF YEAR	$ 394,919	$ 445,770	$ 228,531