Parent Company Only Financial Statements Parent Company Only Financial Statements, Condensed Cash Flow Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash Flows From Operating Activities: [Abstract]
Net income	$ 523,553	$ 531,133	$ 520,293
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]
Other gains, net	33,898	26,162	(846)
Change in other assets	106,972	89,930	13,205
Change in other liabilities	295,319	(79,733)	50,836
Net cash provided by operating activities	1,430,454	66,183	5,122,270
Cash Flows From Investing Activities: [Abstract]
Sale of subsidiary	0	32,601	0
Net cash provided by (used in) investing activities	(477,232)	(1,791,264)	(4,603,286)
Cash Flows From Financing Activities: [Abstract]
Issuance of common and treasury stock, net	(3,764)	(4,941)	(4,907)
Dividends paid	(142,981)	(143,398)	(143,800)
Repurchase of common stock	(89,856)	(176,819)	(154,887)
Net cash used in financing activities	(866,786)	1,671,630	(1,954,678)
Net increase (decrease) in cash and cash equivalents	86,436	(53,451)	(1,435,694)
Cash and cash equivalents at beginning of period	1,348,265	1,401,716	2,837,410
Cash and cash equivalents at end of period	1,434,701	1,348,265	1,401,716
Cash paid for interest	1,428,059	1,044,950	176,081
Parent Company [Member]
Cash Flows From Operating Activities: [Abstract]
Net income	523,569	530,746	520,273
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]
Equity in undistributed income of bank subsidiaries	(226,271)	(181,487)	(300,330)
Equity in undistributed income of non-bank subsidiaries	22,744	1,952	41,201
Other gains, net	(2,112)	(32,656)	4,279
Change in other assets	(963)	(1,986)	(1,317)
Change in other liabilities	(7,504)	13,404	543
Net cash provided by operating activities	311,389	333,945	267,283
Cash Flows From Investing Activities: [Abstract]
Investment in subsidiaries	(2,550)	(2,975)	(31,552)
Sale of subsidiary	0	(32,601)	0
Dissolution of subsidiaries	0	0	2,611
Net cash provided by (used in) investing activities	(2,550)	29,626	(28,941)
Cash Flows From Financing Activities: [Abstract]
Issuance of common and treasury stock, net	(3,764)	(4,941)	(4,907)
Dividends paid	(142,981)	(143,398)	(143,800)
Repurchase of common stock	(89,856)	(176,819)	(154,887)
Net cash used in financing activities	(236,601)	(325,158)	(303,594)
Net increase (decrease) in cash and cash equivalents	72,238	38,413	(65,252)
Cash and cash equivalents at beginning of period	203,808	165,395	230,647
Cash and cash equivalents at end of period	276,046	203,808	165,395
Cash paid for interest	$ 9,626	$ 8,479	$ 6,203