Parent Company Only Financial Statements Parent Company Only Financial Statements, Condensed Cash Flow Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flows From Operating Activities: [Abstract]
Net income	$ 531,133	$ 520,293	$ 616,325
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]
Other gains, net	26,162	(846)	67,446
Change in other assets	89,930	13,205	(12,568)
Change in other liabilities	(79,733)	50,836	12,897
Net cash provided by operating activities	66,183	5,122,270	(3,692,577)
Cash Flows From Investing Activities: [Abstract]
Sale of subsidiary	32,601	0	0
Net cash provided by (used in) investing activities	(1,791,264)	(4,603,286)	2,602,672
Cash Flows From Financing Activities: [Abstract]
Repayment of subordinated debentures	0	0	150,000
Issuance of common and treasury stock, net	(4,941)	(4,907)	(4,874)
Dividends paid	(143,398)	(143,800)	(144,105)
Repurchase of common stock	(176,819)	(154,887)	(117,938)
Net cash used in financing activities	1,671,630	(1,954,678)	2,746,742
Net increase (decrease) in cash and cash equivalents	(53,451)	(1,435,694)	1,656,837
Cash and cash equivalents at beginning of period	1,401,716	2,837,410	1,180,573
Cash and cash equivalents at end of period	1,348,265	1,401,716	2,837,410
Cash paid for interest	1,044,950	176,081	68,775
Parent Company [Member]
Cash Flows From Operating Activities: [Abstract]
Net income	530,746	520,273	618,121
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]
Equity in undistributed income of bank subsidiaries	(181,487)	(300,330)	(126,380)
Equity in undistributed income of non-bank subsidiaries	1,952	41,201	(11,738)
Other gains, net	(32,656)	4,279	3,415
Change in other assets	(1,986)	(1,317)	(1,160)
Change in other liabilities	13,404	543	389
Net cash provided by operating activities	333,945	267,283	484,967
Cash Flows From Investing Activities: [Abstract]
Investment in subsidiaries	(2,975)	(31,552)	(25,665)
Sale of subsidiary	(32,601)	0	0
Dissolution of subsidiaries	0	2,611	4,457
Net cash provided by (used in) investing activities	29,626	(28,941)	(21,208)
Cash Flows From Financing Activities: [Abstract]
Repayment of subordinated debentures	0	0	(150,000)
Issuance of common and treasury stock, net	(4,941)	(4,907)	(4,874)
Dividends paid	(143,398)	(143,800)	(144,105)
Repurchase of common stock	(176,819)	(154,887)	(117,938)
Net cash used in financing activities	(325,158)	(303,594)	(416,917)
Net increase (decrease) in cash and cash equivalents	38,413	(65,252)	46,842
Cash and cash equivalents at beginning of period	165,395	230,647	183,805
Cash and cash equivalents at end of period	203,808	165,395	230,647
Cash paid for interest	$ 8,479	$ 6,203	$ 10,559