Parent Company Only Financial Statements Parent Company Only Financial Statements, Condensed Cash Flow Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows From Operating Activities: [Abstract]
Net income	$ 520,293	$ 616,325	$ 435,071
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]
Other gains, net	(846)	67,446	15,949
Change in other assets	13,205	(12,568)	1,739
Change in other liabilities	50,836	12,897	8,895
Net cash provided by operating activities	5,122,270	(3,692,577)	(416,256)
Cash Flows From Investing Activities: [Abstract]
Net cash used in investing activities	(4,603,286)	2,602,672	(2,458,835)
Cash Flows From Financing Activities: [Abstract]
Repayment of subordinated debentures	0	150,000	0
Issuance of common and treasury stock, net	(4,907)	(4,874)	(4,933)
Dividends paid	(143,800)	(144,105)	(144,437)
Repurchase of common stock	(154,887)	(117,938)	(75,830)
Net cash used in financing activities	(1,954,678)	2,746,742	2,796,843
Net increase (decrease) in cash and cash equivalents	(1,435,694)	1,656,837	(78,248)
Cash and cash equivalents at beginning of period	2,837,410	1,180,573	1,258,821
Cash and cash equivalents at end of period	1,401,716	2,837,410	1,180,573
Cash paid for interest	176,081	68,775	160,288
Parent Company [Member]
Cash Flows From Operating Activities: [Abstract]
Net income	520,273	618,121	435,030
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]
Equity in undistributed income of bank subsidiaries	(300,330)	(126,380)	(276,217)
Equity in undistributed income of non-bank subsidiaries	41,201	(11,738)	35,610
Other gains, net	4,279	3,415	(1,465)
Change in other assets	(1,317)	(1,160)	(15,225)
Change in other liabilities	543	389	850
Net cash provided by operating activities	267,283	484,967	209,033
Cash Flows From Investing Activities: [Abstract]
Investment in subsidiaries	(31,552)	(25,665)	(14,807)
Dissolution of subsidiaries	2,611	4,457	0
Net cash used in investing activities	(28,941)	(21,208)	(14,807)
Cash Flows From Financing Activities: [Abstract]
Repayment of subordinated debentures	0	(150,000)	0
Issuance of common and treasury stock, net	(4,907)	(4,874)	(4,933)
Dividends paid	(143,800)	(144,105)	(144,437)
Repurchase of common stock	(154,887)	(117,938)	(75,830)
Net cash used in financing activities	(303,594)	(416,917)	(225,200)
Net increase (decrease) in cash and cash equivalents	(65,252)	46,842	(30,974)
Cash and cash equivalents at beginning of period	230,647	183,805	214,779
Cash and cash equivalents at end of period	165,395	230,647	183,805
Cash paid for interest	$ 6,203	$ 10,559	$ 14,064