Parent Company Only Financial Statements Parent Company Only Financial Statements, Condensed Balance Sheet Statement (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets [Abstract]
Loan to bank subsidiary	$ 23,834,689	$ 23,627,845
Other assets	1,135,085	1,070,282
Total assets	49,685,892	49,824,830
Liabilities [Abstract]
Other liabilities	494,105	523,734
Subordinated debentures	131,200	131,150
Total liabilities	44,134,935	44,679,411
Shareholders' equity: [Abstract]
Common stock	5	5
Capital surplus	1,429,628	1,406,745
Retained earnings	5,592,100	5,211,512
Treasury Stock, Value	(970,340)	(876,720)
Accumulated other comprehensive loss	(503,040)	(599,100)	$ (836,955)	$ 72,371
Total shareholders’ equity	5,548,353	5,142,442
Total liabilities and shareholders’ equity	49,685,892	49,824,830
Parent Company [Member]
Assets [Abstract]
Cash and cash equivalents	276,046	203,808
Loan to bank subsidiary	65,131	65,151
Investment in bank subsidiary	5,130,141	4,785,453
Investment in non-bank subsidiaries	196,199	216,200
Other assets	19,486	17,984
Total assets	5,687,003	5,288,596
Liabilities [Abstract]
Other liabilities	7,450	15,004
Subordinated debentures	131,200	131,150
Total liabilities	138,650	146,154
Shareholders' equity: [Abstract]
Common stock	5	5
Capital surplus	1,429,628	1,406,745
Retained earnings	5,592,100	5,211,512
Treasury Stock, Value	(970,340)	(876,720)
Accumulated other comprehensive loss	(503,040)	(599,100)
Total shareholders’ equity	5,548,353	5,142,442
Total liabilities and shareholders’ equity	$ 5,687,003	$ 5,288,596