Parent Company Only Financial Statements Parent Company Only Financial Statements, Condensed Balance Sheet Statement (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets [Abstract]
Loan to bank subsidiary	$ 23,627,845	$ 22,321,446
Other assets	1,070,282	1,354,379
Total assets	49,824,830	47,790,642
Liabilities [Abstract]
Other liabilities	523,734	484,849
Subordinated debentures	131,150	131,205
Total liabilities	44,679,411	43,103,284
Shareholders' equity: [Abstract]
Common stock	5	5
Capital surplus	1,406,745	1,390,395
Retained earnings	5,211,512	4,824,164
Treasury Stock, Value	(876,720)	(694,960)
Accumulated other comprehensive income (loss)	(599,100)	(836,955)	$ 72,371	$ 335,868
Total shareholders’ equity	5,142,442	4,682,649
Total liabilities and shareholders’ equity	49,824,830	47,790,642
Parent Company [Member]
Assets [Abstract]
Cash and cash equivalents	203,808	165,395
Loan to bank subsidiary	65,151	65,169
Investment in bank subsidiary	4,785,453	4,351,280
Investment in non-bank subsidiaries	216,200	217,011
Other assets	17,984	18,302
Total assets	5,288,596	4,817,157
Liabilities [Abstract]
Other liabilities	15,004	3,303
Subordinated debentures	131,150	131,205
Total liabilities	146,154	134,508
Shareholders' equity: [Abstract]
Common stock	5	5
Capital surplus	1,406,745	1,390,395
Retained earnings	5,211,512	4,824,164
Treasury Stock, Value	(876,720)	(694,960)
Accumulated other comprehensive income (loss)	(599,100)	(836,955)
Total shareholders’ equity	5,142,442	4,682,649
Total liabilities and shareholders’ equity	$ 5,288,596	$ 4,817,157