Loans and Allowance for Loan Losses - Schedule Of Current, Accruing Past Due And Nonaccrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	$ 43,404,490	$ 43,716,353
Non-accrual with an ALL	216,667	113,519
Non-accrual without an ALL	71,510	14,542
Accrued interest receivable	$ 256,300	$ 203,100
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Commercial & Industrial
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	$ 22,598,493	$ 22,066,656
Non-accrual with an ALL	137,184	57,507
Non-accrual without an ALL	44,056	11,904
Commercial & Industrial | Commercial, financial, and agricultural
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	14,459,345	13,874,416
Non-accrual with an ALL	66,400	48,008
Non-accrual without an ALL	23,470	11,299
Commercial & Industrial | Owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	8,139,148	8,192,240
Non-accrual with an ALL	70,784	9,499
Non-accrual without an ALL	20,586	605
Commercial Real Estate
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	12,316,758	12,650,313
Non-accrual with an ALL	16,205	5,115
Non-accrual without an ALL	27,425	2,638
Commercial Real Estate | Investment properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	11,363,304	11,644,047
Non-accrual with an ALL	12,796	1,785
Non-accrual without an ALL	26,974	1,688
Commercial Real Estate | 1-4 family properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	598,502	616,933
Non-accrual with an ALL	2,605	2,172
Non-accrual without an ALL	451	950
Commercial Real Estate | Land and development
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	354,952	389,333
Non-accrual with an ALL	804	1,158
Non-accrual without an ALL	0	0
Consumer
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	8,489,239	8,999,384
Non-accrual with an ALL	63,278	50,897
Non-accrual without an ALL	29	0
Consumer | Consumer mortgages
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	5,411,723	5,214,443
Non-accrual with an ALL	46,108	36,847
Non-accrual without an ALL	0	0
Consumer | Home equity
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,807,399	1,757,038
Non-accrual with an ALL	10,473	6,830
Non-accrual without an ALL	0	0
Consumer | Credit cards
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	194,141	203,612
Non-accrual with an ALL	0	0
Non-accrual without an ALL	0	0
Consumer | Other consumer loans
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,075,976	1,824,291
Non-accrual with an ALL	6,697	7,220
Non-accrual without an ALL	29	0
Current
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	43,057,214	43,522,724
Current | Commercial & Industrial
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	22,396,987	21,980,288
Current | Commercial & Industrial | Commercial, financial, and agricultural
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	14,355,414	13,798,639
Current | Commercial & Industrial | Owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	8,041,573	8,181,649
Current | Commercial Real Estate
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	12,271,352	12,640,761
Current | Commercial Real Estate | Investment properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	11,322,516	11,639,614
Current | Commercial Real Estate | 1-4 family properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	595,359	613,049
Current | Commercial Real Estate | Land and development
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	353,477	388,098
Current | Consumer
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	8,388,875	8,901,675
Current | Consumer | Consumer mortgages
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	5,359,153	5,163,417
Current | Consumer | Home equity
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,785,836	1,742,412
Current | Consumer | Credit cards
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	190,299	200,047
Current | Consumer | Other consumer loans
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,053,587	1,795,799
Accruing 30-89 Days Past Due
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	54,046	62,195
Accruing 30-89 Days Past Due | Commercial & Industrial
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	18,320	15,520
Accruing 30-89 Days Past Due | Commercial & Industrial | Commercial, financial, and agricultural
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	12,264	15,033
Accruing 30-89 Days Past Due | Commercial & Industrial | Owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	6,056	487
Accruing 30-89 Days Past Due | Commercial Real Estate
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,498	1,799
Accruing 30-89 Days Past Due | Commercial Real Estate | Investment properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	740	960
Accruing 30-89 Days Past Due | Commercial Real Estate | 1-4 family properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	87	762
Accruing 30-89 Days Past Due | Commercial Real Estate | Land and development
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	671	77
Accruing 30-89 Days Past Due | Consumer
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	34,228	44,876
Accruing 30-89 Days Past Due | Consumer | Consumer mortgages
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	6,462	13,969
Accruing 30-89 Days Past Due | Consumer | Home equity
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	10,374	7,795
Accruing 30-89 Days Past Due | Consumer | Credit cards
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,818	1,843
Accruing 30-89 Days Past Due | Consumer | Other consumer loans
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	15,574	21,269
Accruing 90 Days or Greater Past Due
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	5,053	3,373
Accruing 90 Days or Greater Past Due | Commercial & Industrial
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,946	1,437
Accruing 90 Days or Greater Past Due | Commercial & Industrial | Commercial, financial, and agricultural
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,797	1,437
Accruing 90 Days or Greater Past Due | Commercial & Industrial | Owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	149	0
Accruing 90 Days or Greater Past Due | Commercial Real Estate
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	278	0
Accruing 90 Days or Greater Past Due | Commercial Real Estate | Investment properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	278	0
Accruing 90 Days or Greater Past Due | Commercial Real Estate | 1-4 family properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	0	0
Accruing 90 Days or Greater Past Due | Commercial Real Estate | Land and development
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	0	0
Accruing 90 Days or Greater Past Due | Consumer
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	2,829	1,936
Accruing 90 Days or Greater Past Due | Consumer | Consumer mortgages
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	0	210
Accruing 90 Days or Greater Past Due | Consumer | Home equity
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	716	1
Accruing 90 Days or Greater Past Due | Consumer | Credit cards
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	2,024	1,722
Accruing 90 Days or Greater Past Due | Consumer | Other consumer loans
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	89	3
Total Accruing Past Due
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	59,099	65,568
Total Accruing Past Due | Commercial & Industrial
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	20,266	16,957
Total Accruing Past Due | Commercial & Industrial | Commercial, financial, and agricultural
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	14,061	16,470
Total Accruing Past Due | Commercial & Industrial | Owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	6,205	487
Total Accruing Past Due | Commercial Real Estate
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,776	1,799
Total Accruing Past Due | Commercial Real Estate | Investment properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,018	960
Total Accruing Past Due | Commercial Real Estate | 1-4 family properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	87	762
Total Accruing Past Due | Commercial Real Estate | Land and development
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	671	77
Total Accruing Past Due | Consumer
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	37,057	46,812
Total Accruing Past Due | Consumer | Consumer mortgages
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	6,462	14,179
Total Accruing Past Due | Consumer | Home equity
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	11,090	7,796
Total Accruing Past Due | Consumer | Credit cards
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	3,842	3,565
Total Accruing Past Due | Consumer | Other consumer loans
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	$ 15,663	$ 21,272