Loans and Allowance for Loan Losses - Schedule Of Current, Accruing Past Due And Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	$ 43,093,397	$ 43,404,490
Non-accrual with an ALL	195,882	216,667
Non-accrual without an ALL	60,224	71,510
Accrued interest receivable	$ 249,900	$ 256,300
Financing receivable, accrued interest, after allowance for credit loss, statement of financial position [extensible enumeration]	Other assets	Other assets
Total commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	$ 22,536,612	$ 22,598,493
Non-accrual with an ALL	112,606	137,184
Non-accrual without an ALL	58,478	44,056
Total commercial and industrial \| Commercial, financial and agricultural
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	14,519,608	14,459,345
Non-accrual with an ALL	82,602	66,400
Non-accrual without an ALL	37,505	23,470
Total commercial and industrial \| Owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	8,017,004	8,139,148
Non-accrual with an ALL	30,004	70,784
Non-accrual without an ALL	20,973	20,586
Total commercial and industrial \| Senior Housing Loans
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	3,020,000	3,280,000
Total commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	12,215,487	12,316,758
Non-accrual with an ALL	13,791	16,205
Non-accrual without an ALL	1,746	27,425
Total commercial real estate \| Investment properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	11,328,049	11,363,304
Non-accrual with an ALL	10,004	12,796
Non-accrual without an ALL	1,564	26,974
Total commercial real estate \| 1-4 family properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	552,547	598,502
Non-accrual with an ALL	2,878	2,605
Non-accrual without an ALL	182	451
Total commercial real estate \| Land and development
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	334,891	354,952
Non-accrual with an ALL	909	804
Non-accrual without an ALL	0	0
Total consumer
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	8,341,298	8,489,239
Non-accrual with an ALL	69,485	63,278
Non-accrual without an ALL	0	29
Total consumer \| Consumer mortgages
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	5,371,164	5,411,723
Non-accrual with an ALL	48,352	46,108
Non-accrual without an ALL	0	0
Total consumer \| Home equity
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,812,940	1,807,399
Non-accrual with an ALL	14,947	10,473
Non-accrual without an ALL	0	0
Total consumer \| Credit cards
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	178,889	194,141
Non-accrual with an ALL	0	0
Non-accrual without an ALL	0	0
Total consumer \| Other consumer loans
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	978,305	1,075,976
Non-accrual with an ALL	6,186	6,697
Non-accrual without an ALL	0	29
Current
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	42,707,532	43,057,214
Current \| Total commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	22,348,414	22,396,987
Current \| Total commercial and industrial \| Commercial, financial and agricultural
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	14,386,965	14,355,414
Current \| Total commercial and industrial \| Owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	7,961,449	8,041,573
Current \| Total commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	12,118,317	12,271,352
Current \| Total commercial real estate \| Investment properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	11,238,010	11,322,516
Current \| Total commercial real estate \| 1-4 family properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	548,220	595,359
Current \| Total commercial real estate \| Land and development
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	332,087	353,477
Current \| Total consumer
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	8,240,801	8,388,875
Current \| Total consumer \| Consumer mortgages
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	5,316,899	5,359,153
Current \| Total consumer \| Home equity
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,787,853	1,785,836
Current \| Total consumer \| Credit cards
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	175,418	190,299
Current \| Total consumer \| Other consumer loans
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	960,631	1,053,587
Accruing 30-89 Days Past Due
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	125,299	54,046
Accruing 30-89 Days Past Due \| Total commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	14,870	18,320
Accruing 30-89 Days Past Due \| Total commercial and industrial \| Commercial, financial and agricultural
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	10,292	12,264
Accruing 30-89 Days Past Due \| Total commercial and industrial \| Owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	4,578	6,056
Accruing 30-89 Days Past Due \| Total commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	81,277	1,498
Accruing 30-89 Days Past Due \| Total commercial real estate \| Investment properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	78,115	740
Accruing 30-89 Days Past Due \| Total commercial real estate \| 1-4 family properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,267	87
Accruing 30-89 Days Past Due \| Total commercial real estate \| Land and development
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,895	671
Accruing 30-89 Days Past Due \| Total consumer
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	29,152	34,228
Accruing 30-89 Days Past Due \| Total consumer \| Consumer mortgages
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	5,913	6,462
Accruing 30-89 Days Past Due \| Total consumer \| Home equity
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	10,107	10,374
Accruing 30-89 Days Past Due \| Total consumer \| Credit cards
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,665	1,818
Accruing 30-89 Days Past Due \| Total consumer \| Other consumer loans
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	11,467	15,574
Accruing 90 Days or Greater Past Due
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	4,460	5,053
Accruing 90 Days or Greater Past Due \| Total commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	2,244	1,946
Accruing 90 Days or Greater Past Due \| Total commercial and industrial \| Commercial, financial and agricultural
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	2,244	1,797
Accruing 90 Days or Greater Past Due \| Total commercial and industrial \| Owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	0	149
Accruing 90 Days or Greater Past Due \| Total commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	356	278
Accruing 90 Days or Greater Past Due \| Total commercial real estate \| Investment properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	356	278
Accruing 90 Days or Greater Past Due \| Total 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 \| Total 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 \| Total consumer
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,860	2,829
Accruing 90 Days or Greater Past Due \| Total consumer \| Consumer mortgages
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	0	0
Accruing 90 Days or Greater Past Due \| Total consumer \| Home equity
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	33	716
Accruing 90 Days or Greater Past Due \| Total consumer \| Credit cards
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,806	2,024
Accruing 90 Days or Greater Past Due \| Total consumer \| Other consumer loans
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	21	89
Total Accruing Past Due
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	129,759	59,099
Total Accruing Past Due \| Total commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	17,114	20,266
Total Accruing Past Due \| Total commercial and industrial \| Commercial, financial and agricultural
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	12,536	14,061
Total Accruing Past Due \| Total commercial and industrial \| Owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	4,578	6,205
Total Accruing Past Due \| Total commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	81,633	1,776
Total Accruing Past Due \| Total commercial real estate \| Investment properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	78,471	1,018
Total Accruing Past Due \| Total commercial real estate \| 1-4 family properties
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,267	87
Total Accruing Past Due \| Total commercial real estate \| Land and development
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	1,895	671
Total Accruing Past Due \| Total consumer
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	31,012	37,057
Total Accruing Past Due \| Total consumer \| Consumer mortgages
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	5,913	6,462
Total Accruing Past Due \| Total consumer \| Home equity
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	10,140	11,090
Total Accruing Past Due \| Total consumer \| Credit cards
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	3,471	3,842
Total Accruing Past Due \| Total consumer \| Other consumer loans
Financing Receivable, Nonaccrual [Line Items]
Loans, net of deferred fees and costs	$ 11,488	$ 15,663

Loans and Allowance for Loan Losses - Schedule Of Current, Accruing Past Due And Nonaccrual Loans (Details) - USD ($)
$ in Thousands

Jun. 30, 2024

Dec. 31, 2023

Financing Receivable, Nonaccrual [Line Items]

Loans, net of deferred fees and costs

$ 43,093,397

$ 43,404,490

Non-accrual with an ALL

195,882

216,667

Non-accrual without an ALL

60,224