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Loans and Allowance for Loan Losses - Schedule Of Current, Accruing Past Due And Nonaccrual Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | $ 43,309,877 | $ 43,404,490
Non-accrual with an ALL | 298,857 | 216,667
Non-accrual without an ALL | 51,593 | 71,510
Accrued interest receivable | $ 248,000 | $ 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 | $ 22,731,296 | $ 22,598,493
Non-accrual with an ALL | 223,256 | 137,184
Non-accrual without an ALL | 49,655 | 44,056
Total commercial and industrial | Commercial, financial and agricultural |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 14,616,902 | 14,459,345
Non-accrual with an ALL | 173,435 | 66,400
Non-accrual without an ALL | 19,258 | 23,470
Total commercial and industrial | Owner-occupied |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 8,114,394 | 8,139,148
Non-accrual with an ALL | 49,821 | 70,784
Non-accrual without an ALL | 30,397 | 20,586
Total commercial real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 12,194,019 | 12,316,758
Non-accrual with an ALL | 13,606 | 16,205
Non-accrual without an ALL | 1,938 | 27,425
Total commercial real estate | Investment properties |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 11,310,881 | 11,363,304
Non-accrual with an ALL | 10,630 | 12,796
Non-accrual without an ALL | 1,596 | 26,974
Total commercial real estate | 1-4 family properties |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 580,138 | 598,502
Non-accrual with an ALL | 1,958 | 2,605
Non-accrual without an ALL | 342 | 451
Total commercial real estate | Land and development |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 303,000 | 354,952
Non-accrual with an ALL | 1,018 | 804
Non-accrual without an ALL | 0 | 0
Total consumer |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 8,384,562 | 8,489,239
Non-accrual with an ALL | 61,995 | 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 | 5,384,602 | 5,411,723
Non-accrual with an ALL | 42,563 | 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 | 1,804,348 | 1,807,399
Non-accrual with an ALL | 12,451 | 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 | 180,663 | 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 | 1,014,949 | 1,075,976
Non-accrual with an ALL | 6,981 | 6,697
Non-accrual without an ALL | 0 | 29
Current |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 42,904,613 | 43,057,214
Current | Total commercial and industrial |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 22,442,926 | 22,396,987
Current | Total commercial and industrial | Commercial, financial and agricultural |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 14,415,219 | 14,355,414
Current | Total commercial and industrial | Owner-occupied |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 8,027,707 | 8,041,573
Current | Total commercial real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 12,176,939 | 12,271,352
Current | Total commercial real estate | Investment properties |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 11,298,410 | 11,322,516
Current | Total commercial real estate | 1-4 family properties |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 576,878 | 595,359
Current | Total commercial real estate | Land and development |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 301,651 | 353,477
Current | Total consumer |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 8,284,748 | 8,388,875
Current | Total consumer | Consumer mortgages |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 5,333,982 | 5,359,153
Current | Total consumer | Home equity |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 1,778,768 | 1,785,836
Current | Total consumer | Credit cards |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 177,054 | 190,299
Current | Total consumer | Other consumer loans |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 994,944 | 1,053,587
Accruing 30-89 Days Past Due |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 51,066 | 54,046
Accruing 30-89 Days Past Due | Total commercial and industrial |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 13,635 | 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 | 7,323 | 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 | 6,312 | 6,056
Accruing 30-89 Days Past Due | Total commercial real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 1,516 | 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 | 245 | 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 | 940 | 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 | 331 | 671
Accruing 30-89 Days Past Due | Total consumer |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 35,915 | 34,228
Accruing 30-89 Days Past Due | Total consumer | Consumer mortgages |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 8,057 | 6,462
Accruing 30-89 Days Past Due | Total consumer | Home equity |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 13,129 | 10,374
Accruing 30-89 Days Past Due | Total consumer | Credit cards |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 1,705 | 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 | 13,024 | 15,574
Accruing 90 Days or Greater Past Due |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 3,748 | 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 | 1,824 | 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 | 1,667 | 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 | 157 | 149
Accruing 90 Days or Greater Past Due | Total commercial real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 20 | 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 | 0 | 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 | 20 | 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 | 1,904 | 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 | 0 | 716
Accruing 90 Days or Greater Past Due | Total consumer | Credit cards |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 1,904 | 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 | 0 | 89
Total Accruing Past Due |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 54,814 | 59,099
Total Accruing Past Due | Total commercial and industrial |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 15,459 | 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 | 8,990 | 14,061
Total Accruing Past Due | Total commercial and industrial | Owner-occupied |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 6,469 | 6,205
Total Accruing Past Due | Total commercial real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 1,536 | 1,776
Total Accruing Past Due | Total commercial real estate | Investment properties |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 245 | 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 | 960 | 87
Total Accruing Past Due | Total commercial real estate | Land and development |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 331 | 671
Total Accruing Past Due | Total consumer |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 37,819 | 37,057
Total Accruing Past Due | Total consumer | Consumer mortgages |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 8,057 | 6,462
Total Accruing Past Due | Total consumer | Home equity |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 13,129 | 11,090
Total Accruing Past Due | Total consumer | Credit cards |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 3,609 | 3,842
Total Accruing Past Due | Total consumer | Other consumer loans |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | $ 13,024 | $ 15,663

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