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Loans And Allowance For Loan Losses - Schedule Of Current, Accruing Past Due And Nonaccrual Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | $ 39,311,958 | $ 38,252,984
Non-accrual with an ALL | 100,518 | 127,720
Non-accrual without an ALL | 30,524 | 23,359
Total | 39,311,958 | 38,252,984
Commercial and industrial |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Non-accrual with an ALL | 45,064 | 75,546
Non-accrual without an ALL | 27,919 | 21,859
Total | 19,561,161 | 19,520,168
Commercial and industrial | Commercial, financial, and agricultural |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Non-accrual with an ALL | 37,918 | 55,527
Non-accrual without an ALL | 23,869 | 21,859
Total | 12,052,475 | 12,410,152
Commercial and industrial | Owner-occupied |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Non-accrual with an ALL | 7,146 | 20,019
Non-accrual without an ALL | 4,050 | 0
Total | 7,508,686 | 7,110,016
Commercial real estate |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Non-accrual with an ALL | 9,726 | 28,913
Non-accrual without an ALL | 2,605 | 1,500
Total | 10,981,490 | 10,325,707
Commercial real estate | Investment properties |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Non-accrual with an ALL | 3,273 | 24,631
Non-accrual without an ALL | 2,577 | 0
Total | 9,869,155 | 9,103,379
Commercial real estate | 1-4 family properties |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Non-accrual with an ALL | 4,535 | 2,383
Non-accrual without an ALL | 28 | 1,236
Total | 645,469 | 628,695
Commercial real estate | Land and development |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Non-accrual with an ALL | 1,918 | 1,899
Non-accrual without an ALL | 0 | 264
Total | 466,866 | 593,633
Consumer |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Non-accrual with an ALL | 45,728 | 23,261
Non-accrual without an ALL | 0 | 0
Total | 8,769,307 | 8,407,109
Consumer | Consumer mortgages |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Non-accrual with an ALL | 29,078 | 8,740
Non-accrual without an ALL | 0 | 0
Total | 5,069,039 | 5,513,491
Consumer | Home equity lines |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Non-accrual with an ALL | 9,760 | 12,145
Non-accrual without an ALL | 0 | 0
Total | 1,281,989 | 1,537,726
Consumer | Credit cards |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Non-accrual with an ALL | 0 | 0
Non-accrual without an ALL | 0 | 0
Total | 299,556 | 281,018
Consumer | Other consumer loans |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Non-accrual with an ALL | 6,890 | 2,376
Non-accrual without an ALL | 0 | 0
Total | 2,118,723 | 1,074,874
Current |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 39,123,351 | 38,054,556
Current | Commercial and industrial |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 19,467,778 | 19,409,506
Current | Commercial and industrial | Commercial, financial, and agricultural |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 11,973,974 | 12,321,514
Current | Commercial and industrial | Owner-occupied |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 7,493,804 | 7,087,992
Current | Commercial real estate |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 10,964,883 | 10,288,383
Current | Commercial real estate | Investment properties |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 9,861,303 | 9,075,843
Current | Commercial real estate | 1-4 family properties |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 639,631 | 621,492
Current | Commercial real estate | Land and development |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 463,949 | 591,048
Current | Consumer |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 8,690,690 | 8,356,667
Current | Consumer | Consumer mortgages |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 5,033,579 | 5,495,415
Current | Consumer | Home equity lines |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 1,269,610 | 1,521,575
Current | Consumer | Credit cards |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 296,695 | 276,778
Current | Consumer | Other consumer loans |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 2,090,806 | 1,062,899
Accruing 30-89 Days Past Due |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 50,795 | 43,232
Accruing 30-89 Days Past Due | Commercial and industrial |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 16,655 | 12,169
Accruing 30-89 Days Past Due | Commercial and industrial | Commercial, financial, and agricultural |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 13,028 | 10,256
Accruing 30-89 Days Past Due | Commercial and industrial | Owner-occupied |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 3,627 | 1,913
Accruing 30-89 Days Past Due | Commercial real estate |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 3,312 | 6,721
Accruing 30-89 Days Past Due | Commercial real estate | Investment properties |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 1,285 | 2,751
Accruing 30-89 Days Past Due | Commercial real estate | 1-4 family properties |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 1,182 | 3,548
Accruing 30-89 Days Past Due | Commercial real estate | Land and development |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 845 | 422
Accruing 30-89 Days Past Due | Consumer |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 30,828 | 24,342
Accruing 30-89 Days Past Due | Consumer | Consumer mortgages |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 6,256 | 8,851
Accruing 30-89 Days Past Due | Consumer | Home equity lines |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 2,619 | 4,006
Accruing 30-89 Days Past Due | Consumer | Credit cards |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 1,584 | 2,363
Accruing 30-89 Days Past Due | Consumer | Other consumer loans |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 20,369 | 9,122
Accruing 90 Days or Greater Past Due |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 6,770 | 4,117
Accruing 90 Days or Greater Past Due | Commercial and industrial |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 3,745 | 1,088
Accruing 90 Days or Greater Past Due | Commercial and industrial | Commercial, financial, and agricultural |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 3,686 | 996
Accruing 90 Days or Greater Past Due | Commercial and industrial | Owner-occupied |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 59 | 92
Accruing 90 Days or Greater Past Due | Commercial real estate |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 964 | 190
Accruing 90 Days or Greater Past Due | Commercial real estate | Investment properties |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 717 | 154
Accruing 90 Days or Greater Past Due | Commercial real estate | 1-4 family properties |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 93 | 36
Accruing 90 Days or Greater Past Due | Commercial real estate | Land and development |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 154 | 0
Accruing 90 Days or Greater Past Due | Consumer |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 2,061 | 2,839
Accruing 90 Days or Greater Past Due | Consumer | Consumer mortgages |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 126 | 485
Accruing 90 Days or Greater Past Due | Consumer | Home equity lines |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 0 | 0
Accruing 90 Days or Greater Past Due | Consumer | Credit cards |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 1,277 | 1,877
Accruing 90 Days or Greater Past Due | Consumer | Other consumer loans |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 658 | 477
Total Accruing Past Due |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 57,565 | 47,349
Total Accruing Past Due | Commercial and industrial |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 20,400 | 13,257
Total Accruing Past Due | Commercial and industrial | Commercial, financial, and agricultural |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 16,714 | 11,252
Total Accruing Past Due | Commercial and industrial | Owner-occupied |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 3,686 | 2,005
Total Accruing Past Due | Commercial real estate |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 4,276 | 6,911
Total Accruing Past Due | Commercial real estate | Investment properties |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 2,002 | 2,905
Total Accruing Past Due | Commercial real estate | 1-4 family properties |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 1,275 | 3,584
Total Accruing Past Due | Commercial real estate | Land and development |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 999 | 422
Total Accruing Past Due | Consumer |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 32,889 | 27,181
Total Accruing Past Due | Consumer | Consumer mortgages |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 6,382 | 9,336
Total Accruing Past Due | Consumer | Home equity lines |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 2,619 | 4,006
Total Accruing Past Due | Consumer | Credit cards |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 2,861 | 4,240
Total Accruing Past Due | Consumer | Other consumer loans |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | $ 21,027 | $ 9,599

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