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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, 2022 | Dec. 31, 2021
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SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | $ 40,169,150 | $ 39,311,958
Non-accrual with an ALL | 103,624 | 100,518
Non-accrual without an ALL | 28,507 | 30,524
Total commercial and industrial |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 20,352,325 | 19,622,924
Non-accrual with an ALL | 49,603 | 45,064
Non-accrual without an ALL | 26,139 | 27,919
Total 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 | 12,659,611 | 12,147,858
Non-accrual with an ALL | 42,697 | 37,918
Non-accrual without an ALL | 22,191 | 23,869
Total commercial and industrial | Owner-occupied |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 7,692,714 | 7,475,066
Non-accrual with an ALL | 6,906 | 7,146
Non-accrual without an ALL | 3,948 | 4,050
Total commercial real estate |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 11,145,318 | 11,015,111
Non-accrual with an ALL | 9,218 | 9,726
Non-accrual without an ALL | 2,365 | 2,605
Total commercial real estate | Investment properties |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 10,047,145 | 9,902,776
Non-accrual with an ALL | 4,923 | 3,273
Non-accrual without an ALL | 2,365 | 2,577
Total 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 | 620,674 | 645,469
Non-accrual with an ALL | 2,242 | 4,535
Non-accrual without an ALL | 0 | 28
Total commercial real estate | Land and development |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 477,499 | 466,866
Non-accrual with an ALL | 2,053 | 1,918
Non-accrual without an ALL | 0 | 0
Total consumer |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 8,671,507 | 8,673,923
Non-accrual with an ALL | 44,803 | 45,728
Non-accrual without an ALL | 3 | 0
Total consumer | Consumer mortgages |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 5,052,003 | 5,068,998
Non-accrual with an ALL | 29,997 | 29,078
Non-accrual without an ALL | 0 | 0
Total consumer | Home equity |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 1,416,341 | 1,361,419
Non-accrual with an ALL | 8,851 | 9,773
Non-accrual without an ALL | 3 | 0
Total consumer | Credit cards |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 188,247 | 204,172
Non-accrual with an ALL | 0 | 0
Non-accrual without an ALL | 0 | 0
Total consumer | Other consumer loans |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 2,014,916 | 2,039,334
Non-accrual with an ALL | 5,955 | 6,877
Non-accrual without an ALL | 0 | 0
Current |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 39,991,634 | 39,123,351
Current | Total commercial and industrial |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 20,262,624 | 19,528,924
Current | Total 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 | 12,585,055 | 12,068,740
Current | Total commercial and industrial | Owner-occupied |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 7,677,569 | 7,460,184
Current | Total commercial real estate |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 11,129,038 | 10,998,504
Current | Total commercial real estate | Investment properties |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 10,037,457 | 9,894,924
Current | Total 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 | 616,706 | 639,631
Current | Total commercial real estate | Land and development |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 474,875 | 463,949
Current | Total consumer |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 8,599,972 | 8,595,923
Current | Total consumer | Consumer mortgages |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 5,017,739 | 5,033,537
Current | Total consumer | Home equity |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 1,404,435 | 1,349,027
Current | Total consumer | Credit cards |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 185,859 | 201,929
Current | Total consumer | Other consumer loans |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 1,991,939 | 2,011,430
Accruing 30-89 Days Past Due |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 42,318 | 50,795
Accruing 30-89 Days Past Due | Total commercial and industrial |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 13,589 | 17,005
Accruing 30-89 Days Past Due | Total 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 | 9,298 | 13,378
Accruing 30-89 Days Past Due | Total commercial and industrial | Owner-occupied |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 4,291 | 3,627
Accruing 30-89 Days Past Due | Total commercial real estate |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 3,926 | 3,312
Accruing 30-89 Days Past Due | Total commercial real estate | Investment properties |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 1,931 | 1,285
Accruing 30-89 Days Past Due | Total 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 | 1,424 | 1,182
Accruing 30-89 Days Past Due | Total commercial real estate | Land and development |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 571 | 845
Accruing 30-89 Days Past Due | Total consumer |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 24,803 | 30,478
Accruing 30-89 Days Past Due | Total consumer | Consumer mortgages |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 4,114 | 6,257
Accruing 30-89 Days Past Due | Total consumer | Home equity |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 3,052 | 2,619
Accruing 30-89 Days Past Due | Total consumer | Credit cards |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 1,174 | 1,233
Accruing 30-89 Days Past Due | Total consumer | Other consumer loans |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 16,463 | 20,369
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 | 3,067 | 6,770
Accruing 90 Days or Greater Past Due | Total commercial and industrial |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 370 | 4,012
Accruing 90 Days or Greater Past Due | Total 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 | 370 | 3,953
Accruing 90 Days or Greater Past Due | Total commercial and industrial | Owner-occupied |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 0 | 59
Accruing 90 Days or Greater Past Due | Total commercial real estate |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 771 | 964
Accruing 90 Days or Greater Past Due | Total commercial real estate | Investment properties |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 469 | 717
Accruing 90 Days or Greater Past Due | Total 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 | 302 | 93
Accruing 90 Days or Greater Past Due | Total commercial real estate | Land and development |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 0 | 154
Accruing 90 Days or Greater Past Due | Total consumer |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 1,926 | 1,794
Accruing 90 Days or Greater Past Due | Total consumer | Consumer mortgages |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 153 | 126
Accruing 90 Days or Greater Past Due | Total consumer | Home equity |  |
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 | Total consumer | Credit cards |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 1,214 | 1,010
Accruing 90 Days or Greater Past Due | Total consumer | Other consumer loans |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 559 | 658
Total Accruing Past Due |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 45,385 | 57,565
Total Accruing Past Due | Total commercial and industrial |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 13,959 | 21,017
Total Accruing Past Due | Total 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 | 9,668 | 17,331
Total Accruing Past Due | Total commercial and industrial | Owner-occupied |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 4,291 | 3,686
Total Accruing Past Due | Total commercial real estate |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 4,697 | 4,276
Total Accruing Past Due | Total commercial real estate | Investment properties |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 2,400 | 2,002
Total Accruing Past Due | Total 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 | 1,726 | 1,275
Total Accruing Past Due | Total commercial real estate | Land and development |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 571 | 999
Total Accruing Past Due | Total consumer |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 26,729 | 32,272
Total Accruing Past Due | Total consumer | Consumer mortgages |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 4,267 | 6,383
Total Accruing Past Due | Total consumer | Home equity |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 3,052 | 2,619
Total Accruing Past Due | Total consumer | Credit cards |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | 2,388 | 2,243
Total Accruing Past Due | Total consumer | Other consumer loans |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Loans, net of deferred fees and costs | $ 17,022 | $ 21,027

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