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Loans and Allowance for Loan Losses (Schedule of Current, Accruing Past Due and Nonaccrual Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | $ 42,571,458 | $ 39,311,958
Non-accrual with an ALL | 92,522 | 100,518
Non-accrual without an ALL | 29,572 | 30,524
Total commercial and industrial |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 21,212,516 | 19,622,924
Non-accrual with an ALL | 41,540 | 45,064
Non-accrual without an ALL | 26,168 | 27,919
Total commercial and industrial | Commercial, financial and agricultural |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 13,254,966 | 12,147,858
Non-accrual with an ALL | 33,712 | 37,918
Non-accrual without an ALL | 25,563 | 23,869
Total commercial and industrial | Owner-occupied |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 7,957,550 | 7,475,066
Non-accrual with an ALL | 7,828 | 7,146
Non-accrual without an ALL | 605 | 4,050
Total commercial real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 12,287,965 | 11,015,111
Non-accrual with an ALL | 6,396 | 9,726
Non-accrual without an ALL | 3,404 | 2,605
Total commercial real estate | Investment properties |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 11,238,404 | 9,902,776
Non-accrual with an ALL | 2,702 | 3,273
Non-accrual without an ALL | 2,339 | 2,577
Total commercial real estate | 1-4 family properties |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 639,627 | 645,469
Non-accrual with an ALL | 2,026 | 4,535
Non-accrual without an ALL | 1,065 | 28
Total commercial real estate | Land and development |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 409,934 | 466,866
Non-accrual with an ALL | 1,668 | 1,918
Non-accrual without an ALL | 0 | 0
Total consumer |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 9,070,977 | 8,673,923
Non-accrual with an ALL | 44,586 | 45,728
Non-accrual without an ALL | 0 | 0
Total consumer | Consumer mortgages |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 5,166,928 | 5,068,998
Non-accrual with an ALL | 32,527 | 29,078
Non-accrual without an ALL | 0 | 0
Total consumer | Home equity |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 1,708,246 | 1,361,419
Non-accrual with an ALL | 7,121 | 9,773
Non-accrual without an ALL | 0 | 0
Total consumer | Credit cards |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 197,978 | 204,172
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 | 1,997,825 | 2,039,334
Non-accrual with an ALL | 4,938 | 6,877
Non-accrual without an ALL | 0 | 0
Current |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 42,385,819 | 39,123,351
Current | Total commercial and industrial |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 21,124,274 | 19,528,924
Current | Total commercial and industrial | Commercial, financial and agricultural |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 13,180,498 | 12,068,740
Current | Total commercial and industrial | Owner-occupied |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 7,943,776 | 7,460,184
Current | Total commercial real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 12,276,250 | 10,998,504
Current | Total commercial real estate | Investment properties |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 11,232,942 | 9,894,924
Current | Total commercial real estate | 1-4 family properties |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 635,157 | 639,631
Current | Total commercial real estate | Land and development |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 408,151 | 463,949
Current | Total consumer |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 8,985,295 | 8,595,923
Current | Total consumer | Consumer mortgages |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 5,123,759 | 5,033,537
Current | Total consumer | Home equity |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 1,695,825 | 1,349,027
Current | Total consumer | Credit cards |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 194,860 | 201,929
Current | Total consumer | Other consumer loans |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 1,970,851 | 2,011,430
Accruing 30-89 Days Past Due |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 60,102 | 50,795
Accruing 30-89 Days Past Due | Total commercial and industrial |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 18,723 | 17,005
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 | 14,050 | 13,378
Accruing 30-89 Days Past Due | Total commercial and industrial | Owner-occupied |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 4,673 | 3,627
Accruing 30-89 Days Past Due | Total commercial real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 1,915 | 3,312
Accruing 30-89 Days Past Due | Total commercial real estate | Investment properties |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 421 | 1,285
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 | 1,379 | 1,182
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 | 115 | 845
Accruing 30-89 Days Past Due | Total consumer |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 39,464 | 30,478
Accruing 30-89 Days Past Due | Total consumer | Consumer mortgages |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 10,642 | 6,257
Accruing 30-89 Days Past Due | Total consumer | Home equity |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 5,225 | 2,619
Accruing 30-89 Days Past Due | Total consumer | Credit cards |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 1,561 | 1,233
Accruing 30-89 Days Past Due | Total consumer | Other consumer loans |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 22,036 | 20,369
Accruing 90 Days or Greater Past Due |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 3,443 | 6,770
Accruing 90 Days or Greater Past Due | Total commercial and industrial |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 1,811 | 4,012
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 | 1,143 | 3,953
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 | 668 | 59
Accruing 90 Days or Greater Past Due | Total commercial real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 0 | 964
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 | 717
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 | 93
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 | 154
Accruing 90 Days or Greater Past Due | Total consumer |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 1,632 | 1,794
Accruing 90 Days or Greater Past Due | Total consumer | Consumer mortgages |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 0 | 126
Accruing 90 Days or Greater Past Due | Total consumer | Home equity |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 75 | 0
Accruing 90 Days or Greater Past Due | Total consumer | Credit cards |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 1,557 | 1,010
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 | 658
Total Accruing Past Due |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 63,545 | 57,565
Total Accruing Past Due | Total commercial and industrial |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 20,534 | 21,017
Total Accruing Past Due | Total commercial and industrial | Commercial, financial and agricultural |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 15,193 | 17,331
Total Accruing Past Due | Total commercial and industrial | Owner-occupied |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 5,341 | 3,686
Total Accruing Past Due | Total commercial real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 1,915 | 4,276
Total Accruing Past Due | Total commercial real estate | Investment properties |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 421 | 2,002
Total Accruing Past Due | Total commercial real estate | 1-4 family properties |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 1,379 | 1,275
Total Accruing Past Due | Total commercial real estate | Land and development |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 115 | 999
Total Accruing Past Due | Total consumer |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 41,096 | 32,272
Total Accruing Past Due | Total consumer | Consumer mortgages |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 10,642 | 6,383
Total Accruing Past Due | Total consumer | Home equity |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 5,300 | 2,619
Total Accruing Past Due | Total consumer | Credit cards |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | 3,118 | 2,243
Total Accruing Past Due | Total consumer | Other consumer loans |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Loans, net of deferred fees and costs | $ 22,036 | $ 21,027

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