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Loans - Accruing And Non-Accruing Loans By Class (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | $ 33,125,848 |  | $ 30,841,035 |  |  |
Total Accruing | 33,188,490 |  | 30,898,946 |  |  |
Current, Non-Accruing | 126,237 |  | 100,382 |  |  |
Total Non-Accruing | 189,813 |  | 162,165 |  |  |
Total loans, net of unearned income | 33,378,303 | [1] | 31,061,111 | [1] | $ 27,990,048 |
Allowance for loan losses | 444,490 |  | 200,307 |  | 184,911 | $ 180,424
30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 48,498 |  | 36,052 |  |  |
Past Due, Non-Accruing | 9,354 |  | 20,217 |  |  |
90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 14,144 |  | 21,859 |  |  |
Past Due, Non-Accruing | 54,222 |  | 41,566 |  |  |
Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses |  |  | 158,598 |  |  |
Commercial | Commercial, financial, and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 22,011,134 |  | 19,967,302 |  |  |
Total Accruing | 22,028,349 |  | 19,976,779 |  |  |
Current, Non-Accruing | 60,387 |  | 36,564 |  |  |
Total Non-Accruing | 96,081 |  | 74,312 |  |  |
Total loans, net of unearned income | 22,124,430 |  | 20,051,091 |  | 17,176,112 |
Allowance for loan losses | 254,516 |  | 122,486 |  | 103,713 | 98,947
Commercial | Commercial, financial, and industrial | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 17,049 |  | 7,442 |  |  |
Past Due, Non-Accruing | 2,505 |  | 14,385 |  |  |
Commercial | Commercial, financial, and industrial | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 166 |  | 2,035 |  |  |
Past Due, Non-Accruing | 33,189 |  | 23,363 |  |  |
Commercial | Commercial, financial, and industrial | C&I |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 16,081,865 |  | 15,314,292 |  |  |
Total Accruing | 16,099,080 |  | 15,321,684 |  |  |
Current, Non-Accruing | 60,387 |  | 36,564 |  |  |
Total Non-Accruing | 96,081 |  | 74,312 |  |  |
Total loans, net of unearned income | 16,195,161 |  | 15,395,996 |  |  |
Nonaccrual, no allowance | 36,100 |  |  |  |  |
Commercial | Commercial, financial, and industrial | C&I | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 17,049 |  | 7,155 |  |  |
Past Due, Non-Accruing | 2,505 |  | 14,385 |  |  |
Commercial | Commercial, financial, and industrial | C&I | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 166 |  | 237 |  |  |
Past Due, Non-Accruing | 33,189 |  | 23,363 |  |  |
Commercial | Commercial, financial, and industrial | Loans to Mortgage Companies |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 5,713,914 |  | 4,410,883 |  |  |
Total Accruing | 5,713,914 |  | 4,410,883 |  |  |
Current, Non-Accruing | 0 |  | 0 |  |  |
Total Non-Accruing | 0 |  | 0 |  |  |
Total loans, net of unearned income | 5,713,914 |  | 4,410,883 |  |  |
Commercial | Commercial, financial, and industrial | Loans to Mortgage Companies | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 0 |  | 0 |  |  |
Past Due, Non-Accruing | 0 |  | 0 |  |  |
Commercial | Commercial, financial, and industrial | Loans to Mortgage Companies | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 0 |  | 0 |  |  |
Past Due, Non-Accruing | 0 |  | 0 |  |  |
Commercial | Commercial, financial, and industrial | TRUPS |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 215,355 |  | 218,287 |  |  |
Total Accruing | 215,355 |  | 218,287 |  |  |
Current, Non-Accruing | 0 |  | 0 |  |  |
Total Non-Accruing | 0 |  | 0 |  |  |
Total loans, net of unearned income | 215,355 |  | 218,287 |  |  |
Allowance for loan losses | 18,900 |  | 19,100 |  |  |
Commercial | Commercial, financial, and industrial | TRUPS | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 0 |  | 0 |  |  |
Past Due, Non-Accruing | 0 |  | 0 |  |  |
Commercial | Commercial, financial, and industrial | TRUPS | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 0 |  | 0 |  |  |
Past Due, Non-Accruing | 0 |  | 0 |  |  |
Commercial | Commercial, financial, and industrial | C&I Purchase Credit Impaired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing |  |  | 23,840 |  |  |
Total Accruing |  |  | 25,925 |  |  |
Current, Non-Accruing |  |  | 0 |  |  |
Total Non-Accruing |  |  | 0 |  |  |
Total loans, net of unearned income |  |  | 25,925 |  |  |
Commercial | Commercial, financial, and industrial | C&I Purchase Credit Impaired Loans | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing |  |  | 287 |  |  |
Past Due, Non-Accruing |  |  | 0 |  |  |
Commercial | Commercial, financial, and industrial | C&I Purchase Credit Impaired Loans | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing |  |  | 1,798 |  |  |
Past Due, Non-Accruing |  |  | 0 |  |  |
Commercial | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 4,637,044 |  | 4,334,283 |  |  |
Total Accruing | 4,637,502 |  | 4,335,192 |  |  |
Current, Non-Accruing | 29 |  | 0 |  |  |
Total Non-Accruing | 2,190 |  | 1,825 |  |  |
Total loans, net of unearned income | 4,639,692 |  | 4,337,017 |  | 3,946,943 |
Allowance for loan losses | 47,625 |  | 36,112 |  | 34,382 | 31,311
Commercial | Commercial real estate | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 458 |  | 814 |  |  |
Past Due, Non-Accruing | 844 |  | 485 |  |  |
Commercial | Commercial real estate | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 0 |  | 95 |  |  |
Past Due, Non-Accruing | 1,317 |  | 1,340 |  |  |
Commercial | Commercial real estate | Income CRE |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 4,562,822 |  | 4,242,044 |  |  |
Total Accruing | 4,563,241 |  | 4,242,723 |  |  |
Current, Non-Accruing | 29 |  | 0 |  |  |
Total Non-Accruing | 2,162 |  | 1,359 |  |  |
Total loans, net of unearned income | 4,565,403 |  | 4,244,082 |  |  |
Commercial | Commercial real estate | Income CRE | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 419 |  | 679 |  |  |
Past Due, Non-Accruing | 816 |  | 19 |  |  |
Commercial | Commercial real estate | Income CRE | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 0 |  | 0 |  |  |
Past Due, Non-Accruing | 1,317 |  | 1,340 |  |  |
Commercial | Commercial real estate | Residential CRE |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 74,222 |  | 87,487 |  |  |
Total Accruing | 74,261 |  | 87,494 |  |  |
Current, Non-Accruing | 0 |  | 0 |  |  |
Total Non-Accruing | 28 |  | 466 |  |  |
Total loans, net of unearned income | 74,289 |  | 87,960 |  |  |
Commercial | Commercial real estate | Residential CRE | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 39 |  | 7 |  |  |
Past Due, Non-Accruing | 28 |  | 466 |  |  |
Commercial | Commercial real estate | Residential CRE | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 0 |  | 0 |  |  |
Past Due, Non-Accruing | 0 |  | 0 |  |  |
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing |  |  | 4,752 |  |  |
Total Accruing |  |  | 4,975 |  |  |
Current, Non-Accruing |  |  | 0 |  |  |
Total Non-Accruing |  |  | 0 |  |  |
Total loans, net of unearned income |  |  | 4,975 |  |  |
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing |  |  | 128 |  |  |
Past Due, Non-Accruing |  |  | 0 |  |  |
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing |  |  | 95 |  |  |
Past Due, Non-Accruing |  |  | 0 |  |  |
Consumer | Consumer Real Estate (a) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 5,988,115 |  | 6,048,510 |  |  |
Total Accruing | 6,028,201 |  | 6,091,445 |  |  |
Current, Non-Accruing | 65,668 |  | 63,717 |  |  |
Total Non-Accruing | 91,182 |  | 85,694 |  |  |
Total loans, net of unearned income | 6,119,383 |  | 6,177,139 |  | 6,360,763 |
Allowance for loan losses | 123,022 |  | 28,443 |  | 34,154 | 37,439
Consumer | Consumer Real Estate (a) | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 27,954 |  | 24,820 |  |  |
Past Due, Non-Accruing | 5,967 |  | 5,303 |  |  |
Consumer | Consumer Real Estate (a) | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 12,132 |  | 18,115 |  |  |
Past Due, Non-Accruing | 19,547 |  | 16,674 |  |  |
Consumer | Consumer Real Estate (a) | HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 1,186,834 |  | 1,217,344 |  |  |
Total Accruing | 1,202,875 |  | 1,232,169 |  |  |
Current, Non-Accruing | 41,506 |  | 43,007 |  |  |
Total Non-Accruing | 51,177 |  | 54,706 |  |  |
Total loans, net of unearned income | 1,254,052 |  | 1,286,875 |  |  |
Consumer | Consumer Real Estate (a) | HELOC | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 10,213 |  | 9,156 |  |  |
Past Due, Non-Accruing | 3,547 |  | 4,227 |  |  |
Consumer | Consumer Real Estate (a) | HELOC | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 5,828 |  | 5,669 |  |  |
Past Due, Non-Accruing | 6,124 |  | 7,472 |  |  |
Consumer | Consumer Real Estate (a) | R/E Installment Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 4,801,281 |  | 4,812,446 |  |  |
Total Accruing | 4,825,326 |  | 4,834,510 |  |  |
Current, Non-Accruing | 24,162 |  | 20,710 |  |  |
Total Non-Accruing | 40,005 |  | 30,988 |  |  |
Total loans, net of unearned income | 4,865,331 |  | 4,865,498 |  |  |
Consumer | Consumer Real Estate (a) | R/E Installment Loans | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 17,741 |  | 12,894 |  |  |
Past Due, Non-Accruing | 2,420 |  | 1,076 |  |  |
Consumer | Consumer Real Estate (a) | R/E Installment Loans | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 6,304 |  | 9,170 |  |  |
Past Due, Non-Accruing | 13,423 |  | 9,202 |  |  |
Consumer | Consumer Real Estate (a) | RE Installment Purchase Credit Impaired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing |  |  | 18,720 |  |  |
Total Accruing |  |  | 24,766 |  |  |
Current, Non-Accruing |  |  | 0 |  |  |
Total Non-Accruing |  |  | 0 |  |  |
Total loans, net of unearned income |  |  | 24,766 |  |  |
Consumer | Consumer Real Estate (a) | RE Installment Purchase Credit Impaired Loans | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing |  |  | 2,770 |  |  |
Past Due, Non-Accruing |  |  | 0 |  |  |
Consumer | Consumer Real Estate (a) | RE Installment Purchase Credit Impaired Loans | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing |  |  | 3,276 |  |  |
Past Due, Non-Accruing |  |  | 0 |  |  |
Consumer | Credit Card and Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 489,555 |  | 490,940 |  |  |
Total Accruing | 494,438 |  | 495,530 |  |  |
Current, Non-Accruing | 153 |  | 101 |  |  |
Total Non-Accruing | 360 |  | 334 |  |  |
Total loans, net of unearned income | 494,798 |  | 495,864 |  | 506,230 |
Allowance for loan losses | 19,327 |  | 13,266 |  | $ 12,662 | $ 12,727
Consumer | Credit Card and Other | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 3,037 |  | 2,976 |  |  |
Past Due, Non-Accruing | 38 |  | 44 |  |  |
Consumer | Credit Card and Other | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 1,846 |  | 1,614 |  |  |
Past Due, Non-Accruing | 169 |  | 189 |  |  |
Consumer | Credit Card and Other | Credit Card |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 189,247 |  | 198,917 |  |  |
Total Accruing | 192,855 |  | 201,171 |  |  |
Current, Non-Accruing | 0 |  | 0 |  |  |
Total Non-Accruing | 0 |  | 0 |  |  |
Total loans, net of unearned income | 192,855 |  | 201,171 |  |  |
Consumer | Credit Card and Other | Credit Card | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 1,893 |  | 1,076 |  |  |
Past Due, Non-Accruing | 0 |  | 0 |  |  |
Consumer | Credit Card and Other | Credit Card | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 1,715 |  | 1,178 |  |  |
Past Due, Non-Accruing | 0 |  | 0 |  |  |
Consumer | Credit Card and Other | Other Consumer Loans Class |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 300,308 |  | 291,700 |  |  |
Total Accruing | 301,583 |  | 293,839 |  |  |
Current, Non-Accruing | 153 |  | 101 |  |  |
Total Non-Accruing | 360 |  | 334 |  |  |
Total loans, net of unearned income | 301,943 |  | 294,173 |  |  |
Consumer | Credit Card and Other | Other Consumer Loans Class | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 1,144 |  | 1,802 |  |  |
Past Due, Non-Accruing | 38 |  | 44 |  |  |
Consumer | Credit Card and Other | Other Consumer Loans Class | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 131 |  | 337 |  |  |
Past Due, Non-Accruing | $ 169 |  | 189 |  |  |
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing |  |  | 323 |  |  |
Total Accruing |  |  | 520 |  |  |
Current, Non-Accruing |  |  | 0 |  |  |
Total Non-Accruing |  |  | 0 |  |  |
Total loans, net of unearned income |  |  | 520 |  |  |
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing |  |  | 98 |  |  |
Past Due, Non-Accruing |  |  | 0 |  |  |
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing |  |  | 99 |  |  |
Past Due, Non-Accruing |  |  | $ 0 |  |  |
[1] | March 31, 2020 and December 31, 2019 include $20.8 million and $18.8 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.

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