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Loans and Leases - Accruing And Non-Accruing Loans By Class (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | $ 59,171,038 |  | $ 30,841,035 |  |  |
Total Accruing | 59,259,695 |  | 30,898,946 |  |  |
Current, Non-Accruing | 272,103 |  | 100,382 |  |  |
Total Non-Accruing | 446,836 |  | 162,165 |  |  |
Total loans, net of unearned income | 59,706,531 |  | 31,061,111 |  |  |
Allowance for loan and lease losses | 988,102 | $ 537,881 | 200,307 | $ 193,149 | $ 192,749 | $ 180,424
30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 74,042 |  | 36,052 |  |  |
Past Due, Non-Accruing | 36,600 |  | 20,217 |  |  |
90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 14,615 |  | 21,859 |  |  |
Past Due, Non-Accruing | 138,133 |  | 41,566 |  |  |
Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans, net of unearned income | 33,655,717 |  | 20,051,091 |  |  |
Allowance for loan and lease losses |  |  | 158,598 |  |  |
Commercial | Commercial and industrial (a) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 33,422,866 |  | 19,967,302 |  |  |
Total Accruing | 33,442,907 |  | 19,976,779 |  |  |
Current, Non-Accruing | 126,674 |  | 36,564 |  |  |
Total Non-Accruing | 212,810 |  | 74,312 |  |  |
Total loans, net of unearned income | 28,048,649 |  | 15,640,208 |  |  |
Allowance for loan and lease losses | 489,094 | 318,722 | 122,486 | 114,130 | 116,096 | 98,947
Commercial | Commercial and industrial (a) | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 19,892 |  | 7,442 |  |  |
Past Due, Non-Accruing | 25,327 |  | 14,385 |  |  |
Commercial | Commercial and industrial (a) | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 149 |  | 2,035 |  |  |
Past Due, Non-Accruing | 60,809 |  | 23,363 |  |  |
Commercial | Commercial and industrial (a) | C&I |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 27,815,798 |  | 15,532,579 |  |  |
Total Accruing | 27,835,839 |  | 15,539,971 |  |  |
Current, Non-Accruing | 126,674 |  | 36,564 |  |  |
Total Non-Accruing | 212,810 |  | 74,312 |  |  |
Total loans, net of unearned income | 28,048,649 |  | 15,614,283 |  |  |
Nonaccrual, no allowance | 125,700 |  |  |  |  |
Commercial | Commercial and industrial (a) | C&I | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 19,892 |  | 7,155 |  |  |
Past Due, Non-Accruing | 25,327 |  | 14,385 |  |  |
Commercial | Commercial and industrial (a) | C&I | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 149 |  | 237 |  |  |
Past Due, Non-Accruing | 60,809 |  | 23,363 |  |  |
Commercial | Commercial and industrial (a) | Loans to mortgage companies |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 5,607,068 |  | 4,410,883 |  |  |
Total Accruing | 5,607,068 |  | 4,410,883 |  |  |
Current, Non-Accruing | 0 |  | 0 |  |  |
Total Non-Accruing | 0 |  | 0 |  |  |
Total loans, net of unearned income | 5,607,068 |  | 4,410,883 |  |  |
Commercial | Commercial and industrial (a) | 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 and industrial (a) | 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 and industrial (a) | TRUPS |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans, net of unearned income | 209,400 |  | 218,300 |  |  |
Allowance for loan and lease losses | 18,200 |  | 19,100 |  |  |
Commercial | Commercial and industrial (a) | 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 and industrial (a) | 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 and industrial (a) | 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 |  |  | 4,334,283 |  |  |
Total Accruing |  |  | 4,335,192 |  |  |
Current, Non-Accruing |  |  | 0 |  |  |
Total Non-Accruing |  |  | 1,825 |  |  |
Total loans, net of unearned income | 12,510,887 |  | 4,337,017 |  |  |
Allowance for loan and lease losses | 207,958 | 57,285 | 36,112 | 35,625 | 32,953 | 31,311
Commercial | Commercial real estate | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing |  |  | 814 |  |  |
Past Due, Non-Accruing |  |  | 485 |  |  |
Commercial | Commercial real estate | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing |  |  | 95 |  |  |
Past Due, Non-Accruing |  |  | 1,340 |  |  |
Commercial | Commercial real estate | CRE |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing |  |  | 4,329,531 |  |  |
Total Accruing |  |  | 4,330,217 |  |  |
Current, Non-Accruing |  |  | 0 |  |  |
Total Non-Accruing |  |  | 1,825 |  |  |
Total loans, net of unearned income | 12,510,887 |  | 4,332,042 |  |  |
Commercial | Commercial real estate | CRE | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing |  |  | 686 |  |  |
Past Due, Non-Accruing |  |  | 485 |  |  |
Commercial | Commercial real estate | CRE | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing |  |  | 0 |  |  |
Past Due, Non-Accruing |  |  | 1,340 |  |  |
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 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans, net of unearned income | 12,327,869 |  | 6,177,139 |  |  |
Consumer | Consumer Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 12,099,420 |  | 6,048,510 |  |  |
Total Accruing | 12,147,781 |  | 6,091,445 |  |  |
Current, Non-Accruing | 101,707 |  | 63,717 |  |  |
Total Non-Accruing | 180,088 |  | 85,694 |  |  |
Total loans, net of unearned income | 12,327,869 |  | 6,177,139 |  |  |
Allowance for loan and lease losses | 265,430 | 143,757 | 28,443 | 30,674 | 31,532 | 37,439
Consumer | Consumer Real Estate | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 34,806 |  | 24,820 |  |  |
Past Due, Non-Accruing | 8,022 |  | 5,303 |  |  |
Consumer | Consumer Real Estate | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 13,555 |  | 18,115 |  |  |
Past Due, Non-Accruing | 70,359 |  | 16,674 |  |  |
Consumer | Consumer Real Estate | HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 2,467,907 |  | 1,217,344 |  |  |
Total Accruing | 2,486,683 |  | 1,232,169 |  |  |
Current, Non-Accruing | 47,101 |  | 43,007 |  |  |
Total Non-Accruing | 63,154 |  | 54,706 |  |  |
Total loans, net of unearned income | 2,549,837 |  | 1,286,875 |  |  |
Consumer | Consumer Real Estate | HELOC | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 11,884 |  | 9,156 |  |  |
Past Due, Non-Accruing | 4,628 |  | 4,227 |  |  |
Consumer | Consumer Real Estate | HELOC | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 6,892 |  | 5,669 |  |  |
Past Due, Non-Accruing | 11,425 |  | 7,472 |  |  |
Consumer | Consumer Real Estate | R/E Installment Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 9,631,513 |  | 4,812,446 |  |  |
Total Accruing | 9,661,098 |  | 4,834,510 |  |  |
Current, Non-Accruing | 54,606 |  | 20,710 |  |  |
Total Non-Accruing | 116,934 |  | 30,988 |  |  |
Total loans, net of unearned income | 9,778,032 |  | 4,865,498 |  |  |
Consumer | Consumer Real Estate | R/E Installment Loans | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 22,922 |  | 12,894 |  |  |
Past Due, Non-Accruing | 3,394 |  | 1,076 |  |  |
Consumer | Consumer Real Estate | R/E Installment Loans | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 6,663 |  | 9,170 |  |  |
Past Due, Non-Accruing | 58,934 |  | 9,202 |  |  |
Consumer | Consumer Real Estate | 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 | 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 | 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 | 1,204,059 |  | 490,940 |  |  |
Total Accruing | 1,209,181 |  | 495,530 |  |  |
Current, Non-Accruing | 1,205 |  | 101 |  |  |
Total Non-Accruing | 2,877 |  | 334 |  |  |
Total loans, net of unearned income | 1,212,058 |  | 495,864 |  |  |
Allowance for loan and lease losses | 25,620 | $ 18,117 | 13,266 | $ 12,720 | $ 12,168 | $ 12,727
Consumer | Credit Card and Other | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 4,211 |  | 2,976 |  |  |
Past Due, Non-Accruing | 720 |  | 44 |  |  |
Consumer | Credit Card and Other | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 911 |  | 1,614 |  |  |
Past Due, Non-Accruing | 952 |  | 189 |  |  |
Consumer | Credit Card and Other | Credit Card |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 267,880 |  | 198,917 |  |  |
Total Accruing | 270,182 |  | 201,171 |  |  |
Current, Non-Accruing | 242 |  | 0 |  |  |
Total Non-Accruing | 329 |  | 0 |  |  |
Total loans, net of unearned income | 270,511 |  | 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 | 1,513 |  | 1,076 |  |  |
Past Due, Non-Accruing | 38 |  | 0 |  |  |
Consumer | Credit Card and Other | Credit Card | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 789 |  | 1,178 |  |  |
Past Due, Non-Accruing | 49 |  | 0 |  |  |
Consumer | Credit Card and Other | Other Consumer Loans Class |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 936,179 |  | 291,700 |  |  |
Total Accruing | 938,999 |  | 293,839 |  |  |
Current, Non-Accruing | 963 |  | 101 |  |  |
Total Non-Accruing | 2,548 |  | 334 |  |  |
Total loans, net of unearned income | 941,547 |  | 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 | 2,698 |  | 1,802 |  |  |
Past Due, Non-Accruing | 682 |  | 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 | 122 |  | 337 |  |  |
Past Due, Non-Accruing | 903 |  | 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 |  |  |
Commercial real estate | Commercial real estate | CRE |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 12,444,693 |  |  |  |  |
Total Accruing | 12,459,826 |  |  |  |  |
Current, Non-Accruing | 42,517 |  |  |  |  |
Total Non-Accruing | 51,061 |  |  |  |  |
Total loans, net of unearned income | 12,510,887 |  |  |  |  |
Commercial real estate | Commercial real estate | CRE | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 15,133 |  |  |  |  |
Past Due, Non-Accruing | 2,531 |  |  |  |  |
Commercial real estate | Commercial real estate | CRE | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 0 |  |  |  |  |
Past Due, Non-Accruing | $ 6,013 |  |  |  |  |

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