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Business Segment Information - Amounts of Consolidated Revenue, Expense, Tax and Assets (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting, Measurement Disclosures [Abstract] |  |  |  |
Number of operating segments | segment | 4 |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | $ 1,210,187 | $ 1,220,317 | $ 842,314
Provision/(provision credit) for loan losses |  | 47,000 | 7,000 | 0
Noninterest income |  | 654,080 | 722,788 | 490,219
Noninterest expense |  | 1,231,603 | 1,221,996 | 1,023,661
Income/(loss) before income taxes |  | 585,664 | 714,109 | 308,872
Provision/(benefit) for income taxes (Note 15) |  | 133,291 | 157,602 | 131,892
Net income/(loss) |  | 452,373 | 556,507 | 176,980
Average assets |  | 41,744,264 | 40,225,459 | 29,924,813
Depreciation and amortization |  | 65,239 | 59,125 | 70,924
Expenditures for long-lived assets |  | 49,159 | 38,166 | 287,642
Expenses associated with rebranding initiatives |  | 21,300 |  |
Charitable foundation contributions |  | 11,000 |  | 8,800
Regional Banking |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | 1,196,318 | 1,197,471 | 844,439
Provision/(provision credit) for loan losses |  | 66,059 | 24,643 | 21,451
Noninterest income |  | 329,834 | 311,763 | 259,546
Noninterest expense |  | 789,033 | 826,262 | 628,050
Income/(loss) before income taxes |  | 671,060 | 658,329 | 454,484
Provision/(benefit) for income taxes (Note 15) |  | 158,148 | 154,659 | 162,348
Net income/(loss) |  | 512,912 | 503,670 | 292,136
Average assets |  | 30,785,775 | 28,366,987 | 19,469,287
Depreciation and amortization |  | 31,719 | 31,316 | 45,734
Expenditures for long-lived assets |  | 35,207 | 36,164 | 274,992
Fixed Income |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | 26,044 | 35,753 | 18,122
Noninterest income |  | 278,423 | 164,769 | 217,086
Noninterest expense |  | 236,660 | 189,373 | 206,427
Income/(loss) before income taxes |  | 67,807 | 11,149 | 28,781
Provision/(benefit) for income taxes (Note 15) |  | 16,137 | 2,097 | 9,698
Net income/(loss) |  | 51,670 | 9,052 | 19,083
Average assets |  | 2,961,655 | 3,297,579 | 2,539,899
Depreciation and amortization |  | 8,150 | 9,603 | 8,036
Expenditures for long-lived assets |  | 909 | 646 | 1,877
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | (40,774) | (64,191) | (59,261)
Noninterest income |  | 41,357 | 239,263 | 8,887
Noninterest expense |  | 195,683 | 177,923 | 144,333
Income/(loss) before income taxes |  | (195,100) | (2,851) | (194,707)
Provision/(benefit) for income taxes (Note 15) |  | (51,348) | (10,889) | (47,967)
Net income/(loss) |  | (143,752) | 8,038 | (146,740)
Average assets |  | 6,951,611 | 7,090,069 | 6,370,951
Depreciation and amortization |  | 27,649 | 23,285 | 16,764
Expenditures for long-lived assets |  | 12,560 | 308 | 8,951
(Gain)/loss on securities |  |  |  | (14,300)
Non-Strategic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | 28,599 | 51,284 | 39,014
Provision/(provision credit) for loan losses |  | (19,059) | (17,643) | (21,451)
Noninterest income |  | 4,466 | 6,993 | 4,700
Noninterest expense |  | 10,227 | 28,438 | 44,851
Income/(loss) before income taxes |  | 41,897 | 47,482 | 20,314
Provision/(benefit) for income taxes (Note 15) |  | 10,354 | 11,735 | 7,813
Net income/(loss) |  | 31,543 | 35,747 | 12,501
Average assets |  | 1,045,223 | 1,470,824 | 1,544,676
Depreciation and amortization |  | (2,279) | (5,079) | 390
Expenditures for long-lived assets |  | $ 483 | 1,048 | $ 1,822
Visa Class B Shares |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gain on sale of investments |  |  | $ 212,900 |

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