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Business Segment Information - Amounts of Consolidated Revenue, Expense, Tax and Assets (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting, Measurement Disclosures [Abstract] |  |  |  |  |
Number of operating segments | segment |  |  | 4 |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income |  |  | $ 1,220,317 | $ 842,314 | $ 729,084
Provision/(provision credit) for loan losses |  |  | 7,000 | 0 | 11,000
Noninterest income |  |  | 722,788 | 490,219 | 552,441
Noninterest expense |  |  | 1,221,996 | 1,023,661 | 925,204
Income/(loss) before income taxes |  |  | 714,109 | 308,872 | 345,321
Provision/(benefit) for income taxes (Note 15) |  |  | 157,602 | 131,892 | 106,810
Net income/(loss) |  |  | 556,507 | 176,980 | 238,511
Average assets |  |  | 40,225,459 | 29,924,813 | 27,427,227
Depreciation and amortization |  |  | 59,125 | 70,924 | 64,673
Expenditures for long-lived assets |  |  | 38,166 | 287,642 | 62,554
Regional Banking |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income |  |  | 1,202,317 | 846,620 | 742,131
Provision/(provision credit) for loan losses |  |  | 25,277 | 21,341 | 38,886
Noninterest income |  |  | 309,308 | 258,627 | 248,996
Noninterest expense |  |  | 824,740 | 626,304 | 612,983
Income/(loss) before income taxes |  |  | 661,608 | 457,602 | 339,258
Provision/(benefit) for income taxes (Note 15) |  |  | 155,471 | 163,547 | 121,304
Net income/(loss) |  |  | 506,137 | 294,055 | 217,954
Average assets |  |  | 28,470,388 | 19,507,765 | 17,137,709
Depreciation and amortization |  |  | 29,681 | 43,061 | 38,896
Expenditures for long-lived assets |  |  | 34,212 | 274,059 | 51,442
Fixed Income |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income |  |  | 35,715 | 18,065 | 10,802
Noninterest income |  |  | 164,767 | 217,082 | 269,344
Noninterest expense |  |  | 191,504 | 208,921 | 227,936
Income/(loss) before income taxes |  |  | 8,978 | 26,226 | 52,210
Provision/(benefit) for income taxes (Note 15) |  |  | 1,560 | 8,717 | 18,722
Net income/(loss) |  |  | 7,418 | 17,509 | 33,488
Average assets |  |  | 3,299,117 | 2,543,151 | 2,364,130
Depreciation and amortization |  |  | 9,724 | 8,737 | 5,770
Expenditures for long-lived assets |  |  | 755 | 2,499 | 2,019
Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income |  |  | (64,140) | (59,383) | (66,215)
Noninterest income |  |  | 239,252 | 8,878 | 20,453
Noninterest expense |  |  | 177,829 | 144,258 | 63,577
Income/(loss) before income taxes |  |  | (2,717) | (194,763) | (109,339)
Provision/(benefit) for income taxes (Note 15) |  |  | (10,856) | (47,989) | (57,698)
Net income/(loss) |  |  | 8,139 | (146,774) | (51,641)
Average assets |  |  | 7,092,078 | 6,367,268 | 6,037,624
Depreciation and amortization |  |  | 25,564 | 18,726 | 19,610
Expenditures for long-lived assets |  |  | 2,302 | 9,161 | 8,947
(Gain)/loss on securities |  | $ 14,300 |  | 14,300 |
Non-Strategic |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income |  |  | 46,425 | 37,012 | 42,366
Provision/(provision credit) for loan losses |  |  | (18,277) | (21,341) | (27,886)
Noninterest income |  |  | 9,461 | 5,632 | 13,648
Noninterest expense |  |  | 27,923 | 44,178 | 20,708
Income/(loss) before income taxes |  |  | 46,240 | 19,807 | 63,192
Provision/(benefit) for income taxes (Note 15) |  |  | 11,427 | 7,617 | 24,482
Net income/(loss) |  |  | 34,813 | 12,190 | 38,710
Average assets |  |  | 1,363,876 | 1,506,629 | 1,887,764
Depreciation and amortization |  |  | (5,844) | 400 | 397
Expenditures for long-lived assets |  |  | 897 | $ 1,923 | $ 146
Visa Class B Shares |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain on sale of investments | $ 212,900 |  | $ 212,900 |  |

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