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Business Segment Information (Amounts of Consolidated Revenue, Expense, Tax and Assets) (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting, Measurement Disclosures [Abstract] |  |  |  |
Number of operating segments | segment |  | 4 |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | $ 842,314,000 | $ 729,084,000 | $ 653,720,000
Provision/(provision credit) for loan losses |  | 0 | 11,000,000 | 9,000,000
Noninterest income |  | 490,219,000 | 552,441,000 | 517,325,000
Noninterest expense |  | 1,023,661,000 | 925,204,000 | 1,053,791,000
Income/(loss) before income taxes |  | 308,872,000 | 345,321,000 | 108,254,000
Provision/(benefit) for income taxes (Note 15) |  | 131,892,000 | 106,810,000 | 10,941,000
Net income/(loss) | $ 176,980,000 | 176,980,000 | 238,511,000 | 97,313,000
Average assets |  | 29,924,813,000 | 27,427,227,000 | 25,635,975,000
(Gain)/loss on securities |  | (109,000) | 144,000 | 458,000
Depreciation and amortization |  | 70,924,000 | 64,673,000 | 60,743,000
Expenditures for long-lived assets |  | 287,642,000 | 62,554,000 | 43,514,000
Regional Banking |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | 848,952,000 | 741,852,000 | 655,152,000
Provision/(provision credit) for loan losses |  | 21,647,000 | 38,887,000 | 34,545,000
Noninterest income |  | 258,609,000 | 249,003,000 | 251,586,000
Noninterest expense |  | 629,773,000 | 615,821,000 | 562,799,000
Income/(loss) before income taxes |  | 456,141,000 | 336,147,000 | 309,394,000
Provision/(benefit) for income taxes (Note 15) |  | 162,985,000 | 120,100,000 | 110,349,000
Net income/(loss) |  | 293,156,000 | 216,047,000 | 199,045,000
Average assets |  | 19,621,764,000 | 17,143,464,000 | 14,932,207,000
Depreciation and amortization |  | 43,255,000 | 39,177,000 | 37,997,000
Expenditures for long-lived assets |  | 276,012,000 | 51,354,000 | 37,367,000
Fixed Income |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | 18,010,000 | 10,765,000 | 15,517,000
Noninterest income |  | 217,077,000 | 269,339,000 | 231,314,000
Noninterest expense |  | 210,937,000 | 229,576,000 | 220,149,000
Income/(loss) before income taxes |  | 24,150,000 | 50,528,000 | 26,682,000
Provision/(benefit) for income taxes (Note 15) |  | 7,919,000 | 18,070,000 | 8,999,000
Net income/(loss) |  | 16,231,000 | 32,458,000 | 17,683,000
Average assets |  | 2,544,842,000 | 2,365,661,000 | 2,370,355,000
Depreciation and amortization |  | 9,026,000 | 5,981,000 | 6,108,000
Expenditures for long-lived assets |  | 2,106,000 | 2,099,000 | 1,706,000
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | (58,915,000) | (65,902,000) | (71,680,000)
Noninterest income |  | 8,926,000 | 20,436,000 | 23,331,000
Noninterest expense |  | 139,390,000 | 58,913,000 | 57,830,000
Income/(loss) before income taxes |  | (189,379,000) | (104,379,000) | (106,179,000)
Provision/(benefit) for income taxes (Note 15) |  | (45,922,000) | (55,777,000) | (80,085,000)
Net income/(loss) |  | (143,457,000) | (48,602,000) | (26,094,000)
Average assets |  | 6,278,281,000 | 6,030,313,000 | 6,001,168,000
(Gain)/loss on securities |  | 14,300,000 |  |
Depreciation and amortization |  | 18,249,000 | 19,078,000 | 16,054,000
Expenditures for long-lived assets |  | 9,383,000 | 8,946,000 | 3,971,000
Non-Strategic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | 34,267,000 | 42,369,000 | 54,731,000
Provision/(provision credit) for loan losses |  | (21,647,000) | (27,887,000) | (25,545,000)
Noninterest income |  | 5,607,000 | 13,663,000 | 11,094,000
Noninterest expense |  | 43,561,000 | 20,894,000 | 213,013,000
Income/(loss) before income taxes |  | 17,960,000 | 63,025,000 | (121,643,000)
Provision/(benefit) for income taxes (Note 15) |  | 6,910,000 | 24,417,000 | (28,322,000)
Net income/(loss) |  | 11,050,000 | 38,608,000 | (93,321,000)
Average assets |  | 1,479,926,000 | 1,887,789,000 | 2,332,245,000
Depreciation and amortization |  | 394 | 437,000 | 584,000
Expenditures for long-lived assets |  | $ 141,000 | $ 155,000 | $ 470,000

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