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Business Segment Information - Amounts Of Consolidated Revenue, Expense, Tax And Assets (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($)
Segment Reporting [Abstract] |  |  |  |
Number of business segments | segment |  |  | 4 |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income | $ 305,700 | $ 209,817 | $ 917,805 | $ 600,226
Provision/(provision credit) for loan losses | 2,000 | 0 | 1,000 | (3,000)
Noninterest income | 348,972 | 112,417 | 612,514 | 357,029
Noninterest expense | 294,031 | 236,869 | 940,064 | 676,991
Income/(loss) before income taxes | 358,641 | 85,365 | 589,255 | 283,264
Provision/(benefit) for income taxes | 83,925 | 13,596 | 133,553 | 57,903
Net income/(loss) | 274,716 | 71,769 | 455,702 | 225,361
Average assets | 40,077,033 | 28,874,827 | 40,199,487 | 28,852,679
Loss on sale of equity investments |  |  | (212,924) | (5)
Gain on sale of TRUPs loans |  |  | (3,777) | 0
Visa Class B Shares |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gain on sale of investments | 212,900 |  | 212,900 |
Regional Banking |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income | 302,448 | 209,100 | 902,546 | 604,075
Provision/(provision credit) for loan losses | 8,045 | 8,552 | 17,428 | 11,910
Noninterest income | 79,857 | 64,370 | 240,093 | 188,089
Noninterest expense | 207,591 | 150,445 | 619,283 | 451,135
Income/(loss) before income taxes | 166,669 | 114,473 | 505,928 | 329,119
Provision/(benefit) for income taxes | 39,101 | 41,191 | 118,929 | 118,771
Net income/(loss) | 127,568 | 73,282 | 386,999 | 210,348
Average assets | 28,659,158 | 19,158,852 | 28,450,747 | 18,519,999
Fixed Income |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income | 9,048 | 5,985 | 26,686 | 12,126
Noninterest income | 41,123 | 55,803 | 125,091 | 161,833
Noninterest expense | 47,306 | 53,136 | 145,635 | 155,865
Income/(loss) before income taxes | 2,865 | 8,652 | 6,142 | 18,094
Provision/(benefit) for income taxes | 532 | 2,970 | 988 | 5,929
Net income/(loss) | 2,333 | 5,682 | 5,154 | 12,165
Average assets | 3,247,016 | 2,586,773 | 3,326,118 | 2,388,740
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income | (15,415) | (13,769) | (48,651) | (42,408)
Noninterest income | 222,619 | (9,476) | 240,665 | 2,219
Noninterest expense | 33,323 | 23,926 | 152,797 | 65,365
Income/(loss) before income taxes | 173,881 | (47,171) | 39,217 | (105,554)
Provision/(benefit) for income taxes | 40,529 | (34,167) | 4,253 | (82,758)
Net income/(loss) | 133,352 | (13,004) | 34,964 | (22,796)
Average assets | 6,904,585 | 5,697,894 | 6,990,484 | 6,421,643
Loss on sale of equity investments |  | 14,300 |  | 14,300
Non-Strategic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income | 9,619 | 8,501 | 37,224 | 26,433
Provision/(provision credit) for loan losses | (6,045) | (8,552) | (16,428) | (14,910)
Noninterest income | 5,373 | 1,720 | 6,665 | 4,888
Noninterest expense | 5,811 | 9,362 | 22,349 | 4,626
Income/(loss) before income taxes | 15,226 | 9,411 | 37,968 | 41,605
Provision/(benefit) for income taxes | 3,763 | 3,602 | 9,383 | 15,961
Net income/(loss) | 11,463 | 5,809 | 28,585 | 25,644
Average assets | $ 1,266,274 | $ 1,431,308 | 1,432,138 | $ 1,522,297
Gain on sale of TRUPs loans |  |  | $ 3,800 |

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- Definition The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence. + References No definition available. + Details
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- Definition The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(a)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(9)(a)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(7)(c)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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