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Business Segments (Operating Results and Other Key Financial Measures) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Segment Reporting Information |  |  |  |  |
Net interest income before provision for credit losses | $ 369,807 | $ 348,720 | $ 1,099,594 | $ 1,017,092 |
Provision for credit losses | 38,284 | 10,542 | 80,108 | 46,296 |
Noninterest Income | 51,474 | 46,502 | 146,364 | 169,214 |
Noninterest expense | 176,630 | 179,815 | 541,215 | 526,369 |
Segment income (loss) before income taxes | 206,367 | 204,865 | 624,635 | 613,641 |
Segment net income | 171,416 | 171,302 | 485,820 | 530,683 |
Segment assets | 43,274,659 | 39,042,713 | 43,274,659 | 39,042,713 | $ 41,042,356
Consumer and Business Banking |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Net interest income before provision for credit losses | 170,183 | 182,272 | 536,153 | 538,568 |
Provision for credit losses | 4,251 | 705 | 8,880 | 7,212 |
Noninterest Income | 15,103 | 13,137 | 43,378 | 72,170 |
Noninterest expense | 86,489 | 87,640 | 258,051 | 259,416 |
Segment income (loss) before income taxes | 94,546 | 107,064 | 312,600 | 344,110 |
Segment net income | 67,592 | 76,711 | 223,478 | 246,555 |
Segment assets | 11,277,171 | 10,194,291 | 11,277,171 | 10,194,291 |
Commercial Banking |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Net interest income before provision for credit losses | 166,106 | 149,770 | 477,755 | 448,128 |
Provision for credit losses | 34,033 | 9,837 | 71,228 | 39,084 |
Noninterest Income | 33,731 | 27,861 | 91,931 | 86,043 |
Noninterest expense | 62,246 | 57,376 | 200,093 | 179,251 |
Segment income (loss) before income taxes | 103,558 | 110,418 | 298,365 | 315,836 |
Segment net income | 74,111 | 79,344 | 213,331 | 226,798 |
Segment assets | 24,885,849 | 22,930,768 | 24,885,849 | 22,930,768 |
Other |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Net interest income before provision for credit losses | 33,518 | 16,678 | 85,686 | 30,396 |
Provision for credit losses | 0 | 0 | 0 | 0 |
Noninterest Income | 2,640 | 5,504 | 11,055 | 11,001 |
Noninterest expense | 27,895 | 34,799 | 83,071 | 87,702 |
Segment income (loss) before income taxes | 8,263 | (12,617) | 13,670 | (46,305) |
Segment net income | 29,713 | 15,247 | 49,011 | 57,330 |
Segment assets | $ 7,111,639 | $ 5,917,654 | $ 7,111,639 | $ 5,917,654 |

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