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Segment Results (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net interest income |  | $ 325,573 | $ 285,097 | $ 653,439 | $ 577,865 |
Provision for (recovery of) losses |  | 895 | 334 | 719 | 341 |
Non-interest income | [1] | 37,366 | 61,901 | 72,603 | 114,135 |
Non-interest expense | [2] | 160,911 | 151,930 | 319,359 | 308,766 |
Income before income taxes |  | 201,133 | 194,734 | 405,964 | 382,893 |
Income tax (benefit) expense |  | 74,673 | 71,030 | 149,595 | 139,930 |
Net (loss) income |  | 126,460 | 123,704 | 256,369 | 242,963 |
Identifiable segment assets (period-end) |  | 49,035,747 | 48,648,532 | 49,035,747 | 48,648,532 | $ 50,317,796
Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Non-interest income |  | 37,366 | 61,901 | 72,603 | 114,135 |
Banking Operations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net interest income |  | 321,663 | 280,006 | 646,580 | 569,291 |
Provision for (recovery of) losses |  | 895 | 334 | 719 | 341 |
Non-interest income | [1] | 29,899 | 45,355 | 60,485 | 78,509 |
Non-interest expense | [2] | 144,152 | 135,476 | 286,202 | 275,627 |
Income before income taxes |  | 202,198 | 185,490 | 411,715 | 363,601 |
Income tax (benefit) expense |  | 75,097 | 67,246 | 151,912 | 132,136 |
Net (loss) income |  | 127,101 | 118,244 | 259,803 | 231,465 |
Identifiable segment assets (period-end) |  | 48,137,359 | 48,011,913 | 48,137,359 | 48,011,913 |
Banking Operations | Inter-segment |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Non-interest income |  | (4,317) | (4,061) | (8,429) | (8,231) |
Banking Operations | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Non-interest income |  | 25,582 | 41,294 | 52,056 | 70,278 |
Residential Mortgage Banking |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net interest income |  | 3,910 | 5,091 | 6,859 | 8,574 |
Non-interest income | [1] | 7,467 | 16,546 | 12,118 | 35,626 |
Non-interest expense | [2] | 16,759 | 16,454 | 33,157 | 33,139 |
Income before income taxes |  | (1,065) | 9,244 | (5,751) | 19,292 |
Income tax (benefit) expense |  | (424) | 3,784 | (2,317) | 7,794 |
Net (loss) income |  | (641) | 5,460 | (3,434) | 11,498 |
Identifiable segment assets (period-end) |  | 898,388 | 636,619 | 898,388 | 636,619 |
Residential Mortgage Banking | Inter-segment |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Non-interest income |  | 4,317 | 4,061 | 8,429 | 8,231 |
Residential Mortgage Banking | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Non-interest income |  | $ 11,784 | $ 20,607 | $ 20,547 | $ 43,857 |
[1] | Includes ancillary fee income.
[2] | Includes both direct and indirect expenses.

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