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Segment Results (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net interest income |  | $ 318,423 | $ 279,412 | $ 971,862 | $ 857,277 |
Provision for (recovery of) losses |  | (55) | (9,028) | 664 | (8,687) |
Non-interest income | [1] | 40,595 | 37,587 | 113,198 | 151,722 |
Non-interest expense | [2] | 161,685 | 147,308 | 481,044 | 456,074 |
Income before income taxes |  | 197,388 | 178,719 | 603,352 | 561,612 |
Income tax expense (benefit) |  | 72,089 | 64,031 | 221,684 | 203,961 |
Net income (loss) |  | 125,299 | 114,688 | 381,668 | 357,651 |
Identifiable segment assets (period-end) |  | 49,462,620 | 49,045,482 | 49,462,620 | 49,045,482 | $ 50,317,796
Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Non-interest income |  | 40,595 | 37,587 | 113,198 | 151,722 |
Banking Operations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net interest income |  | 314,081 | 275,990 | 960,661 | 845,281 |
Provision for (recovery of) losses |  | (55) | (9,028) | 664 | (8,687) |
Non-interest income | [1] | 27,131 | 29,587 | 87,616 | 108,096 |
Non-interest expense | [2] | 144,504 | 130,832 | 430,706 | 406,459 |
Income before income taxes |  | 191,900 | 180,260 | 603,615 | 543,861 |
Income tax expense (benefit) |  | 69,905 | 64,654 | 221,817 | 196,790 |
Net income (loss) |  | 121,995 | 115,606 | 381,798 | 347,071 |
Identifiable segment assets (period-end) |  | 48,478,288 | 48,342,734 | 48,478,288 | 48,342,734 |
Banking Operations | Inter-segment |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Non-interest income |  | (4,863) | (3,513) | (13,292) | (11,744) |
Banking Operations | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Non-interest income |  | 22,268 | 26,074 | 74,324 | 96,352 |
Residential Mortgage Banking |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net interest income |  | 4,342 | 3,422 | 11,201 | 11,996 |
Non-interest income | [1] | 13,464 | 8,000 | 25,582 | 43,626 |
Non-interest expense | [2] | 17,181 | 16,476 | 50,338 | 49,615 |
Income before income taxes |  | 5,488 | (1,541) | (263) | 17,751 |
Income tax expense (benefit) |  | 2,184 | (623) | (133) | 7,171 |
Net income (loss) |  | 3,304 | (918) | (130) | 10,580 |
Identifiable segment assets (period-end) |  | 984,332 | 702,748 | 984,332 | 702,748 |
Residential Mortgage Banking | Inter-segment |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Non-interest income |  | 4,863 | 3,513 | 13,292 | 11,744 |
Residential Mortgage Banking | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Non-interest income |  | $ 18,327 | $ 11,513 | $ 38,874 | $ 55,370 |
[1] | Includes ancillary fee income.
[2] | Includes both direct and indirect expenses.

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