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Segment Results (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | $ 327,866 | $ 292,768 |
Provision for (recovery of) losses |  | (176) | 7 |
Non-Interest Income | [1] | 35,237 | 52,234 |
Non-interest expense | [2] | 158,448 | 156,836 |
Income before income taxes |  | 204,831 | 188,159 |
Income tax (benefit) expense |  | 74,922 | 68,900 |
Net (loss) income |  | 129,909 | 119,259 |
Identifiable segment assets (period-end) |  | 48,515,572 | 48,251,715 | $ 50,317,796
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-Interest Income |  | 35,237 | 52,234 |
Banking Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | 324,917 | 289,285 |
Provision for (recovery of) losses |  | (176) | 7 |
Non-Interest Income | [1] | 30,586 | 33,154 |
Non-interest expense | [2] | 142,050 | 140,151 |
Income before income taxes |  | 209,517 | 178,111 |
Income tax (benefit) expense |  | 76,815 | 64,890 |
Net (loss) income |  | 132,702 | 113,221 |
Identifiable segment assets (period-end) |  | 47,739,937 | 47,573,020 |
Banking Operations | Inter-segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-Interest Income |  | (4,112) | (4,170) |
Banking Operations | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-Interest Income |  | 26,474 | 28,984 |
Residential Mortgage Banking |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | 2,949 | 3,483 |
Non-Interest Income | [1] | 4,651 | 19,080 |
Non-interest expense | [2] | 16,398 | 16,685 |
Income before income taxes |  | (4,686) | 10,048 |
Income tax (benefit) expense |  | (1,893) | 4,010 |
Net (loss) income |  | (2,793) | 6,038 |
Identifiable segment assets (period-end) |  | 775,635 | 678,695 |
Residential Mortgage Banking | Inter-segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-Interest Income |  | 4,112 | 4,170 |
Residential Mortgage Banking | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-Interest Income |  | $ 8,763 | $ 23,250 |
[1] | Includes ancillary fee income.
[2] | Includes both direct and indirect expenses.

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