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Segment Results (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net interest income |  | $ 287,769 | $ 325,573 | $ 582,686 | $ 653,439 |
Provision (Recovery) of loan losses |  | (6,261) | 895 | (10,269) | 719 |
Non-interest income | [1] | 50,437 | 37,366 | 82,609 | 72,603 |
Non-interest expense | [2] | 163,765 | 160,911 | 330,708 | 319,359 |
Income before income taxes |  | 180,702 | 201,133 | 344,856 | 405,964 |
Income tax expense (benefit) |  | 65,447 | 74,673 | 125,644 | 149,595 |
Net income (loss) |  | 115,255 | 126,460 | 219,212 | 256,369 |
Identifiable segment assets (period-end) |  | 48,347,658 | 49,035,747 | 48,347,658 | 49,035,747 | $ 48,926,555
Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Non-interest income |  | 50,437 | 37,366 | 82,609 | 72,603 |
Banking Operations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net interest income |  | 284,944 | 321,663 | 577,221 | 646,580 |
Provision (Recovery) of loan losses |  | (6,261) | 895 | (10,269) | 719 |
Non-interest income | [1] | 41,756 | 29,899 | 63,625 | 60,485 |
Non-interest expense | [2] | 148,105 | 144,152 | 299,041 | 286,202 |
Income before income taxes |  | 180,804 | 202,198 | 344,263 | 411,715 |
Income tax expense (benefit) |  | 65,488 | 75,097 | 125,408 | 151,912 |
Net income (loss) |  | 115,316 | 127,101 | 218,855 | 259,803 |
Identifiable segment assets (period-end) |  | 47,770,885 | 48,137,359 | 47,770,885 | 48,137,359 |
Banking Operations | Inter-segment |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Non-interest income |  | (4,052) | (4,317) | (7,811) | (8,429) |
Banking Operations | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Non-interest income |  | 37,704 | 25,582 | 55,814 | 52,056 |
Residential Mortgage Banking |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net interest income |  | 2,825 | 3,910 | 5,465 | 6,859 |
Non-interest income | [1] | 8,681 | 7,467 | 18,984 | 12,118 |
Non-interest expense | [2] | 15,660 | 16,759 | 31,667 | 33,157 |
Income before income taxes |  | (102) | (1,065) | 593 | (5,751) |
Income tax expense (benefit) |  | (41) | (424) | 236 | (2,317) |
Net income (loss) |  | (61) | (641) | 357 | (3,434) |
Identifiable segment assets (period-end) |  | 576,773 | 898,388 | 576,773 | 898,388 |
Residential Mortgage Banking | Inter-segment |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Non-interest income |  | 4,052 | 4,317 | 7,811 | 8,429 |
Residential Mortgage Banking | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Non-interest income |  | $ 12,733 | $ 11,784 | $ 26,795 | $ 20,547 |
[1] | Includes ancillary fee income.
[2] | Includes both direct and indirect expenses.

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