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Segment Results (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | $ 1,287,382 | $ 408,075 | $ 1,140,353
Provision for (recovery of) losses |  | 4,180 | (15,004) | (18,587)
Non-interest income | [1] | 145,572 | 210,763 | 201,593
Non-interest expense | [2] | 651,646 | 765,855 | 587,467
Income (loss) before income taxes |  | 777,128 | (132,013) | 773,066
Income tax expense (benefit) |  | 281,727 | (84,857) | 287,669
Net income (loss) |  | 495,401 | (47,156) | 485,397
Identifiable segment assets (period-end) |  | 48,926,555 | 50,317,796 | 48,559,217
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income |  | 145,572 | 210,763 | 201,593
Banking Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | 1,272,423 | 393,074 | 1,126,162
Provision for (recovery of) losses |  | 4,180 | (15,004) | (18,587)
Non-interest income | [1] | 116,200 | 154,847 | 135,834
Non-interest expense | [2] | 584,894 | 700,469 | 528,436
Income (loss) before income taxes |  | 781,904 | (152,903) | 738,626
Income tax expense (benefit) |  | 283,656 | (93,297) | 274,179
Net income (loss) |  | 498,248 | (59,606) | 464,447
Identifiable segment assets (period-end) |  | 48,195,581 | 49,619,931 | 47,897,672
Banking Operations | Inter-segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income |  | (17,645) | (15,359) | (13,521)
Banking Operations | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income |  | 98,555 | 139,488 | 122,313
Residential Mortgage Banking |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | 14,959 | 15,001 | 14,191
Non-interest income | [1] | 29,372 | 55,916 | 65,759
Non-interest expense | [2] | 66,752 | 65,386 | 59,031
Income (loss) before income taxes |  | (4,776) | 20,890 | 34,440
Income tax expense (benefit) |  | (1,929) | 8,440 | 13,490
Net income (loss) |  | (2,847) | 12,450 | 20,950
Identifiable segment assets (period-end) |  | 730,974 | 697,865 | 661,545
Residential Mortgage Banking | Inter-segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income |  | 17,645 | 15,359 | 13,521
Residential Mortgage Banking | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income |  | $ 47,017 | $ 71,275 | $ 79,280
[1] | Includes ancillary fee income.
[2] | Includes both direct and indirect expenses.

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