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Segment Results (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | $ 1,130,003 | $ 1,287,382 | $ 408,075
Provision for (recovery of) losses |  | 37,242 | 4,180 | (15,004)
Non-interest income |  | 216,880 | 145,572 | 210,763
Gain on sale of mortgage banking operation |  | 7,359 |  |
Non-interest expense | [1] | 641,426 | 651,646 | 765,855
Income (loss) before income taxes |  | 668,215 | 777,128 | (132,013)
Income tax expense (benefit) |  | 202,014 | 281,727 | (84,857)
Net income (loss) |  | 466,201 | 495,401 | (47,156)
Identifiable segment assets (period-end) |  | 49,124,195 | 48,926,555 | 50,317,796
Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income | [2] | 209,521 | 145,572 | 210,763
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income |  | 216,880 | 145,572 | 210,763
Banking Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | 1,121,460 | 1,272,423 | 393,074
Provision for (recovery of) losses |  | 37,242 | 4,180 | (15,004)
Non-interest expense | [1] | 594,394 | 584,894 | 700,469
Income (loss) before income taxes |  | 668,166 | 781,904 | (152,903)
Income tax expense (benefit) |  | 201,994 | 283,656 | (93,297)
Net income (loss) |  | 466,172 | 498,248 | (59,606)
Identifiable segment assets (period-end) |  | 49,124,195 | 48,195,581 | 49,619,931
Banking Operations | Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income | [2] | 188,564 | 116,200 | 154,847
Banking Operations | Inter-segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income |  | (10,222) | (17,645) | (15,359)
Banking Operations | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income |  | 178,342 | 98,555 | 139,488
Residential Mortgage Banking |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | 8,543 | 14,959 | 15,001
Gain on sale of mortgage banking operation |  | 7,359 |  |
Non-interest expense | [1] | 47,032 | 66,752 | 65,386
Income (loss) before income taxes |  | 49 | (4,776) | 20,890
Income tax expense (benefit) |  | 20 | (1,929) | 8,440
Net income (loss) |  | 29 | (2,847) | 12,450
Identifiable segment assets (period-end) |  |  | 730,974 | 697,865
Residential Mortgage Banking | Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income | [2] | 20,957 | 29,372 | 55,916
Residential Mortgage Banking | Inter-segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income |  | 10,222 | 17,645 | 15,359
Residential Mortgage Banking | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income |  | $ 38,538 | $ 47,017 | $ 71,275
[1] | Includes both direct and indirect expenses.
[2] | Includes ancillary fee income.

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