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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.