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SEGMENT INFORMATION - Reconciliation of Reportable Segment Financial Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net Income (Loss):        
Income (loss) before income taxes $ 48,655 $ (19,150) $ 130,752 $ 35,606
Income tax (expense) benefit (12,332) 8,398 (30,249) 7,181
Net income 36,323 (10,752) 100,503 42,787
Segment Reconciling Items [Member]        
Net Income (Loss):        
Total income for segments and other 75,047 7,122 211,016 112,888
Other operating expenses (26,392) (26,272) (80,264) (77,282)
Income (loss) before income taxes 48,655 (19,150) 130,752 35,606
Income tax (expense) benefit (12,332) 8,398 (30,249) 7,181
Net income 36,323 (10,752) 100,503 42,787
Average assets:        
Total average earning assets for segments 11,298,071 11,083,964 11,297,409 11,019,249
Average non-earning assets 929,362 900,334 945,671 896,071
Total consolidated average assets $ 12,227,433 $ 11,984,298 $ 12,243,080 $ 11,915,320