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MORTGAGE BANKING ACTIVITIES - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]        
Originations of loans held for sale from mortgage banking $ 1,280,000 $ 1,270,000 $ 2,301,125 $ 2,276,490
Proceeds from sale of mortgage loans held-for-sale 1,300,000 1,220,000 2,270,000 2,140,000
Net gain on sale of mortgage loans held for sale $ 38,900 $ 34,800 $ 68,600 $ 69,200
Margin on sale of mortgage loans held for sale 3.05% 2.75% 2.98% 3.04%
Loan origination fees $ 4,900 $ 4,600 $ 8,900 $ 8,100
Loans sold 12,400 13,600 20,800 23,400
Representations and Warranties Obligations and Corporate Guarantees        
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]        
Provision for loss reimbursement on sold loans 851 1,573 1,230 2,901
Initial provision for loan repurchases 992 574 1,700 1,100
Write off of initial estimate $ (141) $ 1,000 $ (500) $ 1,800