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MORTGAGE BANKING ACTIVITIES - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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 $ 4,388,042 $ 2,822,406 $ 1,942,622
Proceeds from sale of mortgage loans held-for-sale 4,300,000 2,750,000 1,860,000
Net gain on sale of mortgage loans held for sale $ 128,700 $ 84,100 $ 58,000
Margin on sale of mortgage loans held for sale 2.93% 2.98% 2.99%
Loan origination fees $ 15,900 $ 11,300 $ 9,900
Loans sold 44,300 25,200 10,900
Provision for loss reimbursement on sold loans 2,326 2,808 2,383
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 4,400 4,200 $ 2,400
Initial provision for loan repurchases $ 2,000 $ 1,400