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MORTGAGE BANKING ACTIVITIES - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
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 $ 1,268,770 $ 715,148 $ 2,276,490 $ 1,226,599
Proceeds from sale of mortgage loans held-for-sale 1,220,000 651,000 2,140,000 1,183,700
Net gain on sale of mortgage loans held for sale $ 34,800 $ 23,200 $ 69,200 $ 38,400
Margin on sale of mortgage loans held for sale 2.75% 3.25% 3.04% 3.13%
Loan origination fees $ 4,600 $ 2,900 $ 8,100 $ 5,100
Loans sold 13,600 5,900 23,400 10,700
Provision for loss reimbursement on sold loans 999 330 1,844 901
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 1,600 968 2,900 1,500
Initial provision for loan repurchases $ 574 $ 638 $ 1,100 $ 638