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MORTGAGE BANKING ACTIVITIES - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 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 $ 1,127,541 $ 801,509 $ 3,404,030 $ 2,028,108
Proceeds from sale of mortgage loans held-for-sale 1,190,000 798,300 3,330,000 1,980,000
Net gain on sale of mortgage loans held for sale $ 32,900 $ 23,800 $ 102,100 $ 62,200
Margin on sale of mortgage loans held for sale 2.92% 2.97% 3.00% 3.07%
Loan origination fees $ 4,100 $ 3,100 $ 12,200 $ 8,200
Loans sold 11,600 7,300 35,100 17,900
Provision for loss reimbursement on sold loans 179 1,154 2,023 2,055
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 716 1,556 3,600 3,100
Initial provision for loan repurchases $ 537 $ 402 $ 1,600 $ 1,000