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SERVICING RIGHTS - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Transfers and Servicing [Abstract]          
Income (loss) earned on mortgage servicing rights $ (3,347) $ 2,007 $ (8,635) $ 1,565  
Loss on fair values of servicing rights 8,600 666 18,700 3,100  
Revenue earned on mortgage servicing rights 5,200 $ 2,700 10,100 $ 4,700  
Unpaid principal balance 6,320,000   6,320,000   $ 4,770,000
Escrow balances $ 36,600   $ 36,600   $ 21,100
Discount rate     7.50%    
Prepayment speed calculation percentage     7.50%