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SERVICING RIGHTS - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Transfers and Servicing [Abstract]          
Income earned on mortgage servicing rights $ 2,007 $ 774 $ 1,565 $ 2,027  
Unpaid principal balance 3,100,000   3,100,000   $ 1,920,000
Escrow balances 17,700   17,700   8,300
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Servicing rights held for sale, carried at fair value 0   $ 0   5,947
Discount rate     7.25%    
Prepayment speed     7.25%    
Recurring | Significant Unobservable Inputs (Level 3)          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Servicing rights held for sale, carried at fair value $ 0   $ 0   $ 5,900