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SERVICING RIGHTS - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Income earned on mortgage servicing rights $ 2,974 $ 4,199 $ 2,049
Gain (loss) on fair value of servicing rights (8,800) (1,600) 298
Revenue earned on mortgage servicing rights 11,700 5,800 $ 1,800
Unpaid principal balance 4,770,000 1,920,000  
Escrow balances 21,100 8,300  
Servicing rights held-for-sale, carried at fair value $ 0 5,947  
Discount rate 7.50%    
Prepayment speed 7.50%    
Significant Unobservable Inputs (Level 3) | Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Servicing rights held-for-sale, carried at fair value   $ 5,900