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NON-CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS - Weighted-Averages of Key Economic Assumptions in Valuation Model (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2012
Carrying amount of servicing assets $ 26,244 $ 24,282 $ 22,838 $ 21,987
Fair value $ 29,664      
Weighted-average expected life 8 years 6 months 29 days      
Decrease in fair value due to 10% adverse change $ 758      
Decrease in fair value due to 20% adverse change 1,483      
Decrease in fair value due to 10% adverse change 1,413      
Decrease in fair value due to 20% adverse change $ 2,708      
Weighted Average [Member]        
Constant prepayment rate 6.12%      
Discount rate 11.19%