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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
6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Transfers and Servicing [Abstract]            
Carrying amount of servicing assets $ 27,231 $ 27,431 $ 27,428 $ 27,191 $ 26,135 $ 25,255
Fair value $ 30,396          
Weighted-average expected life 8 years 3 months 25 days          
Constant prepayment rate 6.48%          
Decrease in fair value due to 10% adverse change, constant prepayment rate $ 750          
Decrease in fair value due to 20% adverse change, constant prepayment rate $ 1,468          
Discount rate 11.26%          
Decrease in fair value due to 10% adverse change, discount rate $ 1,427          
Decrease in fair value due to 20% adverse change, discount rate $ 2,739