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NON-CONSOLIDATED VARIABLE INTEREST ENTITIES (VIEs) AND SERVICING ASSETS - Weighted-Averages of Key Economic Assumptions in Valuation Model (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Jun. 30, 2023
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
NON-CONSOLIDATED VARIABLE INTEREST ENTITIES (VIEs) AND SERVICING ASSETS [Abstract]            
Carrying amount of servicing assets $ 27,601 $ 29,037 $ 28,034 $ 29,690 $ 30,277 $ 30,986
Fair value $ 45,114 $ 44,710        
Weighted-average expected life 7 years 9 months 7 years 9 months 18 days        
Constant prepayment rate 6.31% 6.40%        
Decrease in fair value due to 10% adverse change $ 1,036 $ 1,048        
Decrease in fair value due to 20% adverse change $ 2,027 $ 2,054        
Discount rate 10.72% 10.69%        
Decrease in fair value due to 10% adverse change $ 1,937 $ 1,925        
Decrease in fair value due to 20% adverse change $ 3,727 $ 3,704