XML 142 R131.htm IDEA: XBRL DOCUMENT v3.21.2
NON CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS - Weighted-Averages of Key Economic Assumptions in Valuation Model (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Jun. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Transfers and Servicing [Abstract]            
Carrying amount of servicing assets $ 31,685 $ 33,071 $ 32,335 $ 33,344 $ 26,040 $ 26,762
Fair value $ 41,000 $ 40,294        
Weighted-average expected life 7 years 11 months 1 day 7 years 10 months 9 days        
Constant prepayment rate 6.61% 6.73%        
Decrease in fair value due to 10% adverse change, constant prepayment rate $ 1,015 $ 1,006        
Decrease in fair value due to 20% adverse change, constant prepayment rate $ 1,986 $ 1,970        
Discount rate 11.18% 11.20%        
Decrease in fair value due to 10% adverse change, discount rate $ 1,794 $ 1,772        
Decrease in fair value due to 20% adverse change, discount rate $ 3,450 $ 3,409