General form of registration statement for all companies including face-amount certificate companies

LEASES - (Details)

v3.21.4
LEASES - (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]      
Number of operating lease sub leases | item 2 2  
Operating lease right of use asset   $ 124 $ 196
Finance lease right of use asset $ 877 608 466
Total right of use asset 877 732 662
Accumulated amortization of finance lease assets $ 1,800 $ 1,300 $ 1,000
Minimum      
Lessee, Lease, Description [Line Items]      
Rate of interest for finance lease 6.50% 6.50%  
Maximum      
Lessee, Lease, Description [Line Items]      
Rate of interest for finance lease 12.20% 2.20%