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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
 9 Months Ended
Mar. 16, 2020
Sep. 30, 2021
USD ($)
Subsidary
Family
ResidentialHouse
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Mar. 27, 2020
USD ($)
Property, Plant and Equipment [Line Items]          
Number of subsidiaries | Subsidary   6      
Decrease to retained earnings   $ 100,910,000   $ 113,449,000  
Retained earnings, net of tax     $ 955,000    
Number of families secured by loans of real estate | Family   4      
Number of housing units secured by loans from segment | ResidentialHouse   5      
Paycheck Protection Program Loans          
Property, Plant and Equipment [Line Items]          
Percentage of government guaranteed loans   100.00%      
COVID-19          
Property, Plant and Equipment [Line Items]          
Maximum authorized amount of coronavirus aid, relief and economic security         $ 2,000,000,000,000
Description of federal fund interest rate   Due to the COVID-19 pandemic, market interest rates declined significantly, with the 10-year Treasury bond falling below 1.00% on March 3, 2020 for the first time. On March 16, 2020, the Federal Open Market Committee reduced the target federal funds rate range to 0.00% to 0.25%, at which it remains as of September 30, 2021.      
COVID-19 | Minimum          
Property, Plant and Equipment [Line Items]          
Federal open market committee reduced target federal funds interest rate. 0.00%        
COVID-19 | Maximum          
Property, Plant and Equipment [Line Items]          
Federal open market committee reduced target federal funds interest rate. 0.25%