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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Jan. 31, 2020
Schedule of Equity Method Investments [Line Items]        
Equity Method Investments   $ 0.2 $ 0.3  
Proportional Amortization Investments   26.6 28.1  
Cost method investment   $ 3.6 $ 1.6  
Number of operating segments | segment   1    
Available for sale accrued interest receivable   $ 4.1    
Financing receivable accrued interest receivable   $ 13.0    
Financing Receivable, Accrued Interest, Allowance for Credit Loss $ 0.2      
Provision for Loan, Lease, and Other Losses $ 0.2      
Oahu HomeLoans, LLC        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage       50.00%