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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
segment
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jan. 31, 2020
Schedule of Equity Method Investments [Line Items]        
Equity Method Investments $ 0.2   $ 0.3  
Proportional Amortization Investments 27.7   28.1  
Cost Method Investments $ 3.6   $ 1.6  
Number of operating segments | segment 1      
Available for sale accrued interest receivable $ 3.9      
Financing receivable accrued interest receivable $ 15.6      
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%