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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%

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