SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions	3 Months Ended	6 Months Ended
Dec. 31, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jan. 31, 2020
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 0.3	$ 0.2
Proportional Amortization Investments	28.1	27.3
Cost Method Investments	1.6	$ 3.6
Number of operating segments \| segment		1
Available for sale accrued interest receivable		$ 4.2
Financing receivable accrued interest receivable		$ 14.8
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%

Financing Receivable, Accrued Interest, Allowance for Credit Loss

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Proportional Amortization Investments

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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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Amount, after allowance for credit loss, of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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