SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions		3 Months Ended	9 Months Ended
Dec. 31, 2019 USD ($) segment	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) segment	Jan. 31, 2020
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 0.2	$ 0.2	$ 0.2
Proportional Amortization Investments	15.3	28.4	28.4
Cost Method Investments	$ 1.6	1.6	$ 1.6
Number of operating segments \| segment	3		1
Available for sale accrued interest receivable		4.2	$ 4.2
Financing receivable accrued interest receivable		17.3	$ 17.3
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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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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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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