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BORROWINGS - Junior Subordinated Deferrable Interest Debentures (Details) - Junior Subordinated Debt [Member] - Floating Rate Junior Subordinated Deferrable Interest Debentures [Member] - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term Debt	$ 8.4	$ 8.3
Debt, Weighted Average Interest Rate	2.70%	2.80%
Debt Instrument, Term	30 years

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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