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BORROWINGS - Long-term Borrowings (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Federal Home Loan Bank Advance, ten-year, putable six-month Bermudan fixed-rate, Due March 4, 2030 |  |
Debt Instrument [Line Items] |  |
Debt instrument, term | 10 years |
Debt instrument, interest rate, stated percentage (as a percent) | 0.39% |
Federal Home Loan Bank Advances |  |
Debt Instrument [Line Items] |  |
Long-term Federal Home Loan Bank advances | $ 75.0 | $ 75.0

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