COMMITMENTS AND CONTINGENCIES (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Deposits with other financial institutions	$ 176.5	$ 290.5
Uninsured deposits with other financial institutions	19.7	36.4
Reserve for Off-balance Sheet Activities
Off-balance sheet credit risks, amount, liability	13.6	10.8
Cash Flow Hedging
Deposits with other financial institutions serves as collateral for cash flow hedge	$ 153.8	$ 251.0