DERIVATIVES AND HEDGING ACTIVITIES - Cash Flow Hedges Narrative (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) DerivativeInstrument	Mar. 31, 2021 USD ($) DerivativeInstrument	Dec. 31, 2021 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Estimated reclassification as a decrease to interest expense during next twelve months	$ 1,700,000
Number of derivatives terminated | DerivativeInstrument	0	34
Collateral from its third-party counterparties under the agreements in a net asset position	$ 11,300,000
Termination value of derivatives	$ 0	$ 785,000,000.0
Collateral received against obligations in net asset position			$ 4,600,000
Non-interest income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on termination of derivatives		$ (16,500,000)