DERIVATIVES AND HEDGING ACTIVITIES - Fair Value Hedges Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
DERIVATIVES AND HEDGING ACTIVITIES
Interest income from swap transaction			$ 0
Fair value hedges | Designated as Hedging Instrument
DERIVATIVES AND HEDGING ACTIVITIES
Clearing house related to the fair value derivatives	$ 5,600,000	$ 5,600,000		$ 6,500,000
Fair value hedges | Interest Rate Swaps | Designated as Hedging Instrument
DERIVATIVES AND HEDGING ACTIVITIES
Average fixed interest rate	4.82%	4.82%
Mortgage loans - Amortized Cost	$ 700,500,000	$ 700,500,000		729,500,000
Last-of-layer in the open hedge relationship	500,000,000.0	500,000,000.0		500,000,000.0
Basis adjustment associated with the hedge	5,700,000	5,700,000		$ 6,600,000
Interest income from swap transaction	$ 600,000	$ 1,900,000