DERIVATIVES - Cumulative basis adjustment for fair value hedges (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Fair Value Hedging | Designated as hedging instruments
Derivative disclosures
Carrying Amount of the Hedged Assets	$ 99,464,000	$ 100,855,000
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets	$ (536,000)	$ 855,000
Interest rate swaps
Derivative disclosures
Hedged Asset, Statement of Financial Position [Extensible Enumeration]	Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss
Interest rate swaps | Fair Value Hedging | Designated as hedging instruments
Derivative disclosures
Carrying Amount of the Hedged Assets	$ 99,464,000	$ 100,855,000
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets	(536,000)	$ 855,000
Amortized cost	1,200,000,000
Designated amount of hedged items	$ 100,000,000.0