DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Cumulative basis adjustment for fair value hedges (Details) - Designated as hedging instruments - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Available-for-sale - Municipals
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES
Closed Portfolio Amount	$ 50,731	$ 50,964
Cumulative amount of fair value hedging adjustment included in the carrying amount of assets	(1,467)	(1,230)
Available-for-sale - MBS
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES
Closed Portfolio Amount	33,565	35,806
Cumulative amount of fair value hedging adjustment included in the carrying amount of assets	(484)	(407)
Interest rate swaps
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES
Closed Portfolio Amount	223,122	86,770
Interest rate swaps notional amount	125,000	50,000
Cumulative amount of fair value hedging adjustment included in the carrying amount of assets	(1,951)	(1,637)
Loans | Interest rate swaps
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES
Closed Portfolio Amount	$ 138,826	0
Cumulative amount of fair value hedging adjustment included in the carrying amount of assets		$ 0