DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Cumulative basis adjustment for fair value hedges (Details) - Designated as hedging instruments - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Available-for-sale - Municipals
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES
Closed Portfolio Amount	$ 50,254	$ 50,335
Cumulative amount of fair value hedging adjustment included in the carrying amount of assets	675	993
Available-for-sale - MBS
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES
Closed Portfolio Amount	75,080	76,830
Cumulative amount of fair value hedging adjustment included in the carrying amount of assets	594	940
Interest rate swaps
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES
Closed Portfolio Amount	240,588	247,322
Interest rate swaps notional amount	170,519	171,646
Cumulative amount of fair value hedging adjustment included in the carrying amount of assets	1,319	1,586
Loans | Interest rate swaps
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES
Closed Portfolio Amount	115,254	120,157
Cumulative amount of fair value hedging adjustment included in the carrying amount of assets	$ 50	$ (347)