DERIVATIVES AND HEDGING ACTIVITIES - Cash Flow Hedges (Details) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Feb. 28, 2023	Jul. 31, 2022	Mar. 31, 2022	Oct. 31, 2018
DERIVATIVES AND HEDGING ACTIVITIES
USD-Prime rate		8.50%
USD-SOFR OIS rate		5.3224%
Non-interest income related to changes in the fair value		$ 0	$ 0
Interest rate swaps | Cash flow hedges
DERIVATIVES AND HEDGING ACTIVITIES
Total notional amount of the swaps							$ 300,000,000	$ 400,000,000
Derivative, fixed interest rate							1.6725%	3.018%
Terminated notional amount of derivatives	$ 400,000,000
Expected interest income on termination	$ 45,900,000
Loan interest income on terminated interest rate swap		2,000,000.0	2,000,000.0
Terminated interest rate swap		1,900,000	$ 2,200,000
Interest rate swaps | Fair Value Hedges
DERIVATIVES AND HEDGING ACTIVITIES
Total notional amount of the swaps					$ 95,000,000
Derivative, fixed interest rate					4.65%
Interest rate swap one | Cash flow hedges
DERIVATIVES AND HEDGING ACTIVITIES
Derivative, fixed interest rate						2.628%
Interest rate swap two | Cash flow hedges
DERIVATIVES AND HEDGING ACTIVITIES
Total notional amount of the swaps						$ 200,000,000
Derivative, fixed interest rate						5.725%
July 2022 interest rate swaps | Cash flow hedges
DERIVATIVES AND HEDGING ACTIVITIES
Loan interest income expense		$ 2,800,000		$ 0