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DERIVATIVES - Outstanding notional balances and fair values of outstanding derivative instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023
Other assets
Derivative disclosures
Fair Value, Assets	$ 31,006	$ 28,824
Other liabilities
Derivative disclosures
Fair Value, Liabilities	25,415	24,551
Designated as hedging instruments \| Other assets
Derivative disclosures
Fair Value, Assets	5,144	5,095
Designated as hedging instruments \| Other liabilities
Derivative disclosures
Fair Value, Liabilities		855
Not designated as hedging instruments \| Other assets
Derivative disclosures
Fair Value, Assets	25,862	23,729
Not designated as hedging instruments \| Other liabilities
Derivative disclosures
Fair Value, Liabilities	25,415	23,696
Derivative loan commitments \| Not designated as hedging instruments
Derivative disclosures
Notional Amount	34,819	30,165
Derivative loan commitments \| Not designated as hedging instruments \| Other assets
Derivative disclosures
Fair Value, Assets	397	480
Derivative loan commitments \| Not designated as hedging instruments \| Other liabilities
Derivative disclosures
Fair Value, Liabilities	18	158
Forward loan sale commitments \| Not designated as hedging instruments
Derivative disclosures
Notional Amount	37,000	30,000
Forward loan sale commitments \| Not designated as hedging instruments \| Other assets
Derivative disclosures
Fair Value, Assets	52	4
Forward loan sale commitments \| Not designated as hedging instruments \| Other liabilities
Derivative disclosures
Fair Value, Liabilities	32	293
Interest rate swaps \| Designated as hedging instruments \| Fair value hedge
Derivative disclosures
Notional Amount	100,000	100,000	$ 100,000
Interest rate swaps \| Designated as hedging instruments \| Cashflow hedge
Derivative disclosures
Notional Amount	100,000	100,000
Fair Value, Assets	4,600
Interest rate swaps \| Designated as hedging instruments \| Other assets \| Fair value hedge
Derivative disclosures
Fair Value, Assets	565
Interest rate swaps \| Designated as hedging instruments \| Other assets \| Cashflow hedge
Derivative disclosures
Fair Value, Assets	4,579	5,095
Interest rate swaps \| Designated as hedging instruments \| Other liabilities \| Fair value hedge
Derivative disclosures
Fair Value, Liabilities		855
Interest rate swaps \| Not designated as hedging instruments
Derivative disclosures
Notional Amount	877,905	863,348
Interest rate swaps \| Not designated as hedging instruments \| Other assets
Derivative disclosures
Fair Value, Assets	25,365	23,245
Interest rate swaps \| Not designated as hedging instruments \| Other liabilities
Derivative disclosures
Fair Value, Liabilities	25,365	23,245
Interest rate futures \| Not designated as hedging instruments
Derivative disclosures
Notional Amount	32,000
Interest rate futures \| Not designated as hedging instruments \| Other assets
Derivative disclosures
Fair Value, Assets	48
Risk participation agreements \| Not designated as hedging instruments
Derivative disclosures
Notional Amount	$ 202,967	$ 189,275