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DERIVATIVES - Outstanding notional balances and fair values of outstanding derivative instruments (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2023
Other assets
Derivative disclosures
Fair Value, Assets	$ 20,070,000	$ 24,929,000
Other liabilities
Derivative disclosures
Fair Value, Liabilities	19,422,000	23,546,000
Designated as hedging instruments \| Other assets
Derivative disclosures
Fair Value, Assets	76,000	1,152,000
Designated as hedging instruments \| Other liabilities
Derivative disclosures
Fair Value, Liabilities	455,000	84,000
Not designated as hedging instruments \| Other assets
Derivative disclosures
Fair Value, Assets	19,994,000	23,777,000
Not designated as hedging instruments \| Other liabilities
Derivative disclosures
Fair Value, Liabilities	18,967,000	23,462,000
Derivative loan commitments \| Not designated as hedging instruments
Derivative disclosures
Notional Amount	41,938,000	38,929,000
Derivative loan commitments \| Not designated as hedging instruments \| Other assets
Derivative disclosures
Fair Value, Assets	540,000	374,000
Derivative loan commitments \| Not designated as hedging instruments \| Other liabilities
Derivative disclosures
Fair Value, Liabilities	54,000	61,000
Forward loan sale commitments \| Not designated as hedging instruments
Derivative disclosures
Notional Amount	28,500,000	50,500,000
Forward loan sale commitments \| Not designated as hedging instruments \| Other assets
Derivative disclosures
Fair Value, Assets	9,000	382,000
Forward loan sale commitments \| Not designated as hedging instruments \| Other liabilities
Derivative disclosures
Fair Value, Liabilities	63,000	4,000
Interest rate swaps \| Designated as hedging instruments \| Fair value hedge
Derivative disclosures
Notional Amount	100,000,000	100,000,000	$ 100,000,000
Interest rate swaps \| Designated as hedging instruments \| Cashflow hedge
Derivative disclosures
Notional Amount	100,000,000	100,000,000
Fair Value, Assets	76,000
Interest rate swaps \| Designated as hedging instruments \| Other assets \| Fair value hedge
Derivative disclosures
Fair Value, Assets		112,000
Interest rate swaps \| Designated as hedging instruments \| Other assets \| Cashflow hedge
Derivative disclosures
Fair Value, Assets	76,000	1,040,000
Interest rate swaps \| Designated as hedging instruments \| Other liabilities \| Fair value hedge
Derivative disclosures
Fair Value, Liabilities	455,000	84,000
Interest rate swaps \| Not designated as hedging instruments
Derivative disclosures
Notional Amount	980,343,000	1,015,448,000
Interest rate swaps \| Not designated as hedging instruments \| Other assets
Derivative disclosures
Fair Value, Assets	18,850,000	23,021,000
Interest rate swaps \| Not designated as hedging instruments \| Other liabilities
Derivative disclosures
Fair Value, Liabilities	18,850,000	23,021,000
Risk participation agreements \| Not designated as hedging instruments
Derivative disclosures
Notional Amount	215,355,000	216,245,000
Interest Rate Futures \| Not designated as hedging instruments
Derivative disclosures
Notional Amount	31,600,000	35,400,000
Interest Rate Futures \| Not designated as hedging instruments \| Other assets
Derivative disclosures
Fair Value, Assets	$ 595,000
Interest Rate Futures \| Not designated as hedging instruments \| Other liabilities
Derivative disclosures
Fair Value, Liabilities		$ 376,000