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NET LOANS RECEIVABLE - Summary of Net Loans Receivable (Details) - USD ($)	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Jun. 30, 2021
NET LOANS RECEIVABLE
Gross loans receivable	$ 1,038,237,000	$ 1,001,647,000
Net deferred loan costs	3,968,000	3,443,000
Allowance for loan losses	(22,569,000)	(22,524,000)	$ (23,071,000)	$ (23,259,000)
Net loans receivable	1,019,636,000	982,566,000
Commercial
NET LOANS RECEIVABLE
Gross loans receivable	633,600,000	627,847,000
Allowance for loan losses	(17,055,000)	(17,818,000)	(18,273,000)	(18,300,000)
Commercial \| Real estate
NET LOANS RECEIVABLE
Gross loans receivable	459,951,000	453,549,000
Commercial \| Commercial and industrial
NET LOANS RECEIVABLE
Gross loans receivable	97,485,000	103,197,000
Commercial \| Construction
NET LOANS RECEIVABLE
Gross loans receivable	76,164,000	71,101,000
Residential mortgages
NET LOANS RECEIVABLE
Gross loans receivable	302,579,000	270,268,000
Allowance for loan losses	(3,736,000)	(2,899,000)	(3,080,000)	(3,224,000)
Home equity loans
NET LOANS RECEIVABLE
Gross loans receivable	81,994,000	81,238,000
Allowance for loan losses	(1,358,000)	(1,388,000)	(1,344,000)	(1,295,000)
Consumer
NET LOANS RECEIVABLE
Gross loans receivable	20,064,000	22,294,000
Allowance for loan losses	(420,000)	(419,000)	$ (374,000)	$ (440,000)
PPP Loans \| Commercial \| Commercial and industrial
NET LOANS RECEIVABLE
Gross loans receivable	$ 191,000	$ 1,800,000