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NET LOANS RECEIVABLE - Summary of Net Loans Receivable (Details) - USD ($)	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021
NET LOANS RECEIVABLE
Gross loans receivable	$ 1,065,341,000		$ 1,001,647,000
Net deferred loan costs	4,961,000		3,443,000
Allowance for loan losses	(22,192,000)	$ (22,570,000)	(22,524,000)	$ (22,638,000)	$ (23,071,000)	$ (23,259,000)
Net loans receivable	1,048,110,000		982,566,000
Commercial
NET LOANS RECEIVABLE
Gross loans receivable	607,175,000		627,847,000
Allowance for loan losses	(15,703,000)	(17,053,000)	(17,818,000)	(17,650,000)	(18,273,000)	(18,300,000)
Commercial \| Real estate
NET LOANS RECEIVABLE
Gross loans receivable	422,579,000		453,549,000
Commercial \| Commercial and industrial
NET LOANS RECEIVABLE
Gross loans receivable	100,638,000		103,197,000
Commercial \| Construction
NET LOANS RECEIVABLE
Gross loans receivable	83,958,000		71,101,000
Residential mortgages
NET LOANS RECEIVABLE
Gross loans receivable	352,715,000		270,268,000
Allowance for loan losses	(4,533,000)	(3,737,000)	(2,899,000)	(3,223,000)	(3,080,000)	(3,224,000)
Home equity loans
NET LOANS RECEIVABLE
Gross loans receivable	86,762,000		81,238,000
Allowance for loan losses	(1,473,000)	(1,358,000)	(1,388,000)	(1,347,000)	(1,344,000)	(1,295,000)
Consumer
NET LOANS RECEIVABLE
Gross loans receivable	18,689,000		22,294,000
Allowance for loan losses	(483,000)	$ (422,000)	(419,000)	$ (418,000)	$ (374,000)	$ (440,000)
PPP Loans \| Commercial \| Commercial and industrial
NET LOANS RECEIVABLE
Gross loans receivable	$ 180,000		$ 1,800,000