NET LOANS RECEIVABLE - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Allowance for loan losses
Allowance for loan losses at beginning of period		$ 22,469	$ 22,469	$ 22,524
Loans charged off				(233)
Recoveries on loans charged off				178
Allowance for loan losses at end of period				22,469
Allowance for credit losses - loans
Beginning Balance	$ 21,801
Provisions	(25)	1,575	2,163
Charge-offs	(256)	(426)	(610)
Recoveries	234	55	90
Ending Balance	21,754	21,362	21,801
Liabilities for off-balance sheet credit exposures
Beginning Balance	1,899
Provisions	291	57	275
Ending Balance	2,190	1,681	1,899
Total allowance for credit losses
Beginning Balance	23,700	22,469	22,469
Provisions	266	1,632	2,438
Charge-offs	(256)	(426)	(610)
Recoveries	234	55	90
Ending Balance	23,944	23,043	23,700	22,469
Cumulative effect of change in accounting principle - Current Expected Credit Losses
Allowance for loan losses
Allowance for loan losses at beginning of period		(2,311)	(2,311)
Allowance for loan losses at end of period				(2,311)
Liabilities for off-balance sheet credit exposures
Beginning Balance		1,624	1,624
Ending Balance				1,624
Total allowance for credit losses
Beginning Balance		(687)	(687)
Ending Balance				(687)
Commercial
Allowance for loan losses
Allowance for loan losses at beginning of period		14,288	14,288	17,818
Provision charged to operations				(3,567)
Loans charged off				(41)
Recoveries on loans charged off				78
Allowance for loan losses at end of period				14,288
Allowance for credit losses - loans
Beginning Balance	12,504
Provisions	(540)	(5)	(205)
Charge-offs	(111)	(345)	(345)
Recoveries	214	43	73
Ending Balance	12,067	12,674	12,504
Commercial | Cumulative effect of change in accounting principle - Current Expected Credit Losses
Allowance for loan losses
Allowance for loan losses at beginning of period		(1,307)	(1,307)
Allowance for loan losses at end of period				(1,307)
Residential mortgages
Allowance for loan losses
Allowance for loan losses at beginning of period		6,222	6,222	2,899
Provision charged to operations				3,283
Loans charged off				(26)
Recoveries on loans charged off				66
Allowance for loan losses at end of period				6,222
Allowance for credit losses - loans
Beginning Balance	7,706
Provisions	269	1,418	2,272
Charge-offs	(45)		(118)
Ending Balance	7,930	6,970	7,706
Residential mortgages | Cumulative effect of change in accounting principle - Current Expected Credit Losses
Allowance for loan losses
Allowance for loan losses at beginning of period		(670)	(670)
Allowance for loan losses at end of period				(670)
Home equity loans and lines of credit
Allowance for loan losses
Allowance for loan losses at beginning of period		1,470	1,470	1,388
Provision charged to operations				76
Loans charged off				(8)
Recoveries on loans charged off				14
Allowance for loan losses at end of period				1,470
Allowance for credit losses - loans
Beginning Balance	1,244
Provisions	(59)	145	48
Charge-offs		(12)	(12)
Recoveries		1	3
Ending Balance	1,185	1,339	1,244
Home equity loans and lines of credit | Cumulative effect of change in accounting principle - Current Expected Credit Losses
Allowance for loan losses
Allowance for loan losses at beginning of period		(265)	(265)
Allowance for loan losses at end of period				(265)
Consumer
Allowance for loan losses
Allowance for loan losses at beginning of period		489	489	419
Provision charged to operations				208
Loans charged off				(158)
Recoveries on loans charged off				20
Allowance for loan losses at end of period				489
Allowance for credit losses - loans
Beginning Balance	347
Provisions	305	17	48
Charge-offs	(100)	(69)	(135)
Recoveries	20	11	14
Ending Balance	$ 572	379	347
Consumer | Cumulative effect of change in accounting principle - Current Expected Credit Losses
Allowance for loan losses
Allowance for loan losses at beginning of period		$ (69)	$ (69)
Allowance for loan losses at end of period				$ (69)