LOANS RECEIVABLE - Troubled Debt Restructurings of Loans Receivable (Details) $ in Thousands	3 Months Ended					9 Months Ended
	Mar. 31, 2023 USD ($) loan	Mar. 31, 2023 USD ($)	Mar. 31, 2023 USD ($) Loan	Jun. 30, 2022 USD ($) loan	Mar. 31, 2022 USD ($) Loan	Mar. 31, 2023 USD ($) Loan	Mar. 31, 2022 USD ($) Loan
Financing Receivable Modifications [Line Items]
Number of TDR defaults	62		1	68	11	5	14
Amount	$ 17,899	$ 17,899	$ 17,899	$ 22,184		$ 17,899
Pre-modification outstanding recorded investment		67			$ 13,534	817	$ 16,782
Post-modification outstanding recorded investment		67			$ 13,543	814	$ 16,776
Accrual
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	49			43
Amount	$ 10,191	10,191	10,191	$ 8,672		10,191
Non-accrual
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	13			25
Amount	$ 7,708	7,708	7,708	$ 13,512		7,708
Commercial Portfolio Segment
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	12			16
Amount	$ 9,592	9,592	9,592	$ 12,854		9,592
Commercial Portfolio Segment | Accrual
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	8			9
Amount	$ 3,732	3,732	3,732	$ 4,020		3,732
Commercial Portfolio Segment | Non-accrual
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	4			7
Amount	$ 5,860	5,860	$ 5,860	$ 8,834		$ 5,860
Commercial Portfolio Segment | Multi-family mortgage
Financing Receivable Modifications [Line Items]
Number of TDR defaults	2		0	2	1	0	2
Amount	$ 5,470	5,470	$ 5,470	$ 5,626		$ 5,470
Pre-modification outstanding recorded investment		0			$ 9,104	0	$ 12,091
Post-modification outstanding recorded investment		0			$ 9,101	0	$ 12,073
Commercial Portfolio Segment | Multi-family mortgage | Accrual
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	0			0
Amount	$ 0	0	0	$ 0		0
Commercial Portfolio Segment | Multi-family mortgage | Non-accrual
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	2			2
Amount	$ 5,470	5,470	5,470	$ 5,626		5,470
Commercial Portfolio Segment | Nonresidential mortgage
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	4			6
Amount	$ 561	561	561	$ 1,954		561
Commercial Portfolio Segment | Nonresidential mortgage | Accrual
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	3			4
Amount	$ 177	177	177	$ 389		177
Commercial Portfolio Segment | Nonresidential mortgage | Non-accrual
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	1			2
Amount	$ 384	384	$ 384	$ 1,565		$ 384
Commercial Portfolio Segment | Commercial business
Financing Receivable Modifications [Line Items]
Number of TDR defaults	6		1	7	0	2	0
Amount	$ 3,561	3,561	$ 3,561	$ 3,713		$ 3,561
Pre-modification outstanding recorded investment		67			$ 0	74	$ 0
Post-modification outstanding recorded investment		67			$ 0	74	$ 0
Commercial Portfolio Segment | Commercial business | Accrual
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	5			5
Amount	$ 3,555	3,555	3,555	$ 3,631		3,555
Commercial Portfolio Segment | Commercial business | Non-accrual
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	1			2
Amount	$ 6	6	6	$ 82		6
Commercial Portfolio Segment | Construction
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	0			1
Amount	$ 0	0	0	$ 1,561		0
Commercial Portfolio Segment | Construction | Accrual
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	0			0
Amount	$ 0	0	0	$ 0		0
Commercial Portfolio Segment | Construction | Non-accrual
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	0			1
Amount	$ 0	0	$ 0	$ 1,561		$ 0
Residential
Financing Receivable Modifications [Line Items]
Number of TDR defaults	44		0	45	8	2	10
Amount	$ 7,916	7,916	$ 7,916	$ 7,802		$ 7,916
Pre-modification outstanding recorded investment		0			$ 2,953	708	$ 3,214
Post-modification outstanding recorded investment		0			$ 2,965	705	$ 3,226
Residential | Accrual
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	35			29
Amount	$ 6,068	6,068	6,068	$ 4,488		6,068
Residential | Non-accrual
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	9			16
Amount	$ 1,848	1,848	$ 1,848	$ 3,314		$ 1,848
Consumer Loans | Home equity loans
Financing Receivable Modifications [Line Items]
Number of TDR defaults	6		0	7	2	1	2
Amount	$ 391	391	$ 391	$ 1,528		$ 391
Pre-modification outstanding recorded investment		0			$ 1,477	35	$ 1,477
Post-modification outstanding recorded investment		0			$ 1,477	35	$ 1,477
Consumer Loans | Home equity loans | Accrual
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	6			5
Amount	$ 391	391	391	$ 164		391
Consumer Loans | Home equity loans | Non-accrual
Financing Receivable Modifications [Line Items]
Number of TDR defaults | loan	0			2
Amount	$ 0	$ 0	$ 0	$ 1,364		$ 0