COMMITMENTS AND CONTINGENCIES - Summary Of Financial Instruments And Outstanding Amounts Represent Credit Risk (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Jun. 30, 2022
Commitments to grant loans
Loan Commitments [Line Items]
Off-Balance-Sheet, Credit Loss, Liability	$ 608	$ 5,551
Unadvanced funds on construction loans
Loan Commitments [Line Items]
Off-Balance-Sheet, Credit Loss, Liability	0	460
Unadvanced funds on commercial and other lines of credit
Loan Commitments [Line Items]
Off-Balance-Sheet, Credit Loss, Liability	871	1,188
Unadvanced funds on equity lines of credit
Loan Commitments [Line Items]
Off-Balance-Sheet, Credit Loss, Liability	$ 4,089	$ 4,305

Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482454/460-10-45-1

Name:	us-gaap_OffBalanceSheetCreditLossLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant