COMMITMENTS AND CONTINGENCIES - Summary Of Financial Instruments And Outstanding Amounts Represent Credit Risk (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Jun. 30, 2021
Commitments to grant loans
Loan Commitments [Line Items]
Off-Balance-Sheet, Credit Loss, Liability	$ 5,551	$ 1,460
Unadvanced funds on construction loans
Loan Commitments [Line Items]
Off-Balance-Sheet, Credit Loss, Liability	460	0
Unadvanced funds on commercial and other lines of credit
Loan Commitments [Line Items]
Off-Balance-Sheet, Credit Loss, Liability	1,188	1,422
Unadvanced funds on equity lines of credit
Loan Commitments [Line Items]
Off-Balance-Sheet, Credit Loss, Liability	$ 4,305	$ 4,237

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82919202-210446

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