Represents the number of additional states in which the entity is licensed to lend.

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Represents the number of full-service bank offices.

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No definition available.

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Represents the number of offices held by the entity.

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Represents the number of entity subsidiaries that are security corporations.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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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.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	9 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	Sep. 30, 2022 USD ($) item Office state	Jun. 30, 2022 USD ($)	Jan. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Number of full-service bank offices \| item	31
Allowance for loan losses	$ 44,621,000	$ 43,560,000		$ 45,377,000	$ 47,988,000	$ 51,273,000	$ 55,395,000
Retained earnings	350,049,000			325,699,000
Unfunded Commitment
Increase in ACL for unfunded commitments	5,502,000	5,096,000
Consumer loans
Allowance for loan losses	247,000	327,000		$ 367,000	$ 348,000	$ 853,000	$ 2,475,000
Consumer loans \| Unfunded Commitment
Increase in ACL for unfunded commitments	$ 11,000	$ 15,000
HarborOne Mortgage
Number of offices \| Office	26
Additional states licensed to lend \| state	6
Cumulative Effect, Period of Adoption, Adjustment \| ASU 2016-13
Allowance for loan losses	$ (1,311,000)		$ (1,300,000)
Cumulative Effect, Period of Adoption, Adjustment \| ASU 2016-13 \| Unfunded Commitment
Increase in ACL for unfunded commitments	3,931,000		3,900,000
Retained earnings			(1,900,000)
Net deferred tax asset balance			$ 737,000
Cumulative Effect, Period of Adoption, Adjustment \| ASU 2016-13 \| Consumer loans
Allowance for loan losses	123,000
Cumulative Effect, Period of Adoption, Adjustment \| ASU 2016-13 \| Consumer loans \| Unfunded Commitment
Increase in ACL for unfunded commitments	$ 14,000
HarborOne Bank.
Number of security corporation subsidiaries \| item	1