MINIMUM REGULATORY CAPITAL REQUIREMENTS (Details) $ in Thousands	3 Months Ended
Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations
Common equity Tier 1 capital conversation buffer ratio	0.025
Applicable capital conversation buffer ratio	0.025
Common equity Tier 1 capital to risk-weighted assets
Actual, Capital amount	$ 562,181		$ 565,319
Actual, Ratio	0.119		0.118
Minimum Required for Capital Adequacy Purposes	$ 213,244		$ 215,789
Minimum Required for Capital Adequacy Purposes, ratio	0.045		0.045
Tier 1 capital to risk weighted assets
Actual, Capital amount	$ 562,181		$ 565,319
Actual, Ratio	0.119		0.118
Minimum Required for Capital Adequacy Purposes	$ 284,325		$ 287,718
Minimum Required for Capital Adequacy Purposes, ratio	0.06		0.06
Total capital to risk-weighted assets
Actual, Capital amount	$ 614,504		$ 624,926
Actual, Ratio	0.13		0.13
Minimum Required for Capital Adequacy Purposes	$ 379,100		$ 383,624
Minimum Required for Capital Adequacy Purposes, ratio	0.08		0.08
Tier 1 capital to average assets
Actual, Capital amount	$ 562,181		$ 565,319
Actual, Ratio	0.098		0.098
Minimum Required for Capital Adequacy Purposes	$ 228,390		$ 229,865
Minimum Required for Capital Adequacy Purposes , ratio	0.04		0.04
Treasury Stock
Treasury stock, value	$ 6,378	$ 6,263
HarborOne Bank
Common equity Tier 1 capital to risk-weighted assets
Actual, Capital amount	$ 525,104		$ 528,185
Actual, Ratio	0.111		0.11
Minimum Required for Capital Adequacy Purposes	$ 213,251		$ 215,846
Minimum Required for Capital Adequacy Purposes, ratio	0.045		0.045
Minimum Required to be Considered "Well Capitalized" Under Prompt Corrective Action Provisions	$ 308,030		$ 311,778
Minimum Required to be Considered "Well Capitalized" Under Prompt Corrective Action Provisions, ratio	0.065		0.065
Tier 1 capital to risk weighted assets
Actual, Capital amount	$ 525,104		$ 528,185
Actual, Ratio	0.111		0.11
Minimum Required for Capital Adequacy Purposes	$ 284,335		$ 287,795
Minimum Required for Capital Adequacy Purposes, ratio	0.06		0.06
Minimum Required to be Considered "Well Capitalized" Under Prompt Corrective Action Provisions	$ 379,113		$ 383,727
Minimum Required to be Considered "Well Capitalized" Under Prompt Corrective Action Provisions, ratio	0.08		0.08
Total capital to risk-weighted assets
Actual, Capital amount	$ 577,427		$ 587,792
Actual, Ratio	0.122		0.123
Minimum Required for Capital Adequacy Purposes	$ 379,113		$ 383,727
Minimum Required for Capital Adequacy Purposes, ratio	0.08		0.08
Minimum Required to be Considered "Well Capitalized" Under Prompt Corrective Action Provisions	$ 473,892		$ 479,659
Minimum Required to be Considered "Well Capitalized" Under Prompt Corrective Action Provisions, ratio	0.10		0.10
Tier 1 capital to average assets
Actual, Capital amount	$ 525,104		$ 528,185
Actual, Ratio	0.092		0.092
Minimum Required for Capital Adequacy Purposes	$ 228,360		$ 229,836
Minimum Required for Capital Adequacy Purposes , ratio	0.04		0.04
Minimum Required to be Considered "Well Capitalized" Under Prompt Corrective Action Provisions	$ 285,450		$ 287,295
Minimum Required to be Considered "Well Capitalized" Under Prompt Corrective Action Provisions, ratio	0.05		0.05

Percentage requirement for a common equity Tier 1 capital conservation buffer.

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Tier 1 Risk Based Capital, as defined in the regulations, attributable to common shares.

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Amount of total capital as defined by regulatory framework.

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Amount of minimum total risk-based capital required for capital adequacy as defined by regulatory framework.

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Amount of Tier 1 leverage capital as defined by regulatory framework.

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