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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	3 Months Ended
	Mar. 31, 2025 state item	Apr. 24, 2025 $ / shares
Number of full-service bank offices | item	30
HarborOne Mortgage
Additional states licensed to lend | state	5
Eastern Bankshares, Inc | HarborOne Bancorp, Inc. | Subsequent event
Conversion ratio		0.765
Cash consideration | $ / shares		$ 12
Eastern Bankshares, Inc | HarborOne Bancorp, Inc. | Minimum | Subsequent event
Common stock, outstanding (as percent)		75.00%
Eastern Bankshares, Inc | HarborOne Bancorp, Inc. | Maximum | Subsequent event
Common stock, outstanding (as percent)		85.00%

X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

Ratio applied to the conversion of stock in a business acquisition.

+ References

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+ Details

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X

- Definition

Represents the number of full-service bank offices.

+ References

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+ Details

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X

- Definition

Represents total shares of company's common stock outstanding immediately prior to the merger that will receive the stock consideration.

+ References

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- Definition

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

+ References

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+ Details

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X

- Details

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- Details

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- Details

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