DESCRIPTION OF THE PLAN (Details) - EBP 002	12 Months Ended
Dec. 31, 2025 USD ($) loan yr h
EBP, Description of Plan [Line Items]
Requisite age for participation \| yr	21
Requisite service period for participation	90 days
Requisite service period for safe harbor nonelective contributions	1 year
Requisite age for safe harbor nonelective contributions \| yr	21
Full-time employee, hours threshold \| h	1,000
Eligibility service period	12 months
Eligibility service period, hours threshold \| h	1,000
Minimum annual compensation to total compensation, percentage	1.00%
Maximum annual compensation to total compensation, percentage	75.00%
Automatic deferral rate	3.00%
Automatic deferral refund period	90 days
Note receivable from participant, account, minimum borrowing, amount \| $	$ 1,000
Note receivable from participant, account, maximum borrowing, amount \| $	$ 50,000
Note receivable from participant, account, maximum borrowing, to total account, percentage	50.00%
Note receivable from participant, general loan, maximum borrowing term	5 years
Note receivable from participant, account, primary residence, maximum borrowing term	10 years
Maximum number of loans outstanding per participant \| loan	2
Participant loan, basis spread on variable rate	1.00%
Minimum
EBP, Description of Plan [Line Items]
Participant loan interest rate	4.25%
Maximum
EBP, Description of Plan [Line Items]
Participant loan interest rate	9.50%

EBP, Eligibility Service Period

No definition available.

Name:	ebc_EBPEligibilityServicePeriod
Namespace Prefix:	ebc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Eligibility Service Period, Hours Threshold

+ References

No definition available.

+ Details

Name:	ebc_EBPEligibilityServicePeriodHoursThreshold
Namespace Prefix:	ebc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Full-Time Employee, Hours Threshold

+ References

No definition available.

+ Details

Name:	ebc_EBPFullTimeEmployeeHoursThreshold
Namespace Prefix:	ebc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term

+ References

No definition available.

+ Details

Name:	ebc_EBPNoteReceivableFromParticipantAccountPrimaryResidenceMaximumBorrowingTerm
Namespace Prefix:	ebc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term

+ References

No definition available.

+ Details

Name:	ebc_EBPNoteReceivableFromParticipantGeneralLoanMaximumBorrowingTerm
Namespace Prefix:	ebc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Participant Contribution, Automatic, Deferral Refund Period

+ References

No definition available.

+ Details

Name:	ebc_EBPParticipantContributionAutomaticDeferralRefundPeriod
Namespace Prefix:	ebc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Participant Contribution, Maximum Annual Compensation To Total Compensation, Percentage

+ References

No definition available.

+ Details

Name:	ebc_EBPParticipantContributionMaximumAnnualCompensationToTotalCompensationPercentage
Namespace Prefix:	ebc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Participant Contribution, Minimum Annual Compensation To Total Compensation, Percentage

+ References

No definition available.

+ Details

Name:	ebc_EBPParticipantContributionMinimumAnnualCompensationToTotalCompensationPercentage
Namespace Prefix:	ebc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Participant Loan, Basis Spread On Variable Rate

+ References

No definition available.

+ Details

Name:	ebc_EBPParticipantLoanBasisSpreadOnVariableRate
Namespace Prefix:	ebc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Participant Loan, Maximum Number Of Loans Outstanding Per Participant

+ References

No definition available.

+ Details

Name:	ebc_EBPParticipantLoanMaximumNumberOfLoansOutstandingPerParticipant
Namespace Prefix:	ebc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Requisite Age For Participation

+ References

No definition available.

+ Details

Name:	ebc_EBPRequisiteAgeForParticipation
Namespace Prefix:	ebc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Requisite Age For Safe Harbor Nonelective Contributions

+ References

No definition available.

+ Details

Name:	ebc_EBPRequisiteAgeForSafeHarborNonelectiveContributions
Namespace Prefix:	ebc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Requisite Service Period For Participation

+ References

No definition available.

+ Details

Name:	ebc_EBPRequisiteServicePeriodForParticipation
Namespace Prefix:	ebc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Requisite Service Period For Safe Harbor Nonelective Contributions

+ References

No definition available.

+ Details

Name:	ebc_EBPRequisiteServicePeriodForSafeHarborNonelectiveContributions
Namespace Prefix:	ebc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow to total participant account balance.

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of minimum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Interest rate on participant loan in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)(i)(D)
-Publisher DOL-EBSA

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule I))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=ebc_EBP002Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: