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Commitments and Contingencies - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Maximum potential amount of bank obligation	$ 50,000		$ 50,000
Letter of credit outstanding term	1 year
Allowance for off balance sheet loan losses	$ 618,000		$ 634,000
Provision (benefit) for off-balance sheet commitments	$ 16,000	$ 68,000

X

- Definition

Allowance for off balance sheet loan losses.

+ References

No definition available.

+ Details

Name:	ecbk_AllowanceForOffBalanceSheetLoanLosses
Namespace Prefix:	ecbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Letter of credit outstanding term.

+ References

No definition available.

+ Details

Name:	ecbk_LetterOfCreditOutstandingTerm
Namespace Prefix:	ecbk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum potential amount of bank obligation.

+ References

No definition available.

+ Details

Name:	ecbk_MaximumPotentialAmountOfBankObligation
Namespace Prefix:	ecbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

+ Details

Name:	us-gaap_OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration