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Loans, Allowance for Credit Losses and Credit Quality - Schedule of Information Regarding Allowance for Loan Losses (Parenthetical) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Receivables [Abstract]
Accrued interest receivable excluded from amortized cost	$ 3.8	$ 3.5

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- Definition

Accrued interest receivable excluded from amortized cost.

+ References

No definition available.

+ Details

Name:	ecbk_AccruedInterestReceivableExcludedFromAmortizedCost
Namespace Prefix:	ecbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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