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Loans, Allowance for Credit Losses and Credit Quality - Summary of Loans by Risk Rating (Parenthetical) (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Receivables [Abstract]
Non-accural loans not formally rated	$ 51,000	$ 526,000

X

- Definition

Amount of Non accural loans not formally rated.

+ References

No definition available.

+ Details

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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