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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
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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
Name: | ecbk_AmountOfNonAccuralLoansNotFormallyRated
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