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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
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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