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LOANS (COVID-19 Loan Modifications) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 USD ($)
Loans and Leases Receivable Disclosure [Line Items] |  |
Number of TDR loans during the period | 0 |
COVID 19 - Impact |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Number of TDR loans during the period |  | 1
Loan restructuring amount |  | $ 20.8
Percentage of loans receivable |  | 0.43%

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- Definition Number of financing receivables (excluding accrued interest) that have been modified by troubled debt restructurings. + References No definition available. + Details
Name: | mcb_FinancingReceivableExcludingAccruedInterestModificationsNumberOfContracts
Namespace Prefix: | mcb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of loans and leases receivable modified. + References No definition available. + Details
Name: | mcb_PercentageOfLoansAndLeasesReceivableModified
Namespace Prefix: | mcb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of financing receivable modified on trial basis. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-33 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |