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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Proceeds from sales and calls of securities and associated gains and losses) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) |  |  |
Proceeds from sales and calls of securities | $ 0 | $ 0 | $ 0

X
- Definition The amount of cash inflow from sales and calls of securities. + References No definition available. + Details
Name: | mcb_ProceedsFromSalesAndCallsOfSecurities
Namespace Prefix: | mcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration