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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Proceeds from sales and calls of securities and associated gains and losses) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) |  |  |
Proceeds from Sales and Calls of Securities | $ 0.0 | $ 0.0 | $ 43.2

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

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