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INVESTMENT SECURITIES (Proceeds from sales and calls of securities and associated gains and losses) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
INVESTMENT SECURITIES |  |
Proceeds from sale of securities available for sale, amortized cost | $ 0 | $ 0

X
- Definition Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), amortized cost. + References No definition available. + Details
Name: | mcb_ProceedsFromSaleAndMaturityOfAvailableForSaleSecuritiesAmortizedCost
Namespace Prefix: | mcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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