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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, 2022	Dec. 31, 2021	Dec. 31, 2020
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Proceeds from Sales and Calls of Securities	$ 0.0	$ 43.2	$ 141.4

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