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LOANS AND ALLOWANCE FOR CREDIT LOSSES (Types of Modifications) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, modified in 12 months prior and default in the period	$ 7.0	$ 0.0
Maximum | Extension | Real Estate | Multi-family
Loans and Leases Receivable Disclosure [Line Items]
Term Extension	12 months
Minimum | Extension | Real Estate | Multi-family
Loans and Leases Receivable Disclosure [Line Items]
Term Extension	6 months

X

- Definition

Amount of financing receivable that was modified in 12 months prior and now default during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	mcb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A

+ Details

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Period Type:	duration

X

- 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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- Details

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X

- Details

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X

- Details

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X

- Details

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- Details

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