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FAIR VALUE OF FINANCIAL INSTRUMENTS - Narratives (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
FAIR VALUE OF FINANCIAL INSTRUMENTS
Assets amount transfer from level 1 to level 2	$ 0		$ 0
Assets amount transfer from level 2 to level 1	0		0
Liabilities amount transfer from level 1 to level 2	0		0
Liabilities amount transfer from level 2 to level 1	0		$ 0
Fair value assets measured at fair value on a non-recurring basis	$ 0	$ 0

X

- Definition

Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

No definition available.

+ Details

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- Definition

Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ References

No definition available.

+ Details

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Namespace Prefix:	mcb_
Data Type:	xbrli:monetaryItemType
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- Definition

Fair value assets measured at fair value on a non-recurring basis.

+ References

No definition available.

+ Details

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Namespace Prefix:	mcb_
Data Type:	xbrli:monetaryItemType
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- Definition

Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

No definition available.

+ Details

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- Definition

Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ References

No definition available.

+ Details

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Namespace Prefix:	mcb_
Data Type:	xbrli:monetaryItemType
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- References

No definition available.

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