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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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Namespace Prefix: | mcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | mcb_FairValueAssetsLevel2ToLevel1TransfersAmounts
Namespace Prefix: | mcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | mcb_FairValueLiabilitiesLevel1ToLevel2TransfersAmounts
Namespace Prefix: | mcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Balance Type: | debit
Period Type: | instant

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