XML 50 R40.htm IDEA: XBRL DOCUMENT v3.25.2

INVESTMENT SECURITIES (Schedule of Securities with Unrealized/Unrecognized Losses) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($) item	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) item	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) item
Held-to-maturity Securities
Total, Unrealized/Unrecognized Losses	$ 0		$ 0
Number of securities of one issuer | item	0		0		0
Impairment loss	$ 0	$ 0	$ 0	$ 0
Available-for-sale Securities
Available-for-sale Securities
Less than 12 Months, Estimated Fair Value	48,163		48,163		$ 66,483
Less than 12 Months, Unrealized/Unrecognized Losses	(338)		(338)		(1,514)
12 months or more, Estimated Fair Value	352,156		352,156		358,156
12 months or more, Unrealized/Unrecognized Losses	(64,645)		(64,645)		(76,334)
Total, Estimated Fair Value	400,319		400,319		424,639
Total, Unrealized/Unrecognized Losses	(64,983)		(64,983)		(77,848)
Held-to-maturity Securities
Held-to-maturity Securities
12 months or more, Estimated Fair Value	336,694		336,694		366,719
12 months or more, Unrealized/Unrecognized Losses	(51,207)		(51,207)		(61,838)
Total, Estimated Fair Value	336,694		336,694		366,719
Total, Unrealized/Unrecognized Losses	(51,207)		(51,207)		(61,838)
U.S. Government agency securities | Available-for-sale Securities
Available-for-sale Securities
12 months or more, Estimated Fair Value	65,103		65,103		63,752
12 months or more, Unrealized/Unrecognized Losses	(2,896)		(2,896)		(4,247)
Total, Estimated Fair Value	65,103		65,103		63,752
Total, Unrealized/Unrecognized Losses	(2,896)		(2,896)		(4,247)
U.S. State and Municipal securities | Available-for-sale Securities
Available-for-sale Securities
12 months or more, Estimated Fair Value	9,443		9,443		9,500
12 months or more, Unrealized/Unrecognized Losses	(1,820)		(1,820)		(1,841)
Total, Estimated Fair Value	9,443		9,443		9,500
Total, Unrealized/Unrecognized Losses	(1,820)		(1,820)		(1,841)
U.S. State and Municipal securities | Held-to-maturity Securities
Held-to-maturity Securities
12 months or more, Estimated Fair Value	12,926		12,926		13,633
12 months or more, Unrealized/Unrecognized Losses	(2,267)		(2,267)		(1,686)
Total, Estimated Fair Value	12,926		12,926		13,633
Total, Unrealized/Unrecognized Losses	(2,267)		(2,267)		(1,686)
Residential MBS | Available-for-sale Securities
Available-for-sale Securities
Less than 12 Months, Estimated Fair Value	37,453		37,453		46,859
Less than 12 Months, Unrealized/Unrecognized Losses	(299)		(299)		(1,104)
12 months or more, Estimated Fair Value	251,642		251,642		258,763
12 months or more, Unrealized/Unrecognized Losses	(57,681)		(57,681)		(67,650)
Total, Estimated Fair Value	289,095		289,095		305,622
Total, Unrealized/Unrecognized Losses	(57,980)		(57,980)		(68,754)
Residential MBS | Held-to-maturity Securities
Held-to-maturity Securities
12 months or more, Estimated Fair Value	306,564		306,564		316,366
12 months or more, Unrealized/Unrecognized Losses	(48,120)		(48,120)		(58,866)
Total, Estimated Fair Value	306,564		306,564		316,366
Total, Unrealized/Unrecognized Losses	(48,120)		(48,120)		(58,866)
Commercial MBS | Available-for-sale Securities
Available-for-sale Securities
Less than 12 Months, Estimated Fair Value	10,710		10,710		19,624
Less than 12 Months, Unrealized/Unrecognized Losses	(39)		(39)		(410)
12 months or more, Estimated Fair Value	23,503		23,503		23,504
12 months or more, Unrealized/Unrecognized Losses	(2,173)		(2,173)		(2,556)
Total, Estimated Fair Value	34,213		34,213		43,128
Total, Unrealized/Unrecognized Losses	(2,212)		(2,212)		(2,966)
Commercial MBS | Held-to-maturity Securities
Held-to-maturity Securities
12 months or more, Estimated Fair Value	7,393		7,393		7,192
12 months or more, Unrealized/Unrecognized Losses	(664)		(664)		(876)
Total, Estimated Fair Value	7,393		7,393		7,192
Total, Unrealized/Unrecognized Losses	(664)		(664)		(876)
Asset-backed securities | Available-for-sale Securities
Available-for-sale Securities
12 months or more, Estimated Fair Value	2,465		2,465		2,637
12 months or more, Unrealized/Unrecognized Losses	(75)		(75)		(40)
Total, Estimated Fair Value	2,465		2,465		2,637
Total, Unrealized/Unrecognized Losses	(75)		(75)		(40)
U.S. Treasury securities | Held-to-maturity Securities
Held-to-maturity Securities
12 months or more, Estimated Fair Value	9,811		9,811		29,528
12 months or more, Unrealized/Unrecognized Losses	(156)		(156)		(410)
Total, Estimated Fair Value	9,811		9,811		29,528
Total, Unrealized/Unrecognized Losses	$ (156)		$ (156)		$ (410)

X

- Definition

Amount of accumulated unrealized loss on investment in debt security (excluding accrued interest) measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer.

+ References

No definition available.

+ Details

Name:	mcb_DebtSecuritiesExcludingAccruedInterestHeldToMaturityContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix:	mcb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for 12 months or longer.

+ References

No definition available.

+ Details

Name:	mcb_DebtSecuritiesExcludingAccruedInterestHeldToMaturityContinuousUnrealizedLossPosition12MonthsOrLongerFairValue
Namespace Prefix:	mcb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of accumulated unrealized loss on investment in debt security (excluding accrued interest) measured at amortized cost (held-to-maturity), in unrealized loss position.

+ References

No definition available.

+ Details

Name:	mcb_DebtSecuritiesExcludingAccruedInterestHeldToMaturityUnrealizedLossPositionAccumulatedLoss
Namespace Prefix:	mcb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value of investment in debt security (excluding accrued interest) measured at amortized cost (held-to-maturity), in unrealized loss position.

+ References

No definition available.

+ Details

Name:	mcb_DebtSecuritiesExcludingAccruedInterestHeldToMaturityUnrealizedLossPositionFairValue
Namespace Prefix:	mcb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Number of securities of one issuer that the company hold in an amount greater than 10% of stockholders' equity.

+ References

No definition available.

+ Details

Name:	mcb_SecuritiesOfOneIssuer
Namespace Prefix:	mcb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 942
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480095/942-10-S50-1

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 942
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480035/942-10-S99-6

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482130/360-10-45-4

+ Details

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479081/326-30-55-8

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-7

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-5

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-5

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479081/326-30-55-8

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-7

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-5

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-5

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479081/326-30-55-8

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-6

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-4

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-4

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_InformationByCategoryOfDebtSecurityAxis=us-gaap_AvailableforsaleSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InformationByCategoryOfDebtSecurityAxis=us-gaap_HeldtomaturitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=mcb_UnitedStatesAndMunicipalSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: