XML 50 R39.htm IDEA: XBRL DOCUMENT v3.24.2.u1

INVESTMENT SECURITIES (Schedule of Securities with Unrealized Losses) (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2024 USD ($) item	Jun. 30, 2024 USD ($) item	Dec. 31, 2023 USD ($) item
Held-to-maturity Securities
Number of securities of one issuer | item	0	0	0
Impairment loss	$ 0	$ 0
Available-for-sale Securities.
Available-for-sale Securities
Less than 12 Months, Estimated Fair Value	59,914	59,914	$ 10,873
Less than 12 Months, Unrealized/Unrecognized Losses	(1,143)	(1,143)	(198)
12 months or more, Estimated Fair Value	371,279	371,279	380,995
12 months or more, Unrealized/Unrecognized Losses	(81,488)	(81,488)	(78,854)
Total, Estimated Fair Value	431,193	431,193	391,868
Total, Unrealized/Unrecognized Losses	(82,631)	(82,631)	(79,052)
Held-to-maturity Securities
Held-to-maturity Securities
Less than 12 Months, Estimated Fair Value	0	0	0
Less than 12 Months, Unrealized/Unrecognized Losses	0	0	0
12 months or more, Estimated Fair Value	382,590	382,590	404,252
12 months or more, Unrealized/Unrecognized Losses	(66,778)	(66,778)	(64,608)
Total, Estimated Fair Value	382,590	382,590	404,252
Total, Unrealized/Unrecognized Losses	(66,778)	(66,778)	(64,608)
U.S. Government agency securities | Available-for-sale Securities.
Available-for-sale Securities
Less than 12 Months, Estimated Fair Value	0	0	0
Less than 12 Months, Unrealized/Unrecognized Losses	0	0	0
12 months or more, Estimated Fair Value	62,161	62,161	61,775
12 months or more, Unrealized/Unrecognized Losses	(5,837)	(5,837)	(6,222)
Total, Estimated Fair Value	62,161	62,161	61,775
Total, Unrealized/Unrecognized Losses	(5,837)	(5,837)	(6,222)
U.S. State and Municipal securities | Available-for-sale Securities.
Available-for-sale Securities
Less than 12 Months, Estimated Fair Value	0	0	0
Less than 12 Months, Unrealized/Unrecognized Losses	0	0	0
12 months or more, Estimated Fair Value	9,490	9,490	9,699
12 months or more, Unrealized/Unrecognized Losses	(1,929)	(1,929)	(1,797)
Total, Estimated Fair Value	9,490	9,490	9,699
Total, Unrealized/Unrecognized Losses	(1,929)	(1,929)	(1,797)
U.S. State and Municipal securities | Held-to-maturity Securities
Held-to-maturity Securities
Less than 12 Months, Estimated Fair Value	0	0	0
Less than 12 Months, Unrealized/Unrecognized Losses	0	0	0
12 months or more, Estimated Fair Value	13,554	13,554	13,995
12 months or more, Unrealized/Unrecognized Losses	(1,891)	(1,891)	(1,574)
Total, Estimated Fair Value	13,554	13,554	13,995
Total, Unrealized/Unrecognized Losses	(1,891)	(1,891)	(1,574)
Residential MBS | Available-for-sale Securities.
Available-for-sale Securities
Less than 12 Months, Estimated Fair Value	49,607	49,607	0
Less than 12 Months, Unrealized/Unrecognized Losses	(992)	(992)	0
12 months or more, Estimated Fair Value	273,061	273,061	292,970
12 months or more, Unrealized/Unrecognized Losses	(70,934)	(70,934)	(68,609)
Total, Estimated Fair Value	322,668	322,668	292,970
Total, Unrealized/Unrecognized Losses	(71,926)	(71,926)	(68,609)
Residential MBS | Held-to-maturity Securities
Held-to-maturity Securities
Less than 12 Months, Estimated Fair Value	0	0	0
Less than 12 Months, Unrealized/Unrecognized Losses	0	0	0
12 months or more, Estimated Fair Value	333,196	333,196	354,750
12 months or more, Unrealized/Unrecognized Losses	(62,732)	(62,732)	(60,556)
Total, Estimated Fair Value	333,196	333,196	354,750
Total, Unrealized/Unrecognized Losses	(62,732)	(62,732)	(60,556)
Commercial MBS | Available-for-sale Securities.
Available-for-sale Securities
Less than 12 Months, Estimated Fair Value	10,307	10,307	10,873
Less than 12 Months, Unrealized/Unrecognized Losses	(151)	(151)	(198)
12 months or more, Estimated Fair Value	23,583	23,583	13,322
12 months or more, Unrealized/Unrecognized Losses	(2,740)	(2,740)	(2,168)
Total, Estimated Fair Value	33,890	33,890	24,195
Total, Unrealized/Unrecognized Losses	(2,891)	(2,891)	(2,366)
Commercial MBS | Held-to-maturity Securities
Held-to-maturity Securities
Less than 12 Months, Estimated Fair Value	0	0	0
Less than 12 Months, Unrealized/Unrecognized Losses	0	0	0
12 months or more, Estimated Fair Value	7,022	7,022	7,024
12 months or more, Unrealized/Unrecognized Losses	(1,057)	(1,057)	(1,066)
Total, Estimated Fair Value	7,022	7,022	7,024
Total, Unrealized/Unrecognized Losses	(1,057)	(1,057)	(1,066)
Asset-backed Securities | Available-for-sale Securities.
Available-for-sale Securities
Less than 12 Months, Estimated Fair Value	0	0	0
Less than 12 Months, Unrealized/Unrecognized Losses	0	0	0
12 months or more, Estimated Fair Value	2,984	2,984	3,229
12 months or more, Unrealized/Unrecognized Losses	(48)	(48)	(58)
Total, Estimated Fair Value	2,984	2,984	3,229
Total, Unrealized/Unrecognized Losses	(48)	(48)	(58)
US Treasury Securities | Held-to-maturity Securities
Held-to-maturity Securities
Less than 12 Months, Estimated Fair Value	0	0	0
Less than 12 Months, Unrealized/Unrecognized Losses	0	0	0
12 months or more, Estimated Fair Value	28,818	28,818	28,483
12 months or more, Unrealized/Unrecognized Losses	(1,098)	(1,098)	(1,412)
Total, Estimated Fair Value	28,818	28,818	28,483
Total, Unrealized/Unrecognized Losses	$ (1,098)	$ (1,098)	$ (1,412)

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 continuous loss position for less than 12 months.

+ References

No definition available.

+ Details

Name:	mcb_DebtSecuritiesExcludingAccruedInterestHeldToMaturityContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
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 less than twelve months.

+ References

No definition available.

+ Details

Name:	mcb_DebtSecuritiesExcludingAccruedInterestHeldToMaturityContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
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://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: