Name:	mbrg_CorporatePreferredStockFairValueDisclosure
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

No definition available.

Name:	mbrg_CorporateSecuritiesFairValueDisclosure
Namespace Prefix:	mbrg_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Details

Name:	mbrg_MortgageBackedSecuritiesAbstract
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Mortgage Banking Hedge Instruments, Fair Value Disclosure

No definition available.

Name:	mbrg_MortgageBankingHedgeInstrumentsFairValueDisclosure
Namespace Prefix:	mbrg_
Data Type:	xbrli:monetaryItemType
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Mortgage Servicing Rights, Fair Value Disclosure

No definition available.

Name:	mbrg_MortgageServicingRightsFairValueDisclosure
Namespace Prefix:	mbrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages) as of the balance sheet date.

No definition available.

Name:	mbrg_NonAgencyMortgageBackedSecuritiesFairValueDisclosure
Namespace Prefix:	mbrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Bonds or similar securities issued by state, city, or local US governments or the agencies operated by state, city, or local governments. Debt securities issued by state governments may include bond issuances of US state authorities including, for example, but not limited to, housing authorities, dormitory authorities, and general obligations while debt securities issued by political subdivisions of US states would include, for example, debt issuances by county, borough, city, or municipal governments.

No definition available.

Name:	mbrg_ObligationsOfStatesAndPoliticalSubdivisionsFairValueDisclosure
Namespace Prefix:	mbrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents securitized, pay-through debt securities collateralized by other assets, not real estate mortgage loans (mortgages), as of the balance sheet date.

No definition available.

Name:	mbrg_OtherAssetBackedSecuritiesFairValueDisclosure
Namespace Prefix:	mbrg_
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Period Type:	instant

No definition available.

Name:	mbrg_UnitedStatesGovernmentAgencyDebtSecuritiesFairValueDisclosure
Namespace Prefix:	mbrg_
Data Type:	xbrli:monetaryItemType
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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages) as of the balance sheet date.

No definition available.

Name:	mbrg_UsAgencyMortgageBackedSecuritiesFairValueDisclosure
Namespace Prefix:	mbrg_
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Balance Type:	debit
Period Type:	instant

- Details

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (c)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 6

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

Name:	us-gaap_DerivativeLiabilities
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Balance Type:	credit
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Carrying amount as of the balance sheet date of the asset arising from a financial instrument or a contract used to mitigate a specified risk (hedge), and which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

No definition available.