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Allowance for Loan Losses (the Allowance) - Troubled debt restructuring (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Allowance for Loan Losses (the Allowance)
TDRs included in nonperforming loans and leases	$ 367	$ 244
TDRs in compliance with modified terms	2,476	3,362
Total TDRs	$ 2,843	$ 3,606

X

- Definition

The amount of the outstanding recorded investment in compliance with modification terms of troubled debt restructurings.

+ References

No definition available.

+ Details

Name:	mrbk_FinancingReceivableModificationsInComplianceWithModificationTerms
Namespace Prefix:	mrbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been included in non performing loans and leases receivables modified by troubled debt restructurings.

+ References

No definition available.

+ Details

Name:	mrbk_FinancingReceivableModificationsIncludedInNonperformingLoansAndLeases
Namespace Prefix:	mrbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

+ Details

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