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Allowance for Loan Losses (the Allowance) - Carrying value based on performance status (Details) $ in Thousands	Mar. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
Loans and Leases by Credit Ratings
Troubled debt restructurings	$ 2,773	$ 3,606
Evaluated by performance status
Loans and Leases by Credit Ratings
Carrying value of residential mortgage, consumer and leases	82,634	71,823
Performing
Loans and Leases by Credit Ratings
Carrying value of residential mortgage, consumer and leases	80,689	70,008
Nonperforming
Loans and Leases by Credit Ratings
Carrying value of residential mortgage, consumer and leases	1,945	1,815
Residential mortgage | Evaluated by performance status
Loans and Leases by Credit Ratings
Carrying value of residential mortgage, consumer and leases	35,495	40,272
Residential mortgage | Performing
Loans and Leases by Credit Ratings
Troubled debt restructurings	0	0
Carrying value of residential mortgage, consumer and leases	33,681	38,457
Residential mortgage | Nonperforming
Loans and Leases by Credit Ratings
Carrying value of residential mortgage, consumer and leases	$ 1,814	$ 1,815
Number of loans | loan	5	5
Loans receivable, net of the allowance and lease losses	$ 902	$ 910
Consumer | Evaluated by performance status
Loans and Leases by Credit Ratings
Carrying value of residential mortgage, consumer and leases	469	511
Consumer | Performing
Loans and Leases by Credit Ratings
Carrying value of residential mortgage, consumer and leases	469	511
Leases | Evaluated by performance status
Loans and Leases by Credit Ratings
Carrying value of residential mortgage, consumer and leases	46,670	31,040
Leases | Performing
Loans and Leases by Credit Ratings
Carrying value of residential mortgage, consumer and leases	46,539	$ 31,040
Leases | Nonperforming
Loans and Leases by Credit Ratings
Carrying value of residential mortgage, consumer and leases	$ 131

X

- Definition

The balance of financing receivables for residential mortgage, consumer and leases.

+ References

No definition available.

+ Details

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

X

- Definition

Number of loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	mrbk_
Data Type:	xbrli:integerItemType
Balance Type:	na
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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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Balance Type:	debit
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

+ Details

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- Details

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- Details

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Namespace Prefix:
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- Details

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- Details

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- Details

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