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Summary of Significant Accounting Policies - Nature of Operations (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($)	Dec. 31, 2020 Office
Business Acquisition [Line Items]
Mortgage interest and fees to be reimbursed | $	$ 474
Mortgage loan origination licensing error fine to Maryland | $	$ 12
PENNSYLVANIA
Business Acquisition [Line Items]
Number of full-service offices		6
Delaware Valley
Business Acquisition [Line Items]
Number of mortgage loan production offices		9
Maryland
Business Acquisition [Line Items]
Number of mortgage loan production offices		7

X

- Definition

The amount of fines paid to Maryland due to mortgage loan originations licensing error.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of mortgage Loan originations interest and fees that the company has agreed to refund.

+ References

No definition available.

+ Details

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

X

- Definition

The number of full-service offices.

+ References

No definition available.

+ Details

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Namespace Prefix:	mrbk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of mortgage loan production offices.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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