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Allowance for Loan Losses (the Allowance) - COVID-19 Loan modifications Programs (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
COVID-19 Loan Modification Programs
Portfolio Balance	$ 1,114,028	$ 1,073,451
Active Modifications	$ 28,754	$ 26,905
Percentage of Loan Portfolio	2.60%	2.50%
Commercial mortgage
COVID-19 Loan Modification Programs
Portfolio Balance	$ 517,421	$ 485,103
Active Modifications	$ 24,341	$ 19,836
Percentage of Loan Portfolio	4.70%	4.10%
Commercial and industrial, including leases
COVID-19 Loan Modification Programs
Portfolio Balance	$ 308,091	$ 292,790
Active Modifications	$ 70
Percentage of Loan Portfolio	0.00%
Construction & land development
COVID-19 Loan Modification Programs
Portfolio Balance	$ 134,601	140,246
Active Modifications	$ 4,343	$ 4,343
Percentage of Loan Portfolio	3.20%	3.10%
Home equity lines and loans
COVID-19 Loan Modification Programs
Portfolio Balance	$ 55,578	$ 64,987
Residential mortgage
COVID-19 Loan Modification Programs
Portfolio Balance	35,495	40,272
Small business loans
COVID-19 Loan Modification Programs
Portfolio Balance	62,373	49,542
Active Modifications		2,726
Consumer
COVID-19 Loan Modification Programs
Portfolio Balance	$ 469	$ 511

X

- Definition

The percent of financial receivable loans modified and not treated as troubled debt restructuring.

+ References

No definition available.

+ Details

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Namespace Prefix:	mrbk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of financing receivable modified not treated as troubled debt restructuring.

+ References

No definition available.

+ Details

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

X

- Definition

Active amount of financing receivable modified not treated as troubled debt restructuring.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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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

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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