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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)	3 Months Ended
	Mar. 31, 2021 $ / shares
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
Dividends declared	$ 1.125

X

- Definition

The total amount of dividends and special dividends paid during hte period fo reach share of common stock outstanding.

+ References

No definition available.

+ Details

Name:	mrbk_CommonStockDividendsPerShareAndSpecialDividendsPerShare
Namespace Prefix:	mrbk_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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