XML 53 R42.htm IDEA: XBRL DOCUMENT v3.21.2

Allowance for Loan Losses (the Allowance) - Carrying value based on credit quality indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Evaluated based on credit quality indicators
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	$ 1,246,114	$ 1,205,751
Pass
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	1,138,361	1,124,015
Special mention
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	76,212	61,740
Substandard
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	31,541	16,316
Doubtful
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases		3,680
Commercial mortgage | Evaluated based on credit quality indicators
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	542,473	485,103
Commercial mortgage | Pass
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	505,355	449,545
Commercial mortgage | Special mention
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	31,464	32,059
Commercial mortgage | Substandard
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	5,654	3,499
Home equity lines and loans | Evaluated based on credit quality indicators
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	52,819	64,987
Home equity lines and loans | Pass
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	51,427	63,923
Home equity lines and loans | Substandard
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	1,392	1,064
Construction | Evaluated based on credit quality indicators
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	162,192	140,246
Construction | Pass
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	153,200	132,286
Construction | Special mention
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	8,992	7,960
Commercial and industrial | Evaluated based on credit quality indicators
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	278,976	261,750
Commercial and industrial | Pass
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	222,041	227,349
Commercial and industrial | Special mention
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	35,756	21,721
Commercial and industrial | Substandard
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	21,179	9,000
Commercial and industrial | Doubtful
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases		3,680
Small business loans | Evaluated based on credit quality indicators
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	90,477	49,542
Small business loans | Pass
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	87,161	46,789
Small business loans | Substandard
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	3,316	2,753
Paycheck Protection Program loans ("PPP") | Evaluated based on credit quality indicators
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	118,585	203,543
Paycheck Protection Program loans ("PPP") | Pass
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	118,585	203,543
MainStreet Lending Program Loans ("PPP") | Evaluated based on credit quality indicators
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	592	580
MainStreet Lending Program Loans ("PPP") | Pass
Loans and Leases by Credit Ratings
Carry value of loans and leases excluding residential mortgage, consumer and leases	$ 592	$ 580

X

- Definition

The balance of financing receivable excluding loans and leases carried at fair value and also excluding residential mortgage, consumer and leases.

+ References

No definition available.

+ Details

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

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

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

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_InternalNoninvestmentGradeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=mrbk_CommercialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialAndIndustrialSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=mrbk_SmallBusinessLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=mrbk_PaycheckProtectionProgramLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=mrbk_MainstreetLendingProgramLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: