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Loans Receivable - Loans and leases outstanding by rate type (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Loans Receivable |  |
Loans with predetermined rates | $ 622,498 | $ 658,458
Loans with adjustable or floating rates | 906,798 | 860,497
Total loans and leases | 1,529,296 | 1,518,955
Net deferred loan origination (fees) costs | $ (4,497) | $ (4,992)

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- Definition The total amount of loans receivable before allowances and fees. + References No definition available. + Details
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Namespace Prefix: | mrbk_
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Balance Type: | debit
Period Type: | instant

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- Definition Amount of loan with fixed rate of interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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- Definition Amount of loan with variable or adjustable rate of interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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- References No definition available. + Details
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- Definition Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533 + Details
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