XML 47 R45.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Note 15 - Commitments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Notes Tables |
Other Commitments [Table Text Block] |
(Dollar amounts in thousands) |  | 2019 |  |  | 2018 |
Commitments to extend credit |  | $ | 260,579 |  |  | $ | 228,427 |
Standby letters of credit |  |  | 1,616 |  |  |  | 1,656 |
Total |  | $ | 262,195 |  |  | $ | 230,083 |
Lease, Cost [Table Text Block] |
|  | For the Twelve |
|  | Months Ended |
|  | December 31, 2019 |
Lease Costs: |  |  |  |
Finance lease cost: |  |  |  |
Amortization of right-of-use asset |  | $ | 360 |
Interest Expense |  |  | 132 |
Other |  |  | 57 |
Operating lease cost |  |  | 245 |
Total lease cost |  | $ | 794 |
Lease, Term and Discount Rate [Table Text Block] |
|  | Operating |  |  | Finance |
Weighted-average term (years) |  |  | 6.5 |  |  |  | 13.7 |
Weighted-average discount rate |  |  | 2.9 | % |  |  | 3.3 | %
Operating and Finance Lease, Liability, Maturity [Table Text Block] |
|  | Operating |  |  | Finance |
Undiscounted cash flows due within: |  |  |  |  |  |  |  |
2020 |  | $ | 185 |  |  | $ | 458 |
2021 |  |  | 169 |  |  |  | 476 |
2022 |  |  | 169 |  |  |  | 478 |
2023 |  |  | 169 |  |  |  | 478 |
2024 |  |  | 133 |  |  |  | 478 |
2025 and thereafter |  |  | 174 |  |  |  | 2,749 |
Total undiscounted cash flows |  |  | 999 |  |  |  | 5,117 |
Impact of present value discount |  |  | (93 | ) |  |  | (1,019 | )
Amount reported on balance sheet |  | $ | 906 |  |  | $ | 4,098 |

X
- Definition Tabular disclosure of term and discount rate of lease. + References No definition available. + Details
Name: | mbcn_LeaseTermAndDiscountRateTableTextBlock
Namespace Prefix: | mbcn_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of undiscounted cash flows of operating and finance lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating and finance lease liability recognized in statement of financial position. + References No definition available. + Details
Name: | mbcn_OperatingAndFinanceLeaseLiabilityMaturityTableTextBlock
Namespace Prefix: | mbcn_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
Name: | us-gaap_LeaseCostTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information about obligations resulting from other commitments. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration