XML 60 R49.htm IDEA: XBRL DOCUMENT
v3.19.2

Note 8 - Loans and Related Allowance for Loan and Lease Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018
Individually evaluated for impairment |  |  |  |  |  | $ 863 | $ 1,354
Collectively evaluated for impairment |  |  |  |  |  | 6,441 | 6,074
Less allowance for loan and lease losses | $ 7,304 | $ 7,428 | $ 7,502 | $ 7,304 | $ 7,190 | 7,304 | 7,428
ALLL balance, period start | 7,206 | 7,428 | 7,551 | 7,428 | 7,190 |  |
Charge-offs | (98) |  | (315) | (613) | (329) |  |
Recoveries | 86 |  | 56 | 139 | 221 |  |
Provision | 110 |  | 210 | 350 | 420 |  |
ALLL balance, period end | 7,304 | 7,206 | 7,502 | 7,304 | 7,502 |  |
Commercial And Industrial [Member] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 140 | 667
Collectively evaluated for impairment |  |  |  |  |  | 399 | 302
Less allowance for loan and lease losses | 539 | 969 | 1,180 | 539 | 999 | 539 | 969
ALLL balance, period start | 586 | 969 | 1,256 | 969 | 999 |  |
Charge-offs | (9) |  |  | (355) | (9) |  |
Recoveries | 24 |  | 29 | 40 | 140 |  |
Provision | (62) |  | (105) | (115) | 50 |  |
ALLL balance, period end | 539 | 586 | 1,180 | 539 | 1,180 |  |
Real Estate Construction Porfolio Segment [Member] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  |  | 90 | 100
Less allowance for loan and lease losses | 90 | 100 | 89 | 90 | 313 | 90 | 100
ALLL balance, period start | 748 | 100 | 92 | 100 | 313 |  |
Charge-offs |  |  |  |  |  |  |
Recoveries | 23 |  |  | 45 | 17 |  |
Provision | (681) |  | (3) | (55) | (241) |  |
ALLL balance, period end | 90 | 748 | 89 | 90 | 89 |  |
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 51 | 43
Collectively evaluated for impairment |  |  |  |  |  | 1,630 | 1,538
Less allowance for loan and lease losses | 1,681 | 1,581 | 1,743 | 1,681 | 1,760 | 1,681 | 1,581
ALLL balance, period start | 1,623 | 1,581 | 1,782 | 1,581 | 1,760 |  |
Charge-offs | (48) |  | (74) | (138) | (74) |  |
Recoveries | 33 |  | 10 | 46 | 29 |  |
Provision | 73 |  | 25 | 192 | 28 |  |
ALLL balance, period end | 1,681 | 1,623 | 1,743 | 1,681 | 1,743 |  |
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 672 | 643
Collectively evaluated for impairment |  |  |  |  |  | 4,203 | 4,008
Less allowance for loan and lease losses | 4,875 | 4,651 | 4,361 | 4,875 | 4,036 | 4,875 | 4,651
ALLL balance, period start | 4,161 | 4,651 | 4,323 | 4,651 | 4,036 |  |
Charge-offs |  |  | (111) | (32) | (111) |  |
Recoveries | 1 |  |  | 2 |  |  |
Provision | 713 |  | 149 | 254 | 436 |  |
ALLL balance, period end | 4,875 | 4,161 | 4,361 | 4,875 | 4,361 |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  | 1
Collectively evaluated for impairment |  |  |  |  |  | 119 | 126
Less allowance for loan and lease losses | 119 | 127 | 129 | 119 | 82 | $ 119 | $ 127
ALLL balance, period start | 88 | 127 | 98 | 127 | 82 |  |
Charge-offs | (41) |  | (130) | (88) | (135) |  |
Recoveries | 5 |  | 17 | 6 | 35 |  |
Provision | 67 |  | 144 | 74 | 147 |  |
ALLL balance, period end | $ 119 | $ 88 | $ 129 | $ 119 | $ 129 |  |

X
- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
Name: | us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
Name: | us-gaap_LoansAndLeasesReceivableAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
Name: | us-gaap_ProvisionForLoanLeaseAndOtherLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=mbcn_CommercialAndIndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=mbcn_RealEstateConstructionPorfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=mbcn_RealEstateMortgagePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbcn_ResidentialLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbcn_CommercialLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |