XML 136 R115.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Note 23 - Return on Equity and Assets - Summary of Return on Equity and Assets (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Average total assets |  |  |  |  |  |  |  |  |  | $ 1,069,656 | $ 757,052 | $ 710,271
Average shareholders' equity |  |  |  |  |  |  |  |  |  | 110,966 | 68,741 | 64,655
Net income |  | $ 2,386 | $ 2,462 | $ 2,507 | $ 2,100 | $ 1,660 | $ 1,343 | $ 1,926 | $ 1,487 | 9,455 | 6,416 | 6,865
Net income available to common shareholders |  |  |  |  |  |  |  |  |  | $ 9,455 | $ 6,416 | $ 6,865
Cash dividends declared per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1.08 | $ 1.08 | $ 1.07
Return on average total assets |  |  |  |  |  |  |  |  |  | 0.88% | 0.85% | 0.97%
Return on average shareholders' equity |  |  |  |  |  |  |  |  |  | 8.52% | 9.33% | 10.62%
Dividend payout ratio (1) | [1] |  |  |  |  |  |  |  |  | 35.52% | 36.18% | 31.36%
Average shareholders' equity to average assets |  |  |  |  |  |  |  |  |  | 10.37% | 9.08% | 9.10%
[1] | Cash dividends declared on common shares divided by net income available to common shareholders.

X
- Definition Represents the amount of average shareholders equity. + References No definition available. + Details
Name: | mbcn_AverageShareholdersEquity
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the average shareholders equity to average assets ratio. + References No definition available. + Details
Name: | mbcn_AverageShareholdersEquityToAverageAssetsRatio
Namespace Prefix: | mbcn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of average total assets held by the company. + References No definition available. + Details
Name: | mbcn_AverageTotalAssets
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the dividend payout ratio. Calculated by dividing cash dividends declared on common shares by net income available to common shareholders. + References No definition available. + Details
Name: | mbcn_DividendPayoutRatio
Namespace Prefix: | mbcn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the return, expressed as a percentage, on average shareholders equity. + References No definition available. + Details
Name: | mbcn_ReturnOnAverageShareholdersEquity
Namespace Prefix: | mbcn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the return, expressed as a percentage, of average total assets. + References No definition available. + Details
Name: | mbcn_ReturnOnAverageTotalAssets
Namespace Prefix: | mbcn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_NetIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1377-109256 + Details
Name: | us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration