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Consolidated Statement of Changes in Stockholders' Equity (Unaudited) (USD $)
In Thousands
Common Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Total
Balance, December 31, 2014 at Dec. 31, 2014 $ 35,529us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 32,524us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 2,548us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ (6,734)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 63,867us-gaap_StockholdersEquity
Net income   1,628us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    1,628us-gaap_NetIncomeLoss
Other comprehensive income     546us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
  546us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Dividend reinvestment and purchase plan (5,281 shares) 175mbcn_DividendReinvestmentAndPurchasePlan
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      175mbcn_DividendReinvestmentAndPurchasePlan
Stock options exercised (250 shares) 2us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      2us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Cash dividends ($0.26 per share)   (534)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    (534)us-gaap_DividendsCommonStockCash
Balance, March 31, 2015 at Mar. 31, 2015 $ 35,706us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 33,618us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 3,094us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ (6,734)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 65,684us-gaap_StockholdersEquity