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Regulatory Capital (Tables)
 12 Months Ended
Dec. 31, 2015
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]

 

     As of December 31, 2015  
     Leverage     Tier 1 Risk
Based		     Common
Equity Tier 1		     Total Risk
Based		  

The Middlefield Banking Company

      9.23 %      12.52 %      12.52 %      13.73 % 

Middlefield Banc Corp.

      8.69 %      12.00 %      12.00 %      13.20 % 

Adequately capitalized ratio

      4.00 %      6.00 %      4.50 %      8.00 % 

Adequately capitalized ratio plus capital conservation buffer

      4.00 %      8.50 %      7.00 %      10.50 % 

Well-capitalized ratio (Bank only)

      5.00 %      8.00 %      6.50 %      10.00 % 

 

 

     As of December 31, 2014  
     Leverage     Tier 1 Risk
Based		     Total Risk
Based		  

The Middlefield Banking Company

      9.25 %      12.95 %      14.19 % 

Middlefield Banc Corp.

      9.60 %      13.38 %      14.64 % 

Adequately capitalized ratio

      4.00 %      4.00 %      8.00 %