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Note 16 - Regulatory Capital
 12 Months Ended
Dec. 31, 2012
Regulatory Capital Requirements under Banking Regulations [Text Block]
16.  REGULATORY CAPITAL

Federal regulations require the Company and the Banks to maintain minimum amounts of capital.  Specifically, each is required to maintain certain minimum dollar amounts and ratios of Total and Tier I capital to risk-weighted assets and of Tier I capital to average total assets.

In addition to the capital requirements, the Federal Deposit Insurance Corporation Improvement Act (“FDICIA”) established five capital categories ranging from “well capitalized” to “critically undercapitalized.”  Should any institution fail to meet the requirements to be considered “adequately capitalized,” it would become subject to a series of increasingly restrictive regulatory actions.

As of December 31, 2012 and 2011, the FDIC categorized the Banks as well capitalized under the regulatory framework for prompt corrective action.  To be classified as a well capitalized financial institution, Total risk-based, Tier 1 risk-based, and Tier 1 Leverage capital ratios must be at least 10 percent, 6 percent, and 5 percent, respectively.

The Company’s and its subsidiaries’ actual capital ratios are presented in the following table that shows that all regulatory capital requirements were met as of December 31, 2012.

(Dollar amounts in thousands)
 
Middlefield Banc Corp.
December 31, 2012
   
The Middlefield Banking Co.
December 31, 2012
   
Emerald Bank
December 31, 2012
 
   
Amount
   
Ratio
   
Amount
   
Ratio
   
Amount
   
Ratio
 
                                     
Total Capital
                                   
(to Risk-weighted Assets)
                                   
                                     
Actual
  $ 57,784       13.86 %   $ 47,887       13.29 %   $ 8,440       15.45 %
For Capital Adequacy Purposes
    33,344       8.00       28,822       8.00       4,370       8.00  
To Be Well Capitalized
    41,680       10.00       36,027       10.00       5,463       10.00  
                                                 
Tier I Capital
                                               
(to Risk-weighted Assets)
                                               
                                                 
Actual
  $ 52,543       12.61 %   $ 43,371       12.04 %   $ 7,737       14.16 %
For Capital Adequacy Purposes
    16,672       4.00       14,411       4.00       2,185       4.00  
To Be Well Capitalized
    25,008       6.00       21,616       6.00       3,278       6.00  
                                                 
Tier I Capital
                                               
(to Average Assets)
                                               
                                                 
Actual
  $ 52,543       7.88 %   $ 43,371       7.32 %   $ 7,737       10.61 %
For Capital Adequacy Purposes
    26,675       4.00       23,684       4.00       2,916       4.00  
To Be Well Capitalized
    33,344       5.00       29,605       5.00       3,646       5.00  

See Note 15 for additional information concerning regulatory capital requirements

The Company’s and its subsidiaries’ actual capital ratios are presented in the following table that shows that all regulatory capital requirements were met as of December 31, 2011.

   
Middlefield Banc Corp.
December 31, 2011
   
The Middlefield Banking Co.
December 31, 2011
   
Emerald Bank
December 31, 2011
 
   
Amount
   
Ratio
   
Amount
   
Ratio
   
Amount
   
Ratio
 
                                     
Total Capital
                                   
(to Risk-weighted Assets)
                                   
                                     
Actual
  $ 49,915       12.06 %   $ 42,185       11.75 %   $ 7,456       13.82 %
For Capital Adequacy Purposes
    33,101       8.00       28,722       8.00       4,317       8.00  
To Be Well Capitalized
    41,376       10.00       35,903       10.00       5,396       10.00  
                                                 
Tier I Capital
                                               
(to Risk-weighted Assets)
                                               
                                                 
Actual
  $ 44,723       10.81 %   $ 37,697       10.50 %   $ 6,782       12.57 %
For Capital Adequacy Purposes
    16,551       4.00       14,361       4.00       2,158       4.00  
To Be Well Capitalized
    24,826       6.00       21,542       6.00       3,237       6.00  
                                                 
Tier I Capital
                                               
(to Average Assets)
                                               
                                                 
Actual
  $ 44,723       7.13 %   $ 37,697       6.75 %   $ 6,782       9.92 %
For Capital Adequacy Purposes
    25,079       4.00       22,325       4.00       2,734       4.00  
To Be Well Capitalized
    31,349       5.00       27,906       5.00       3,417       5.00