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Minimum Regulatory Capital Requirements (Tables)
 12 Months Ended
Dec. 31, 2012
Banking and Thrift [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]

As of December 31, 2012, the most recent notification from the Federal Deposit Insurance Corporation (FDIC) categorized the Bank as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized, an institution must maintain minimum total-risk based, Tier I risk-based, and Tier I leverage ratios as set forth in the following tables. There are no conditions or events since that notification that management believes have changed the Bank's prompt corrective action category. Cornerstone’s and the Bank's capital amounts and ratios are also presented in the table. Dollar amounts are presented in thousands.

 

              To be Well 
              Capitalized Under 
        For Capital  Prompt Corrective 
  Actual  Adequacy Purposes  Action Provisions 
  Amount  Ratio  Amount  Ratio  Amount  Ratio 
As of December 31, 2012:                        
Total capital to risk-weighted assets:                        
Consolidated $35,795   11.8% $24,179   8.0%  N/A   N/A 
Cornerstone Community Bank  38,930   12.9%  24,123   8.0% $30,154   10.0%
                         
Tier I capital to risk-weighted assets:                        
Consolidated  31,988   10.6%  12,090   4.0%  N/A   N/A 
Cornerstone Community Bank  35,132   11.7%  12,061   4.0%  18,092   6.0%
                         
Tier I capital to average assets:                        
Consolidated  31,988   7.6%  16,807   4.0%  N/A   N/A 
Cornerstone Community Bank  35,132   8.4%  16,787   4.0%  20,984   5.0%
                         
As of December 31, 2011:                        
Total capital to risk-weighted assets:                        
Consolidated $35,246   12.2% $23,043   8.0%  N/A   N/A 
Cornerstone Community Bank  37,158   13.0%  22,876   8.0% $28,594   10.0%
                         
Tier I capital to risk-weighted assets:                        
Consolidated  31,599   11.0%  11,521   4.0%  N/A   N/A 
Cornerstone Community Bank  33,536   11.7%  11,438   4.0%  17,157   6.0%
                         
Tier I capital to average assets:                        
Consolidated  31,599   7.6%  16,713   4.0%  N/A   N/A 
Cornerstone Community Bank  33,536   8.0%  16,686   4.0%  20,857   5.0%