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Minimum Regulatory Capital Requirements (Tables) | 12 Months Ended
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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 | %

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958577-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 18 -IssueDate 2006-05-01 -Chapter 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958570-112826 + Details
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