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Fair Value Disclosures (Tables) | 9 Months Ended
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Sep. 30, 2012
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | Assets and liabilities recorded at fair value on a recurring basis are as follows.
|  |  |  |  | Quoted Prices in |  |  | Significant |  |  | Significant |
|  |  |  |  | Active Markets |  |  | Other |  |  | Other |
|  | Balance as of |  |  | for Identical |  |  | Observable |  |  | Unobservable |
|  | September 30, |  |  | Assets |  |  | Inputs |  |  | Inputs |
|  | 2012 |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Debt securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  | $ | 4,068,491 |  |  | $ | - |  |  | $ | 4,068,491 |  |  | $ | - |
State and municipal securities |  |  | 24,004,504 |  |  |  | - |  |  |  | 24,004,504 |  |  |  | - |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage guaranteed by GNMA |  |  | 10,061,169 |  |  |  | - |  |  |  | 10,061,169 |  |  |  | - |
Collateralized mortgage obligations issued or guaranteed by U.S. Government agencies or sponsored agencies |  |  | 44,057,136 |  |  |  | - |  |  |  | 44,057,136 |  |  |  | - |
Total securities available for sale |  | $ | 82,191,300 |  |  | $ | - |  |  | $ | 82,191,300 |  |  | $ | - |
Cash surrender value of life insurance |  | $ | 1,191,487 |  |  | $ | - |  |  | $ | 1,191,487 |  |  | $ | - |
|  |  |  |  | Quoted Prices in |  |  | Significant |  |  | Significant |
|  |  |  |  | Active Markets |  |  | Other |  |  | Other |
|  | Balance as of |  |  | for Identical |  |  | Observable |  |  | Unobservable |
|  | December 31, |  |  | Assets |  |  | Inputs |  |  | Inputs |
|  | 2011 |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Debt securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  | $ | 4,190,279 |  |  | $ | - |  |  | $ | 4,190,279 |  |  | $ | - |
State and municipal securities |  |  | 24,436,257 |  |  |  | - |  |  |  | 24,436,257 |  |  |  | - |
Mortgage-backed securitie |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage guaranteed by GNMA |  |  | 11,871,170 |  |  |  | - |  |  |  | 11,871,170 |  |  |  | - |
Collateralized mortgage obligations issued or guaranteed by U.S. Government agencies or sponsored agencies |  |  | 45,559,731 |  |  |  | - |  |  |  | 45,559,731 |  |  |  | - |
Total securities available for sale |  | $ | 88,057,437 |  |  | $ | - |  |  | $ | 88,057,437 |  |  | $ | - |
Cash surrender value of life insurance |  | $ | 1,166,774 |  |  | $ | - |  |  | $ | 1,166,774 |  |  | $ | - |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Table Text Block] | The tables below present information about assets and liabilities on the balance sheet at September 30, 2012 and December 31, 2011 for which a nonrecurring change in fair value was recorded (amounts in thousands).
|  |  |  |  | Quoted Prices in |  |  | Significant |  |  | Significant |
|  |  |  |  | Active Markets |  |  | Other |  |  | Other |
|  | Balance as of |  |  | for Identical |  |  | Observable |  |  | Unobservable |
|  | September 30, |  |  | Assets |  |  | Inputs |  |  | Inputs |
|  | 2012 |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Impaired loans |  | $ | 5,246 |  |  | $ | - |  |  | $ | 5,246 |  |  | $ | - |
Foreclosed assets (OREO & Repossessions) |  |  | 22,376 |  |  |  | - |  |  |  | 22,376 |  |  |  | - |
|  |  |  |  | Quoted Prices in |  |  | Significant |  |  | Significant |
|  |  |  |  | Active Markets |  |  | Other |  |  | Other |
|  | Balance as of |  |  | for Identical |  |  | Observable |  |  | Unobservable |
|  | December 31, |  |  | Assets |  |  | Inputs |  |  | Inputs |
|  | 2011 |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Impaired loans |  | $ | 12,245 |  |  | $ | - |  |  | $ | 12,245 |  |  | $ | - |
Foreclosed assets (OREO & Repossessions) |  |  | 18,524 |  |  |  | - |  |  |  | 18,524 |  |  |  | - |
Fair Value, by Balance Sheet Grouping [Table Text Block] | The carrying amount and estimated fair value of Cornerstone's financial instruments at September 30, 2012 and December 31, 2011 are as follows (in thousands):
|  | September 30, 2012 |  |  | December 31, 2011 |
|  | Carrying |  |  | Estimated |  |  | Carrying |  |  | Estimated |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 34,832 |  |  | $ | 34,832 |  |  | $ | 38,883 |  |  | $ | 38,883 |
Securities |  |  | 82,243 |  |  |  | 82,244 |  |  |  | 86,126 |  |  |  | 86,128 |
Federal Home Loan Bank stock |  |  | 2,323 |  |  |  | 2,323 |  |  |  | 2,323 |  |  |  | 2,323 |
Loans, net |  |  | 268,541 |  |  |  | 269,422 |  |  |  | 260,365 |  |  |  | 260,515 |
Cash surrender value of life insurance |  |  | 1,191 |  |  |  | 1,191 |  |  |  | 1,167 |  |  |  | 1,167 |
Accrued interest receivable |  |  | 1,351 |  |  |  | 1,351 |  |  |  | 1,327 |  |  |  | 1,327 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noninterest-bearing demand deposits |  |  | 43,213 |  |  |  | 43,213 |  |  |  | 43,990 |  |  |  | 43,990 |
Interest-bearing demand deposits |  |  | 24,596 |  |  |  | 24,596 |  |  |  | 22,353 |  |  |  | 22,353 |
Savings deposits and money market accounts |  |  | 72,959 |  |  |  | 72,959 |  |  |  | 46,857 |  |  |  | 46,857 |
Time deposits |  |  | 188,195 |  |  |  | 188,453 |  |  |  | 200,841 |  |  |  | 203,453 |
Federal funds purchased and securities sold under agreements to repurchase |  |  | 19,380 |  |  |  | 19,380 |  |  |  | 29,391 |  |  |  | 29,391 |
Federal Home Loan Bank advances and other borrowings |  |  | 37,175 |  |  |  | 37,175 |  |  |  | 43,045 |  |  |  | 43,045 |
Accrued interest payable |  |  | 136 |  |  |  | 136 |  |  |  | 111 |  |  |  | 111 |
Unrecognized financial instruments (net of contract amount): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to extend credit |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Letters of credit |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Lines of credit |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -Subparagraph a, b -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19296-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 14 -Subparagraph a -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph c(2), d, e, f -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 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15 -Subparagraph b-d -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13467-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 19 -Subparagraph a, b, c(1), d(1) -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a, c(1), c(2), c(3), d -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 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -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 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 + Details
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