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Disclosures About Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Assets and liability measured at fair value on a recurring basis |  |
Available for sale | $ 167,109 | $ 182,923
U.S. Agency Securities [Member] |  |
Assets and liability measured at fair value on a recurring basis |  |
Available for sale | 6,928 | 10,709
U.S. Agency mortgage-backed securities [Member] |  |
Assets and liability measured at fair value on a recurring basis |  |
Available for sale | 153,248 | 172,214
Fair Value Measurements, Recurring Basis [Member] |  |
Assets and liability measured at fair value on a recurring basis |  |
Fair value of swap asset | 220 | 346
Fair value of swap liability | 220 | 346
Fair Value Measurements, Recurring Basis [Member] | U.S. Agency Securities [Member] |  |
Assets and liability measured at fair value on a recurring basis |  |
Available for sale | 6,928 | 10,709
Fair Value Measurements, Recurring Basis [Member] | U.S. Agency mortgage-backed securities [Member] |  |
Assets and liability measured at fair value on a recurring basis |  |
Available for sale | 153,248 | 172,214
Fair Value Measurements, Recurring Basis [Member] | Other Securities [Member] |  |
Assets and liability measured at fair value on a recurring basis |  |
Available for sale | 6,933 |
Fair Value Measurements, Recurring Basis [Member] | Level 1 [Member] |  |
Assets and liability measured at fair value on a recurring basis |  |
Fair value of swap asset |  |
Fair value of swap liability |  |
Fair Value Measurements, Recurring Basis [Member] | Level 1 [Member] | U.S. Agency Securities [Member] |  |
Assets and liability measured at fair value on a recurring basis |  |
Available for sale |  |
Fair Value Measurements, Recurring Basis [Member] | Level 1 [Member] | U.S. Agency mortgage-backed securities [Member] |  |
Assets and liability measured at fair value on a recurring basis |  |
Available for sale |  |
Fair Value Measurements, Recurring Basis [Member] | Level 1 [Member] | Other Securities [Member] |  |
Assets and liability measured at fair value on a recurring basis |  |
Available for sale |  |
Fair Value Measurements, Recurring Basis [Member] | Level 2 [Member] |  |
Assets and liability measured at fair value on a recurring basis |  |
Fair value of swap asset | 220 | 346
Fair value of swap liability | 220 | 346
Fair Value Measurements, Recurring Basis [Member] | Level 2 [Member] | U.S. Agency Securities [Member] |  |
Assets and liability measured at fair value on a recurring basis |  |
Available for sale | 6,928 | 10,709
Fair Value Measurements, Recurring Basis [Member] | Level 2 [Member] | U.S. Agency mortgage-backed securities [Member] |  |
Assets and liability measured at fair value on a recurring basis |  |
Available for sale | 153,248 | 172,214
Fair Value Measurements, Recurring Basis [Member] | Level 2 [Member] | Other Securities [Member] |  |
Assets and liability measured at fair value on a recurring basis |  |
Available for sale | 6,933 |
Fair Value Measurements, Recurring Basis [Member] | Level 3 [Member] |  |
Assets and liability measured at fair value on a recurring basis |  |
Fair value of swap asset |  |
Fair value of swap liability |  |
Fair Value Measurements, Recurring Basis [Member] | Level 3 [Member] | U.S. Agency Securities [Member] |  |
Assets and liability measured at fair value on a recurring basis |  |
Available for sale |  |
Fair Value Measurements, Recurring Basis [Member] | Level 3 [Member] | U.S. Agency mortgage-backed securities [Member] |  |
Assets and liability measured at fair value on a recurring basis |  |
Available for sale |  |
Fair Value Measurements, Recurring Basis [Member] | Level 3 [Member] | Other Securities [Member] |  |
Assets and liability measured at fair value on a recurring basis |  |
Available for sale |  |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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 115 -Paragraph 12 -Subparagraph 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15E -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 -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 133 -Paragraph 22 -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. + Details
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- Definition Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B -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 133 -Paragraph 4, 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 + Details
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