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Disclosures About Fair Value of Financial Instruments - Fair value measurements of assets and liabilities on recurring basis (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Available-for-sale securities
Investment securities available for sale	$ 113,770	$ 104,689
Fair Value \| Fair Value, Measurements, Recurring
Available-for-sale securities
Investment securities available for sale	113,770	104,689
Fair Value \| Fair Value, Measurements, Recurring \| Federal agencies
Available-for-sale securities
Investment securities available for sale	43,409	37,917
Fair Value \| Fair Value, Measurements, Recurring \| State and municipal
Available-for-sale securities
Investment securities available for sale	31,162	28,715
Fair Value \| Fair Value, Measurements, Recurring \| Government-Sponsored Enterprise (Gse) Residential Mortgage-Backed and Other Asset-Backed Agency Securities
Available-for-sale securities
Investment securities available for sale	36,022	34,697
Fair Value \| Fair Value, Measurements, Recurring \| Corporate
Available-for-sale securities
Investment securities available for sale	3,177	3,360
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fair Value, Measurements, Recurring
Available-for-sale securities
Investment securities available for sale
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fair Value, Measurements, Recurring \| Federal agencies
Available-for-sale securities
Investment securities available for sale
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fair Value, Measurements, Recurring \| State and municipal
Available-for-sale securities
Investment securities available for sale
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fair Value, Measurements, Recurring \| Government-Sponsored Enterprise (Gse) Residential Mortgage-Backed and Other Asset-Backed Agency Securities
Available-for-sale securities
Investment securities available for sale
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fair Value, Measurements, Recurring \| Corporate
Available-for-sale securities
Investment securities available for sale
Fair Value Measurements Using Significant Other Observable Inputs ( Level 2) \| Fair Value, Measurements, Recurring
Available-for-sale securities
Investment securities available for sale	112,573	103,599
Fair Value Measurements Using Significant Other Observable Inputs ( Level 2) \| Fair Value, Measurements, Recurring \| Federal agencies
Available-for-sale securities
Investment securities available for sale	43,409	37,917
Fair Value Measurements Using Significant Other Observable Inputs ( Level 2) \| Fair Value, Measurements, Recurring \| State and municipal
Available-for-sale securities
Investment securities available for sale	31,162	28,715
Fair Value Measurements Using Significant Other Observable Inputs ( Level 2) \| Fair Value, Measurements, Recurring \| Government-Sponsored Enterprise (Gse) Residential Mortgage-Backed and Other Asset-Backed Agency Securities
Available-for-sale securities
Investment securities available for sale	36,022	34,697
Fair Value Measurements Using Significant Other Observable Inputs ( Level 2) \| Fair Value, Measurements, Recurring \| Corporate
Available-for-sale securities
Investment securities available for sale	1,980	2,270
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) \| Fair Value, Measurements, Recurring
Available-for-sale securities
Investment securities available for sale	1,197	1,090
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) \| Fair Value, Measurements, Recurring \| Federal agencies
Available-for-sale securities
Investment securities available for sale
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) \| Fair Value, Measurements, Recurring \| State and municipal
Available-for-sale securities
Investment securities available for sale
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) \| Fair Value, Measurements, Recurring \| Government-Sponsored Enterprise (Gse) Residential Mortgage-Backed and Other Asset-Backed Agency Securities
Available-for-sale securities
Investment securities available for sale
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) \| Fair Value, Measurements, Recurring \| Corporate
Available-for-sale securities
Investment securities available for sale	$ 1,197	$ 1,090

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