Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financial assets measured at fair value on a recurring basis
Securities available for sale	$ 86,436	$ 73,804
Fair Value, Measurements, Recurring [Member]
Financial assets measured at fair value on a recurring basis
Securities available for sale	86,436	73,804
Fair Value, Measurements, Recurring [Member] \| U.S. agency securities [Member]
Financial assets measured at fair value on a recurring basis
Securities available for sale	3,731	5,665
Fair Value, Measurements, Recurring [Member] \| Mortgage-backed securities [Member]
Financial assets measured at fair value on a recurring basis
Securities available for sale	79,666	65,312
Fair Value, Measurements, Recurring [Member] \| Corporate securities [Member]
Financial assets measured at fair value on a recurring basis
Securities available for sale	1,968	1,772
Fair Value, Measurements, Recurring [Member] \| Equity securities [Member]
Financial assets measured at fair value on a recurring basis
Securities available for sale	1,071	1,055
Fair Value, Measurements, Recurring [Member] \| (Level 1) Quoted Prices in Active Markets for Identical Assets [Member]
Financial assets measured at fair value on a recurring basis
Securities available for sale	476	460
Fair Value, Measurements, Recurring [Member] \| (Level 1) Quoted Prices in Active Markets for Identical Assets [Member] \| Equity securities [Member]
Financial assets measured at fair value on a recurring basis
Securities available for sale	476	460
Fair Value, Measurements, Recurring [Member] \| (Level 2) Significant Other Observable Inputs [Member]
Financial assets measured at fair value on a recurring basis
Securities available for sale	85,365	72,749
Fair Value, Measurements, Recurring [Member] \| (Level 2) Significant Other Observable Inputs [Member] \| U.S. agency securities [Member]
Financial assets measured at fair value on a recurring basis
Securities available for sale	3,731	5,665
Fair Value, Measurements, Recurring [Member] \| (Level 2) Significant Other Observable Inputs [Member] \| Mortgage-backed securities [Member]
Financial assets measured at fair value on a recurring basis
Securities available for sale	79,666	65,312
Fair Value, Measurements, Recurring [Member] \| (Level 2) Significant Other Observable Inputs [Member] \| Corporate securities [Member]
Financial assets measured at fair value on a recurring basis
Securities available for sale	1,968	1,772
Fair Value, Measurements, Recurring [Member] \| (Level 3) Significant Unobservable Inputs [Member]
Financial assets measured at fair value on a recurring basis
Securities available for sale	595	595
Fair Value, Measurements, Recurring [Member] \| (Level 3) Significant Unobservable Inputs [Member] \| Equity securities [Member]
Financial assets measured at fair value on a recurring basis
Securities available for sale	$ 595	$ 595

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

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-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)

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-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

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-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

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-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

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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-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

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-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

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-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)

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+ Details

FIRST COMMUNITY FINANCIAL CORP 10-K