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Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011 Contract
Troubled debt restructurings that subsequently defaulted
Number of contracts	4
Recorded Investment	$ 596
Commercial and industrial [Member]
Troubled debt restructurings that subsequently defaulted
Number of contracts
Recorded Investment
Consumer and other loans [Member]
Troubled debt restructurings that subsequently defaulted
Number of contracts
Recorded Investment
Other real estate loans [Member] | Real estate loans [Member]
Troubled debt restructurings that subsequently defaulted
Number of contracts	3
Recorded Investment	361
Construction and land development [Member] | Real estate loans [Member]
Troubled debt restructurings that subsequently defaulted
Number of contracts	1
Recorded Investment	235
Secured by 1-4 family residential [Member] | Real estate loans [Member]
Troubled debt restructurings that subsequently defaulted
Number of contracts
Recorded Investment

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953682-111524

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- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953682-111524

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