Impaired Loans and Allowance for Loan Losses (Details Textual) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Impaired Loans and Valuation Allowance for Loan Losses (Textual) [Abstract]
Newly identified TDRs	$ 18,000,000
Impaired Loans and Valuation Allowance for Loan Losses (Additional Textual) [Abstract]
Loan default period	90 days
Accruing TDRs	41,900,000	71,600,000
Average recorded investment in impaired loans	96,439,000	119,528,000	149,058,000
Interest income on impaired loans	3,054,000	3,541,000	2,671,000
Impaired Loans, Interest Income Recognized due to change in present value	1,000,000	1,100,000
Nonaccrual loans and loans past due ninety days	40,955,000	28,526,000	68,284,000
Accrual Loans	1,000	0	0
Construction and land development [Member]
Impaired Loans and Valuation Allowance for Loan Losses (Textual) [Abstract]
Newly identified TDRs	100,000
Commercial real estate [Member]
Impaired Loans and Valuation Allowance for Loan Losses (Textual) [Abstract]
Newly identified TDRs	800,000
Residential real estate [Member]
Impaired Loans and Valuation Allowance for Loan Losses (Textual) [Abstract]
Newly identified TDRs	4,900,000
Consumer [Member]
Impaired Loans and Valuation Allowance for Loan Losses (Textual) [Abstract]
Newly identified TDRs	$ 100,000

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- Definition

Loan default period.

+ References

No definition available.

+ Details

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- Definition

New troubled debt restructuring identified amount.

+ References

No definition available.

+ Details

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- Definition

Troubled debt restructuring outstanding.

+ References

No definition available.

+ Details

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- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5111-111524

+ Details

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- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

+ Details

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- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524

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- Definition

The amount of interest income on impaired and nonperforming loans that is due to the change in present value attributable to the passage of time.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 19

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5278-111524

+ Details

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- Definition

The gross interest income that would have been recorded in the period on troubled debt restructurings, if the loans had been current in accordance with their original terms and had been outstanding throughout the period or since origination, if held for part of the period.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

-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 OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph j(ii)

-Chapter V

-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 15

-Paragraph 40

-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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