Allowance for Loan Losses (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Allowance for loan losses:
Allowance for loan losses, beginning of period	$ 17,979	$ 15,915	$ 16,574	$ 14,053
Loans charged off	(728)	(1,283)	(1,787)	(2,252)
Recoveries	157	170	621	601
Provision	1,250	1,200	3,250	3,600
Allowance for loan losses, end of period	18,658	16,002	18,658	16,002
Construction and Land Development [Member]
Allowance for loan losses:
Allowance for loan losses, beginning of period	2,889	2,572	2,893	1,752
Loans charged off		(900)		(900)
Recoveries
Provision	140	1,312	136	2,132
Allowance for loan losses, end of period	3,029	2,984	3,029	2,984
Commercial and Industrial [Member]
Allowance for loan losses:
Allowance for loan losses, beginning of period	3,466	3,575	3,139	3,163
Loans charged off	(532)	(203)	(931)	(585)
Recoveries	38	66	243	222
Provision	133	(217)	654	421
Allowance for loan losses, end of period	3,105	3,221	3,105	3,221
Commercial Real Estate [Member]
Allowance for loan losses:
Allowance for loan losses, beginning of period	7,754	6,321	6,566	5,671
Loans charged off
Recoveries	2		5
Provision	967	(364)	2,152	286
Allowance for loan losses, end of period	8,723	5,957	8,723	5,957
Residential Real Estate [Member]
Allowance for loan losses:
Allowance for loan losses, beginning of period	1,793	1,745	1,886	1,718
Loans charged off	(49)		(110)	(281)
Recoveries	2	4	11	19
Provision	240	31	199	324
Allowance for loan losses, end of period	1,986	1,780	1,986	1,780
Consumer [Member]
Allowance for loan losses:
Allowance for loan losses, beginning of period	293	291	356	298
Loans charged off	(147)	(180)	(587)	(485)
Recoveries	99	100	346	360
Provision	52	81	182	119
Allowance for loan losses, end of period	297	292	297	292
Home Equity [Member]
Allowance for loan losses:
Allowance for loan losses, beginning of period	681	775	704	725
Loans charged off			(159)	(1)
Recoveries	16		16
Provision	176	8	312	59
Allowance for loan losses, end of period	873	783	873	783
Unallocated [Member]
Allowance for loan losses:
Allowance for loan losses, beginning of period	1,103	636	1,030	726
Loans charged off
Recoveries
Provision	(458)	349	(385)	259
Allowance for loan losses, end of period	$ 645	$ 985	$ 645	$ 985

Reflects the gross amount charged against earnings during the period as credit losses (bad debt expense) based on review of the loan and lease portfolio and application of the methodology for estimating credit losses.

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Reflects a reduction in bad debt expense attributable to collections of loans and lease receivables which had previously been fully or partially charged off as bad debts.

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- Definition

Reflects the amount of loans and leases that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities.

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 8, 9

-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 Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph a(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 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

Reference 6: 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 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

+ Details