Loans (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for loan losses
Allowance for loan losses, Beginning Balance	$ 12,615	$ 10,820	$ 9,795
Charge-offs	(5,190)	(3,356)	(4,371)
Recoveries	254	214	238
Net charge-offs			(4,133)
Provision for loan losses	6,381	4,937	5,158
Allowance for loan losses, Ending Balance	14,060	12,615	10,820
Commercial, Industrial, and Agricultural [Member]
Allowance for loan losses
Allowance for loan losses, Beginning Balance	4,511	3,517
Charge-offs	(2,871)	(1,796)
Recoveries	45	9
Provision for loan losses	3,255	2,781
Allowance for loan losses, Ending Balance	4,940	4,511
Commercial Mortgages [Member]
Allowance for loan losses
Allowance for loan losses, Beginning Balance	4,470	3,511
Charge-offs	(401)	(175)
Recoveries
Provision for loan losses	628	1,134
Allowance for loan losses, Ending Balance	4,697	4,470
Residential real estate [Member]
Allowance for loan losses
Allowance for loan losses, Beginning Balance	1,991	1,916
Charge-offs	(304)	(217)
Recoveries	1	13
Provision for loan losses	778	279
Allowance for loan losses, Ending Balance	2,466	1,991
Consumer [Member]
Allowance for loan losses
Allowance for loan losses, Beginning Balance	1,404	1,561
Charge-offs	(1,279)	(907)
Recoveries	91	88
Provision for loan losses	1,483	662
Allowance for loan losses, Ending Balance	1,699	1,404
Credit cards [Member]
Allowance for loan losses
Allowance for loan losses, Beginning Balance	71	96
Charge-offs	(78)	(39)
Recoveries	18	10
Provision for loan losses	72	4
Allowance for loan losses, Ending Balance	83	71
Overdrafts [Member]
Allowance for loan losses
Allowance for loan losses, Beginning Balance	168	219
Charge-offs	(257)	(222)
Recoveries	99	94
Provision for loan losses	165	77
Allowance for loan losses, Ending Balance	$ 175	$ 168

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.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

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-Subparagraph (a)

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

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A valuation allowance for financing receivables that are expected to be uncollectible.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of direct write-downs of financing receivables charged against the allowance.

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-Name Accounting Standards Codification

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The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 9

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

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-Name Accounting Standards Codification

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

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

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 168, 169, 170

-IssueDate 2006-05-01

-Chapter 5

-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.

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