Business Combinations (Details Textual) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2012
Harrisonburg branch acquisition [Member]
Business Combinations (Textual) [Abstract]
Amount of loans purchased		$ 72,500,000
Deposit liabilities	48,900,000	48,900,000
Company recorded goodwill amount	1,800,000	1,800,000
Core deposit intangible	9,500	9,500
Fair value inputs discount value		1,700,000
Fair value estimate loan portfolio	70,500,000	70,500,000
Impaired loan portfolio fair value estimate	276,000	276,000
Interest income	640,000
First Market Bank Acquisition [Member]
Business Combinations (Textual) [Abstract]
Interest income	$ 6,500,000

Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 52

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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)

-Number 141

-Paragraph 53

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Name:	us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant