Annual report pursuant to Section 13 and 15(d)

Acquisitions (Details Textual)

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Acquisitions (Details Textual) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Feb. 28, 2010
First Market Bank Acquisition [Member]
Dec. 31, 2012
First Market Bank Acquisition [Member]
Dec. 31, 2012
First Market Bank Acquisition [Member]
Dec. 31, 2011
First Market Bank Acquisition [Member]
Feb. 28, 2010
First Market Bank Acquisition [Member]
Core Deposits [Member]
Feb. 28, 2010
First Market Bank Acquisition [Member]
Trademarks [Member]
Feb. 28, 2010
First Market Bank Acquisition [Member]
Series B Perpetual Preferred Stock [Member]
Feb. 28, 2010
First Market Bank Acquisition [Member]
Series C Perpetual Preferred Stock [Member]
Feb. 28, 2010
First Market Bank Acquisition [Member]
Common Stock [Member]
Feb. 28, 2010
First Market Bank Acquisition [Member]
Series A Perpetual Preferred Stock [Member]
Dec. 31, 2012
Harrisonburg branch acquisition [Member]
Dec. 31, 2011
Harrisonburg branch acquisition [Member]
May 20, 2011
Harrisonburg branch acquisition [Member]
Acquisitions (Textual) [Abstract]                          
Amount of loans purchased                         $ 72,500,000
Deposit liabilities                         48,900,000
Core deposit intangible                         9,500
Fair value discount                         1,700,000
Fair value estimate loan portfolio                         70,500,000
Impaired loan portfolio fair value estimate                         276,000
Interest income     25,300,000 36,900,000             2,600,000 3,300,000  
Acquisition-related costs                     0 426,000  
Common stock shares received 6,273.259                        
Common stock shares issued 7,477,273           35,595 35,595 6,701,478 775,795      
Acquisition date fair value                   96,100,000      
Company recorded goodwill amount 1,100,000                       1,800,000
Assets acquired 1,400,000,000                        
Assets acquired, net loans 981,500,000                        
Investment in securities 218,700,000                        
Liabilities assumed 1,300,000,000                        
Liabilities Deposits 1,200,000,000                        
Intangible acquired         26,400,000 1,200,000              
Amortization period         4 years 3 months 18 days 3 years              
Impairment charges   $ 0                 $ 0