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Business Segments (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
segment
Mar. 31, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Net interest income $ 3,921,000 $ 3,866,000  
Provision for loan losses 235,000 750,000 2,289,000
Net interest income after provision for loan losses 3,686,000 3,116,000  
Noninterest income 964,000 671,000  
Noninterest expense 3,531,000 3,284,000  
Income before income taxes 1,119,000 503,000  
Income tax expense 331,000 143,000  
Net income 788,000 360,000  
Total assets 428,086,000 433,372,000 441,381,000
Number of reportable segments 2    
Community Banking [Member]
      
Segment Reporting Information [Line Items]      
Net interest income 3,921,000 3,866,000  
Provision for loan losses 235,000 750,000  
Net interest income after provision for loan losses 3,686,000 3,116,000  
Noninterest income 645,000 445,000  
Noninterest expense 3,278,000 3,089,000  
Income before income taxes 1,053,000 472,000  
Income tax expense 309,000 132,000  
Net income 744,000 340,000  
Total assets 427,233,000 432,291,000  
Mortgage [Member]
      
Segment Reporting Information [Line Items]      
Noninterest income 319,000 226,000  
Noninterest expense 253,000 195,000  
Income before income taxes 66,000 31,000  
Income tax expense 22,000 11,000  
Net income 44,000 20,000  
Total assets $ 853,000 $ 1,081,000