Loans and allowance for loan losses (1) (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Financing Receivable, Recorded Investment [Line Items]      
Total loans $ 393,035,350 $ 427,870,716 $ 443,009,356
Residential [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 7,441,924 7,906,465  
Commercial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 55,828,402 72,620,537  
Total construction and land development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 63,270,326 80,527,002  
Farmland [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 2,446,799 2,464,981 2,174,778
Commercial real estate - owner occupied [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 100,149,232 105,592,148 101,312,721
Commercial real estate - non-owner occupied [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 55,890,873 54,059,149 56,714,123
Multifamily [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 6,960,355 6,679,328 8,432,747
Total commercial real estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 165,447,259 168,795,606  
Home equity lines [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 28,365,175 30,687,226 34,897,108
Secured by 1-4 family residential, secured by first deeds of trust [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 84,774,463 93,218,798 96,604,638
Secured by 1-4 family residential, secured by second deeds of trust [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 10,095,119 12,042,063 13,114,473
Total consumer real estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 123,234,757 135,948,087  
Commercial and industrial loans (except those secured by real estate) [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 37,529,213 37,734,516 39,920,444
Consumer and other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 3,553,795 4,865,505 4,735,670
Risk Rated 1-4 [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 262,763,318 293,643,385  
Risk Rated 1-4 [Member] | Residential [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 6,197,776 4,943,061  
Risk Rated 1-4 [Member] | Commercial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 29,535,994 44,315,474  
Risk Rated 1-4 [Member] | Total construction and land development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 35,733,770 49,258,535  
Risk Rated 1-4 [Member] | Farmland [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,397,310 2,464,981  
Risk Rated 1-4 [Member] | Commercial real estate - owner occupied [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 73,149,268 46,958,816  
Risk Rated 1-4 [Member] | Commercial real estate - non-owner occupied [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 25,607,380 37,581,904  
Risk Rated 1-4 [Member] | Multifamily [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 4,702,665 5,511,882  
Risk Rated 1-4 [Member] | Total commercial real estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 104,856,623 92,517,583  
Risk Rated 1-4 [Member] | Home equity lines [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 22,888,912 26,403,850  
Risk Rated 1-4 [Member] | Secured by 1-4 family residential, secured by first deeds of trust [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 58,547,748 80,670,887  
Risk Rated 1-4 [Member] | Secured by 1-4 family residential, secured by second deeds of trust [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 8,218,980 9,960,928  
Risk Rated 1-4 [Member] | Total consumer real estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 89,655,640 117,035,665  
Risk Rated 1-4 [Member] | Commercial and industrial loans (except those secured by real estate) [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 29,206,043 31,322,834  
Risk Rated 1-4 [Member] | Consumer and other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 3,311,242 3,508,768  
Risk Rated 5 [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 37,430,239 32,194,845  
Risk Rated 5 [Member] | Residential [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 671,709    
Risk Rated 5 [Member] | Commercial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,403,600 0  
Risk Rated 5 [Member] | Total construction and land development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 2,075,309 0  
Risk Rated 5 [Member] | Farmland [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans   0  
Risk Rated 5 [Member] | Commercial real estate - owner occupied [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 11,261,166 16,352,920  
Risk Rated 5 [Member] | Commercial real estate - non-owner occupied [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 11,142,004 3,036,887  
Risk Rated 5 [Member] | Multifamily [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,091,058 0  
Risk Rated 5 [Member] | Total commercial real estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 23,494,228 19,389,807  
Risk Rated 5 [Member] | Home equity lines [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 2,267,061 1,373,002  
Risk Rated 5 [Member] | Secured by 1-4 family residential, secured by first deeds of trust [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 7,258,617 6,052,128  
Risk Rated 5 [Member] | Secured by 1-4 family residential, secured by second deeds of trust [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 419,994 706,484  
Risk Rated 5 [Member] | Total consumer real estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 9,945,672 8,131,614  
Risk Rated 5 [Member] | Commercial and industrial loans (except those secured by real estate) [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,732,430 4,289,037  
Risk Rated 5 [Member] | Consumer and other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 182,600 384,387  
Risk Rate 6 [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 91,158,118 102,032,486  
Risk Rate 6 [Member] | Residential [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 572,439 2,963,404  
Risk Rate 6 [Member] | Commercial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 24,388,336 28,305,063  
Risk Rate 6 [Member] | Total construction and land development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 24,960,775 31,268,467  
Risk Rate 6 [Member] | Farmland [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,049,489 0  
Risk Rate 6 [Member] | Commercial real estate - owner occupied [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 15,480,900 42,280,412  
Risk Rate 6 [Member] | Commercial real estate - non-owner occupied [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 19,141,489 13,440,358  
Risk Rate 6 [Member] | Multifamily [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,166,632 1,167,446  
Risk Rate 6 [Member] | Total commercial real estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 36,838,510 56,888,216  
Risk Rate 6 [Member] | Home equity lines [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 3,134,202 2,910,374  
Risk Rate 6 [Member] | Secured by 1-4 family residential, secured by first deeds of trust [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 18,968,098 6,495,783  
Risk Rate 6 [Member] | Secured by 1-4 family residential, secured by second deeds of trust [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,456,145 1,374,651  
Risk Rate 6 [Member] | Total consumer real estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 23,558,445 10,780,808  
Risk Rate 6 [Member] | Commercial and industrial loans (except those secured by real estate) [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 5,740,435 2,122,645  
Risk Rate 6 [Member] | Consumer and other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 59,953 972,350  
Risk Rated 7 [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,683,675 0  
Risk Rated 7 [Member] | Residential [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 0 0  
Risk Rated 7 [Member] | Commercial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 500,472 0  
Risk Rated 7 [Member] | Total construction and land development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 500,472 0  
Risk Rated 7 [Member] | Farmland [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 0 0  
Risk Rated 7 [Member] | Commercial real estate - owner occupied [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 257,898 0  
Risk Rated 7 [Member] | Commercial real estate - non-owner occupied [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 0 0  
Risk Rated 7 [Member] | Multifamily [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 0 0  
Risk Rated 7 [Member] | Total commercial real estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 257,898 0  
Risk Rated 7 [Member] | Home equity lines [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 75,000 0  
Risk Rated 7 [Member] | Secured by 1-4 family residential, secured by first deeds of trust [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 0 0  
Risk Rated 7 [Member] | Secured by 1-4 family residential, secured by second deeds of trust [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 0 0  
Risk Rated 7 [Member] | Total consumer real estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 75,000 0  
Risk Rated 7 [Member] | Commercial and industrial loans (except those secured by real estate) [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 850,305 0  
Risk Rated 7 [Member] | Consumer and other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans $ 0 $ 0