Loans and allowance for loan losses (1) (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Financing Receivable, Recorded Investment [Line Items]      
Total loans $ 374,350,768 $ 427,870,716 $ 436,063,963
Residential [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 4,937,958 7,906,465  
Commercial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 48,415,814 72,620,537  
Total construction and land development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 53,353,772 80,527,002  
Farmland [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 2,591,277 2,464,981 2,026,014
Commercial real estate - owner occupied [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 97,186,946 105,592,148 103,572,596
Commercial real estate - non-owner occupied [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 55,294,339 54,059,149 54,463,355
Multifamily [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 7,569,039 6,679,328 6,746,019
Total commercial real estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 162,641,601 168,795,606  
Home equity lines [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 26,711,988 30,687,226 32,950,237
Secured by 1-4 family residential, secured by first deeds of trust [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 82,486,809 93,218,798 94,589,607
Secured by 1-4 family residential, secured by second deeds of trust [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 9,892,494 12,042,063 12,495,122
Total consumer real estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 119,091,291 135,948,087  
Commercial and industrial loans (except those secured by real estate) [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 35,966,193 37,734,516 37,961,852
Consumer and other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 3,297,911 4,865,505 4,791,717
Risk Rated 1-4 [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 248,366,907 293,643,385  
Risk Rated 1-4 [Member] | Residential [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 4,074,705 4,943,061  
Risk Rated 1-4 [Member] | Commercial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 26,816,617 44,315,474  
Risk Rated 1-4 [Member] | Total construction and land development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 30,891,322 49,258,535  
Risk Rated 1-4 [Member] | Farmland [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,541,788 2,464,981  
Risk Rated 1-4 [Member] | Commercial real estate - owner occupied [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 69,783,788 46,958,816  
Risk Rated 1-4 [Member] | Commercial real estate - non-owner occupied [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 25,558,925 37,581,904  
Risk Rated 1-4 [Member] | Multifamily [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 4,652,304 5,511,882  
Risk Rated 1-4 [Member] | Total commercial real estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 101,536,805 92,517,583  
Risk Rated 1-4 [Member] | Home equity lines [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 21,960,295 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 54,705,786 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 7,866,200 9,960,928  
Risk Rated 1-4 [Member] | Total consumer real estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 84,532,281 117,035,665  
Risk Rated 1-4 [Member] | Commercial and industrial loans (except those secured by real estate) [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 28,469,590 31,322,834  
Risk Rated 1-4 [Member] | Consumer and other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 2,936,909 3,508,768  
Risk Rated 5 [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 43,318,891 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 5,516,377 0  
Risk Rated 5 [Member] | Total construction and land development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 6,188,086 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 8,412,897 16,352,920  
Risk Rated 5 [Member] | Commercial real estate - non-owner occupied [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 12,118,805 3,036,887  
Risk Rated 5 [Member] | Multifamily [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,751,451 0  
Risk Rated 5 [Member] | Total commercial real estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 22,283,153 19,389,807  
Risk Rated 5 [Member] | Home equity lines [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,889,385 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 10,670,351 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 455,326 706,484  
Risk Rated 5 [Member] | Total consumer real estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 13,015,062 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 1,626,538 4,289,037  
Risk Rated 5 [Member] | Consumer and other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 206,052 384,387  
Risk Rate 6 [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 81,384,311 102,032,486  
Risk Rate 6 [Member] | Residential [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 191,544 2,963,404  
Risk Rate 6 [Member] | Commercial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 15,731,836 28,305,063  
Risk Rate 6 [Member] | Total construction and land development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 15,923,380 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 18,770,066 42,280,412  
Risk Rate 6 [Member] | Commercial real estate - non-owner occupied [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 17,616,609 13,440,358  
Risk Rate 6 [Member] | Multifamily [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,165,284 1,167,446  
Risk Rate 6 [Member] | Total commercial real estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 38,601,448 56,888,216  
Risk Rate 6 [Member] | Home equity lines [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 2,805,308 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 17,110,672 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 1,570,968 1,374,651  
Risk Rate 6 [Member] | Total consumer real estate [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 21,486,948 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 5,217,585 2,122,645  
Risk Rate 6 [Member] | Consumer and other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 154,950 972,350  
Risk Rated 7 [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,280,659 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 350,984 0  
Risk Rated 7 [Member] | Total construction and land development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 350,984 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 220,195 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 220,195 0  
Risk Rated 7 [Member] | Home equity lines [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 57,000 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 57,000 0  
Risk Rated 7 [Member] | Commercial and industrial loans (except those secured by real estate) [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 652,480 0  
Risk Rated 7 [Member] | Consumer and other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Total loans $ 0 $ 0