Loans and allowance for loan losses (2) (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Financing Receivable, Recorded Investment, Aging [Abstract]      
30 to 59 days past due $ 2,489,984 $ 4,135,073  
60 to 89 days past due 3,505,160 3,437,412  
Greater than 90 days 482,368 1,172,237  
Total past due 6,477,512 8,744,722  
Current 367,873,256 419,125,994  
Total loans 374,350,768 427,870,716 436,063,963
Recorded investment, 90 days and accruing 482,368 1,172,237  
Commercial [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
30 to 59 days past due 11,291 1,367,360  
60 to 89 days past due 449,955 408,000  
Greater than 90 days 0 36,770  
Total past due 461,246 1,812,130  
Current 47,954,568 70,808,407  
Total loans 48,415,814 72,620,537  
Recorded investment, 90 days and accruing 0 36,770  
Residential [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
30 to 59 days past due 0 575,200  
60 to 89 days past due 0 251,799  
Greater than 90 days 0 0  
Total past due 0 826,999  
Current 4,937,958 7,079,466  
Total loans 4,937,958 7,906,465  
Recorded investment, 90 days and accruing 0 0  
Total construction and land development [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
30 to 59 days past due 11,291 1,942,560  
60 to 89 days past due 449,955 659,799  
Greater than 90 days 0 36,770  
Total past due 461,246 2,639,129  
Current 52,892,526 77,887,873  
Total loans 53,353,772 80,527,002  
Recorded investment, 90 days and accruing 0 36,770  
Farmland [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
30 to 59 days past due 0 0  
60 to 89 days past due 0 0  
Greater than 90 days 0 0  
Total past due 0 0  
Current 2,591,277 2,464,981  
Total loans 2,591,277 2,464,981 2,026,014
Recorded investment, 90 days and accruing 0 0  
Commercial real estate - owner occupied [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
30 to 59 days past due 0 598,006  
60 to 89 days past due 379,961 36,972  
Greater than 90 days 0 0  
Total past due 379,961 634,978  
Current 96,806,985 104,957,170  
Total loans 97,186,946 105,592,148 103,572,596
Recorded investment, 90 days and accruing 0 0  
Commercial real estate - non-owner occupied [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
30 to 59 days past due 0 55,709  
60 to 89 days past due 718,354 673,561  
Greater than 90 days 0 0  
Total past due 718,354 729,270  
Current 54,575,985 53,329,879  
Total loans 55,294,339 54,059,149 54,463,355
Recorded investment, 90 days and accruing 0 0  
Multifamily [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
30 to 59 days past due 0 111,571  
60 to 89 days past due 0 255,196  
Greater than 90 days 0 0  
Total past due 0 366,767  
Current 7,569,039 6,312,561  
Total loans 7,569,039 6,679,328 6,746,019
Recorded investment, 90 days and accruing 0 0  
Total commercial real estate [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
30 to 59 days past due 0 765,286  
60 to 89 days past due 1,098,315 965,729  
Greater than 90 days 0 0  
Total past due 1,098,315 1,731,015  
Current 161,543,286 167,064,591  
Total loans 162,641,601 168,795,606  
Recorded investment, 90 days and accruing 0 0  
Home equity lines [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
30 to 59 days past due 188,130 323,349  
60 to 89 days past due 782,639 99,494  
Greater than 90 days 97,158 299,783  
Total past due 1,067,927 722,626  
Current 25,644,061 29,964,600  
Total loans 26,711,988 30,687,226 32,950,237
Recorded investment, 90 days and accruing 97,158 299,783  
Secured by 1-4 family residential, secured by first deeds of trust [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
30 to 59 days past due 2,204,913 985,116  
60 to 89 days past due 707,010 1,572,973  
Greater than 90 days 369,792 624,740  
Total past due 3,281,715 3,182,829  
Current 79,205,094 90,035,969  
Total loans 82,486,809 93,218,798 94,589,607
Recorded investment, 90 days and accruing 369,792 624,740  
Secured by 1-4 family residential, secured by second deeds of trust [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
30 to 59 days past due 0 12,673  
60 to 89 days past due 106,287 132,928  
Greater than 90 days 0 156,026  
Total past due 106,287 301,627  
Current 9,786,207 11,740,436  
Total loans 9,892,494 12,042,063 12,495,122
Recorded investment, 90 days and accruing 0 156,026  
Total consumer real estate [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
30 to 59 days past due 2,393,043 1,321,138  
60 to 89 days past due 1,595,936 1,805,395  
Greater than 90 days 466,950 1,080,549  
Total past due 4,455,929 4,207,082  
Current 114,635,362 131,741,005  
Total loans 119,091,291 135,948,087  
Recorded investment, 90 days and accruing 466,950 1,080,549  
Commercial and industrial loans (except those secured by real estate) [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
30 to 59 days past due 68,652 46,392  
60 to 89 days past due 357,954 3,313  
Greater than 90 days 15,418 54,918  
Total past due 442,024 104,623  
Current 35,524,169 37,629,893  
Total loans 35,966,193 37,734,516 37,961,852
Recorded investment, 90 days and accruing 15,418 54,918  
Consumer and other [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
30 to 59 days past due 16,998 59,697  
60 to 89 days past due 3,000 3,176  
Greater than 90 days 0 0  
Total past due 19,998 62,873  
Current 3,277,913 4,802,632  
Total loans 3,297,911 4,865,505 4,791,717
Recorded investment, 90 days and accruing $ 0 $ 0