Loan commitments (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Loan commitments and lines of credit - Construction and land development [Member]
Outstanding loan commitments and lines of credit [Abstract]
Outstanding loan commitments and lines of credit	$ 2,010,250	$ 1,999,670
Loan commitments and lines of credit - Other [Member]
Outstanding loan commitments and lines of credit [Abstract]
Outstanding loan commitments and lines of credit	22,048,911	22,346,026
Loan commitments and lines of credit [Member]
Outstanding loan commitments and lines of credit [Abstract]
Outstanding loan commitments and lines of credit	24,059,161	24,345,696
Standby letters of credit [Member]
Standby letters of credit [Abstract]
Standby letters of credit	$ 1,456,162	$ 1,486,677