Allowance for loan losses (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Activity in allowance for loan losses [Roll Forward]
Beginning Balance	$ 10,807,827	$ 16,071,424
Provision for Loan Losses	1,173,000	9,095,000
Charge-offs	(5,659,018)	(14,899,696)
Recoveries	916,855	541,099
Ending Balance	7,238,664	10,807,827
Loans individually evaluated for impairment	135,531,225	178,792,352
Loans collectively evaluated for impairment	151,031,477	176,117,914
Total loans	286,562,702	354,910,266
Residential [Member]
Activity in allowance for loan losses [Roll Forward]
Beginning Balance	494,742	704,728
Provision for Loan Losses	(462,542)	542,067
Charge-offs	0	(797,286)
Recoveries	101,800	45,233
Ending Balance	134,000	494,742
Loans individually evaluated for impairment	575,720	1,247,709
Loans collectively evaluated for impairment	2,355,184	1,597,885
Total loans	2,930,904	2,845,594
Commercial [Member]
Activity in allowance for loan losses [Roll Forward]
Beginning Balance	4,611,410	6,798,177
Provision for Loan Losses	(3,481,833)	3,444,160
Charge-offs	(278,703)	(5,645,064)
Recoveries	424,126	14,137
Ending Balance	1,275,000	4,611,410
Loans individually evaluated for impairment	15,591,987	27,351,857
Loans collectively evaluated for impairment	12,586,649	13,857,974
Total loans	28,178,636	41,209,831
Total construction and land development [Member]
Activity in allowance for loan losses [Roll Forward]
Beginning Balance	5,106,152	7,502,905
Provision for Loan Losses	(3,944,375)	3,986,227
Charge-offs	(278,703)	(6,442,350)
Recoveries	525,926	59,370
Ending Balance	1,409,000	5,106,152
Total loans	31,109,540	44,055,425
Commercial real estate - owner occupied [Member]
Activity in allowance for loan losses [Roll Forward]
Beginning Balance	1,358,863	1,496,466
Provision for Loan Losses	252,484	623,552
Charge-offs	(453,996)	(961,155)
Recoveries	42,649	200,000
Ending Balance	1,200,000	1,358,863
Loans individually evaluated for impairment	53,126,045	67,167,587
Loans collectively evaluated for impairment	20,458,351	25,604,945
Total loans	73,584,396	92,772,532
Commercial real estate - non-owner occupied [Member]
Activity in allowance for loan losses [Roll Forward]
Beginning Balance	816,852	1,548,899
Provision for Loan Losses	451,603	(300,898)
Charge-offs	(619,455)	(431,354)
Recoveries	20,000	205
Ending Balance	669,000	816,852
Loans individually evaluated for impairment	34,367,226	41,801,577
Loans collectively evaluated for impairment	9,500,842	12,749,240
Total loans	43,868,068	54,550,817
Multifamily [Member]
Activity in allowance for loan losses [Roll Forward]
Beginning Balance	23,434	406,635
Provision for Loan Losses	(4,434)	(373,238)
Charge-offs	0	(9,963)
Recoveries	0	0
Ending Balance	19,000	23,434
Loans individually evaluated for impairment	9,363,418	6,461,639
Loans collectively evaluated for impairment	2,196,464	1,516,750
Total loans	11,559,882	7,978,389
Farmland [Member]
Activity in allowance for loan losses [Roll Forward]
Beginning Balance	0	0
Provision for Loan Losses	1,233,000	0
Charge-offs	(896,000)	0
Recoveries	0	0
Ending Balance	337,000	0
Loans individually evaluated for impairment	778,599	1,391,501
Loans collectively evaluated for impairment	684,712	1,189,796
Total loans	1,463,311	2,581,297
Total commercial real estate [Member]
Activity in allowance for loan losses [Roll Forward]
Beginning Balance	2,199,149	3,452,000
Provision for Loan Losses	1,932,653	(50,584)
Charge-offs	(1,969,451)	(1,402,472)
Recoveries	62,649	200,205
Ending Balance	2,225,000	2,199,149
Total loans	130,475,657	157,883,035
Home equity lines [Member]
Activity in allowance for loan losses [Roll Forward]
Beginning Balance	658,135	860,307
Provision for Loan Losses	23,284	668,614
Charge-offs	(266,119)	(883,848)
Recoveries	8,700	13,062
Ending Balance	424,000	658,135
Loans individually evaluated for impairment	1,381,700	2,185,040
Loans collectively evaluated for impairment	19,864,332	23,336,357
Total loans	21,246,032	25,521,397
Secured by 1-4 family residential, secured by first deed of trust [Member]
Activity in allowance for loan losses [Roll Forward]
Beginning Balance	1,358,102	1,881,470
Provision for Loan Losses	2,492,702	2,610,905
Charge-offs	(1,953,177)	(3,220,072)
Recoveries	94,373	85,799
Ending Balance	1,992,000	1,358,102
Loans individually evaluated for impairment	8,968,659	15,526,551
Loans collectively evaluated for impairment	57,903,985	65,261,874
Total loans	66,872,644	80,788,425
Secured by 1-4 family residential, secured by second deed of trust [Member]
Activity in allowance for loan losses [Roll Forward]
Beginning Balance	223,307	397,504
Provision for Loan Losses	498,415	468,192
Charge-offs	(367,200)	(663,135)
Recoveries	38,478	20,746
Ending Balance	393,000	223,307
Loans individually evaluated for impairment	532,977	557,600
Loans collectively evaluated for impairment	8,142,241	8,959,645
Total loans	8,675,218	9,517,245
Total consumer real estate [Member]
Activity in allowance for loan losses [Roll Forward]
Beginning Balance	2,239,544	3,139,281
Provision for Loan Losses	3,014,401	3,747,711
Charge-offs	(2,586,496)	(4,767,055)
Recoveries	141,551	119,607
Ending Balance	2,809,000	2,239,544
Total loans	96,793,894	115,827,067
Commercial and industrial loans (except those secured by real estate) [Member]
Activity in allowance for loan losses [Roll Forward]
Beginning Balance	1,161,654	1,655,713
Provision for Loan Losses	144,821	1,230,555
Charge-offs	(759,726)	(1,879,517)
Recoveries	177,251	154,903
Ending Balance	724,000	1,161,654
Loans individually evaluated for impairment	10,844,894	15,101,291
Loans collectively evaluated for impairment	15,408,947	19,282,826
Total loans	26,253,841	34,384,117
Consumer and other [Member]
Activity in allowance for loan losses [Roll Forward]
Beginning Balance	101,328	321,525
Provision for Loan Losses	25,500	181,091
Charge-offs	(64,642)	(408,302)
Recoveries	9,478	7,014
Ending Balance	71,664	101,328
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	1,929,770	2,760,622
Total loans	$ 1,929,770	$ 2,760,622