Allowance for Loan Losses - Allowance for Loan Losses by Loan Components (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Allowance for credit losses:
Beginning balance			$ 3,403,098	$ 3,880,581
Charge-offs			(312,500)	(1,162,088)
Recoveries			61,149	234,312
Provision	12,317	41,384	148,113	780,372
Ending balance	3,299,860	3,733,177	3,299,860	3,733,177
Ending balance: individually evaluated for impairment	380,819	528,682	380,819	528,682
Ending balance: collectively evaluated for impairment	2,919,041	3,204,495	2,919,041	3,204,495
Ending balance: loans acquired with deteriorated credit quality
Loans Receivable:
Ending balance	181,545,636	186,884,417	181,545,636	186,884,417	176,687,329
Ending balance: individually evaluated for impairment	5,830,112	6,279,086	5,830,112	6,279,086
Ending balance: collectively evaluated for impairment	175,715,524	180,605,331	175,715,524	180,605,331
Ending balance: loans acquired with deteriorated credit quality
Construction and Land Development [Member]
Allowance for credit losses:
Beginning balance			86,300	103,200
Charge-offs				(7,286)
Recoveries			533	250
Provision			(4,833)	8,105
Ending balance	82,000	104,269	82,000	104,269
Ending balance: individually evaluated for impairment		3,869		3,869
Ending balance: collectively evaluated for impairment	82,000	100,400	82,000	100,400
Ending balance: loans acquired with deteriorated credit quality
Loans Receivable:
Ending balance	4,941,654	5,585,372	4,941,654	5,585,372	4,873,512
Ending balance: individually evaluated for impairment	85,562	88,429	85,562	88,429
Ending balance: collectively evaluated for impairment	4,856,092	5,496,943	4,856,092	5,496,943
Ending balance: loans acquired with deteriorated credit quality
Residential, 1-4 Families [Member]
Allowance for credit losses:
Beginning balance			668,700	836,860
Charge-offs			(26,967)	(271,224)
Recoveries			402	752
Provision			38,717	142,712
Ending balance	680,852	709,100	680,852	709,100
Ending balance: individually evaluated for impairment	11,652		11,652
Ending balance: collectively evaluated for impairment	669,200	709,100	669,200	709,100
Ending balance: loans acquired with deteriorated credit quality
Loans Receivable:
Ending balance	38,040,049	36,853,785	38,040,049	36,853,785	36,091,051
Ending balance: individually evaluated for impairment	330,199	290,489	330,199	290,489
Ending balance: collectively evaluated for impairment	37,709,850	36,563,296	37,709,850	36,563,296
Ending balance: loans acquired with deteriorated credit quality
Nonfarm, Nonresidential [Member]
Allowance for credit losses:
Beginning balance			801,999	865,854
Charge-offs			(166,517)	(21,831)
Recoveries			1,357	83,968
Provision			185,598	(5,404)
Ending balance	822,437	922,587	822,437	922,587
Ending balance: individually evaluated for impairment	201,637	339,087	201,637	339,087
Ending balance: collectively evaluated for impairment	620,800	583,500	620,800	583,500
Ending balance: loans acquired with deteriorated credit quality
Loans Receivable:
Ending balance	61,366,016	48,853,854	61,366,016	48,853,854	48,993,867
Ending balance: individually evaluated for impairment	3,128,863	3,235,812	3,128,863	3,235,812
Ending balance: collectively evaluated for impairment	58,237,153	45,618,042	58,237,153	45,618,042
Ending balance: loans acquired with deteriorated credit quality
Loans-Commercial and Industrial [Member]
Allowance for credit losses:
Beginning balance			1,604,510	1,808,260
Charge-offs			(51,028)	(710,645)
Recoveries			34,719	132,949
Provision			(86,871)	513,462
Ending balance	1,501,330	1,744,026	1,501,330	1,744,026
Ending balance: individually evaluated for impairment	167,530	185,726	167,530	185,726
Ending balance: collectively evaluated for impairment	1,333,800	1,558,300	1,333,800	1,558,300
Ending balance: loans acquired with deteriorated credit quality
Loans Receivable:
Ending balance	67,225,422	84,317,344	67,225,422	84,317,344	75,914,072
Ending balance: individually evaluated for impairment	2,285,488	2,457,177	2,285,488	2,457,177
Ending balance: collectively evaluated for impairment	64,939,934	81,860,167	64,939,934	81,860,167
Ending balance: loans acquired with deteriorated credit quality
Consumer [Member]
Allowance for credit losses:
Beginning balance			198,789	210,807
Charge-offs			(67,988)	(151,102)
Recoveries			24,138	16,393
Provision			15,702	133,797
Ending balance	170,641	209,895	170,641	209,895
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	170,641	209,895	170,641	209,895
Ending balance: loans acquired with deteriorated credit quality
Loans Receivable:
Ending balance	6,071,806	7,090,254	6,071,806	7,090,254	6,703,363
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	6,071,806	7,090,254	6,071,806	7,090,254
Ending balance: loans acquired with deteriorated credit quality
Other [Member]
Allowance for credit losses:
Beginning balance			42,800	55,600
Charge-offs
Recoveries
Provision			(200)	(12,300)
Ending balance	42,600	43,300	42,600	43,300
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	42,600	43,300	42,600	43,300
Ending balance: loans acquired with deteriorated credit quality
Loans Receivable:
Ending balance	3,900,689	4,183,808	3,900,689	4,183,808	4,111,464
Ending balance: individually evaluated for impairment		207,179		207,179
Ending balance: collectively evaluated for impairment	3,900,689	3,976,629	3,900,689	3,976,629
Ending balance: loans acquired with deteriorated credit quality