Credit Quality of Loans and Allowance for Loan Losses (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
With no related allowance recorded:
With no related allowance, Recorded Investment	$ 20,187	$ 14,531	$ 20,187	$ 14,531	$ 16,978
With no related allowance, Unpaid Principal Balance	22,956	18,825	22,956	18,825	22,842
With no related allowance, Related Allowance
With no related allowance, Average Recorded Investment	17,462	13,441	16,560	13,548
With no related allowance, Interest Income Recognized	87	74	194	151
With an allowance recorded:
With an allowance recorded, Recorded Investment	12,128	16,822	12,128	16,822	14,359
With an allowance recorded, Unpaid Principal Balance	12,525	18,473	12,525	18,473	14,319
With an allowance recorded, Related Allowance	1,392	4,059	1,392	4,059	2,463
With an allowance recorded, Average Recorded Investment	14,714	17,342	16,353	15,967
With an allowance recorded, Interest Income	78	97	200	190
Total impaired loans	32,315	31,353	32,315	31,353	31,337
Unpaid Principal Balance, Total	35,481	37,298	35,481	37,298	37,161
Related Allowance, Total	1,392	4,059	1,392	4,059	2,463
Average Recorded Investment, Total	32,176	30,783	32,913	29,515
Interest Income Recognized, Total	165	171	394	341
Construction and Land Development [Member]
With an allowance recorded:
With an allowance recorded, Related Allowance	575	1,931	575	1,931	637
Total impaired loans	8,805	16,262	8,805	16,262	10,086
Unpaid Principal Balance, Total	10,691	21,606	10,691	21,606	14,931
Related Allowance, Total	575	1,931	575	1,931	637
Average Recorded Investment, Total	8,290	15,896	9,112	16,025
Interest Income Recognized, Total	33	73	77	168
Residential [Member]
With an allowance recorded:
With an allowance recorded, Related Allowance	617	1,124	617	1,124	480
Total impaired loans	7,624	8,902	7,624	8,902	5,526
Unpaid Principal Balance, Total	7,760	9,123	7,760	9,123	5,993
Related Allowance, Total	617	1,124	617	1,124	480
Average Recorded Investment, Total	7,515	8,759	7,116	7,758
Interest Income Recognized, Total	52	50	108	77
Commercial [Member]
With an allowance recorded:
With an allowance recorded, Related Allowance	200	834	200	834	1,346
Total impaired loans	15,886	5,988	15,886	5,988	15,725
Unpaid Principal Balance, Total	17,030	6,369	17,030	6,369	16,237
Related Allowance, Total	200	834	200	834	1,346
Average Recorded Investment, Total	16,371	5,928	16,685	5,532
Interest Income Recognized, Total	80	45	209	90
Consumer [Member]
With an allowance recorded:
With an allowance recorded, Related Allowance		170		170
Total impaired loans		201		201
Unpaid Principal Balance, Total		200		200
Related Allowance, Total		170		170
Average Recorded Investment, Total		200		200
Interest Income Recognized, Total		3		60
Real Estate Construction and Land Development Loans [Member]
With no related allowance recorded:
With no related allowance, Recorded Investment	5,750	7,995	5,750	7,995	6,280
With no related allowance, Unpaid Principal Balance	7,219	11,610	7,219	11,610	11,137
With no related allowance, Related Allowance
With no related allowance, Average Recorded Investment	5,552	7,105	5,791	7,819
With no related allowance, Interest Income Recognized	22	33	49	82
With an allowance recorded:
With an allowance recorded, Recorded Investment	3,055	8,267	3,055	8,267	3,806
With an allowance recorded, Unpaid Principal Balance	3,472	9,996	3,472	9,996	3,794
With an allowance recorded, Related Allowance	575	1,931	575	1,931	637
With an allowance recorded, Average Recorded Investment	2,738	8,791	3,321	8,206
With an allowance recorded, Interest Income	11	40	28	86
Related Allowance, Total	575	1,931	575	1,931	637
Real Estate Secured by Farmland [Member]
With no related allowance recorded:
With no related allowance, Recorded Investment	356		356
With no related allowance, Unpaid Principal Balance	356		356
With no related allowance, Related Allowance
With no related allowance, Average Recorded Investment	237		119
With no related allowance, Interest Income Recognized	2		3
With an allowance recorded:
With an allowance recorded, Recorded Investment
With an allowance recorded, Unpaid Principal Balance
With an allowance recorded, Related Allowance
With an allowance recorded, Average Recorded Investment
With an allowance recorded, Interest Income
Related Allowance, Total
Real Estate Secured by Residential Properties [Member]
With no related allowance recorded:
With no related allowance, Recorded Investment	2,180	3,860	2,180	3,860	2,135
With no related allowance, Unpaid Principal Balance	2,329	4,222	2,329	4,222	2,611
With no related allowance, Related Allowance
With no related allowance, Average Recorded Investment	2,074	3,855	1,830	3,846
With no related allowance, Interest Income Recognized	14	22	28	38
With an allowance recorded:
With an allowance recorded, Recorded Investment	5,444	5,042	5,444	5,042	3,391
With an allowance recorded, Unpaid Principal Balance	5,431	4,901	5,431	4,901	3,382
With an allowance recorded, Related Allowance	617	1,124	617	1,124	480
With an allowance recorded, Average Recorded Investment	5,441	4,904	5,286	3,912
With an allowance recorded, Interest Income	38	28	80	39
Related Allowance, Total	617	1,124	617	1,124	480
Real Estate Secured by Nonfarm Nonresidential [Member]
With no related allowance recorded:
With no related allowance, Recorded Investment	11,682	2,501	11,682	2,501	7,075
With no related allowance, Unpaid Principal Balance	12,835	2,544	12,835	2,544	7,484
With no related allowance, Related Allowance
With no related allowance, Average Recorded Investment	9,303	2,183	8,227	1,517
With no related allowance, Interest Income Recognized	40	17	93	24
With an allowance recorded:
With an allowance recorded, Recorded Investment	3,430	3,011	3,430	3,011	6,976
With an allowance recorded, Unpaid Principal Balance	3,423	3,076	3,423	3,076	6,957
With an allowance recorded, Related Allowance	180	585	180	585	1,181
With an allowance recorded, Average Recorded Investment	6,468	3,089	7,622	3,245
With an allowance recorded, Interest Income	27	24	87	51
Related Allowance, Total	180	585	180	585	1,181
Consumer Installment [Member]
With no related allowance recorded:
With no related allowance, Recorded Investment
With no related allowance, Unpaid Principal Balance
With no related allowance, Related Allowance
With no related allowance, Average Recorded Investment
With no related allowance, Interest Income Recognized
With an allowance recorded:
With an allowance recorded, Recorded Investment
With an allowance recorded, Unpaid Principal Balance
With an allowance recorded, Related Allowance
With an allowance recorded, Average Recorded Investment
With an allowance recorded, Interest Income
Related Allowance, Total
Credit Cards and Related Plans [Member]
With no related allowance recorded:
With no related allowance, Recorded Investment
With no related allowance, Unpaid Principal Balance
With no related allowance, Related Allowance
With no related allowance, Average Recorded Investment
With no related allowance, Interest Income Recognized
With an allowance recorded:
With an allowance recorded, Recorded Investment		201		201
With an allowance recorded, Unpaid Principal Balance		200		200
With an allowance recorded, Related Allowance		170		170
With an allowance recorded, Average Recorded Investment		200		200
With an allowance recorded, Interest Income		3		6
Related Allowance, Total		170		170
Commercial and Industrial [Member]
With no related allowance recorded:
With no related allowance, Recorded Investment	219	175	219	175	379
With no related allowance, Unpaid Principal Balance	217	449	217	449	500
With no related allowance, Related Allowance
With no related allowance, Average Recorded Investment	296	298	300	366
With no related allowance, Interest Income Recognized	9	2	12	7
With an allowance recorded:
With an allowance recorded, Recorded Investment	199	301	199	301	186
With an allowance recorded, Unpaid Principal Balance	199	300	199	300	186
With an allowance recorded, Related Allowance	20	249	20	249	165
With an allowance recorded, Average Recorded Investment	67	358	124	404
With an allowance recorded, Interest Income	2	2	5	8
Related Allowance, Total	20	249	20	249	165
Loans to Finance Agricultural Production [Member]
With no related allowance recorded:
With no related allowance, Recorded Investment					1,109
With no related allowance, Unpaid Principal Balance					1,110
With no related allowance, Related Allowance
With no related allowance, Average Recorded Investment			293
With no related allowance, Interest Income Recognized			9
With an allowance recorded:
With an allowance recorded, Recorded Investment
With an allowance recorded, Unpaid Principal Balance
With an allowance recorded, Related Allowance
With an allowance recorded, Average Recorded Investment
With an allowance recorded, Interest Income
Related Allowance, Total
All Other Loans [Member]
With no related allowance recorded:
With no related allowance, Recorded Investment
With no related allowance, Unpaid Principal Balance
With no related allowance, Related Allowance
With no related allowance, Average Recorded Investment
With no related allowance, Interest Income Recognized
With an allowance recorded:
With an allowance recorded, Recorded Investment
With an allowance recorded, Unpaid Principal Balance
With an allowance recorded, Related Allowance
With an allowance recorded, Average Recorded Investment
With an allowance recorded, Interest Income
Related Allowance, Total