Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	$ 15,650	$ 28,280
Charge-Offs	(7,369)	(19,210)
Recoveries	481	1,840
Provision	5,627	6,000
Ending Balance	14,389	16,910
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	5,428	9,442
Total End of Period Allowance Balance, Collectively Evaluated for Impairment	8,961	7,468
Total End of Period Allowance Balance	14,389	16,910
Total End of Period Loan Balance, Individually Evaluated for Impairment	78,087	89,614
Total End of Period Loan Balance, Collectively Evaluated for Impairment	648,435	651,385
Total End of Period Loan Balance	726,522	740,999
Reduction in allowance for loan losses	3,422
Loan balance for reviewing, minimum	50,000
NonaccrualTdr [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	4,214	7,099
Total End of Period Loan Balance, Individually Evaluated for Impairment	64,648	74,908
Substandard [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Impaired loans below the $50,000 review threshold	944	881
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	1,214	2,343
Total End of Period Loan Balance, Individually Evaluated for Impairment	13,439	14,706
Commercial and Agricultural [Member] | Commercial [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	1,071	4,415
Charge-Offs	(407)	(718)
Recoveries	105	124
Provision	153	(1,591)
Ending Balance	922	2,230
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	728	686
Total End of Period Allowance Balance, Collectively Evaluated for Impairment	194	1,544
Total End of Period Allowance Balance	922	2,230
Total End of Period Loan Balance, Individually Evaluated for Impairment	4,091	4,490
Total End of Period Loan Balance, Collectively Evaluated for Impairment	50,190	47,162
Total End of Period Loan Balance	54,281	51,652
Commercial and Agricultural [Member] | Commercial [Member] | NonaccrualTdr [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	514	39
Total End of Period Loan Balance, Individually Evaluated for Impairment	1,701	1,609
Commercial and Agricultural [Member] | Commercial [Member] | Substandard [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	214	647
Total End of Period Loan Balance, Individually Evaluated for Impairment	2,390	2,881
Commercial and Agricultural [Member] | Agricultural [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	297	698
Charge-Offs	(3)	(455)
Recoveries	0	401
Provision	0	(257)
Ending Balance	294	387
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	0	7
Total End of Period Allowance Balance, Collectively Evaluated for Impairment	294	380
Total End of Period Allowance Balance	294	387
Total End of Period Loan Balance, Individually Evaluated for Impairment	0	373
Total End of Period Loan Balance, Collectively Evaluated for Impairment	12,594	13,399
Total End of Period Loan Balance	12,594	13,772
Commercial and Agricultural [Member] | Agricultural [Member] | NonaccrualTdr [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	0	7
Total End of Period Loan Balance, Individually Evaluated for Impairment	0	152
Commercial and Agricultural [Member] | Agricultural [Member] | Substandard [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	0	0
Total End of Period Loan Balance, Individually Evaluated for Impairment	0	221
Real Estate [Member] | Commercial [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	6,448	8,030
Charge-Offs	(4,273)	(12,175)
Recoveries	217	517
Provision	4,165	6,730
Ending Balance	6,557	3,102
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	1,240	1,097
Total End of Period Allowance Balance, Collectively Evaluated for Impairment	5,317	2,005
Total End of Period Allowance Balance	6,557	3,102
Total End of Period Loan Balance, Individually Evaluated for Impairment	40,234	39,421
Total End of Period Loan Balance, Collectively Evaluated for Impairment	271,159	280,701
Total End of Period Loan Balance	311,393	320,122
Real Estate [Member] | Commercial [Member] | NonaccrualTdr [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	864	689
Total End of Period Loan Balance, Individually Evaluated for Impairment	34,165	34,888
Real Estate [Member] | Commercial [Member] | Substandard [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	376	408
Total End of Period Loan Balance, Individually Evaluated for Impairment	6,069	4,533
Real Estate [Member] | Commercial Construction [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	3,123	4,126
Charge-Offs	(1,929)	(4,218)
Recoveries	74	548
Provision	836	4,217
Ending Balance	2,104	4,673
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	1,844	4,579
Total End of Period Allowance Balance, Collectively Evaluated for Impairment	260	94
Total End of Period Allowance Balance	2,104	4,673
Total End of Period Loan Balance, Individually Evaluated for Impairment	20,536	30,714
Total End of Period Loan Balance, Collectively Evaluated for Impairment	33,516	32,390
Total End of Period Loan Balance	54,052	63,104
Real Estate [Member] | Commercial Construction [Member] | NonaccrualTdr [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	1,786	4,323
Total End of Period Loan Balance, Individually Evaluated for Impairment	18,743	29,064
Real Estate [Member] | Commercial Construction [Member] | Substandard [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	58	256
Total End of Period Loan Balance, Individually Evaluated for Impairment	1,793	1,650
Real Estate [Member] | Residential Construction [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	138	520
Charge-Offs	0	0
Recoveries	0	0
Provision	0	(159)
Ending Balance	138	361
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	0	0
Total End of Period Allowance Balance, Collectively Evaluated for Impairment	138	361
Total End of Period Allowance Balance	138	361
Total End of Period Loan Balance, Individually Evaluated for Impairment	0	0
Total End of Period Loan Balance, Collectively Evaluated for Impairment	6,038	2,628
Total End of Period Loan Balance	6,038	2,628
Real Estate [Member] | Residential Construction [Member] | NonaccrualTdr [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	0	0
Total End of Period Loan Balance, Individually Evaluated for Impairment	0	0
Real Estate [Member] | Residential Construction [Member] | Substandard [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	0	0
Total End of Period Loan Balance, Individually Evaluated for Impairment	0	0
Real Estate [Member] | Residential [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	3,695	5,942
Charge-Offs	(632)	(1,291)
Recoveries	9	120
Provision	413	(910)
Ending Balance	3,485	3,861
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	1,616	2,994
Total End of Period Allowance Balance, Collectively Evaluated for Impairment	1,869	867
Total End of Period Allowance Balance	3,485	3,861
Total End of Period Loan Balance, Individually Evaluated for Impairment	10,651	13,662
Total End of Period Loan Balance, Collectively Evaluated for Impairment	186,608	181,771
Total End of Period Loan Balance	197,259	195,433
Real Estate [Member] | Residential [Member] | NonaccrualTdr [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	1,050	2,036
Total End of Period Loan Balance, Individually Evaluated for Impairment	7,751	8,692
Real Estate [Member] | Residential [Member] | Substandard [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	566	958
Total End of Period Loan Balance, Individually Evaluated for Impairment	2,900	4,970
Real Estate [Member] | Farmland [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	365	944
Charge-Offs	(39)	(61)
Recoveries	5	1
Provision	0	(317)
Ending Balance	331	567
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	0	11
Total End of Period Allowance Balance, Collectively Evaluated for Impairment	331	556
Total End of Period Allowance Balance	331	567
Total End of Period Loan Balance, Individually Evaluated for Impairment	2,540	867
Total End of Period Loan Balance, Collectively Evaluated for Impairment	46,938	46,819
Total End of Period Loan Balance	49,478	47,686
Real Estate [Member] | Farmland [Member] | NonaccrualTdr [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	0	0
Total End of Period Loan Balance, Individually Evaluated for Impairment	2,277	487
Real Estate [Member] | Farmland [Member] | Substandard [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	0	11
Total End of Period Loan Balance, Individually Evaluated for Impairment	263	380
Consumer and Other [Member] | Consumer [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	205	3,074
Charge-Offs	(75)	(192)
Recoveries	63	123
Provision	60	(1,371)
Ending Balance	253	1,634
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	0	68
Total End of Period Allowance Balance, Collectively Evaluated for Impairment	253	1,566
Total End of Period Allowance Balance	253	1,634
Total End of Period Loan Balance, Individually Evaluated for Impairment	17	56
Total End of Period Loan Balance, Collectively Evaluated for Impairment	29,568	30,882
Total End of Period Loan Balance	29,585	30,938
Consumer and Other [Member] | Consumer [Member] | NonaccrualTdr [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	0	5
Total End of Period Loan Balance, Individually Evaluated for Impairment	11	16
Consumer and Other [Member] | Consumer [Member] | Substandard [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	0	63
Total End of Period Loan Balance, Individually Evaluated for Impairment	6	40
Consumer and Other [Member] | Other [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	308	531
Charge-Offs	(11)	(100)
Recoveries	8	6
Provision	0	(342)
Ending Balance	305	95
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	0	0
Total End of Period Allowance Balance, Collectively Evaluated for Impairment	305	95
Total End of Period Allowance Balance	305	95
Total End of Period Loan Balance, Individually Evaluated for Impairment	18	31
Total End of Period Loan Balance, Collectively Evaluated for Impairment	11,824	15,633
Total End of Period Loan Balance	11,842	15,664
Consumer and Other [Member] | Other [Member] | NonaccrualTdr [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	0	0
Total End of Period Loan Balance, Individually Evaluated for Impairment	0	0
Consumer and Other [Member] | Other [Member] | Substandard [Member]
Breakdowns of allowance for loan losses, segregated by impairment methodology [Abstract]
Total End of Period Allowance Balance, Individually Evaluated for Impairment	0	0
Total End of Period Loan Balance, Individually Evaluated for Impairment	$ 18	$ 31