Loans (Summary Of Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Loans [Line Items]
Average Recorded Investment	$ 85,857	$ 93,096
Interest Income Recognized	1,372	3,604
Recorded Investment	74,505	91,821
Unpaid Principal Balance	88,489	101,152
Related Allowance	6,592	6,046
With No Related Allowance Recorded [Member] | Commercial [Member]
Loans [Line Items]
Average Recorded Investment	2,846	2,958
Interest Income Recognized	35	60
Recorded Investment	2,034	3,529
Unpaid Principal Balance	2,389	4,070
With No Related Allowance Recorded [Member] | Agriculture [Member]
Loans [Line Items]
Average Recorded Investment	551	396
Interest Income Recognized	8	1
Recorded Investment	467	521
Unpaid Principal Balance	467	817
With No Related Allowance Recorded [Member] | Consumer Installment Loans [Member]
Loans [Line Items]
Average Recorded Investment	79	4
Interest Income Recognized	9	1
Recorded Investment	112	9
Unpaid Principal Balance	112	9
With No Related Allowance Recorded [Member] | All Other Loans [Member]
Loans [Line Items]
Average Recorded Investment
Interest Income Recognized
Recorded Investment
Unpaid Principal Balance
Related Allowance
With No Related Allowance Recorded [Member] | Real Estate [Member] | Commercial [Member]
Loans [Line Items]
Average Recorded Investment	28,230	32,370
Interest Income Recognized	628	1,356
Recorded Investment	21,704	31,633
Unpaid Principal Balance	24,215	33,175
With No Related Allowance Recorded [Member] | Real Estate [Member] | Construction And Land Development [Member]
Loans [Line Items]
Average Recorded Investment	5,009	14,288
Interest Income Recognized	84	125
Recorded Investment	4,017	6,954
Unpaid Principal Balance	8,934	12,838
With No Related Allowance Recorded [Member] | Real Estate [Member] | Residential 1-4 Family [Member]
Loans [Line Items]
Average Recorded Investment	8,203	6,406
Interest Income Recognized	243	315
Recorded Investment	7,548	8,221
Unpaid Principal Balance	7,810	8,296
With No Related Allowance Recorded [Member] | Real Estate [Member] | Multifamily [Member]
Loans [Line Items]
Average Recorded Investment	1,045	619
Interest Income Recognized	48	31
Recorded Investment	1,196	613
Unpaid Principal Balance	1,196	613
With No Related Allowance Recorded [Member] | Real Estate [Member] | Farmland [Member]
Loans [Line Items]
Average Recorded Investment	8,592	13,005
Interest Income Recognized	(44)	435
Recorded Investment	9,068	10,364
Unpaid Principal Balance	9,407	10,554
With An Allowance Recorded [Member] | Commercial [Member]
Loans [Line Items]
Average Recorded Investment	1,641	1,982
Interest Income Recognized	17	75
Recorded Investment	1,395	1,857
Unpaid Principal Balance	1,663	1,857
Related Allowance	207	649
With An Allowance Recorded [Member] | Agriculture [Member]
Loans [Line Items]
Average Recorded Investment	378	758
Interest Income Recognized		28
Recorded Investment		641
Unpaid Principal Balance		641
Related Allowance		448
With An Allowance Recorded [Member] | Consumer Installment Loans [Member]
Loans [Line Items]
Average Recorded Investment	79	41
Interest Income Recognized	3	3
Recorded Investment	37	43
Unpaid Principal Balance	37	43
Related Allowance	15	24
With An Allowance Recorded [Member] | All Other Loans [Member]
Loans [Line Items]
Average Recorded Investment
Interest Income Recognized
Recorded Investment
Unpaid Principal Balance
Related Allowance
With An Allowance Recorded [Member] | Real Estate [Member] | Commercial [Member]
Loans [Line Items]
Average Recorded Investment	15,089	9,887
Interest Income Recognized	241	691
Recorded Investment	16,139	14,482
Unpaid Principal Balance	16,510	14,973
Related Allowance	4,225	2,794
With An Allowance Recorded [Member] | Real Estate [Member] | Construction And Land Development [Member]
Loans [Line Items]
Average Recorded Investment	1,962	2,917
Interest Income Recognized	(157)	87
Recorded Investment	1,575	2,289
Unpaid Principal Balance	5,636	2,310
Related Allowance	346	474
With An Allowance Recorded [Member] | Real Estate [Member] | Residential 1-4 Family [Member]
Loans [Line Items]
Average Recorded Investment	5,884	5,111
Interest Income Recognized	165	277
Recorded Investment	4,714	6,473
Unpaid Principal Balance	5,257	6,764
Related Allowance	793	1,052
With An Allowance Recorded [Member] | Real Estate [Member] | Multifamily [Member]
Loans [Line Items]
Average Recorded Investment	1,479
Interest Income Recognized	26
Recorded Investment	2,314
Unpaid Principal Balance	2,550
Related Allowance	621
With An Allowance Recorded [Member] | Real Estate [Member] | Farmland [Member]
Loans [Line Items]
Average Recorded Investment	4,790	2,354
Interest Income Recognized	66	119
Recorded Investment	2,185	4,192
Unpaid Principal Balance	2,306	4,192
Related Allowance	$ 385	$ 605