Fair Values (Summary Of Assets And Liabilities Measured At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Quoted Market Price In Active Markets (Level 1) [Member]
Fair Values [Line Items]
Total
Significant Other Observable Inputs (Level 2) [Member]
Fair Values [Line Items]
Total	54,129	49,615
Significant Unobservable Inputs (Level 3) [Member]
Fair Values [Line Items]
Total	63,938	73,199
Commercial [Member] | Quoted Market Price In Active Markets (Level 1) [Member]
Fair Values [Line Items]
Total
Commercial [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Values [Line Items]
Total	1,711	2,501
Agriculture [Member] | Quoted Market Price In Active Markets (Level 1) [Member]
Fair Values [Line Items]
Total
Agriculture [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Values [Line Items]
Total	149	154
Consumer Installment Loans [Member] | Quoted Market Price In Active Markets (Level 1) [Member]
Fair Values [Line Items]
Total
Consumer Installment Loans [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Values [Line Items]
Total	114	109
All Other Loans [Member] | Quoted Market Price In Active Markets (Level 1) [Member]
Fair Values [Line Items]
Total
Real Estate [Member] | Commercial [Member] | Quoted Market Price In Active Markets (Level 1) [Member]
Fair Values [Line Items]
Total
Real Estate [Member] | Commercial [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Values [Line Items]
Total	27,704	30,688
Real Estate [Member] | Construction And Land Development [Member] | Quoted Market Price In Active Markets (Level 1) [Member]
Fair Values [Line Items]
Total
Real Estate [Member] | Construction And Land Development [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Values [Line Items]
Total	3,172	4,375
Real Estate [Member] | Residential 1-4 Family [Member] | Quoted Market Price In Active Markets (Level 1) [Member]
Fair Values [Line Items]
Total
Real Estate [Member] | Residential 1-4 Family [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Values [Line Items]
Total	7,832	9,561
Real Estate [Member] | Multifamily [Member] | Quoted Market Price In Active Markets (Level 1) [Member]
Fair Values [Line Items]
Total
Real Estate [Member] | Multifamily [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Values [Line Items]
Total	1,305	2,500
Real Estate [Member] | Farmland [Member] | Quoted Market Price In Active Markets (Level 1) [Member]
Fair Values [Line Items]
Total
Real Estate [Member] | Farmland [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Values [Line Items]
Total	8,170	9,442
Recurring Basis [Member] | U.S. Government Agencies [Member] | Quoted Market Price In Active Markets (Level 1) [Member]
Fair Values [Line Items]
Total
Recurring Basis [Member] | U.S. Government Agencies [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Values [Line Items]
Total	22,953	23,637
Recurring Basis [Member] | Mortgage Backed Securities [Member] | Quoted Market Price In Active Markets (Level 1) [Member]
Fair Values [Line Items]
Total
Recurring Basis [Member] | Mortgage Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Values [Line Items]
Total	31,176	25,978
Non-Recurring Basis [Member] | Other Real Estate Owned [Member] | Quoted Market Price In Active Markets (Level 1) [Member]
Fair Values [Line Items]
Total
Non-Recurring Basis [Member] | Other Real Estate Owned [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Values [Line Items]
Total	$ 13,781	$ 13,869