Fair Values (Summary Of Assets And Liabilities Measured At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
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	48,559	32,434
Significant Unobservable Inputs (Level 3) [Member]
Fair Values [Line Items]
Total	79,281	100,867
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	3,222	4,737
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	467	714
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	134	28
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	33,618	43,321
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	5,246	8,769
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	11,469	13,642
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	2,889	613
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	10,868	13,951
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	25,839	21,633
Recurring Basis [Member] | Taxable Municipals [Member] | Quoted Market Price In Active Markets (Level 1) [Member]
Fair Values [Line Items]
Total
Recurring Basis [Member] | Taxable Municipals [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Values [Line Items]
Total	850	1,552
Recurring Basis [Member] | Tax-Exempt Municipals [Member] | Quoted Market Price In Active Markets (Level 1) [Member]
Fair Values [Line Items]
Total
Recurring Basis [Member] | Tax-Exempt Municipals [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Values [Line Items]
Total		1,054
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	21,870	8,195
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	$ 11,368	$ 15,092