Loans (Summary Of Loans Receivable On Nonaccrual Status) (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Loans [Line Items]
Total loans receivable on nonaccrual status	$ 40,157,000		$ 42,316,000
Interest income not recognized on nonaccrual loans, Total	1,100,000	1,300,000
Commercial [Member]
Loans [Line Items]
Total loans receivable on nonaccrual status	2,556,000		4,522,000
Agriculture [Member]
Loans [Line Items]
Total loans receivable on nonaccrual status	494,000		854,000
Consumer Installment Loans [Member]
Loans [Line Items]
Total loans receivable on nonaccrual status	127,000		1,000
All Other Loans [Member]
Loans [Line Items]
Total loans receivable on nonaccrual status
Real Estate [Member]
Loans [Line Items]
Total loans receivable on nonaccrual status	36,980,000		36,939,000
Real Estate [Member] | Commercial [Member]
Loans [Line Items]
Total loans receivable on nonaccrual status	19,735,000		19,169,000
Real Estate [Member] | Construction And Land Development [Member]
Loans [Line Items]
Total loans receivable on nonaccrual status	2,997,000		5,583,000
Real Estate [Member] | Residential 1-4 Family [Member]
Loans [Line Items]
Total loans receivable on nonaccrual status	4,974,000		4,829,000
Real Estate [Member] | Multifamily [Member]
Loans [Line Items]
Total loans receivable on nonaccrual status	2,076,000		2,101,000
Real Estate [Member] | Farmland [Member]
Loans [Line Items]
Total loans receivable on nonaccrual status	$ 7,198,000		$ 5,257,000