Loans (Summary Of Loans Receivable On Nonaccrual Status) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Loans [Line Items]
Total loans receivable on nonaccrual status	$ 30,764		$ 33,536
Interest income not recognized on nonaccrual loans, Total	94	439
Commercial [Member]
Loans [Line Items]
Total loans receivable on nonaccrual status	1,964		2,762
Agriculture [Member]
Loans [Line Items]
Total loans receivable on nonaccrual status	149		450
Consumer Installment Loans [Member]
Loans [Line Items]
Total loans receivable on nonaccrual status	59		9
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	28,592		30,315
Real Estate [Member] | Commercial [Member]
Loans [Line Items]
Total loans receivable on nonaccrual status	14,496		16,308
Real Estate [Member] | Construction And Land Development [Member]
Loans [Line Items]
Total loans receivable on nonaccrual status	2,707		2,412
Real Estate [Member] | Residential 1-4 Family [Member]
Loans [Line Items]
Total loans receivable on nonaccrual status	4,588		3,403
Real Estate [Member] | Multifamily [Member]
Loans [Line Items]
Total loans receivable on nonaccrual status	442		442
Real Estate [Member] | Farmland [Member]
Loans [Line Items]
Total loans receivable on nonaccrual status	$ 6,359		$ 7,750