Troubled Debt Restructurings (Schedule Of Loans Modified As Troubled Debt Restructurings) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012 loan	Sep. 30, 2011 loan	Sep. 30, 2012 loan	Sep. 30, 2011 loan
Financing Receivable, Modifications [Line Items]
# of Loans		19	45	34
Pre-Mod. Recorded Investment		$ 5,495,000	$ 3,068,000	$ 9,628,000
Post-Mod. Recorded Investment		5,461,000	2,774,000	9,562,000
Commercial [Member]
Financing Receivable, Modifications [Line Items]
# of Loans		5		6
Pre-Mod. Recorded Investment		1,074,000		1,111,000
Post-Mod. Recorded Investment		1,063,000		1,096,000
Agriculture [Member]
Financing Receivable, Modifications [Line Items]
# of Loans		1		2
Pre-Mod. Recorded Investment		90,000		390,000
Post-Mod. Recorded Investment		90,000		390,000
Consumer Installment Loans [Member]
Financing Receivable, Modifications [Line Items]
# of Loans		4	3	8
Pre-Mod. Recorded Investment		92,000	25,000	159,000
Post-Mod. Recorded Investment		91,000	19,000	152,000
All Other Loans [Member]
Financing Receivable, Modifications [Line Items]
# of Loans
Pre-Mod. Recorded Investment
Post-Mod. Recorded Investment
Real Estate [Member]
Financing Receivable, Modifications [Line Items]
# of Loans		9	42	18
Pre-Mod. Recorded Investment		4,239,000	3,043,000	7,968,000
Post-Mod. Recorded Investment		4,217,000	2,755,000	7,924,000
Real Estate [Member] | Commercial [Member]
Financing Receivable, Modifications [Line Items]
# of Loans		4	7	8
Pre-Mod. Recorded Investment		3,585,000	991,000	6,956,000
Post-Mod. Recorded Investment		3,577,000	791,000	6,928,000
Real Estate [Member] | Construction And Land Development [Member]
Financing Receivable, Modifications [Line Items]
# of Loans				1
Pre-Mod. Recorded Investment				29,000
Post-Mod. Recorded Investment				28,000
Real Estate [Member] | Residential 1-4 Family [Member]
Financing Receivable, Modifications [Line Items]
# of Loans		4	35	8
Pre-Mod. Recorded Investment		312,000	2,052,000	641,000
Post-Mod. Recorded Investment		298,000	1,964,000	626,000
Real Estate [Member] | Multifamily [Member]
Financing Receivable, Modifications [Line Items]
# of Loans		1		1
Pre-Mod. Recorded Investment		342,000		342,000
Post-Mod. Recorded Investment		342,000		342,000
Real Estate [Member] | Farmland [Member]
Financing Receivable, Modifications [Line Items]
# of Loans
Pre-Mod. Recorded Investment
Post-Mod. Recorded Investment