Allowance For Loan Losses (Summary Of Activity In The Allowance For Loan Losses By Portfolio Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Allowance For Loan Losses [Line Items]
Balance, beginning of year	$ 16,810	$ 18,380
Charge Offs	(2,676)	(6,751)
Recoveries	260	381
Advances
Provision	550	4,800
Balance, End of period	14,944	16,810
Commercial [Member]
Allowance For Loan Losses [Line Items]
Balance, beginning of year	1,772	1,883
Charge Offs	(302)	(942)
Recoveries	5	86
Advances
Provision	(86)	745
Balance, End of period	1,389	1,772
Agriculture [Member]
Allowance For Loan Losses [Line Items]
Balance, beginning of year	533	486
Charge Offs	(303)	(4)
Recoveries	1	11
Advances
Provision	151	40
Balance, End of period	382	533
Consumer Installment Loans [Member]
Allowance For Loan Losses [Line Items]
Balance, beginning of year	388	781
Charge Offs	(66)	(336)
Recoveries	16	63
Advances
Provision	8	(120)
Balance, End of period	346	388
All Other Loans [Member]
Allowance For Loan Losses [Line Items]
Balance, beginning of year	4	2
Advances
Provision	(1)	2
Balance, End of period	3	4
Unallocated [Member]
Allowance For Loan Losses [Line Items]
Balance, beginning of year	551	851
Advances
Provision	1	(300)
Balance, End of period	552	551
Real Estate [Member]
Allowance For Loan Losses [Line Items]
Balance, beginning of year	13,562	14,377
Charge Offs	(2,005)	(5,469)
Recoveries	238	221
Advances
Provision	477	4,433
Balance, End of period	12,272	13,562
Real Estate [Member] | Commercial [Member]
Allowance For Loan Losses [Line Items]
Balance, beginning of year	6,720	5,671
Charge Offs	(1,073)	(2,845)
Recoveries	207	61
Advances
Provision	485	3,833
Balance, End of period	6,339	6,720
Real Estate [Member] | Construction And Land Development [Member]
Allowance For Loan Losses [Line Items]
Balance, beginning of year	2,166	3,848
Charge Offs	(190)	(357)
Recoveries	1	73
Advances
Provision	247	(1,398)
Balance, End of period	2,224	2,166
Real Estate [Member] | Residential 1-4 Family [Member]
Allowance For Loan Losses [Line Items]
Balance, beginning of year	3,050	3,759
Charge Offs	(374)	(1,615)
Recoveries	30	87
Advances
Provision	8	819
Balance, End of period	2,714	3,050
Real Estate [Member] | Multifamily [Member]
Allowance For Loan Losses [Line Items]
Balance, beginning of year	552	148
Charge Offs		(75)
Advances
Provision	(408)	479
Balance, End of period	144	552
Real Estate [Member] | Farmland [Member]
Allowance For Loan Losses [Line Items]
Balance, beginning of year	1,074	951
Charge Offs	(368)	(577)
Advances
Provision	145	700
Balance, End of period	$ 851	$ 1,074