Allowance For Loan Losses (Summary Of Analysis Of Allowance For Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2009
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 17,933	$ 17,712	$ 17,712	$ 17,933	$ 17,712
Total, Losses	2,497	1,339	8,817
Total Recoveries	84	149	538
Net losses	2,413	1,190	8,279
Provision for loan losses	1,500	2,001	8,500
Ending balance	17,020	18,523	17,933	17,933	17,712
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	782
Total, Losses	17	31	1,273
Total Recoveries	2	2	13
Provision for loan losses	256
Ending balance	1,023		782
Owner-Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,387
Total, Losses	63	283	636
Total Recoveries	2	3	33
Provision for loan losses	53
Ending balance	1,379		1,387
Non-Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	3,269
Total, Losses	3	395	806
Total Recoveries		8	31
Provision for loan losses	(18)
Ending balance	3,248		3,269
Land And Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	5,220
Total, Losses	2,062	365	3,390
Total Recoveries	5	5	61
Provision for loan losses	742
Ending balance	3,905		5,220
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	138
Total, Losses			367
Total Recoveries
Provision for loan losses	140
Ending balance	278		138
Non-Jumbo [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	2,617
Total, Losses	228	126	1,372
Total Recoveries	19	19	81
Provision for loan losses	(76)
Ending balance	2,332		2,617
Jumbo [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	3,942
Total, Losses	60	87	737
Total Recoveries	1	9	86
Provision for loan losses	632
Ending balance	4,515		3,942
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	425
Total, Losses	20		5
Total Recoveries		60	61
Provision for loan losses	(179)
Ending balance	226		425
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	132
Total, Losses	22	32	136
Total Recoveries	21	14	95
Provision for loan losses	(26)
Ending balance	105		132
Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	21
Total, Losses	22	20	95
Total Recoveries	34	29	77
Provision for loan losses	(24)
Ending balance	$ 9		$ 21