Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	$ 15,571		$ 15,571		$ 5,190
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(3,765)		(3,765)		(1,633)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	11,806		11,806		3,557
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,357		2,357		8,476
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	(177)		(177)		(1,047)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,180		2,180		7,429
Impaired Financing Receivable, With Related Allowance, Related Allowance	312		312		1,221
Impaired Financing Receivable, Unpaid Principal Balance	17,928		17,928		13,666
Impaired Financing Receivable, Charge-off And Payments Applied	(3,942)		(3,942)		(2,680)
Impaired Financing Receivable, Recorded Investment	13,986		13,986		10,986
Impaired Financing Receivable, Related Allowance	312		312		1,221
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	10,370	8,864	10,327	10,091
Impaired Financing Receivable, Interest Income, Accrual Method	17	13	60	22
Commercial and Industrial Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	184		184		216
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	184		184		216
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0		0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, Related Allowance	0		0		0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	189	229	200	345
Impaired Financing Receivable, Interest Income, Accrual Method	3	3	11	5
Construction And Land Development Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	5,187		5,187		3,958
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(1,869)		(1,869)		(1,572)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,318		3,318		2,386
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	477		477		2,882
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	(39)		(39)		(173)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	438		438		2,709
Impaired Financing Receivable, Related Allowance	141		141		147
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	3,801	3,589	4,357	3,843
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Commercial Real Estate Owner Occupied Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	790		790		361
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(46)		(46)		(11)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	744		744		350
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	904		904		2,255
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0		0		(29)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	904		904		2,226
Impaired Financing Receivable, Related Allowance	139		139		544
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	2,468	1,886	2,537	1,769
Impaired Financing Receivable, Interest Income, Accrual Method	14	10	49	17
Commercial Real Estate Other Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	7,922		7,922		655
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(1,546)		(1,546)		(50)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	6,376		6,376		605
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		1,242
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0		0		(41)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		1,201
Impaired Financing Receivable, Related Allowance	0		0		264
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	2,211	2,096	1,713	2,545
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Commercial Real Estate Loans, Total [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	8,712		8,712		1,016
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(1,592)		(1,592)		(61)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	7,120		7,120		955
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	904		904		3,497
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0		0		(70)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	904		904		3,427
Impaired Financing Receivable, Related Allowance	139		139		808
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	4,679	3,982	4,250	4,314
Impaired Financing Receivable, Interest Income, Accrual Method	14	10	49	17
Residential Real Estate Consumer Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	976		976		1,707
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	(138)		(138)		(797)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	838		838		910
Impaired Financing Receivable, Related Allowance	32		32		103
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	846	934	870	1,514
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Residential Real Estate Investment Property Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,488		1,488		0
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(304)		(304)		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,184		1,184		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		390
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0		0		(7)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		383
Impaired Financing Receivable, Related Allowance	0		0		163
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	855	130	650	75
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Residential Real Estate Loans, Total [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,488		1,488		0
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(304)		(304)		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,184		1,184		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	976		976		2,097
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	(138)		(138)		(804)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	838		838		1,293
Impaired Financing Receivable, Related Allowance	32		32		266
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	1,701	1,064	1,520	1,589
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Consumer Installment and Revolving Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0		0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, Related Allowance	0		0		0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	0	0	0	0
Impaired Financing Receivable, Interest Income, Accrual Method	$ 0	$ 0	$ 0	$ 0

Impaired Loans (Details) (USD $)
In Thousands, unless otherwise specified

3 Months Ended

9 Months Ended

Sep. 30, 2012

Sep. 30, 2011

Sep. 30, 2012

Sep. 30, 2011

Dec. 31, 2011

Financing Receivable, Impaired [Line Items]

Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance

$ 15,571

$ 5,190