Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	$ 6,049		$ 6,049		$ 13,228
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(2,261)		(2,261)		(4,018)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,788		3,788		9,210
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,947		1,947		1,370
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	(61)		(61)		(45)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,886		1,886		1,325
Impaired Financing Receivable, With Related Allowance, Related Allowance	284		284		263
Impaired Financing Receivable, Unpaid Principal Balance	7,996		7,996		14,598
Impaired Financing Receivable, Charge-off And Payments Applied	(2,322)		(2,322)		(4,063)
Impaired Financing Receivable, Recorded Investment	5,674		5,674		10,535
Impaired Financing Receivable, Related Allowance	284		284		263
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	5,501	10,370	6,458	10,327
Impaired Financing Receivable, Interest Income, Accrual Method	19	17	53	60
Commercial and Industrial Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	136		136		169
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	136		136		169
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	139	189	152	200
Impaired Financing Receivable, Interest Income, Accrual Method	2	3	7	11
Construction And Land Development Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,879		2,879		2,879
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(1,682)		(1,682)		(1,682)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,197		1,197		1,197
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	457		457		471
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	(61)		(61)		(45)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	396		396		426
Impaired Financing Receivable, Related Allowance	99		99		129
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	1,596	3,801	1,608	4,357
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	1,220		1,220		787
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(180)		(180)		(212)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,040		1,040		575
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	882		882		899
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0		0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	882		882		899
Impaired Financing Receivable, Related Allowance	117		117		134
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	1,927	2,468	1,993	2,537
Impaired Financing Receivable, Interest Income, Accrual Method	13	14	42	49
Commercial Real Estate Other Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	516		516		7,914
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(90)		(90)		(1,862)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	426		426		6,052
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	832	2,211	1,581	1,713
Impaired Financing Receivable, Interest Income, Accrual Method	4	0	4	0
Commercial Real Estate Loans, Total [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,736		1,736		8,701
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(270)		(270)		(2,074)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,466		1,466		6,627
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,490		1,490		899
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0		0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,490		1,490		899
Impaired Financing Receivable, Related Allowance	185		185		134
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	2,759	4,679	3,574	4,250
Impaired Financing Receivable, Interest Income, Accrual Method	17	14	46	49
Residential Real Estate Consumer Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	958		958		971
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(186)		(186)		(152)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	772		772		819
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	776	846	801	870
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	340		340		508
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(123)		(123)		(110)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	217		217		398
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, Related Allowance	0		0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	231	855	323	650
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	1,298		1,298		1,479
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(309)		(309)		(262)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	989		989		1,217
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, Related Allowance	0		0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	1,007	1,701	1,124	1,520
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Consumer Installment and Revolving Loans [Member]
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, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Financing Receivable, Impaired [Line Items]

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

$ 6,049

$ 13,228