Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	$ 5,083		$ 13,228
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(2,002)		(4,018)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,081		9,210
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,364		1,370
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	(52)		(45)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,312		1,325
Impaired Financing Receivable, With Related Allowance, Related Allowance	449		263
Impaired Financing Receivable, Unpaid Principal Balance	7,447		14,598
Impaired Financing Receivable, Charge-off And Payments Applied	(2,054)		(4,063)
Impaired Financing Receivable, Recorded Investment	5,393		10,535
Impaired Financing Receivable, Related Allowance	449		263
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	7,947	10,731
Impaired Financing Receivable, Interest Income, Accrual Method	17	21
Commercial and Industrial Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	160		169
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	160		169
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	164	211
Impaired Financing Receivable, Interest Income, Accrual Method	3	4
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
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(1,682)		(1,682)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,197		1,197
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	467		471
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	(49)		(45)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	418		426
Impaired Financing Receivable, Related Allowance	121		129
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	1,619	4,902
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Commercial Real Estate Owner Occupied Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	354		787
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(47)		(212)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	307		575
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,765		899
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,765		899
Impaired Financing Receivable, Related Allowance	244		134
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	2,044	2,570
Impaired Financing Receivable, Interest Income, Accrual Method	14	17
Commercial Real Estate Other Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	513		7,914
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(84)		(1,862)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	429		6,052
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	3,004	1,691
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Commercial Real Estate Loans, Total [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	867		8,701
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(131)		(2,074)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	736		6,627
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,765		899
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,765		899
Impaired Financing Receivable, Related Allowance	244		134
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	5,048	4,261
Impaired Financing Receivable, Interest Income, Accrual Method	14	17
Residential Real Estate Consumer Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	966		971
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(164)		(152)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	802		819
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0
Impaired Financing Receivable, Related Allowance	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	811	894
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Residential Real Estate Investment Property Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	211		508
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(25)		(110)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	186		398
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	132
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	(3)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	129
Impaired Financing Receivable, Related Allowance	84
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	305	463
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Residential Real Estate Loans, Total [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,177		1,479
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(189)		(262)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	988		1,217
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	132
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	(3)
Impaired Financing Receivable, with Related Allowance, Recorded Investment	129
Impaired Financing Receivable, Related Allowance	84
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired Financing Receivable, Average Recorded Investment	1,116	1,357
Impaired Financing Receivable, Interest Income, Accrual Method	$ 0	$ 0