Impaired Loans and Valuation Allowance for Loan Losses (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Recorded Investment
Recorded Investment, Total	$ 88,629	$ 100,137
Unpaid Principal Balance, Total	90,485	110,211
Related Valuation Allowance, Total	8,518	6,979
Construction and Land Development [Member]
Recorded Investment
With No Related Allowance, Recorded Investment	1,103	1,616
With No Related Allowance, Unpaid Principal Balance	1,447	2,431
With No Related Allowance, Related Valuation Allowance	0	0
With Related Allowance, Recorded Investment	3,422	3,777
With Related Allowance, Unpaid Principal Balance	3,047	4,131
With Related Allowance, Related Valuation Allowance	444	375
Recorded Investment, Total	4,525	5,393
Unpaid Principal Balance, Total	4,494	6,562
Related Valuation Allowance, Total	444	375
Commercial Real Estate [Member]
Recorded Investment
With No Related Allowance, Recorded Investment	13,199	19,101
With No Related Allowance, Unpaid Principal Balance	18,410	22,219
With No Related Allowance, Related Valuation Allowance	0	0
With Related Allowance, Recorded Investment	31,634	39,199
With Related Allowance, Unpaid Principal Balance	32,032	39,824
With Related Allowance, Related Valuation Allowance	3,533	3,385
Recorded Investment, Total	44,833	58,300
Unpaid Principal Balance, Total	50,442	62,043
Related Valuation Allowance, Total	3,533	3,385
Residential Real Estate [Member]
Recorded Investment
With No Related Allowance, Recorded Investment	12,147	9,128
With No Related Allowance, Unpaid Principal Balance	9,644	13,442
With No Related Allowance, Related Valuation Allowance	0	0
With Related Allowance, Recorded Investment	26,134	26,140
With Related Allowance, Unpaid Principal Balance	24,655	26,940
With Related Allowance, Related Valuation Allowance	4,440	3,099
Recorded Investment, Total	38,281	35,268
Unpaid Principal Balance, Total	34,299	40,382
Related Valuation Allowance, Total	4,440	3,099
Commercial and Financial [Member]
Recorded Investment
With No Related Allowance, Recorded Investment	3	16
With No Related Allowance, Unpaid Principal Balance	4	16
With No Related Allowance, Related Valuation Allowance	0	0
With Related Allowance, Recorded Investment	34	101
With Related Allowance, Unpaid Principal Balance	229	101
With Related Allowance, Related Valuation Allowance	1	8
Recorded Investment, Total	37	117
Unpaid Principal Balance, Total	233	117
Related Valuation Allowance, Total	1	8
Consumer [Member]
Recorded Investment
With No Related Allowance, Recorded Investment	391	481
With No Related Allowance, Unpaid Principal Balance	440	523
With No Related Allowance, Related Valuation Allowance	0	0
With Related Allowance, Recorded Investment	562	578
With Related Allowance, Unpaid Principal Balance	577	584
With Related Allowance, Related Valuation Allowance	100	112
Recorded Investment, Total	953	1,059
Unpaid Principal Balance, Total	1,017	1,107
Related Valuation Allowance, Total	$ 100	$ 112