Impaired Loans and Valuation Allowance for Loan Losses (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Recorded Investment
Recorded Investment, Total	$ 103,324	$ 100,137
Unpaid Principal Balance, Total	118,134	110,211
Related Valuation Allowance, Total	9,273	6,979
Construction and land development [Member]
Recorded Investment
With No Related Allowance, Recorded Investment	1,468	1,616
With No Related Allowance, Unpaid Principal Balance	1,953	2,431
With No Related Allowance, Related Valuation Allowance	0	0
With Related Allowance, Recorded Investment	3,403	3,777
With Related Allowance, Unpaid Principal Balance	3,479	4,131
With Related Allowance, Related Valuation Allowance	449	375
Recorded Investment, Total	4,871	5,393
Unpaid Principal Balance, Total	5,432	6,562
Related Valuation Allowance, Total	449	375
Commercial real estate [Member]
Recorded Investment
With No Related Allowance, Recorded Investment	10,140	19,101
With No Related Allowance, Unpaid Principal Balance	14,639	22,219
With No Related Allowance, Related Valuation Allowance	0	0
With Related Allowance, Recorded Investment	45,038	39,199
With Related Allowance, Unpaid Principal Balance	48,996	39,824
With Related Allowance, Related Valuation Allowance	4,615	3,385
Recorded Investment, Total	55,178	58,300
Unpaid Principal Balance, Total	63,635	62,043
Related Valuation Allowance, Total	4,615	3,385
Residential real estate [Member]
Recorded Investment
With No Related Allowance, Recorded Investment	15,726	9,128
With No Related Allowance, Unpaid Principal Balance	20,821	13,442
With No Related Allowance, Related Valuation Allowance	0	0
With Related Allowance, Recorded Investment	26,493	26,140
With Related Allowance, Unpaid Principal Balance	26,932	26,940
With Related Allowance, Related Valuation Allowance	4,099	3,099
Recorded Investment, Total	42,219	35,268
Unpaid Principal Balance, Total	47,753	40,382
Related Valuation Allowance, Total	4,099	3,099
Commercial and financial [Member]
Recorded Investment
With No Related Allowance, Recorded Investment	6	16
With No Related Allowance, Unpaid Principal Balance	6	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	40	117
Unpaid Principal Balance, Total	235	117
Related Valuation Allowance, Total	1	8
Consumer [Member]
Recorded Investment
With No Related Allowance, Recorded Investment	431	481
With No Related Allowance, Unpaid Principal Balance	481	523
With No Related Allowance, Related Valuation Allowance	0	0
With Related Allowance, Recorded Investment	585	578
With Related Allowance, Unpaid Principal Balance	598	584
With Related Allowance, Related Valuation Allowance	109	112
Recorded Investment, Total	1,016	1,059
Unpaid Principal Balance, Total	1,079	1,107
Related Valuation Allowance, Total	$ 109	$ 112