Loans and Allowance for Loan Losses (Details 6) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Impaired loans without a valuation allowance, Recorded Investment	$ 6,274	$ 8,196
Impaired loans without a valuation allowance, Unpaid Principal Balance	6,399	8,390
Impaired loans without a valuation allowance, Average Recorded Investment	8,562	11,273
Impaired loans without a valuation allowance, Interest Income Recognized	306	575
Impaired loans with a valuation allowance, Recorded Investment	8,915	17,221
Impaired loans with a valuation allowance, Unpaid Principal Balance	8,956	17,338
Impaired loans with a valuation allowance, Related Allowance	4,046	4,976
Impaired loans with a valuation allowance, Average Recorded Investment	10,564	12,323
Impaired loans with a valuation allowance, Interest Income Recognized	457	1,066
Total impaired loans, Recorded Investment	15,189	25,417
Total impaired loans, Unpaid Principal Balance	15,355	25,728
Total impaired loans,Related Allowance	4,046	4,976
Total impaired loans, Average Recorded Investment	19,126	23,596
Total impaired loans, Interest Income Recognized	763	1,641
Commercial Real Estate Mortgage [Member]
Impaired loans without a valuation allowance, Recorded Investment	3,406	4,354
Impaired loans without a valuation allowance, Unpaid Principal Balance	3,453	4,354
Impaired loans without a valuation allowance, Average Recorded Investment	4,389	5,378
Impaired loans without a valuation allowance, Interest Income Recognized	180	330
Impaired loans with a valuation allowance, Recorded Investment	5,807	9,639
Impaired loans with a valuation allowance, Unpaid Principal Balance	5,848	9,694
Impaired loans with a valuation allowance, Related Allowance	2,230	2,605
Impaired loans with a valuation allowance, Average Recorded Investment	6,616	5,912
Impaired loans with a valuation allowance, Interest Income Recognized	215	645
Consumer Real Estate Mortgage [Member]
Impaired loans without a valuation allowance, Recorded Investment	513	322
Impaired loans without a valuation allowance, Unpaid Principal Balance	540	322
Impaired loans without a valuation allowance, Average Recorded Investment	1,538	3,589
Impaired loans without a valuation allowance, Interest Income Recognized	52	21
Impaired loans with a valuation allowance, Recorded Investment	1,353	6,195
Impaired loans with a valuation allowance, Unpaid Principal Balance	1,353	6,257
Impaired loans with a valuation allowance, Related Allowance	576	1,254
Impaired loans with a valuation allowance, Average Recorded Investment	2,606	5,333
Impaired loans with a valuation allowance, Interest Income Recognized	61	294
Construction and Land Development [Member]
Impaired loans without a valuation allowance, Recorded Investment	244	829
Impaired loans without a valuation allowance, Unpaid Principal Balance	251	1,023
Impaired loans without a valuation allowance, Average Recorded Investment	358	1,099
Impaired loans without a valuation allowance, Interest Income Recognized	19	59
Impaired loans with a valuation allowance, Recorded Investment	706	879
Impaired loans with a valuation allowance, Unpaid Principal Balance	706	879
Impaired loans with a valuation allowance, Related Allowance	460	653
Impaired loans with a valuation allowance, Average Recorded Investment	642	294
Impaired loans with a valuation allowance, Interest Income Recognized	49	62
Commercial and Industrial Loans [Member]
Impaired loans without a valuation allowance, Recorded Investment	2,111	2,691
Impaired loans without a valuation allowance, Unpaid Principal Balance	2,155	2,691
Impaired loans without a valuation allowance, Average Recorded Investment	2,277	1,207
Impaired loans without a valuation allowance, Interest Income Recognized	55	165
Impaired loans with a valuation allowance, Recorded Investment	1,049	508
Impaired loans with a valuation allowance, Unpaid Principal Balance	1,049	508
Impaired loans with a valuation allowance, Related Allowance	780	464
Impaired loans with a valuation allowance, Average Recorded Investment	700	784
Impaired loans with a valuation allowance, Interest Income Recognized	132	65
Consumer and Other Loans [Member]
Impaired loans without a valuation allowance, Recorded Investment	0	0
Impaired loans without a valuation allowance, Unpaid Principal Balance	0	0
Impaired loans without a valuation allowance, Average Recorded Investment	0	0
Impaired loans without a valuation allowance, Interest Income Recognized	0	0
Impaired loans with a valuation allowance, Recorded Investment	0	0
Impaired loans with a valuation allowance, Unpaid Principal Balance	0	0
Impaired loans with a valuation allowance, Related Allowance	0	0
Impaired loans with a valuation allowance, Average Recorded Investment	0	0
Impaired loans with a valuation allowance, Interest Income Recognized	$ 0	$ 0