Loans and Allowance for Loan Losses Schedule of Allowance for Loan Losses by Impairment Method (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Loans, Allowance for Loan Losses [Line Items]
Allowance for loan losses, individually evaluated for impairment	$ 2,916	$ 3,182
Allowance for loan losses, collectively evaluated for impairment	12,721	13,596
Allowance for loan losses	15,637	16,778
Commercial loan [Member]
Loans, Allowance for Loan Losses [Line Items]
Allowance for loan losses, individually evaluated for impairment	130	100
Allowance for loan losses, collectively evaluated for impairment	3,227	4,309
Allowance for loan losses	3,357	4,409
Construction, land, and land development [Member]
Loans, Allowance for Loan Losses [Line Items]
Allowance for loan losses, individually evaluated for impairment	2,500	2,630
Allowance for loan losses, collectively evaluated for impairment	1,956	942
Allowance for loan losses	4,456	3,572
1-4 family residential first mortgages [Member]
Loans, Allowance for Loan Losses [Line Items]
Allowance for loan losses, individually evaluated for impairment	0	84
Allowance for loan losses, collectively evaluated for impairment	897	1,131
Allowance for loan losses	897	1,215
Home equity [Member]
Loans, Allowance for Loan Losses [Line Items]
Allowance for loan losses, individually evaluated for impairment	86	156
Allowance for loan losses, collectively evaluated for impairment	534	676
Allowance for loan losses	620	832
Commercial real estate [Member]
Loans, Allowance for Loan Losses [Line Items]
Allowance for loan losses, individually evaluated for impairment	200	200
Allowance for loan losses, collectively evaluated for impairment	6,051	6,467
Allowance for loan losses	6,251	6,667
Consumer and other loans [Member]
Loans, Allowance for Loan Losses [Line Items]
Allowance for loan losses, individually evaluated for impairment	0	12
Allowance for loan losses, collectively evaluated for impairment	56	71
Allowance for loan losses	$ 56	$ 83