Loans and Allowance for Loan Losses Schedule of Nonperforming Loans (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013 loans		Dec. 31, 2012 loans
Loans, Nonperforming [Line Items]
Loans, recorded investment, nonaccrual status	$ 7,286		$ 6,400
Loans, recorded investment, 90 days past due and still accruing	1,046	[1]	0
Loans, recorded investment, troubled debt restructured	528		856
Troubled Debt Restructured Loans Included in the Nonaccrual Category	819		810
Number of Troubled Debt Restructured Loans Included in the Nonaccrual Category (number of loans)	3		1
Commercial loan [Member]
Loans, Nonperforming [Line Items]
Loans, recorded investment, 90 days past due and still accruing	537	[1]	0
Construction, land, and land development [Member]
Loans, Nonperforming [Line Items]
Loans, recorded investment, 90 days past due and still accruing	0	[1]	0
1-4 family residential first mortgages [Member]
Loans, Nonperforming [Line Items]
Loans, recorded investment, 90 days past due and still accruing	0	[1]	0
Home equity loan [Member]
Loans, Nonperforming [Line Items]
Loans, recorded investment, 90 days past due and still accruing	0	[1]	0
Commercial real estate [Member]
Loans, Nonperforming [Line Items]
Loans, recorded investment, 90 days past due and still accruing	509	[1]	0
Consumer and other loans [Member]
Loans, Nonperforming [Line Items]
Loans, recorded investment, 90 days past due and still accruing	0	[1]	0
Nonperforming Loan [Member]
Loans, Nonperforming [Line Items]
Loans, recorded investment, nonaccrual status	7,286		6,400
Loans, recorded investment, 90 days past due and still accruing	1,046	[2]	0	[2]
Loans, recorded investment, troubled debt restructured	528	[3]	856	[3]
Loans, Recorded Investment, Nonperforming Lns	8,860		7,256
Nonperforming Loan [Member] | Commercial loan [Member]
Loans, Nonperforming [Line Items]
Loans, recorded investment, nonaccrual status	4,874		655
Loans, recorded investment, 90 days past due and still accruing	537	[2]	0	[2]
Loans, recorded investment, troubled debt restructured	0	[3]	20	[3]
Nonperforming Loan [Member] | Construction, land, and land development [Member]
Loans, Nonperforming [Line Items]
Loans, recorded investment, nonaccrual status	0		3,356
Loans, recorded investment, 90 days past due and still accruing	0	[2]	0	[2]
Loans, recorded investment, troubled debt restructured	435	[3]	470	[3]
Nonperforming Loan [Member] | 1-4 family residential first mortgages [Member]
Loans, Nonperforming [Line Items]
Loans, recorded investment, nonaccrual status	773		406
Loans, recorded investment, 90 days past due and still accruing	0	[2]	0	[2]
Loans, recorded investment, troubled debt restructured	0	[3]	273	[3]
Nonperforming Loan [Member] | Home equity loan [Member]
Loans, Nonperforming [Line Items]
Loans, recorded investment, nonaccrual status	8		0
Loans, recorded investment, 90 days past due and still accruing	0	[2]	0	[2]
Loans, recorded investment, troubled debt restructured	0	[3]	0	[3]
Nonperforming Loan [Member] | Commercial real estate [Member]
Loans, Nonperforming [Line Items]
Loans, recorded investment, nonaccrual status	1,631		1,983
Loans, recorded investment, 90 days past due and still accruing	509	[2]	0	[2]
Loans, recorded investment, troubled debt restructured	93	[3]	93	[3]
Nonperforming Loan [Member] | Consumer and other loans [Member]
Loans, Nonperforming [Line Items]
Loans, recorded investment, nonaccrual status	0		0
Loans, recorded investment, 90 days past due and still accruing	0	[2]	0	[2]
Loans, recorded investment, troubled debt restructured	$ 0	[3]	$ 0	[3]

[1] (1)Subsequent to September 30, 2013, the two loans comprising the category 90 Days Past Due and Still Accruing, were brought current by the borrowers.

[2] Subsequent to September 30, 2013, the two loans comprising this category were brought current by the borrowers.

[3] While TDR loans are commonly reported by the industry as nonperforming, those not classified in the nonaccrual category are accruing interest due to payment performance. TDR loans on nonaccrual status, if any, are included in the nonaccrual category. As of September 30, 2013, there were three TDR loans totaling $819 included in the nonaccrual category. As of December 31, 2012, there was one TDR loan with a balance of $810 included in the nonaccrual category.