Loans and Allowance for Loan Losses Schedule of Troubled Debt Restructured Loans that Subsequently Defaulted (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013 loans	Sep. 30, 2012 loans	Sep. 30, 2013 loans	Sep. 30, 2012 loans
Loans, Modifications [Line Items]
Loans, Modifications, Subsequent Default, Recorded Investment	$ 135	$ 894	$ 135	$ 894
Loans, Modifications, Subsequent Default, Number of Contracts	2	2	2	2
Commercial loan [Member]
Loans, Modifications [Line Items]
Loans, Modifications, Subsequent Default, Recorded Investment	0	0	0	0
Loans, Modifications, Subsequent Default, Number of Contracts	0	0	0	0
Construction, land, and land development [Member]
Loans, Modifications [Line Items]
Loans, Modifications, Subsequent Default, Recorded Investment	0	0	0	0
Loans, Modifications, Subsequent Default, Number of Contracts	0	0	0	0
1-4 family residential first mortgages [Member]
Loans, Modifications [Line Items]
Loans, Modifications, Subsequent Default, Recorded Investment	104	74	104	74
Loans, Modifications, Subsequent Default, Number of Contracts	1	1	1	1
Home equity loan [Member]
Loans, Modifications [Line Items]
Loans, Modifications, Subsequent Default, Recorded Investment	0	0	0	0
Loans, Modifications, Subsequent Default, Number of Contracts	0	0	0	0
Commercial real estate [Member]
Loans, Modifications [Line Items]
Loans, Modifications, Subsequent Default, Recorded Investment	0	820	0	820
Loans, Modifications, Subsequent Default, Number of Contracts	0	1	0	1
Consumer and other loans [Member]
Loans, Modifications [Line Items]
Loans, Modifications, Subsequent Default, Recorded Investment	$ 31	$ 0	$ 31	$ 0
Loans, Modifications, Subsequent Default, Number of Contracts	1	0	1	0