Loans and Allowance - Information pertaining to average balances of and interest recognized on impaired loans (Details 7) (Loans Receivable, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Investment	$ 16,319	$ 15,777	$ 14,693	$ 16,138
Total impaired loans, interest income recognized	278	83	332	153
Construction / Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Investment	4,834	4,627	4,597	4,604
Total impaired loans, interest income recognized	67	1	72	1
1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Investment	5,243	3,793	4,770	4,825
Total impaired loans, interest income recognized	58	31	90	52
Multi-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Investment	1,088	3,086	1,090	2,534
Total impaired loans, interest income recognized	13	27	13	50
Nonresidential and agricultural land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Investment	4,726	3,741	3,745	3,703
Total impaired loans, interest income recognized	120	15	136	33
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Investment	417	515	480	456
Total impaired loans, interest income recognized	20	9	20	17
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Investment	11	15	11	16
Total impaired loans, interest income recognized			$ 1