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
	Mar. 31, 2013	Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Investment	$ 14,597	$ 16,496
Total impaired loans, interest income recognized	54	69
Construction / Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Investment	4,820	4,581
Total impaired loans, interest income recognized	4
1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Investment	4,673	5,881
Total impaired loans, interest income recognized	32	21
Multi-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Investment	1,091	1,957
Total impaired loans, interest income recognized		22
Nonresidential real estate and agricultural land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Investment	3,395	3,664
Total impaired loans, interest income recognized	17	19
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Investment	606	396
Total impaired loans, interest income recognized	1	7
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Investment	12	17
Total impaired loans, interest income recognized