Loans and Allowance - Activity in allowance for loan losses (Details 1) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Loans Receivable	Mar. 31, 2012 Loans Receivable	Mar. 31, 2013 Loans Receivable Construction / Land	Mar. 31, 2012 Loans Receivable Construction / Land	Mar. 31, 2013 Loans Receivable 1-4 Family	Mar. 31, 2012 Loans Receivable 1-4 Family	Mar. 31, 2013 Loans Receivable Multi-Family	Mar. 31, 2012 Loans Receivable Multi-Family	Mar. 31, 2013 Loans Receivable Nonresidential real estate and agricultural land	Mar. 31, 2012 Loans Receivable Nonresidential real estate and agricultural land	Mar. 31, 2013 Loans Receivable Commercial	Mar. 31, 2012 Loans Receivable Commercial	Mar. 31, 2013 Loans Receivable Consumer	Mar. 31, 2012 Loans Receivable Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balances at beginning of period	$ 3,884	$ 3,564	$ 3,564	$ 4,003	$ 648	$ 1,016	$ 1,423	$ 1,986	$ 281	$ 65	$ 1,078	$ 822	$ 133	$ 70	$ 1	$ 44
Provision for losses			318	474	152	(246)	176	397	(3)	(48)	(18)	433	2	(64)	9	2
Loans charged off			(332)	(1,310)	(61)	(340)	(65)	(915)			(175)	(29)			(31)	(26)
Recoveries on loans			334	11	18			4			294				22	7
Balances at end of period	$ 3,884	$ 3,564	$ 3,884	$ 3,178	$ 757	$ 430	$ 1,534	$ 1,472	$ 278	$ 17	$ 1,179	$ 1,226	$ 135	$ 6	$ 1	$ 27