Loans and Allowance for Loan Losses - Allocation of loan loss reserves by loan category (Details 1) (USD $) In Thousands, unless otherwise specified			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Loans Receivable	Sep. 30, 2012 Loans Receivable	Sep. 30, 2013 Loans Receivable	Sep. 30, 2012 Loans Receivable	Sep. 30, 2013 Loans Receivable Commercial	Sep. 30, 2012 Loans Receivable Commercial	Sep. 30, 2013 Loans Receivable Commercial	Sep. 30, 2012 Loans Receivable Commercial	Sep. 30, 2013 Loans Receivable Owner Occupied 1-4	Sep. 30, 2012 Loans Receivable Owner Occupied 1-4	Sep. 30, 2013 Loans Receivable Owner Occupied 1-4	Sep. 30, 2012 Loans Receivable Owner Occupied 1-4	Sep. 30, 2013 Loans Receivable Non-owner Occupied 1-4	Sep. 30, 2012 Loans Receivable Non-owner Occupied 1-4	Sep. 30, 2013 Loans Receivable Non-owner Occupied 1-4	Sep. 30, 2012 Loans Receivable Non-owner Occupied 1-4	Sep. 30, 2013 Loans Receivable Multi-family	Sep. 30, 2012 Loans Receivable Multi-family	Sep. 30, 2013 Loans Receivable Multi-family	Sep. 30, 2012 Loans Receivable Multi-family	Sep. 30, 2013 Loans Receivable Commercial Real Estate	Sep. 30, 2012 Loans Receivable Commercial Real Estate	Sep. 30, 2013 Loans Receivable Commercial Real Estate	Sep. 30, 2012 Loans Receivable Commercial Real Estate	Sep. 30, 2013 Loans Receivable Construction	Sep. 30, 2012 Loans Receivable Construction	Sep. 30, 2013 Loans Receivable Construction	Sep. 30, 2012 Loans Receivable Construction	Sep. 30, 2013 Loans Receivable Land	Sep. 30, 2012 Loans Receivable Land	Sep. 30, 2013 Loans Receivable Land	Sep. 30, 2012 Loans Receivable Land	Sep. 30, 2013 Loans Receivable Consumer and Home Equity	Sep. 30, 2012 Loans Receivable Consumer and Home Equity	Sep. 30, 2013 Loans Receivable Consumer and Home Equity	Sep. 30, 2012 Loans Receivable Consumer and Home Equity
Allowance for losses
Beginning balance	$ 6,407	$ 5,900	$ 6,346	$ 5,268	$ 5,900	$ 5,331	$ 915	$ 684	$ 633	$ 667	$ 552	$ 432	$ 589	$ 436	$ 990	$ 1,118	$ 1,022	$ 1,330	$ 1,001	$ 888	$ 1,055	$ 646	$ 2,259	$ 1,859	$ 2,177	$ 1,788	$ 46	$ 8	$ 62	$ 64	$ 348	$ 120	$ 154	$ 264	$ 235	$ 159	$ 208	$ 136
Provision charged to expense			25	500	650	1,600	(138)	(61)	156	400	(8)	159	(46)	171	5	(158)	98	(351)	(73)	(9)	(127)	492	231	524	364	1,011	(12)	19	(28)	(37)	(9)	(10)	177	(155)	29	36	56	70
Losses charged off			(26)	(370)	(357)	(1,588)	(3)		(32)	(462)		(42)		(58)		(45)	(241)	(83)				(259)	12	(283)	(39)	(699)							(10)	(16)	(35)		(35)	(11)
Recoveries			62	84	214	138	39	8	56	26			1		3	3	119	22		1		1	8		8						12	72	30	89
Ending balance	$ 6,407	$ 5,900	$ 6,407	$ 5,482	$ 6,407	$ 5,482	$ 813	$ 631	$ 813	$ 631	$ 544	$ 549	$ 544	$ 549	$ 998	$ 918	$ 998	$ 918	$ 928	$ 880	$ 928	$ 880	$ 2,510	$ 2,100	$ 2,510	$ 2,100	$ 34	$ 27	$ 34	$ 27	$ 351	$ 182	$ 351	$ 182	$ 229	$ 195	$ 229	$ 195