Quarterly Financial Data (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																							12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2010		Sep. 30, 2010		Jun. 30, 2010		Mar. 31, 2010		Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2010
Quarterly Financial Statements [Line Items]
Interest income	$ 9,412	$ 9,104	[1]	$ 10,276	[1]	$ 10,265	[1]	$ 10,558	[1]	$ 10,991	[1]	$ 11,254	[1]	$ 11,698	[1]	$ 11,809	[1]	$ 12,083	[1]	$ 13,045	[1]	$ 12,596	[1]	$ 39,057	$ 44,501	[1]	$ 49,533	[1]
Interest expense	2,587	3,027	[1]	3,336	[1]	3,552	[1]	3,659	[1]	3,856	[1]	3,946	[1]	4,126	[1]	4,448	[1]	4,906	[1]	4,995	[1]	4,980	[1]	12,502	15,587	[1]	19,329	[1]
Net interest income	6,825	6,077	[1]	6,940	[1]	6,713	[1]	6,899	[1]	7,135	[1]	7,308	[1]	7,572	[1]	7,361	[1]	7,177	[1]	8,050	[1]	7,616	[1]	26,555	28,914	[1]	30,204	[1]
Provision for loan losses	300	0	[1]	0	[1]	465	[1]	141	[1]	850	[1]	2,987	[1]	634	[1]	1,200	[1]	1,000	[1]	1,000	[1]	2,544	[1]	765	4,612	[1]	5,744	[1]
Net interest income after provision for loan losses	6,525	6,077	[1]	6,940	[1]	6,248	[1]	6,758	[1]	6,285	[1]	4,321	[1]	6,938	[1]	6,161	[1]	6,177	[1]	7,050	[1]	5,072	[1]	25,790	24,302	[1]	24,460	[1]
Other income	1,478	1,039	[1]	835	[1]	891	[1]	873	[1]	628	[1]	447	[1]	562	[1]	921	[1]	724	[1]	537	[1]	563	[1]	4,243	2,510	[1]	2,745	[1]
Other expenses	5,815	5,961	[1]	5,732	[1]	6,139	[1]	5,605	[1]	5,800	[1]	6,019	[1]	6,626	[1]	5,893	[1]	5,947	[1]	6,466	[1]	6,368	[1]	23,647	24,050	[1]	24,674	[1]
Income before income tax provision	2,188	1,155	[1]	2,043	[1]	1,000	[1]	2,026	[1]	1,113	[1]	(1,251)	[1]	874	[1]	1,189	[1]	954	[1]	1,121	[1]	(733)	[1]	6,386	2,762	[1]	2,531	[1]
Income tax provision	914	481	[1]	840	[1]	423	[1]	860	[1]	467	[1]	(495)	[1]	378	[1]	529	[1]	418	[1]	488	[1]	(263)	[1]	2,658	1,210	[1]	1,172	[1]
Net income	1,274	674	[1]	1,203	[1]	577	[1]	1,166	[1]	646	[1]	(756)	[1]	496	[1]	660	[1]	536	[1]	633	[1]	(470)	[1]	3,728	1,552	[1]	1,359	[1]
Per share data [Abstract]
Earnings (loss) - basic (in dollars per share)	$ 0.09	$ 0.03	[1]	$ 0.08	[1]	$ 0.02	[1]	$ 0.07	[1]	$ 0.02	[1]	$ (0.12)	[1]	$ 0.01	[1]	$ 0.02	[1]	$ 0.02	[1]	$ 0.02	[1]	$ (0.09)	[1]	$ 0.22	$ (0.02)	[1]	$ (0.04)	[1]
Earnings (loss) - diluted (in dollars per share)	$ 0.09	$ 0.03	[1]	$ 0.08	[1]	$ 0.02	[1]	$ 0.07	[1]	$ 0.02	[1]	$ (0.12)	[1]	$ 0.01	[1]	$ 0.02	[1]	$ 0.02	[1]	$ 0.02	[1]	$ (0.09)	[1]	$ 0.22	$ (0.02)	[1]	$ (0.04)	[1]
Decrease in FDIC assessment net of taxes		116	[1]	106	[1]	105	[1]	99	[1]	95	[1]	90	[1]	49	[1]	53	[1]	51	[1]	40	[1]	58	[1]
Increase in earnings (in dollars per share)		$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.01	[1]	$ 0.00	[1]	$ 0.01	[1]	$ 0.00	[1]	$ 0.01	[1]
Earnings - basic and diluted as reported (in dollars per share)		$ 0.03	[1]	$ 0.08	[1]	$ 0.02	[1]	$ 0.07	[1]	$ 0.02	[1]	$ (0.12)	[1]	$ 0.01	[1]	$ 0.02	[1]	$ 0.02	[1]	$ 0.02	[1]	$ (0.09)	[1]
As Reported [Member]
Quarterly Financial Statements [Line Items]
Other expenses																									24,611		25,008
Income tax provision																									982		1,040
Net income		$ 558		$ 1,097		$ 472		$ 1,067		$ 551		$ (846)		$ 447		$ 607		$ 485		$ 593		$ (528)			$ 1,219		$ 1,157
Per share data [Abstract]
Earnings (loss) - basic (in dollars per share)																									$ (0.05)		$ (0.06)
Earnings (loss) - diluted (in dollars per share)																									$ (0.05)		$ (0.06)
Earnings - basic and diluted as reported (in dollars per share)		$ 0.02		$ 0.07		$ 0.01		$ 0.06		$ 0.01		$ (0.13)		$ 0.00		$ 0.02		$ 0.01		$ 0.02		$ (0.1)

[1] Restated