Quarterly Results of Operations (Schedule of Quarterly Financial Information) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Results of Operations [Abstract]
Interest Income	$ 12,893	$ 12,803	$ 12,744	$ 12,738	$ 12,848	$ 13,041	$ 12,877	$ 12,901	$ 13,431	$ 13,908	$ 14,100	$ 13,909	$ 51,178	$ 51,667	$ 55,348
Interest Expense	2,255	2,163	2,186	2,319	2,644	2,801	2,857	2,922	3,320	3,593	3,750	4,041	8,923	11,224	14,704
Net Interest Income	10,638	10,640	10,558	10,419	10,204	10,240	10,020	9,979	10,111	10,315	10,350	9,868	42,255	40,443	40,644
Provision for loan losses			500	350	(950)	750	550	950	1,350	1,475	1,850	1,350	850	1,300	6,025
Net Income Loss	3,604	2,694	2,557	1,963	2,640	2,472	2,112	1,976	2,003	2,173	1,644	1,426	10,818	9,200	7,246
Net Income Available to Common Shareholders	$ 3,604	$ 2,694	$ 2,557	$ 1,963	$ 2,294	$ 2,201	$ 1,834	$ 1,614	$ 1,641	$ 1,811	$ 1,282	$ 1,066	$ 10,818	$ 7,943	$ 5,800
Earnings per share, basic	$ 0.49	$ 0.38	$ 0.36	$ 0.28	$ 0.32	$ 0.31	$ 0.26	$ 0.23	$ 0.23	$ 0.26	$ 0.18	$ 0.16	$ 1.51	$ 1.12	$ 0.83
Earnings per share, diluted	$ 0.48	$ 0.36	$ 0.35	$ 0.27	$ 0.32	$ 0.30	$ 0.25	$ 0.22	$ 0.23	$ 0.26	$ 0.18	$ 0.15	$ 1.46	$ 1.09	$ 0.82