Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information (Unaudited) [Abstract]

Schedule of quarterly financial information

(Dollars in thousands except per share amounts)	2012
	4th		3rd		2nd		1st
Operating revenue	$	46,582	$	45,813	$	43,857	$	46,944
Operating income	$	5,090	$	4,557	$	4,487	$	5,252
Net income	$	2,525	$	1,741	$	1,738	$	2,294
Basic earnings per share	$	0.19	$	0.13	$	0.13	$	0.17
Fully diluted earnings per share	$	0.19	$	0.13	$	0.13	$	0.17
Dividends per share	$	0.145	$	0.14	$	0.14	$	0.14

(Dollars in thousands except per share amounts)	2011
	4th		3rd		2nd		1st
Operating revenue	$	39,564	$	45,244	$	40,108	$	38,622
Operating income	$	3,645	$	6,342	$	5,002	$	4,666
Net income	$	1,574	$	2,133	$	2,348	$	2,346
Basic earnings per share	$	0.12	$	0.16	$	0.18	$	0.18
Fully diluted earnings per share	$	0.12	$	0.16	$	0.18	$	0.18
Dividends per share	$	0.14	$	0.135	$	0.135	$	0.135