Consolidated Statement of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance at beginning of period at Dec. 31, 2012	$ 221,728	$ 167,039	$ 69,158	$ 654	$ (15,123)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,022		5,022
Other comprehensive loss, net of tax	54			54
Common stock cash dividends declared	(1,295)		(1,295)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	27	27
Reissuance of treasury stock for deferred compensation plan	142				142
Purchase of treasury stock	(31)				(31)
Common shares issued under dividend reinvestment plan	95	95
Common shares issued under Board of Directors' compensation plan	40	(7)			47
Stock based compensation expense	297	297
Balance at end of period at Mar. 31, 2013	$ 226,079	$ 167,451	$ 72,885	$ 708	$ (14,965)