Consolidated Statements of Changes in Stockholders' Equity (unaudited) (USD $) In Thousands, unless otherwise specified	Total	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Class A Common Stock	Class A Common Stock Retained Earnings	Class B Common Stock	Class B Common Stock Retained Earnings
Beginning balance at Dec. 31, 2011	$ 160,649	$ 11,587	$ 146,039	$ (2,519)	$ 3,548		$ 1,994
Net income	3,808		3,808		2,973		835
Other comprehensive income, net of tax:
Unrealized holding (losses) gains arising during period, net of taxes and realized net gains	1,736			1,736
Pension liability adjustment, net of taxes	162			162
Conversion of Class B Common Stock to Class A Common Stock, 2500 shares					2		(2)
Stock options exercised, 5612 and 1600 shares	127	121			6
Cash dividends paid					(425)	(425)	(120)	(120)
Ending balance at Mar. 31, 2012	165,937	11,708	149,302	(621)	3,556		1,992
Beginning balance at Dec. 31, 2012	179,990	11,891	162,892	(347)	3,568		1,986
Net income	4,476		4,476		3,502		974
Other comprehensive income, net of tax:
Unrealized holding (losses) gains arising during period, net of taxes and realized net gains	(3,116)			(3,116)
Pension liability adjustment, net of taxes	173			173
Stock options exercised, 5612 and 1600 shares	42	40			2
Cash dividends paid					(428)	(428)	(119)	(119)
Ending balance at Mar. 31, 2013	$ 181,018	$ 11,931	$ 166,821	$ (3,290)	$ 3,570		$ 1,986