Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $) In Thousands, unless otherwise specified	Total	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Income (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, 2010	$ 145,025	$ 11,537	$ 131,526	$ (3,578)	$ 3,529		$ 2,011
Net income	3,725		3,725
Unrealized holding losses arising during period, net of $482 and $1,117 in taxes and $164 and $148 in realized net gains	(687)			(687)
Pension liability adjustment, net of $63 and $189 in taxes	95			95
Comprehensive income
Conversion of class B common stock to class A common stock, 14,500 and 2,500 shares respectively					14		(14)
Stock options exercised, 350 and 5612 shares	6	5			1
Cash dividends paid, Class A and Class B common stock, $.12 and $.06 per share respectively					(424)	(424)	(120)	(120)
Ending balance at Mar. 31, 2011	147,620	11,542	134,707	(4,170)	3,544		1,997
Beginning balance at Dec. 31, 2011	160,649	11,587	146,039	(2,519)	3,548		1,994
Net income	3,808		3,808
Unrealized holding losses arising during period, net of $482 and $1,117 in taxes and $164 and $148 in realized net gains	1,736			1,736
Pension liability adjustment, net of $63 and $189 in taxes	162			162
Comprehensive income
Conversion of class B common stock to class A common stock, 14,500 and 2,500 shares respectively					2		(2)
Stock options exercised, 350 and 5612 shares	127	121			6
Cash dividends paid, Class A and Class B common stock, $.12 and $.06 per share respectively					(425)	(425)	(120)	(120)
Ending balance at Mar. 31, 2012	$ 165,937	$ 11,708	$ 149,302	$ (621)	$ 3,556		$ 1,992