Consolidated Statements of Changes In Stockholders' Equity (Unaudited) (USD $) In Thousands	Total	Class A Common Stock	Class B Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Class A Common Stock	Retained Earnings Class B Common Stock	Accumulated Other Comprehensive Income (Loss)
Begining Balance at Dec. 31, 2009	$ 132,730	$ 3,516	$ 2,014	$ 11,376	$ 120,125			$ (4,301)
Net income	6,383				6,383
Other comprehensive income, net of tax:
Unrealized holding losses arising during period, net of $1,527 and $2098 in taxes and $378 and $362 in realized net gains, respectively	4,762							4,762
Pension liability adjustment, net of $81 and $126 in taxes, respectively	244							244
Comprehensive income	11,389
Conversion of class B common stock to class A common stock, 3,150 and 14,500 shares, respectively		3	(3)
Cash dividends paid		(844)	(241)			(844)	(241)
Ending Balance at Jun. 30, 2010	143,034	3,519	2,011	11,376	125,423			705
Begining Balance at Dec. 31, 2010	145,025	3,529	2,011	11,537	131,526			(3,578)
Net income	7,922				7,922
Other comprehensive income, net of tax:
Unrealized holding losses arising during period, net of $1,527 and $2098 in taxes and $378 and $362 in realized net gains, respectively	3,290							3,290
Pension liability adjustment, net of $81 and $126 in taxes, respectively	190							190
Comprehensive income	11,402
Conversion of class B common stock to class A common stock, 3,150 and 14,500 shares, respectively		14	(14)
Stock options exercised, 350 shares	6	1		5
Cash dividends paid		(850)	(241)			(850)	(241)
Ending Balance at Jun. 30, 2011	$ 155,342	$ 3,544	$ 1,997	$ 11,542	$ 138,357			$ (98)