Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Taxes on unrealized holding losses	$ 2,023	$ 1,117
Net gains on sales of investments	883	148
Taxes on pension liabilities adjustments	$ 117	$ 189
Class A Common Stock
Conversion of class B common stock to class A common stock, shares		2,500
Stock option exercised, shares	1,600	5,612
Cash dividends paid	$ 0.12	$ 0.12
Class B Common Stock
Cash dividends paid	$ 0.06	$ 0.06