Consolidated Statements of Changes In Stockholders' Equity (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Other comprehensive income, net of tax:
Taxes on Unrealized holding losses	$ 2,098	$ 1,527
Net realized gains on Unrealized holding losses	362	378
Taxes on Pension liabilities adjustments	126	81
Stock option excercised, shares	350
Additional Paid-In Capital
Other comprehensive income, net of tax:
Stock option excercised, shares	350
Class A Common Stock | Retained Earnings
Other comprehensive income, net of tax:
Cash dividends paid	$ 0.24	$ 0.24
Class B Common Stock | Retained Earnings
Other comprehensive income, net of tax:
Cash dividends paid	$ 0.12	$ 0.12
Accumulated Other Comprehensive Income (Loss)
Other comprehensive income, net of tax:
Taxes on Unrealized holding losses	2,098	1,527
Net realized gains on Unrealized holding losses	362	378
Taxes on Pension liabilities adjustments	$ 126	$ 81
Class A Common Stock
Other comprehensive income, net of tax:
Conversion of class B common stock to class A common stock, shares	14,500	3,150
Stock option excercised, shares	350
Cash dividends paid	$ 0.24	$ 0.24
Class B Common Stock
Other comprehensive income, net of tax:
Conversion of class B common stock to class A common stock, shares	14,500	3,150
Cash dividends paid	$ 0.12	$ 0.12