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Income Taxes (Components Of Income Tax Expense Recorded Directly To Stockholders Equity) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]      
Unrealized gain on securities available for sale $ 31,565 $ 9,841 $ 61,701
Compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes (1,065) (1,201) (557)
Accumulated pension (benefit) loss (2,641) 327 1,476
Income tax expense allocated to stockholders' equity $ 27,859 $ 8,967 $ 62,620