Disclosures Regarding Fair Values Of Financial Instruments (Securities In An Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Disclosures Regarding Fair Values Of Financial Instruments [Abstract]
One year or greater, Fair Value	$ 4,933	$ 1,694
Less than one year, Fair Value	369,226	334,224
Fair Value, Total	374,159	335,918
One year or greater, Unrealized Loss	26	2
Less than one year, Unrealized Loss	1,275	1,315
Unrealized Loss, Total	$ 1,301	$ 1,317

This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized neither as held-to-maturity nor trading securities.

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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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- Definition

This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for those securities which are categorized neither as held-to-maturity nor trading securities.

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

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- Definition

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