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Securities Sold Under Agreements To Repurchase (Securities Sold Under Agreements To Repurchase) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Securities Sold Under Agreements To Repurchase [Abstract]
Repurchase Amount	$ 124,605	$ 73,759
Weighted average interest rate	0.35%	0.66%
Carrying value of underlying assets repurchase agreements	129,810	75,305
Market value of underlying assets repurchase agreements	$ 129,810	$ 75,305

The carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos.

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