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Securities Sold Under Agreements To Repurchase (Securities Sold Under Agreements to Repurchase) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]    
Repurchase Amount $ 304,560 $ 313,321
Weighted Average Interest Rate 0.02% 0.04%
Carrying Value of Underlying Assets $ 402,003 $ 411,569
Market Value of Underlying Assets $ 402,003 $ 411,569