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Securities Credit Impaired Debt Securities (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Changes in the credit loss component of credit-impaired debt securities        
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held $ 0 $ 1,257 $ 0 $ 1,257
Other Than Temporary Impairment Credit Losses Recognized In Earnings, Reductions, Securities Fully Written Down And Deemed Worthless 0 500 0 500
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held $ 0 $ 757 $ 0 $ 757