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Securities Credit Impaired Debt Securities (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
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 $ 3,276 $ 2,938 $ 4,570
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment 0 0 1,160
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses 130 338 58
Other Than Temporary Impairment Credit Losses Recognized In Earnings, Reductions, Securities Sold (2,149) 0 (975)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status 0 0 (1,875)
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held $ 1,257 $ 3,276 $ 2,938