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Securities (Total OTTI) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]        
Gross change in OTTI recorded on certain investments $ 0 $ 0 $ 0 $ 84
Portion of OTTI recognized in OCI 0 0 0 84
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net $ 0 $ 0 $ 0 $ 0