AFS Securities (Roll-forward of credit related impairment recognized in earnings) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Roll-forward of credit related impairment recognized in earnings      
Balance at beginning of period $ 282 $ 0 $ 0
Additions to credit losses for which no previous OTTI was recognized 0 282 0
Balance at end of period $ 282 $ 282 $ 0