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Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
A roll-forward of the other-than-temporary impairment amount related to credit losses        
Balance of credit losses on debt securities for which a portion of other-than-temporary impairment was recognized in other comprehensive income, beginning of period $ 4,054 $ 4,054 $ 4,054 $ 3,656
Additional credit loss for which other-than-temporary impairment was not previously recognized 0 0 0 0
Additional credit loss for which other-than-temporary impairment was previously recognized 0 0 0 398
Balance of credit losses on debt securities for which a portion of other-than-temporary impairment was recognized in other comprehensive income, end of period $ 4,054 $ 4,054 $ 4,054 $ 4,054