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Investment Securities (Other-Than-Temporary Impairment Losses, Investment Securities) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Investment Securities [Abstract]    
Total other-than-temporary impairment losses      
Portion of other-than-temporary impairment losses transferred from other comprehensive income    [1] 25 [1]
Net impairment losses recognized in earnings    [2] $ 25 [2]
[1] Represents other-than-temporary impairment losses related to all other factors.
[2] Represents other-than-temporary impairment losses related to credit losses.