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Investment Securities (Other-than-Temporary Impairment Losses, Investment Securities) (Details) (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Investment Securities        
Total other-than-temporary impairment losses $ 110   $ 110 $ 5
Portion of other-than-temporary impairment losses transferred from (recognized in) other comprehensive income (63) [1]   [1] (38) [1] 284 [1]
Net impairment losses recognized in earnings $ 47 [2]   [2] $ 72 [2] $ 289 [2]
[1] Represents other-than-temporary impairment losses related to all other factors.
[2] Represents other-than-temporary impairment losses related to credit losses.