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Investment Securities (Other-Than-Temporary Impairment Losses, Investment Securities) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Investment Securities [Abstract]      
Total other-than-temporary impairment losses, Held To Maturity $ 190 $ 93 $ 12,317
Total other-than-temporary impairment losses, Available For Sale     239
Portion of other-than-temporary impairment losses transferred from (recognized in) other comprehensive income, Held To Maturity 169 [1] 321 [1] (1,983) [1]
Net impairment losses recognized in earnings, Held to Maturity 359 [2] 414 [2] 10,334 [2]
Net impairment losses recognized in earnings     $ 239 [2]
[1] Represents other-than-temporary impairment losses related to all other factors.
[2] Represents other-than-temporary impairment losses related to credit losses.