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Income Taxes (Details 3)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Effective income tax rate reconciliation      
Statutory rate (as a percent) 35.00% 35.00% 35.00%
Net state income tax (as a percent) 6.20% 5.90% 5.10%
Tax exempt income (as a percent) (4.00%) (6.30%) (19.70%)
Affordable housing investments (as a percent) (5.00%) (7.20%) (21.00%)
FTB settlement and other adjustments (as a percent)   (9.50%)  
All other, net (as a percent) (1.60%) (1.70%) (3.20%)
Effective tax provision (benefit) (as a percent) 30.60% 16.20% (3.80%)