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Basis of Presentation Basis of Presentation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Tax Credit Carryforward [Line Items]          
Income Tax Expense (Benefit) $ 10,328 $ 13,402 $ 36,007 $ 41,136  
Other Assets          
Tax Credit Carryforward [Line Items]          
Investments, low income housing 164,000   164,000   $ 155,600
LIH Low Income Housing          
Tax Credit Carryforward [Line Items]          
Income Tax Expense (Benefit) $ (2,300) $ (2,100) $ (7,100) $ (7,400)