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Investments in Qualified Affordable Housing Projects (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Investment In Qualified Affordable Housing Projects.    
Tax Credits and Benefits $ 2.4 $ 2.0
Amortization 1.5 1.6
Carrying value 26.8 19.3
Original Investment Value 35.8  
Funding obligation $ 14.7 $ 5.7