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Investment in Qualified Affordable Housing Investment in Qualified Affordable Housing (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]          
Affordable housing tax credit investments $ 56,219   $ 56,219   $ 52,947
Amortization Method Qualified Affordable Housing Project Investments, Amortization 1,900 $ 1,800 3,700 $ 3,700  
Affordable Housing Program Obligation 21,282   21,282   $ 14,282
Affordable Housing Tax Credits and Other Tax Benefits, Amount $ 2,400 $ 2,300 $ 4,900 $ 4,700