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Investment in Qualified Affordable Housing (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]          
Amortization Method Qualified Affordable Housing Project Investments, Amortization $ 1,800 $ 1,700 $ 5,500 $ 5,200  
Affordable Housing Program Obligation 24,756   24,756   $ 20,311
Affordable Housing Tax Credits and Other Tax Benefits, Amount 2,300 $ 2,300 7,000 $ 6,800  
Qualified Affordable Housing [Domain]          
Schedule of Equity Method Investments [Line Items]          
Equity Method Investments $ 54,757   $ 54,757   $ 51,247