Investment in Qualified Affordable Housing (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Amortization Method Qualified Affordable Housing Project Investments, Amortization	$ 1,800	$ 1,700	$ 3,700	$ 3,500
Affordable Housing Program Obligation	15,995		15,995		$ 20,311
Affordable Housing Tax Credits and Other Tax Benefits, Amount	2,300	$ 2,300	4,700	$ 4,500
Qualified Affordable Housing [Domain]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 47,576		$ 47,576		$ 51,247