Investment in Qualified Affordable Housing (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Affordable housing tax credit investments	$ 51,083		$ 52,947
Amortization Method Qualified Affordable Housing Project Investments, Amortization	1,900	$ 1,800
Affordable Housing Program Obligation	14,282		$ 14,282
Affordable Housing Tax Credits and Other Tax Benefits, Amount	$ 2,400	$ 2,300