Variable Interest Entities - Summary of the Impact of Qualifying LIHTC Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Low income housing tax credits
Variable Interest Entity [Line Items]
Amortization of qualifying LIHTC investments	$ 4,287	$ 2,191	$ 8,285	$ 4,547
Affordable Housing Tax Credits and Other Tax Benefits	(3,522)	(2,560)	(7,151)	(5,097)
Other tax benefits related to qualifying LIHTC investments
Variable Interest Entity [Line Items]
Affordable Housing Tax Credits and Other Tax Benefits	$ (1,609)	$ (894)	$ (3,219)	$ (1,584)