Variable Interest Entities - Summary of the Impact of Qualifying LIHTC Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Low income housing tax credits
Variable Interest Entity [Line Items]
Amortization of qualifying LIHTC investments	$ 4,436	$ 1,547	$ 12,721	$ 6,094
Affordable Housing Tax Credits and Other Tax Benefits	(3,607)	(2,584)	(10,758)	(7,681)
Other tax benefits related to qualifying LIHTC investments
Variable Interest Entity [Line Items]
Affordable Housing Tax Credits and Other Tax Benefits	$ (1,751)	$ (1,412)	$ (4,970)	$ (2,996)