Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities (Investments in Qualified Affordable Housing Partnerships, Net) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities [Abstract]
Minimum compliance period to fully utilize tax credits	15 years
Investments in qualified affordable housing partnerships, net	$ 184,873	$ 162,824
Accrued expenses and other liabilities — Unfunded commitments	80,764	55,815
Tax credits and other tax benefits recognized	39,262	46,698	$ 37,252
Amortization expense included in income tax expense	$ 28,046	$ 38,464	$ 28,206