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	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net [Abstract]
Minimum compliance period for qualified affordable housing partnerships to fully utilize the tax credits (in years)	15 years
Investments in qualified affordable housing partnerships, net	$ 197,470		$ 184,873
Accrued expenses and other liabilities — Unfunded commitments	83,769		$ 80,764
Tax credits and other tax benefits recognized	11,826	$ 9,155
Amortization expense included in income tax expense	$ 8,897	$ 7,073