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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 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	$ 198,466		$ 198,466		$ 184,873
Accrued expenses and other liabilities — Unfunded commitments	83,785		83,785		$ 80,764
Tax credits and other tax benefits recognized	11,506	$ 8,940	23,332	$ 18,095
Amortization expense included in income tax expense	$ 9,657	$ 6,700	$ 18,554	$ 13,773