Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net (Investments in Qualified Affordable Housing Partnerships, Net) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
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	$ 160,574		$ 162,824
Accrued expenses and other liabilities — Unfunded commitments	54,801		$ 55,815
Tax credits and other tax benefits recognized	9,155	$ 9,621
Amortization expense included in income tax expense	$ 7,073	$ 6,950