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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 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	$ 152,556		$ 152,556		$ 162,824
Accrued expenses and other liabilities — Unfunded commitments	52,110		52,110		$ 55,815
Tax credits and other tax benefits recognized	8,940	$ 9,566	18,095	$ 19,187
Amortization expense included in income tax expense	$ 6,700	$ 7,051	$ 13,773	$ 14,001