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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Investments in Qualified Affordable Housing Partnerships, 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	$ 190,000		$ 190,000		$ 184,873
Accrued expenses and other liabilities — Unfunded commitments	66,213		66,213		$ 80,764
Tax credits and other tax benefits recognized	11,539	$ 9,425	34,871	$ 27,520
Amortization expense included in income tax expense	$ 8,452	$ 7,236	$ 27,006	$ 21,009