Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 23,900
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	27,000	$ 21,300	$ 10,000
Other Tax Expense (Benefit)	800
Deferred State and Local Income Tax Expense (Benefit), Tax Law Changes	(2,000)	(2,400)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	1,400	3,200
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, net of tax	(1,800)	(2,300)	(300)
Amortization Method Qualified Affordable Housing Project Investments	59,000
Qualified Affordable Housing Project Investments, Commitment	52,000
Maximum Loss Exposure Amount, Affordable Housing VIEs	60,000
Discrete Income Tax Benefit	49,323
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	5,438	4,739	3,340
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	11,618	22,089	$ 0
State and Local Jurisdiction [Member]
Income Tax Disclosure [Line Items]
Operating Loss Carryforwards	110,500
Deferred Income Tax Benefit, Net Operating Loss Carryforward	900	$ 2,900
Internal Revenue Service (IRS) [Member]
Income Tax Disclosure [Line Items]
Operating Loss Carryforwards	$ 14,600