Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, State and Local tax expense (benefit)		$ (47,500)
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, State and Local tax expense (benefit), net		(37,500)
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Federal tax increase related to DTA valuation allowance		10,000
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional SALT DTA benefits		(1,800)
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, DTA measurement Adjustments		31,500
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Federal tax increase related to DTA valuation and SALT Adj		10,600
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional SALT and DTA benefits gross		(39,300)
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Federal income tax (benefit)		20,900
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional DTA SALT DTA valuation net benefit 2		(28,700)
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Tax benefit, net		(7,800)
Operating loss carryforwards		25,100	$ 0	$ 3,000
Net tax credits		$ 1,600	$ 1,000	$ 2,100
Income tax expense at federal statutory rate, Percent		35.00%	35.00%	35.00%
Increase (decrease) in deferred income taxes		$ 8,200
Deferred tax (benefit) expense		(9,074)	$ 17,700	$ (15,513)
Valuation allowance		38,292	71,474
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration		400
Valuation allowance increase (decrease)		(33,200)
Net operating loss and credit carry forwards		71,813	64,644
Unrecognized deferred tax liability for thrift bad-debt reserves		14,900
Cumulative taxable temporary differences		58,000
Unrecognized tax benefits that would impact effective tax rate		2,800	2,500	3,300
Interest and penalties		200	(200)	$ 1,100
Accrued interest and penalties related to UTBs		1,900	$ 1,700
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance		38,200
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration		644,000
Capital Loss Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance		100
Change in the estimated realizability of SALT DTAs in future years [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance increase (decrease)		27,000
Estimated utilization and expiration of capital loss carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance increase (decrease)		3,500
estimated utilization of capital loss carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance increase (decrease)		2,100
Estimated expiration of capital loss carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance increase (decrease)		1,400
Decrease in State and Local net DTAs [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance increase (decrease)		2,700
Connecticut [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss and credit carry forwards		1,200,000
Tax credit carryforwards		800
Minimum [Member] | Forecast [Member]
Operating Loss Carryforwards [Line Items]
Decrease in UTBs	$ 600
Maximum [Member] | Forecast [Member]
Operating Loss Carryforwards [Line Items]
Decrease in UTBs	$ 1,800
Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		1,100
Shareholders' Equity [Member]
Operating Loss Carryforwards [Line Items]
Increase (decrease) in deferred income taxes		$ 700