Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Net tax credits	$ 2,600	$ 1,100	$ 4,800
Benefit from operating loss carryforwards	400
Increase (decrease) in deferred income taxes	28,100
Deferred tax expense (benefit)	(4,998)	(31,236)	927
Tax benefit directly allocated to shareholder's equity	23,200
Valuation allowance	37,374	37,374
Unrecognized deferred tax liability for thrift bad-debt reserves	15,300
Cumulative taxable temporary differences	58,000
Unrecognized tax benefits that would impact effective tax rate	3,500	3,500	3,900
Interest and penalties	300	100
Accrued interest and penalties related to UTBs	1,900	$ 1,700
Research Tax Credit Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Net tax credits	500		3,000
Research Tax Credit Carryforward, Qualifying Technology Expenditures Incurred Before 2019
Operating Loss Carryforwards [Line Items]
Net tax credits			$ 2,400
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance	37,400
Deferred tax assets, net operating loss carryforwards subject to expiration	630,800
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax assets, operating loss carryforwards	1,100,000
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Decrease in unrecognized tax benefits reasonably possible	1,600
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Decrease in unrecognized tax benefits reasonably possible	$ 2,600