Income Taxes (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Taxes (Textuals) [Abstract]
Bad debt from acquired savings banks	$ 100
Deferred tax on bad debt from acquired savings banks	40
Unrecognized tax benefit impact on effective tax rate	7	$ 6
Interest and penalty expense (benefit)	0	(1)
Accrued interest and penalties	2	2
Operating Loss Carryforwards [Line Items]
Valuation allowance for deferred tax assets	0	$ 0
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating tax loss carryforwards	100
Operating tax loss carryforwards from acquisitions	$ 16