Income Taxes (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
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	6	$ 6
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	2	3
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	(1)	$ 1
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating tax loss carryforwards	179
Operating tax loss carryforwards from acquisitions	$ 32