Indemnification Assets (Carrying Value of Indemnification Assets and Receivables (Payables) to the FDIC) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Schedule of Estimated Fair Value and Range of Fair Value for Indemnification Assets [Line Items]
Total	$ 142,400,000	$ 341,400,000
IndyMac Transaction
Schedule of Estimated Fair Value and Range of Fair Value for Indemnification Assets [Line Items]
Loan indemnification	113,500,000	223,000,000
Reverse mortgage indemnification	0	10,400,000
Agency claims indemnification	28,900,000	108,000,000
Total	142,400,000	341,400,000
Receivable with the FDIC	9,200,000	$ 12,700,000
Decrease in carrying value of loan indemnification	109,500,000
Other adjustments	53,100,000
Increase in agency claims indemnification	56,400,000
Reverse mortgage indemnification released	$ 77,000,000