Consolidated Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Operating Activities    
Net income $ 143,000,000 $ 125,000,000
Adjustments to reconcile net income to net cash used in operating activities:    
(Benefit) provision for loan losses (9,000,000) (18,000,000)
Representation and warranty (benefit) provision (12,000,000) (13,000,000)
Depreciation and amortization 24,000,000 17,000,000
Deferred income taxes 59,000,000 68,000,000
Net gain on loan and asset sales (257,000,000) (241,000,000)
Change in fair value and other non-cash changes (268,000,000) (231,000,000)
Proceeds from sales of loans held-for-sale (HFS) 14,097,000,000 15,247,000,000
Origination, premium paid and purchase of loans, net of principal repayments (23,826,000,000) (22,180,000,000)
Decrease (increase) in accrued interest receivable 1,000,000 (6,000,000)
(Increase) decrease in other assets, excluding purchase of other investments (104,000,000) 155,000,000
Increase in other liabilities 24,000,000 10,000,000
Net cash used in operating activities (10,128,000,000) (7,067,000,000)
Investing Activities    
Proceeds from sale of available for sale securities including loans that have been securitized 10,876,000,000 6,603,000,000
Collection of principal on investment securities available-for-sale (AFS) 116,000,000 185,000,000
Purchase of investment securities available-for-sale and other (203,000,000) (783,000,000)
Collection of principal on investment securities held-to-maturity (HTM) 126,000,000 38,000,000
Purchase of investment securities HTM (15,000,000) (10,000,000)
Proceeds received from the sale of held-for-investment loans (HFI) 228,000,000 788,000,000
Origination and purchase of loans HFI, net of principal repayments (1,297,000,000) (2,249,000,000)
Purchase of bank owned life insurance (85,000,000) (175,000,000)
Proceeds from the disposition of repossessed assets 14,000,000 19,000,000
Net (purchase) redemption of Federal Home Loan Bank stock (2,000,000) 42,000,000
Acquisitions of premises and equipment, net of proceeds (44,000,000) (28,000,000)
Proceeds from the sale of mortgage servicing rights 35,000,000 183,000,000
Net cash provided by investing activities 9,749,000,000 4,613,000,000
Financing Activities    
Net increase in deposit accounts 1,436,000,000 1,068,000,000
Net change in short-term FHLB borrowings and other short-term debt (1,211,000,000) 0
Proceeds from long-term Federal Home Loan Bank advances and other debt 395,000,000 22,235,000,000
Repayment of long-term Federal Home Loan Bank advances 0 (20,725,000,000)
Repayment of long-term debt 0 (55,000,000)
Net receipt (disbursement) of payments of loans serviced for others 91,000,000 (23,000,000)
Preferred stock dividends (105,000,000) 0
Redemption of preferred stock (267,000,000) 0
Net receipt of escrow payments 6,000,000 13,000,000
Net cash provided by financing activities 345,000,000 2,513,000,000
Net (decrease) increase in cash and cash equivalents (34,000,000) 59,000,000
Beginning cash and cash equivalents 208,000,000 136,000,000
Ending cash and cash equivalents 174,000,000 195,000,000
Supplemental disclosure of cash flow information    
Interest paid on deposits and other borrowings 89,000,000 42,000,000
Income tax payments 3,000,000 3,000,000
Non-cash reclassification of investment securities AFS to HTM 0 1,136,000,000
Non-cash reclassification of loans originated HFI to loans HFS 1,331,000,000 1,113,000,000
Non-cash reclassification of mortgage loans originated HFS to HFI 2,000,000 30,000,000
Non-cash reclassification of mortgage loans HFS to AFS securities 10,588,000,000 6,617,000,000
Mortgage servicing rights resulting from sale or securitization of loans 173,000,000 220,000,000
Non-cash reclassification of loans with government guarantee to other assets $ 0 $ 373,000,000