Securities - OTTI Significant Assumptions (Details) - Non-agency residential	Jun. 30, 2016
Weighted Average
Significant Assumptions:
Annual prepayment speed	12.70%
Loss severity	31.30%
Life default rate	20.50%
Weighted Average \| Prime
Significant Assumptions:
Loss severity	26.00%
Life default rate	15.30%
Weighted Average \| Alt-A Loan
Significant Assumptions:
Loss severity	27.60%
Life default rate	23.30%
Weighted Average \| Subprime
Significant Assumptions:
Loss severity	38.90%
Life default rate	23.20%
10th Percentile
Significant Assumptions:
Annual prepayment speed	1.90%
Loss severity	15.50%
Life default rate	0.60%
90th Percentile
Significant Assumptions:
Annual prepayment speed	27.30%
Loss severity	29.10%
Life default rate	78.30%