Quarterly report pursuant to Section 13 or 15(d)

Available-for-Sale Securities, at Fair Value Nonconsolidated Variable Interest Entities (Details)

v3.10.0.1
Available-for-Sale Securities, at Fair Value Nonconsolidated Variable Interest Entities (Details) - Mortgage-backed Securities, Issued by Private Enterprises [Member] - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Variable Interest Entity [Line Items]    
Assets of nonconsolidated Variable Interest Entities $ 3,504,363 $ 2,982,094
Maximum exposure to loss of nonconsolidated Variable Interest Entities $ 3,504,363 $ 2,982,094