Quarterly report pursuant to Section 13 or 15(d)

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

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Available-for-Sale Securities, at Fair Value Nonconsolidated Variable Interest Entities (Details) - Mortgage-backed Securities, Issued by Private Enterprises [Member] - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Variable Interest Entity [Line Items]    
Assets of nonconsolidated Variable Interest Entities $ 3,600,000 $ 3,900,000
Maximum exposure to loss of nonconsolidated Variable Interest Entities $ 3,552,375 $ 3,867,572