Quarterly report pursuant to Section 13 or 15(d)

Variable Interest Entities (Details)

v3.8.0.1
Variable Interest Entities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Variable Interest Entity [Line Items]    
Assets of consolidated Variable Interest Entities $ 3,094,462 $ 3,336,292
Liabilities of consolidated Variable Interest Entities 2,804,685 3,058,278
Assets of nonconsolidated Variable Interest Entities 2,644,723 1,902,384
Maximum exposure to loss of nonconsolidated Variable Interest Entities 2,644,723 1,902,384
Loans Held-for-Investment, Residential Mortgages [Member]    
Variable Interest Entity [Line Items]    
Assets of consolidated Variable Interest Entities 3,031,191 3,271,317
Commercial Real Estate Assets [Member]    
Variable Interest Entity [Line Items]    
Assets of consolidated Variable Interest Entities 45,889 45,885
Accrued Income Receivable [Member]    
Variable Interest Entity [Line Items]    
Assets of consolidated Variable Interest Entities 17,382 19,090
Assets, Total [Member]    
Variable Interest Entity [Line Items]    
Assets of consolidated Variable Interest Entities 3,094,462 3,336,292
Borrowings [Member]    
Variable Interest Entity [Line Items]    
Liabilities of consolidated Variable Interest Entities 2,785,413 3,037,196
Accrued Liabilities [Member]    
Variable Interest Entity [Line Items]    
Liabilities of consolidated Variable Interest Entities 7,894 8,708
Other Liabilities [Member]    
Variable Interest Entity [Line Items]    
Liabilities of consolidated Variable Interest Entities 11,378 12,374
Liabilities, Total [Member]    
Variable Interest Entity [Line Items]    
Liabilities of consolidated Variable Interest Entities $ 2,804,685 $ 3,058,278