Quarterly report pursuant to Section 13 or 15(d)

Variable Interest Entities (Details)

v3.7.0.1
Variable Interest Entities (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets $ 3,246,363 $ 3,336,292
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities 2,962,598 3,058,278
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets 2,198,812 1,902,384
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 2,198,812 1,902,384
Loans Held-for-Investment, Residential Mortgages [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 3,181,811 3,271,317
Commercial Real Estate Assets [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 45,886 45,885
Accrued Income Receivable [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 18,666 19,090
Assets, Total [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 3,246,363 3,336,292
Borrowings [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities 2,941,990 3,037,196
Accrued Liabilities [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities 8,370 8,708
Accounts Payable [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities 12,238 12,374
Liabilities, Total [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities $ 2,962,598 $ 3,058,278