Secured Borrowings Secured Borrowings, Counterparty Information (Details) $ in Thousands	Jun. 30, 2016 USD ($) Agreements
Counterparty Information [Line Items]
Line of Credit Facility, Amount Outstanding	$ 267,866
Line of Credit Facility, Maximum Borrowing Capacity	$ 350,000
Line of Credit Facility, Interest Rate at Period End	1.34%
Number of Counterparties with Borrowings Outstanding | Agreements	19
Available Repurchase Agreement Counterparties | Agreements	32
Wells Fargo Bank, N. A. and affiliates
Counterparty Information [Line Items]
Repurchase Agreement Counterparty, Amount at Risk	$ 52,582
Borrowings outstanding with counterparty	$ 281,421
WAVG interest rate for amount outstanding with named counterparty	1.34%