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Repurchase Agreements (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Balance |  | $ 2,565,902 | $ 2,898,952
Weighted Average Rate |  | 1.67% | 1.03%
Fair Value of Collateral Pledged |  | $ 2,765,099 | $ 3,149,839
Payable for unsettled securities |  | 156,899 | 0
Securitization financing bond |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Balance |  | $ 0 | $ 4,803
Weighted Average Rate |  | 0.00% | 2.00%
Fair Value of Collateral Pledged |  | $ 0 | $ 5,278
RMBS | Agency MBS |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Balance |  | $ 836,281 | $ 1,157,302
Weighted Average Rate |  | 1.47% | 0.82%
Fair Value of Collateral Pledged |  | $ 867,120 | $ 1,191,147
Payable for unsettled securities |  | 156,899 |
Securities, purchases pending settlement | [1] | 156,551 |
RMBS | Non-Agency MBS |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Balance |  | $ 0 | $ 26,149
Weighted Average Rate |  | 0.00% | 1.98%
Fair Value of Collateral Pledged |  | $ 0 | $ 31,952
CMBS | Agency MBS |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Balance |  | $ 1,003,146 | $ 1,005,726
Weighted Average Rate |  | 1.44% | 0.82%
Fair Value of Collateral Pledged |  | $ 1,071,904 | $ 1,095,002
CMBS | Non-Agency MBS |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Balance |  | $ 15,508 | $ 66,881
Weighted Average Rate |  | 2.47% | 1.63%
Fair Value of Collateral Pledged |  | $ 18,212 | $ 77,840
CMBS IO | Agency MBS |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Balance |  | $ 324,163 | $ 346,892
Weighted Average Rate |  | 2.17% | 1.57%
Fair Value of Collateral Pledged |  | $ 372,077 | $ 407,481
CMBS IO | Non-Agency MBS |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Balance |  | $ 263,694 | $ 291,199
Weighted Average Rate |  | 2.43% | 1.67%
Fair Value of Collateral Pledged |  | $ 311,571 | $ 341,139
U.S. Treasuries |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Balance |  | $ 123,110 | $ 0
Weighted Average Rate |  | 1.85% | 0.00%
Fair Value of Collateral Pledged |  | $ 124,215 | $ 0
[1] | Includes purchased securities pending settlement.

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- Definition Par including premium (discount) of available-for-sale securities purchased but not settled prior to end of reporting period. + References No definition available. + Details
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- Definition Carrying amount of assets sold under agreements to repurchase when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under repurchase agreements exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Interest rate on the amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount payable to broker-dealers and clearing organizations, including, but not limited to, securities failed-to-receive, certain deposits received for securities loaned, open transactions, and floor-brokerage payables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35710130&loc=d3e41645-110958 + Details
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