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Secured Borrowings (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | $ 2,898,952 | $ 3,109,420 |
Secured borrowing, weighted average interest rate | 1.03% | 0.69% |
Fair Value of Collateral Pledged | $ 3,149,839 | $ 3,367,412 |
Weighted average maturity remaining | 20 days | 22 days |
Line of Credit Facility, Amount Outstanding | $ 329,424 |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 350,000 |  |
Line of Credit Facility, Interest Rate at Period End | 1.64% |  |
Securitization financing bond |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | $ 4,803 | $ 7,035 |
Secured borrowing, weighted average interest rate | 2.00% | 1.65% |
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements | $ 5,278 | $ 8,054 |
RMBS | Agency MBS |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | $ 1,157,302 | $ 1,439,436 |
Secured borrowing, weighted average interest rate | 0.82% | 0.47% |
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements | $ 1,191,147 | $ 1,483,152 |
RMBS | Non-Agency MBS |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | $ 26,149 | $ 52,128 |
Secured borrowing, weighted average interest rate | 1.98% | 1.77% |
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements | $ 31,952 | $ 64,286 |
CMBS | Agency MBS |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | $ 1,005,726 | $ 301,427 |
Secured borrowing, weighted average interest rate | 0.82% | 0.49% |
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements | $ 1,095,002 | $ 345,728 |
CMBS | Non-Agency MBS |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | $ 66,881 | $ 126,378 |
Secured borrowing, weighted average interest rate | 1.63% | 1.26% |
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements | $ 77,840 | $ 143,785 |
CMBS IO | Agency MBS |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | $ 346,892 | $ 360,245 |
Secured borrowing, weighted average interest rate | 1.57% | 1.24% |
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements | $ 407,481 | $ 421,285 |
CMBS IO | Non-Agency MBS |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | $ 291,199 | $ 302,771 |
Secured borrowing, weighted average interest rate | 1.67% | 1.33% |
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements | $ 341,139 | $ 359,351 |
Repurchase agreements |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | $ 2,898,952 | $ 2,589,420 |
Secured borrowing, weighted average interest rate | 1.03% | 0.75% |
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements | $ 3,149,839 | $ 2,825,641 |
Federal Home Loan Bank Advances [Member] |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | $ 0 | $ 520,000 |
Secured borrowing, weighted average interest rate | 0.00% | 0.40% |
Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank | $ 0 | $ 541,771 | [1]
[1] | FHLB advances were collateralized primarily with Agency CMBS as of December 31, 2015.

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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 The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for FHLB debt obligations, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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- Definition The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for repurchase agreements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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- Definition Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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