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Repurchase Agreements (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Assets Sold under Agreements to Repurchase, Repurchase Liability | $ 2,527,065 | $ 2,437,163 |
Weighted Average Rate | 0.20% | 0.34% |
Fair Value of Collateral Pledged (1) | $ 2,677,652 | $ 2,609,075 |
Payable for unsettled securities |  | 5 |
Receivable for sales pending settlement | 806 | 150,432 |
Repurchase agreement amount for which securities sold but unsettled as of reporting date are pledged as collateral. |  | 140,612 |
Amortized cost of securities sold but unsettled |  | 141,215 |
Residential Mortgage Backed Securities | Agency MBS |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Assets Sold under Agreements to Repurchase, Repurchase Liability | $ 2,069,312 | $ 1,874,176 |
Weighted Average Rate | 0.13% | 0.23% |
Fair Value of Collateral Pledged (1) | $ 2,166,848 | $ 1,973,608 | [1]
Commercial Mortgage Backed Securities | Agency MBS |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Assets Sold under Agreements to Repurchase, Repurchase Liability | $ 186,575 | $ 237,649 |
Weighted Average Rate | 0.13% | 0.23% |
Fair Value of Collateral Pledged (1) | $ 198,487 | $ 255,741 |
Interest-Only-Strip | Agency MBS |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Assets Sold under Agreements to Repurchase, Repurchase Liability | $ 180,425 | $ 209,393 |
Weighted Average Rate | 0.68% | 0.90% |
Fair Value of Collateral Pledged (1) | $ 203,319 | $ 243,042 |
Interest-Only-Strip | Non-Agency MBS |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |
Assets Sold under Agreements to Repurchase, Repurchase Liability | $ 90,753 | $ 115,945 |
Weighted Average Rate | 0.98% | 1.28% |
Fair Value of Collateral Pledged (1) | $ 108,998 | $ 136,684 |
[1] | The amounts for fair value of collateral pledged in the table above as of December 31, 2020 include securities with an amortized cost of $141,215 which were sold but not settled as of that date, and for which the proceeds of $150,432 are recorded within “receivable for sales pending settlement” on the consolidated balance sheet. These securities collateralized $140,612 of the Company’s repurchase agreement borrowings outstanding as of December 31, 2020.

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- Definition Repurchase agreement amount outstanding for which securities sold but not settled as of the reporting date are pledged as collateral. + References No definition available. + Details
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- Definition Amount payable to other broker-dealer and clearing organization, including, but not limited to, security failed-to-receive, deposit received for security loaned, open transaction, and floor-brokerage payable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + 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://fasb.org/us-gaap/role/ref/legacyRef -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=120395691&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://fasb.org/us-gaap/role/ref/legacyRef -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=120395691&loc=d3e23780-122690 + Details
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- Definition Amount receivable from broker-dealers and clearing organizations, including, but not limited to, securities failed-to-deliver, certain deposits for securities borrowed, open transactions, good faith and margin deposits, commissions and floor brokerage receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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