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Short-Term Debt - Collateral for Short-Term Debt Facilities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Short-term Debt [Line Items] |  |
Total collateral for financing | $ 1,450,138 | $ 649,106
Facilities |  |
Short-term Debt [Line Items] |  |
Total real estate securities owned | 108,784 | 114,553
Other assets | 17,381 | 315
Total collateral for financing | 1,217,070 | 398,252
Servicer advance financing |  |
Short-term Debt [Line Items] |  |
Total collateral for financing | 233,068 | 250,854
Cash | 10,698 | 9,978
Restricted cash | 29,518 | 23,220
Servicer advances | 192,852 | 217,656
Held-for-sale residential loans | Facilities |  |
Short-term Debt [Line Items] |  |
Market value of loans pledged as collateral under short-term borrowing agreements | 926,076 | 156,355
Business purpose loans | Facilities |  |
Short-term Debt [Line Items] |  |
Market value of loans pledged as collateral under short-term borrowing agreements | 164,829 | 127,029
On balance sheet | Facilities |  |
Short-term Debt [Line Items] |  |
Available-for-sale securities pledged as collateral | 16,611 | 23,193
Sequoia Choice | Sequoia securities | Short Term Borrowing Agreement | Facilities |  |
Short-term Debt [Line Items] |  |
Trading securities pledged as collateral | 63,194 | 63,105
Freddie Mac K-Series | Sequoia securities | Short Term Borrowing Agreement | Facilities |  |
Short-term Debt [Line Items] |  |
Trading securities pledged as collateral | $ 28,979 | $ 28,255

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- Definition Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.1) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),2) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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