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Subsequent Events (Details) £ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Feb. 09, 2021 USD ($) | Feb. 09, 2021 GBP (£) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Subsequent Event [Line Items] |  |  |  |  |
Commercial mortgage loans, net |  |  |  | $ 6,496,977,000 | $ 6,375,093,000
Commercial Mortgage Portfolio Segment |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Commercial mortgage loans, net | [1],[2] |  |  | $ 5,451,084,000 | $ 5,326,967,000
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Funded amount of mortgages |  | $ 43,200,000 |  |  |
Proceeds from loan repayments |  | 6,700,000 |  |  |
Increase authorized repurchase amount |  | 150,000,000.0 |  |  |
Authorized amount |  | 300,000,000.0 |  |  |
Remaining authorized repurchase amount |  | 172,300,000 |  |  |
Subsequent Event | Commercial Mortgage Portfolio Segment |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Investment in mortgage loans on real estate, face amount of mortgages |  | 226,200,000 | £ 165.0 |  |
Commercial mortgage loans, net |  | $ 2,500,000,000 | £ 1,800.0 |  |
[1] | Includes $5,418,999 and $4,852,087 pledged as collateral under secured debt arrangements in 2020 and 2019, respectively
[2] | Net of $213,102 CECL Allowances in 2020, comprised of $175,000 Specific CECL Allowance and $38,102 General CECL Allowance. Net of $56,981 provision for loan loss in 2019.

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- Definition Amount of contractual principal due at origination of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column F -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column F)) -URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014 + Details
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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition The cash inflow from repayments of the balance excluding interest (principal) on loans receivable and leases held for investment purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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