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Loans Receivable - Schedule of Reserve for Loan Losses (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) property | Dec. 31, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Reserve for loan losses, beginning of period | $ 10,280 | $ 0
Cumulative-effect of adopting of ASU 2016-13 to beginning retained earnings | 0 | 1,420
Expected loan losses related to loans sold and repaid | (9,658) | (8,394)
Expected loan losses related to loans transferred to held for sale | (498) | 0
Provision for expected loan losses | 2,603 | 17,254
Reserve for loan losses, end of period | $ 2,727 | 10,280
Number of loans held for sale | property | 1 |
Secured Loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Reserve for loan losses, beginning of period | $ 3,152 | 0
Cumulative-effect of adopting of ASU 2016-13 to beginning retained earnings | 0 | 513
Expected loan losses related to loans sold and repaid | (1,643) | (259)
Expected loan losses related to loans transferred to held for sale | (498) | 0
Provision for expected loan losses | 1,702 | 2,898
Reserve for loan losses, end of period | 2,713 | 3,152
Mezzanine and Other |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Reserve for loan losses, beginning of period | 7,128 | 0
Cumulative-effect of adopting of ASU 2016-13 to beginning retained earnings | 0 | 907
Expected loan losses related to loans sold and repaid | (8,015) | (8,135)
Expected loan losses related to loans transferred to held for sale | 0 | 0
Provision for expected loan losses | 901 | 14,356
Reserve for loan losses, end of period | $ 14 | $ 7,128

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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) + Details
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