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Loans Receivable - Schedule of Reserve for Loan Losses (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2022 USD ($) | Dec. 31, 2021 property | Dec. 31, 2021 USD ($) | Dec. 31, 2021 loan
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reserve for loan losses, beginning of period | $ 1,813 |  | $ 10,280 |
Provision for expected loan losses | 131 |  | 1,689 |
Expected loan losses related to loans sold and repaid | 0 |  | (10,156) |
Reserve for loan losses, end of period | 1,944 |  | 1,813 |
Number of loans sold |  | 6 |  | 2
Secured Loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reserve for loan losses, beginning of period | 1,804 |  | 3,152 |
Provision for expected loan losses | 134 |  | 793 |
Expected loan losses related to loans sold and repaid | 0 |  | (2,141) |
Reserve for loan losses, end of period | 1,938 |  | 1,804 |
Mezzanine and Other |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Reserve for loan losses, beginning of period | 9 |  | 7,128 |
Provision for expected loan losses | (3) |  | 896 |
Expected loan losses related to loans sold and repaid | 0 |  | (8,015) |
Reserve for loan losses, end of period | $ 6 |  | $ 9 |

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of decrease from sale and reclassification to held-for-sale of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 11 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919244-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of credit loss expense (reversal of expense) for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(11)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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