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Loans and Investments - Summary of impaired loans (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) item | Dec. 31, 2021 USD ($) item
SCHEDULE IV |  |
UPB | $ 157,960 | $ 159,940
Carrying Value | 147,131 | 148,839
Allowance for Credit Losses | $ 85,386 | $ 86,886
Wtd. Avg. First Dollar LTV Ratio | 3 | 3
Wtd. Avg. Last Dollar LTV Ratio | 96 | 95
Number of impaired loans (less unearned revenue and other holdbacks and adjustments) by asset class | item | 7 | 8
Land |  |
SCHEDULE IV |  |
UPB | $ 134,215 | $ 134,215
Carrying Value | 127,868 | 127,868
Allowance for Credit Losses | $ 77,869 | $ 77,869
Wtd. Avg. First Dollar LTV Ratio | 0 | 0
Wtd. Avg. Last Dollar LTV Ratio | 99 | 99
Retail |  |
SCHEDULE IV |  |
UPB | $ 22,045 | $ 22,045
Carrying Value | 17,563 | 17,291
Allowance for Credit Losses | $ 5,817 | $ 5,817
Wtd. Avg. First Dollar LTV Ratio | 14 | 14
Wtd. Avg. Last Dollar LTV Ratio | 79 | 77
Office |  |
SCHEDULE IV |  |
UPB |  | $ 1,980
Carrying Value |  | 1,980
Allowance for Credit Losses |  | $ 1,500
Wtd. Avg. First Dollar LTV Ratio |  | 0
Wtd. Avg. Last Dollar LTV Ratio |  | 51
Commercial |  |
SCHEDULE IV |  |
UPB | $ 1,700 | $ 1,700
Carrying Value | 1,700 | 1,700
Allowance for Credit Losses | $ 1,700 | $ 1,700
Wtd. Avg. First Dollar LTV Ratio | 63 | 63
Wtd. Avg. Last Dollar LTV Ratio | 63 | 63

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- Definition Carrying value of impaired financing receivables. + References No definition available. + Details
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- Definition For an impaired loan, the weighted average loan to value ratio that is calculated by comparing the total of the carrying value of the company's loan and all senior lien positions within the capital stack to the fair value of the underlying collateral to determine the point at which the company will absorb a total loss of its position. + References No definition available. + Details
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- Definition For an impaired loan, the weighted average loan to value ratio that is calculated by comparing the total of the carrying value of the company's loan and all senior lien positions within the capital stack to the fair value of the underlying collateral to determine the point at which the company will initially absorb a loss. + References No definition available. + Details
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- Definition The number of impaired loans (less unearned revenue and other holdbacks and adjustments) by asset class. + References No definition available. + Details
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- Definition Amount of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 19 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919265-210447 + Details
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- Definition Amount at par value of financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 19 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919265-210447 + Details
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