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Loans and Investments - Summary of Impaired Loans (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) loan | Dec. 31, 2023 USD ($) loan
Loans and Investments |  |
UPB | $ 629,255 | $ 427,929
Carrying Value | 596,863 | 404,896
Allowance for Credit Losses | $ 145,749 | $ 120,611
Wtd. Avg. First Dollar LTV Ratio | 0 | 0
Wtd. Avg. Last Dollar LTV Ratio | 0.99 | 0.99
Number of impaired loans (less unearned revenue and other holdbacks and adjustments) by asset class | loan | 27 | 19
Multifamily |  |
Loans and Investments |  |
UPB | $ 473,820 | $ 272,494
Carrying Value | 452,237 | 260,291
Allowance for Credit Losses | $ 62,887 | $ 37,750
Wtd. Avg. First Dollar LTV Ratio | 0 | 0
Wtd. Avg. Last Dollar LTV Ratio | 0.99 | 1
Land |  |
Loans and Investments |  |
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 | 0.99 | 0.99
Retail |  |
Loans and Investments |  |
UPB | $ 19,520 | $ 19,520
Carrying Value | 15,058 | 15,037
Allowance for Credit Losses | $ 3,293 | $ 3,292
Wtd. Avg. First Dollar LTV Ratio | 0 | 0
Wtd. Avg. Last Dollar LTV Ratio | 0.88 | 0.88
Commercial |  |
Loans and Investments |  |
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 | 0 | 0
Wtd. Avg. Last Dollar LTV Ratio | 1 | 1

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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 Amount, excluding accrued interest, of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 19 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-19 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + 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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 19 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-19 + Details
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