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Schedule IV - Mortgage Loans on Real Estate Footnotes (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2023
USD ($)
security_loan
Dec. 31, 2023
USD ($)
loan
Dec. 31, 2022
USD ($)
security_loan
Dec. 31, 2022
USD ($)
loan
Dec. 31, 2021
USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Tax basis of loans $ 23,500,000 $ 23,500,000      
CECL reserve 576,936 576,936 $ 326,137 $ 326,137 $ 124,679
Aggregate CECL Reserve $ 576,936 $ 576,936 $ 326,137 $ 326,137 124,679
Number of loans 178 178 203 203  
Principal balance $ 23,787,012 $ 23,787,012 $ 25,017,880 $ 25,017,880 22,003,017
Impaired loans          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
CECL reserve 417,670 417,670 189,778 189,778 $ 54,874
Principal balance 1,877,279 1,877,279 $ 929,111 $ 929,111  
Thirteen Loans | Impaired loans          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
CECL reserve 417,700 $ 417,700      
Number of loans | loan   13      
Level 3 | Fair Value, Nonrecurring          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
CECL reserve 417,700 $ 417,700      
Principal balance 1,900,000 1,900,000      
Hospitality Asset in New York City          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Aggregate CECL Reserve $ 417,700 $ 417,700