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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details) $ in Thousands, € in Millions, £ in Millions |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2022 USD ($) | May 24, 2021 USD ($) | Mar. 31, 2023 USD ($) loan extension | Mar. 31, 2023 GBP (£) loan extension | Dec. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 31, 2023 GBP (£) loan | Mar. 31, 2023 EUR (€) loan | Sep. 30, 2022 loan
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  | 100.00% | 100.00% |  |  |  |  |  | 100.00% |  |  |  |
Interest receivable |  |  |  | $ 65,738 |  | $ 65,383 |  |  |  |  | $ 65,383 |  |  |  |
General CECL (allowance) reversal |  |  |  | 4,400 |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  |  |  | 398,200 |  | 468,000 |  |  |  |  | 468,000 |  |  |  |
Interest received for loans in cost recovery |  |  |  | $ 700 |  |  |  | $ 200 |  |  |  |  |  |  |
Number of loans | loan |  |  |  | 3 |  |  |  |  |  |  |  |  | 3 | 3 |
Total carrying value, net |  |  |  | $ 8,472,068 |  | 8,681,990 |  |  |  |  | 8,681,990 |  |  |  |
Decrease in Specific CECL Allowance, net |  |  | $ 10,000 |  |  |  | $ (10,000) |  | $ 20,000 |  |  |  |  |  |
Allowance for credit loss, current |  |  |  |  |  |  | $ 7,000 |  |  |  |  |  |  |  |
Number of extensions available | extension |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |
Off-balance sheet, credit loss, liability |  | $ 3,928 |  | $ 4,695 |  | 4,347 |  | 3,928 |  |  | 4,347 | $ 3,106 |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest |  |  |  | 133,500 |  | 133,500 |  |  |  |  | 133,500 |  |  |  |
Financing receivable, loan specific, realized gain (loss) on writeoff |  |  |  |  |  |  |  |  |  |  | (7,000) |  |  |  |
Payment in kind interest |  |  |  |  |  |  |  | 1,200 |  |  |  |  |  |  |
Proceeds from pre-payment penalties or accelerated fees |  |  |  |  |  |  |  | 2,100 |  |  |  |  |  |  |
Debt instrument, amortized cost basis |  |  |  | 25,100 |  |  |  |  |  |  |  |  | £ 20.8 |  |
Proceeds received from the repayment and sale of commercial mortgage loans |  |  |  | 435,442 |  |  |  | 637,512 |  |  |  |  |  |  |
Office - London UK |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from collection of loans receivable |  |  |  | 88,400 | £ 72.2 |  |  |  |  |  |  |  |  |  |
Proceeds from interest received |  |  |  | 700 |  |  |  |  |  |  |  |  |  |  |
Hotel Through a Died-in-Lieu Foreclosure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, loan specific, realized gain (loss) on writeoff |  |  |  | (4,800) |  |  |  |  |  |  |  |  |  |  |
Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net | [1],[2] |  |  | 592,863 |  | 560,881 |  |  |  |  | 560,881 |  |  |  |
Specific CECL Allowance |  |  |  | 194,323 |  | 191,608 |  |  |  |  | 191,608 |  |  |  |
Maximum exposure to loss |  |  |  | $ 51,100 |  | 51,100 |  |  |  |  | $ 51,100 |  |  |  |
Maximum exposure to loss, term |  |  |  | 1 year 2 months 12 days | 1 year 2 months 12 days |  |  |  |  |  | 1 year 4 months 24 days |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  | $ 134,700 |  | 138,300 |  |  |  |  | $ 138,300 |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest |  | 175,000 |  | 133,500 |  | 133,500 |  | 175,000 |  |  | 133,500 | 145,000 |  |  |
Realized loss on investments |  |  |  |  |  |  |  |  |  |  |  | $ 20,000 |  |  |
Specific CECL Allowance |  |  |  | $ 8,502,335 |  | 8,708,214 |  |  |  |  | $ 8,708,214 |  |  |  |
Number of commercial mortgage loans | loan |  |  |  | 3 | 3 |  |  |  |  |  |  |  |  |  |
Loans and leases receivable, gain (loss) on sales, net |  |  |  | $ 200 |  |  |  |  |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment | Mixed Use Property - London |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net | £ |  |  |  |  |  |  |  |  |  |  |  |  | £ 15.0 |  |
Proceeds received from the repayment and sale of commercial mortgage loans |  |  |  | 18,200 | £ 15.0 |  |  |  |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment | Various Properties In Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  | 219,000 |  |  |  |  |  |  |  |  |  | € 205.7 |
Mortgage loans on real estate, commercial and consumer, funded, net |  |  |  | 122,400 |  |  |  |  |  |  |  |  |  | € 115.0 |
Past Due 90 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  | 581,300 |  | $ 398,200 |  |  |  | $ 581,300 |  |  |  |  |  |  |
Floating Rate Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  | 99.00% | 99.00% |  |  |  |  |  | 98.00% |  |  |  |
Senior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  | $ 194,300 |  |  |  |  |  |  |  |  |  |  |
Senior Mezzanine Loans | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, basis spread on variable rate |  |  |  | 15.70% |  |  |  |  |  |  |  |  | 15.70% | 15.70% |
Senior Mezzanine Loans | Secured Overnight Financing Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, basis spread on variable rate |  |  |  | 9.00% |  |  |  |  |  |  |  |  | 9.00% | 9.00% |
Junior Mezzanine A Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  | $ 283,800 |  |  |  |  |  |  |  |  |  |  |
Junior Mezzanine A Loan | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, basis spread on variable rate |  |  |  | 22.50% |  |  |  |  |  |  |  |  | 22.50% | 22.50% |
Junior Mezzanine A Loan | Secured Overnight Financing Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, basis spread on variable rate |  |  |  | 15.00% |  |  |  |  |  |  |  |  | 15.00% | 15.00% |
Junior Mezzanine B Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  | $ 15,500 |  | 15,500 |  |  |  |  | $ 15,500 |  |  |  |
Decrease in Specific CECL Allowance, net |  | $ 30,000 |  | $ 66,500 |  | 36,500 |  |  |  |  |  |  |  |  |
Junior Mezzanine B Loan | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, basis spread on variable rate |  |  |  | 17.50% |  |  |  |  |  |  |  |  | 17.50% | 17.50% |
Junior Mezzanine B Loan | Secured Overnight Financing Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, basis spread on variable rate |  |  |  | 15.00% |  |  |  |  |  |  |  |  | 15.00% | 15.00% |
Senior and Junior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  | 5.80% | 5.80% |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  | $ 493,600 |  |  |  |  |  |  |  |  |  |  |
Unfunded Loan Commitment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Off-balance sheet, credit loss, liability |  |  |  | 500 |  | $ 9,500 |  |  |  |  | $ 9,500 |  |  |  |
Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  |  |  | 15,480 |  |  |  |  |  |  |  |  |  |  |
Number of loans | loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3
Total carrying value, net |  |  |  | 743,900 |  |  |  |  |  |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest |  |  |  | 66,500 |  |  |  |  |  |  |  |  |  |  |
Payment in kind interest |  |  |  | 82,500 |  |  |  |  |  |  |  |  |  |  |
Mezzanine Loans | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in Specific CECL Allowance, net |  |  |  |  |  |  |  |  |  | $ 10,000 |  |  |  |  |
Senior Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  | $ 250,300 |  |  |  |  |  |  |  |  |  |  |
[1] | Includes $194,323 and $191,608 pledged as collateral under secured debt arrangements in 2023 and 2022, respectively.
[2] | Net of $163,767 and $159,724 CECL Allowance in 2023 and 2022, respectively, comprised of $133,500 and $133,500 Specific CECL Allowance and $30,267 and $26,224 General CECL Allowance, respectively.

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