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Loans and Investments - Loan Modifications (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) loan | Mar. 31, 2024 USD ($) loan | Dec. 31, 2023 USD ($) loan | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) loan | Dec. 31, 2023 USD ($) loan
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Loans and investments, gross |  | $ 11,873,208 |  | $ 12,615,006 |  | $ 11,873,208 | $ 12,615,006
New borrower investments |  | $ 4,900 | $ 2,000 |  |  |  |
Number of impaired loans (less unearned revenue and other holdbacks and adjustments) by asset class | loan |  | 25 |  | 19 |  | 25 | 19
Interest reserve |  |  |  |  |  | $ 185,400 | $ 156,100
Future funding commitments, modified loans, borrowers experiencing financial difficulty |  | $ 43,800 |  |  |  | $ 43,800 |
Loan modification, refinancing, and extensions | loan |  | 0 |  |  |  | 0 | 0
Secondary Loan |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Financing receivable, net of reserve |  | $ 4,400 |  |  |  | $ 4,400 |
Loans modified in period, floor interest rate spread |  | 0.0375 |  |  |  |  |
Senior Lien |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Financing receivable, basis spread on variable rate |  | 0.0050 |  |  |  | 0.0050 |
Financing receivable, floor interest rate |  | 0.0600 |  |  |  |  |
Loans modified in period, floor interest rate spread |  | 0.0325 |  |  |  |  |
Senior Lien | Senior Position Loan |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Financing receivable, net of reserve |  | $ 32,000 |  |  |  | $ 32,000 |
Financial Asset, 60 Days Past Due |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Loans and investments, gross |  | $ 36,400 |  |  |  | $ 36,400 |
Financing receivable, specific reserve |  |  |  | $ 5,000 |  |  |
Financing receivable, net of reserve |  |  |  | $ 31,400 |  |  | $ 31,400
Temporary Interest Rate Relief |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Number of loans modified not pursuant to contract | loan |  | 2 | 4 | 2 |  | 2 | 2
Loans modified, not pursuant to contract, amount |  | $ 66,800 | $ 122,300 |  |  |  | $ 55,500
Loan loss reserves related to VIEs |  |  |  | $ 14,000 |  |  | 14,000
Bridge loans |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Variable rate, spread |  |  |  |  | 3.40% |  |
Financing receivable, accrual rate | 0.0300 |  |  |  |  |  |
Loans and investments, gross |  | $ 11,478,252 | 13,500 | 12,273,244 | $ 70,500 | $ 11,478,252 | 12,273,244
Financing receivable, specific reserve |  |  | $ 1,500 |  |  |  |
Loans modified in period, floor interest rate spread |  |  | 0.0415 |  |  |  |
Fixed interest rate, first twenty four months |  |  | 0.0825 |  |  |  |
Fixed interest rate, last twelve months |  |  | 0.0850 |  |  |  |
Financing receivable, fixed interest rate | 0.0300 |  |  |  |  |  |
Financing receivable, total fixed rate | 0.0600 |  |  |  |  |  |
Financing receivable, total fixed rate, period | 18 months |  |  |  |  |  |
Financing receivable, borrower required funding | $ 10,500 |  |  |  |  |  |
Interest reserve | 2,500 |  |  |  |  |  |
Financing receivable, borrower requirement, capital improvements | $ 8,000 |  |  |  |  |  |
Financing receivable, borrower requirement, capital improvements, period | 15 months |  |  |  |  |  |
Bridge loans | Loan Reduction |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Loans and investments, gross |  |  | $ 12,500 |  |  |  |
Multifamily | Bridge loans |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Number of financing receivables modified during the period | loan |  |  | 16 |  |  |  |
Financing receivable, amount modified in period |  |  | $ 692,800 |  |  |  |
Weighted average pay rate |  | 0.0730 | 0.0695 |  |  |  |
Financing receivable, accrual rate |  | 0.0204 | 0.0186 |  |  |  |
Loans previously classified as non-performing |  |  | $ 712,900 |  |  |  |
Multifamily | Bridge loans | Financial Asset, Less Than 60 Days Past Due |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Loans previously classified as non-performing |  | $ 92,700 |  |  |  | 92,700 |
Multifamily | Bridge loans | Greater Than 60 Days Past Due |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Loans previously classified as non-performing |  | $ 12,200 |  |  |  | $ 12,200 |
Multifamily | Bridge loans | Minimum |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Variable rate, spread |  | 3.25% | 3.25% |  |  |  |
Multifamily | Bridge loans | Maximum |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Variable rate, spread |  | 5.25% | 4.25% |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief And Extended Maturity |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Number of financing receivables modified during the period | loan |  | 14 |  |  |  |  |
Financing receivable, amount modified in period |  | $ 291,900 | $ 671,000 |  |  |  |
Number of financing receivables with extended maturities | loan |  | 12 | 15 |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief And Extended Maturity | Minimum |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Financing receivable modified, weighted average term increase from modification |  | 4 months | 12 months |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief And Extended Maturity | Maximum |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Financing receivable modified, weighted average term increase from modification |  | 23 months | 30 months |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief And Extended Maturity, Fourteen Loans |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Financing receivable, amount modified in period |  | $ 361,800 |  |  |  |  |
Multifamily | Bridge loans | Extended Maturity |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Number of financing receivables modified during the period | loan |  | 12 |  |  |  |  |
Financing receivable, amount modified in period |  | $ 201,900 |  |  |  |  |
Number of financing receivables with extended maturities | loan |  | 8 |  |  |  |  |
Multifamily | Bridge loans | Extended Maturity | Minimum |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Financing receivable modified, weighted average term increase from modification |  | 6 months |  |  |  |  |
Multifamily | Bridge loans | Extended Maturity | Maximum |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Financing receivable modified, weighted average term increase from modification |  | 15 months |  |  |  |  |
Multifamily | Bridge loans | Loan Modification, Extended Maturity, Twelve Loans |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Financing receivable, amount modified in period |  | $ 321,700 |  |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief, Twenty Three Loans |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Number of financing receivables modified during the period | loan |  |  | 23 |  |  |  |
Financing receivable, amount modified in period |  |  | $ 1,070,000 |  |  |  |
Multifamily | Bridge loans | Temporary Interest Rate Relief |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Number of impaired loans (less unearned revenue and other holdbacks and adjustments) by asset class | loan |  |  | 2 |  |  |  |
Loan loss reserve, specifically impaired loans |  |  | $ 7,000 |  |  |  |
Total UPB, specifically impaired loans |  |  | $ 49,600 |  |  |  |
Multifamily | Bridge loans | Extended Maturity |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Number of financing receivables modified during the period | loan |  |  | 11 |  |  |  |
Financing receivable, amount modified in period |  |  | $ 456,500 |  |  |  |
Multifamily | Bridge loans | Extended Maturity | Minimum |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Financing receivable modified, weighted average term increase from modification |  |  | 2 months |  |  |  |
Multifamily | Bridge loans | Extended Maturity | Maximum |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Financing receivable modified, weighted average term increase from modification |  |  | 19 months |  |  |  |
Multifamily | Bridge loans | Rate of Interest and Extended Maturity |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Financing receivable, amount modified in period |  |  |  | $ 86,900 |  |  |
Variable rate, spread |  |  |  | 4.25% |  |  |
Financing receivable modified, weighted average term increase from modification |  |  |  | 1 year |  |  |
Financing receivable modified, pay rate of interest |  |  |  | $ 500 |  |  |
Multifamily | Bridge loans | Interest Deferral, Extended Maturity, And Interest Forgiveness |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Number of financing receivables modified during the period | loan |  |  |  | 3 |  |  |
Financing receivable, amount modified in period |  |  |  | $ 241,000 |  |  |
Financing receivable modified, weighted average term increase from modification |  |  |  | 1 year |  |  |
Percentage of deferred interest waived |  |  |  | 0.25 |  |  |
Multifamily | Bridge loans | Interest Deferral, Extended Maturity, And Interest Forgiveness | Minimum |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Variable rate, spread |  |  |  | 4.00% |  |  |
Percentage of interest foregone |  |  |  | 0.0200 |  |  |
Multifamily | Bridge loans | Interest Deferral, Extended Maturity, And Interest Forgiveness | Maximum |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Variable rate, spread |  |  |  | 4.30% |  |  |
Percentage of interest foregone |  |  |  | 0.0215 |  |  |
Office |  |  |  |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |  |  |  |
Financing receivable, net of reserve |  |  |  | $ 37,100 |  |  | 37,100
Financing receivable, reserve for credit loss |  |  |  | 8,000 |  |  | $ 8,000
Loan reserve |  |  |  | $ 2,300 |  |  |

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