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Loans and Investments - Non-performing and other Non-Accrued Loans (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) loan | Dec. 31, 2022 USD ($) loan | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Financing Receivable, Past Due [Line Items] |  |  |  |
Number of loans | loan | 747 | 747 |  |
Carrying value of loans | $ 12,615,006,000 |  |  |
Accrued interest receivable related to loans | 124,200,000 | $ 108,500,000 |  |
Loans and investments, net allowance for credit losses | $ 195,664,000 | 132,559,000 | $ 113,241,000 | $ 148,329,000
Six Loans Collateralized by a Land Development Project |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number of loans with unpaid principal balance | loan | 6 |  |  |
Unpaid principal balance on loans | $ 121,400,000 |  |  |
Five Loans Collateralized by a Land Development Project |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number of loans with unpaid principal balance | loan | 5 |  |  |
Unpaid principal balance on loans | $ 112,100,000 |  |  |
Weighted average accrual rate of interest (as a percent) | 7.91% |  |  |
Loans and investments, net allowance for credit losses | $ 71,400,000 | $ 71,400,000 |  |
Bridge Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number of loans | loan | 679 | 692 |  |
Carrying value of loans | $ 12,273,244,000 |  |  |
Unpaid principal balance on loans |  | $ 296,900,000 |  |
Multifamily |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans and investments, net allowance for credit losses | 110,847,000 | $ 37,961,000 | $ 18,707,000 | $ 36,468,000
Multifamily | Bridge Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Specifically reserved loan, loan loss reserve | 3,000,000 |  |  |
Specifically reserved loan, UPB | $ 32,600,000 |  |  |
Multifamily | Bridge Loans | Financial Asset, Less Than 60 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number of loans with late and partial payments | loan | 24 |  |  |
Accrued interest receivable related to loans | $ 956,900,000 |  |  |
Non-performing loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Number of loans | loan | 16 | 4 |  |
Carrying value of loans | $ 235,600,000 | $ 2,600,000 |  |
Loan loss reserves | 27,100,000 | 5,100,000 |  |
Interest receivable | 92,500,000 | 0 |  |
Non-performing loans | Greater Than 90 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Interest receivable | $ 0 | $ 0 |  |

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