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Real Estate Owned - Brooklyn Development (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 03, 2022 | Mar. 31, 2024 | Mar. 31, 2023 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2023 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2015
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Debt related to real estate owned, held for investment, net |  |  | $ 161,878 |  |  |  | $ 161,562 |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  | $ 10,000 | $ (20,000) |  |  |  |
Valuation allowance, loan held for sale |  |  | 0 | $ (4,624) |  |  |  |  |  |
Debt instrument, covenant, unencumbered liquidity, threshold |  |  | 100,000 |  |  |  |  |  |  |
Debt instrument, covenant, net worth threshold |  |  | 600,000 |  |  |  |  |  |  |
Interest rate cap |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Notional Amount (in thousands) |  |  |  |  |  |  |  |  | $ 1,100 |
Interest rate cap | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Notional Amount (in thousands) |  |  | 164,835 |  |  |  | 164,835 |  |  |
Derivative Financial Instruments, Assets | Interest rate cap | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Notional Amount (in thousands) |  |  | $ 1,200 |  |  |  |  |  |  |
Secured Overnight Financing Rate |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate for repurchase facility |  |  | 2.55% |  |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings |  |  | $ 388,400 |  |  |  |  |  |  |
Line of credit facility, option to extend, period |  |  | 1 year |  |  |  |  |  |  |
Mortgages |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Debt related to real estate owned, held for investment, net |  |  | $ 161,900 |  |  |  | 161,600 |  |  |
Less: deferred financing costs |  |  | 3,000 |  |  |  | 3,200 |  |  |
JV Partner |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Financing receivable, loan in process |  | $ 164,800 |  |  |  |  |  |  |  |
JV Partner | Joint venture |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 100.00% |  |  |  |  |  |  |  |
Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net | [1],[2] |  | 303,965 |  |  |  | 432,734 |  |  |
Multifamily Development - Brooklyn, NY | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Debt related to real estate owned, held for investment, net |  |  |  |  |  |  |  |  |  | $ 122,200
Increase in Specific CECL Allowance, net |  |  |  |  |  |  |  | $ (30,000) |  |
Deed-In-Lieu Of Foreclosure |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net |  | $ 226,500 | 411,700 |  |  |  | 374,200 |  |  |
Real estate investment property, net |  | 270,100 |  |  |  |  |  |  |  |
Valuation allowance, loan held for sale |  | $ 43,600 |  |  |  |  |  |  |  |
Financing receivable, construction and finance costs capitalized |  |  | 37,500 |  |  |  | 13,900 |  |  |
Construction costs |  |  | $ 190,400 |  |  |  | $ 152,900 |  |  |
[1] | Includes $246,725 and $232,991 pledged as collateral under secured debt arrangements in 2024 and 2023, respectively.
[2] | Net of $367,558 and $219,482 CECL Allowances comprised of $335,000 and $193,000 Specific CECL Allowance and $32,558 and $26,482 General CECL Allowance in 2024 and 2023, respectively.

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