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Debt Obligations, Credit and Repurchase Facilities (Details) - USD ($) |  |  |  | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Feb. 28, 2021 | Jan. 31, 2021 | Mar. 31, 2021 | Jan. 31, 2021 | Jun. 30, 2021 | May 31, 2021 | Dec. 31, 2020
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | $ 2,015,188,000 |  | $ 2,234,883,000
Collateral Carrying Value |  |  |  |  |  | $ 2,757,662,000 |  | 2,724,420,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 2.32% |  |
Joint Repurchase Facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 2,000,000,000.00 |  |
Committed amount |  |  |  |  |  | 50,000,000.0 |  |
Matures in March 2021 |  |  |  |  |  | $ 5.75 |  |
Maximum advance rate |  |  |  |  |  | 80.00% |  |
$400M repurchase facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  |  | 1.75% |  | 1.75% |  |  |
Repurchase facility - securities | B Piece bonds |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Collateral Carrying Value |  |  |  |  |  | $ 53,100,000 |  | 58,500,000
$400 million credit facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 400,000,000.0 |  |
Collateral Carrying Value |  |  |  |  |  | 725,000,000.0 |  |
$200M credit facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  |  | $ 200,000,000.0 |
Collateral Carrying Value |  |  |  |  |  |  | $ 250,000,000.0 |
Structured Business |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 1,623,398,000 |  | 1,282,845,000
Collateral Carrying Value |  |  |  |  |  | $ 2,310,652,000 |  | $ 1,755,825,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 2.48% |  |
Weighted average note rate including certain fees and costs (as a percent) |  |  |  |  |  | 2.73% |  | 2.97%
Unamortized deferred finance costs |  |  |  |  |  | $ 4,000,000.0 |  | $ 3,300,000
Leverage on loans and investment portfolio financed through credit facilities and repurchase agreements, excluding securities repurchase facility, working capital line of credit and security agreements used to finance leasehold and capital expenditure improvements at corporate office (as a percent) |  |  |  |  |  |  |  | 69.00%
Structured Business | $1.8B joint repurchase facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 660,685,000 |  | $ 681,006,000
Collateral Carrying Value |  |  |  |  |  | $ 947,249,000 |  | 1,054,562,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 2.51% |  |
Maximum borrowing capacity |  |  |  |  |  | $ 1,800,000,000 |  | 1,800,000,000
Structured Business | $400M repurchase facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  |  | 1.75% |  |  |
LIBOR Floor rate |  |  | 0.35% |  | 0.35% |  |  |
Maximum borrowing capacity |  |  | $ 400,000,000.0 |  | $ 400,000,000.0 |  |  |
Decrease in interest rate (as a percent) |  |  | 2.00% |  |  |  |  |
Utilization of credit facility |  |  | $ 250,000,000.0 |  | $ 250,000,000.0 |  |  |
Structured Business | $400M repurchase facility | Minimum |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  |  | 2.00% |  |  |
Structured Business | $400M repurchase facility | Maximum |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  |  | 2.20% |  |  |
Structured Business | $725M repurchase facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 335,477,000 |  | 191,622,000
Collateral Carrying Value |  |  |  |  |  | $ 466,109,000 |  | 259,559,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 2.10% |  |
Maximum borrowing capacity |  |  |  |  |  | $ 725,000,000 |  | 725,000,000
Structured Business | $200 million repurchase facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 200,000,000.0 |  |  | $ 200,000,000.0 |  |  |  |
Structured Business | $200 million repurchase facility | LIBOR |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Maximum advance rate |  |  |  | 80.00% |  |  |  |
Structured Business | $200 million repurchase facility | Minimum | LIBOR |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) | 1.75% |  |  | 1.75% |  |  |  |
Structured Business | $200 million repurchase facility | Maximum | LIBOR |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) | 2.75% |  |  | 2.75% |  |  |  |
Structured Business | $250M repurchase facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 104,251,000 |  |
Collateral Carrying Value |  |  |  |  |  | $ 260,922,000 |  |
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 1.87% |  |
Maximum borrowing capacity |  |  |  |  |  | $ 250,000,000 |  | 250,000,000
Structured Business | $198.7M repurchase facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 139,441,000 |  | 71,627,000
Collateral Carrying Value |  |  |  |  |  | $ 164,583,000 |  | 87,242,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 3.04% |  |
Maximum borrowing capacity |  |  |  |  |  | $ 198,700,000 |  | 198,700,000
Structured Business | $187.3M loan specific credit facilities |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 187,059,000 |  | 148,615,000
Collateral Carrying Value |  |  |  |  |  | $ 251,550,000 |  | 198,550,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 3.04% |  |
Maximum borrowing capacity |  |  |  |  |  | $ 187,300,000 |  | 187,300,000
Structured Business | $150M credit facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 8,576,000 |  | 23,606,000
Collateral Carrying Value | $ 150,000,000.0 |  |  | $ 150,000,000.0 |  | $ 15,132,000 |  | 31,809,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 3.90% |  |
LIBOR Floor rate | 0.15% |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 150,000,000 |  | 150,000,000
Structured Business | $100 million credit facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | 100,000,000 |  | 100,000,000
Structured Business | $100 million credit facility - one |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 58,625,000 |  | 39,346,000
Collateral Carrying Value |  |  |  |  |  | $ 83,800,000 |  | 47,912,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 1.88% |  |
Maximum borrowing capacity |  |  |  |  |  | $ 100,000,000 |  | 100,000,000
Structured Business | $100 million credit facility - two |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 9,936,000 |  |
Collateral Carrying Value |  |  |  |  |  | $ 13,773,000 |  |
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 4.06% |  |
Structured Business | $100 million repurchase facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | $ 48,847,000 |  | 31,780,000
Collateral Carrying Value |  |  |  |  |  | $ 61,211,000 |  | 40,551,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 1.88% |  |
Maximum borrowing capacity |  |  |  |  |  | $ 100,000,000 |  | 100,000,000
Structured Business | $50 million credit facility - one |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 22,407,000 |  | 15,992,000
Collateral Carrying Value |  |  |  |  |  | $ 28,009,000 |  | 21,300,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 2.13% |  |
Maximum borrowing capacity |  |  |  |  |  | $ 50,000,000 |  | 50,000,000
Structured Business | $30M working capital facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  |  |  | 30,000,000
Maximum borrowing capacity |  |  |  |  |  | 30,000,000 |  | 30,000,000
Structured Business | $50 million credit facility - two |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value | $ 50,000,000.0 |  |  | 50,000,000.0 |  |  |  |
Structured Business | $25 million credit facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 12,583,000 |  | 9,323,000
Collateral Carrying Value |  |  |  |  |  | $ 18,314,000 |  | 14,340,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 2.38% |  |
Maximum borrowing capacity |  |  |  |  |  | $ 25,000,000 |  | 25,000,000
Structured Business | $1M master security agreements |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | $ 944,000 |  | 1,441,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 4.01% |  |
Maximum borrowing capacity |  |  |  |  |  | $ 1,000,000 |  | 1,000,000
Structured Business | Repurchase facilities - securities (3) |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | $ 34,567,000 |  | 38,487,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 3.55% |  |
Structured Business | Repurchase facility - securities |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  |  |  | 10,000,000.0
Structured Business | $21.6 million credit facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  | 3.00% |  |  |  |  |  |
Committed amount |  | $ 21,600,000 |  |  |  |  |  |
Structured Business | 18.2 million credit facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 18,200,000 |  |  | $ 18,200,000 |  |  |  |
Structured Business | 18.2 million credit facility | Prime Rate |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
LIBOR Floor rate |  |  |  | 3.25% |  |  |  |
Agency Business |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | $ 391,790,000 |  | 952,038,000
Collateral Carrying Value |  |  |  |  |  | $ 447,010,000 |  | 968,595,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 1.64% |  |
Unamortized deferred finance costs |  |  |  |  |  | $ 2,200,000 |  | 600,000
Agency Business | $400M repurchase facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 119,382,000 |  | 174,515,000
Collateral Carrying Value |  |  |  |  |  | $ 119,398,000 |  | 174,555,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 1.60% |  |
Maximum borrowing capacity |  |  |  |  |  | $ 400,000,000 |  | 400,000,000
Agency Business | $150M credit facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 15,073,000 |  | 49,632,000
Collateral Carrying Value |  |  |  |  |  | $ 15,073,000 |  | 49,754,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 1.65% |  |
Variable rate, spread (as a percent) | 0.002% |  |  |  |  |  |  |
LIBOR Floor rate | 0.0025% |  |  |  |  |  |  |
Maximum borrowing capacity | $ 150,000,000.0 |  |  | $ 150,000,000.0 |  | $ 150,000,000 |  | 150,000,000
Additional borrowing capacity | $ 200,000,000.0 |  |  | $ 200,000,000.0 |  |  |  |
Agency Business | $100 million credit facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 2,592,000 |  | 88,896,000
Collateral Carrying Value |  |  |  |  |  | $ 2,600,000 |  | 88,911,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 1.65% |  |
Maximum borrowing capacity |  |  |  |  |  | $ 100,000,000 |  | 100,000,000
Agency Business | $750M ASAP agreement |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 76,943,000 |  | 301,455,000
Collateral Carrying Value |  |  |  |  |  | $ 76,943,000 |  | 302,491,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 1.40% |  |
Maximum borrowing capacity |  |  |  |  |  | $ 750,000,000 |  | 750,000,000
Agency Business | $200M joint repurchase facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 104,876,000 |  | 42,808,000
Collateral Carrying Value |  |  |  |  |  | $ 135,934,000 |  | 56,186,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 1.85% |  |
Maximum borrowing capacity |  |  |  |  |  | $ 200,000,000 |  | 200,000,000
Agency Business | $200M credit facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 71,656,000 |  | 294,732,000
Collateral Carrying Value |  |  |  |  |  | $ 95,575,000 |  | 296,698,000
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 1.60% |  |
Maximum borrowing capacity |  |  |  |  |  | $ 200,000,000 |  | 200,000,000
Agency Business | $1.3 million repurchase facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Debt Carrying Value |  |  |  |  |  | 1,268,000 |  |
Collateral Carrying Value |  |  |  |  |  | $ 1,487,000 |  |
Weighted Average Note Rate (as a percent) |  |  |  |  |  | 3.00% |  |
Maximum borrowing capacity |  |  |  |  |  | $ 1,300,000 |  | $ 1,300,000

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