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Loans and Investments - Investment Portfolio and Concentration of Credit Risk (Details) | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) loan borrower | Dec. 31, 2020 USD ($) borrower loan | Mar. 31, 2021 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($)
Loans and Investments |  |  |  |  |  |
Loans and investments, gross | $ 7,385,929,000 | $ 5,475,082,000 |  |  |  |
Allowance for credit losses | (138,447,000) | (148,329,000) | $ (147,300,000) | $ (152,811,000) | $ (142,252,000) | $ (152,811,000)
Unearned revenue | (33,567,000) | (40,885,000) |  |  |  |
Loans and investments, net | $ 7,213,915,000 | $ 5,285,868,000 |  |  |  |
Percent of Total | 100.00% | 100.00% |  |  |  |
Loan Count | loan | 405 | 328 |  |  |  |
Wtd. Avg. Pay Rate (as a percent) | 4.85% | 5.23% |  |  |  |
Wtd. Avg. Remaining Months to Maturity | 20 months 3 days | 19 months 6 days |  |  |  |
Wtd. Avg. First Dollar LTV Ratio (as percent) | 3.00% | 4.00% |  |  |  |
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 76.00% | 77.00% |  |  |  |
Credit risk concentration |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |
Wtd. Avg. First Dollar LTV Ratio (as percent) | 3.00% |  |  |  |  |
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 76.00% |  |  |  |  |
Credit risk concentration | Single-Family Rental |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |
Percent of Total | 3.00% |  |  |  |  |
Wtd. Avg. First Dollar LTV Ratio (as percent) | 0.00% |  |  |  |  |
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 63.00% |  |  |  |  |
Total assets | Credit risk concentration |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |
Loan Count | loan | 21 | 22 |  |  |  |
Number of different borrowers | borrower | 5 | 5 |  |  |  |
Total assets | Credit risk concentration | Five Borrowers |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |
Concentration risk, percentage | 12.00% | 12.00% |  |  |  |
Bridge loans |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |
Loans and investments, gross | $ 6,907,594,000 | $ 5,022,509,000 |  |  |  |
Percent of Total | 94.00% | 92.00% |  |  |  |
Loan Count | loan | 360 | 263 |  |  |  |
Wtd. Avg. Pay Rate (as a percent) | 4.75% | 5.09% |  |  |  |
Wtd. Avg. Remaining Months to Maturity | 18 months 18 days | 16 months 6 days |  |  |  |
Wtd. Avg. First Dollar LTV Ratio (as percent) | 0.00% | 0.00% |  |  |  |
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 75.00% | 76.00% |  |  |  |
Bridge loans | Single-Family Rental |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |
Number of loans under the loan portfolio | loan | 77 | 38 |  |  |  |
Total loan commitment | $ 533,900,000 | $ 309,200,000 |  |  |  |
Preferred equity investments |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |
Loans and investments, gross | $ 224,814,000 | $ 224,928,000 |  |  |  |
Percent of Total | 3.00% | 4.00% |  |  |  |
Loan Count | loan | 14 | 14 |  |  |  |
Wtd. Avg. Pay Rate (as a percent) | 6.39% | 7.07% |  |  |  |
Wtd. Avg. Remaining Months to Maturity | 44 months 21 days | 49 months 24 days |  |  |  |
Wtd. Avg. First Dollar LTV Ratio (as percent) | 64.00% | 64.00% |  |  |  |
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 90.00% | 89.00% |  |  |  |
Mezzanine loans |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |
Loans and investments, gross | $ 224,107,000 | $ 159,242,000 |  |  |  |
Percent of Total | 3.00% | 3.00% |  |  |  |
Loan Count | loan | 29 | 29 |  |  |  |
Wtd. Avg. Pay Rate (as a percent) | 6.61% | 7.40% |  |  |  |
Wtd. Avg. Remaining Months to Maturity | 36 months 6 days | 45 months |  |  |  |
Wtd. Avg. First Dollar LTV Ratio (as percent) | 27.00% | 32.00% |  |  |  |
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 83.00% | 82.00% |  |  |  |
Other loans |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |
Loans and investments, gross | $ 29,414,000 | $ 68,403,000 |  |  |  |
Percent of Total | 1.00% | 1.00% |  |  |  |
Loan Count | loan | 2 | 22 |  |  |  |
Wtd. Avg. Pay Rate (as a percent) | 4.63% | 4.95% |  |  |  |
Wtd. Avg. Remaining Months to Maturity | 54 months 6 days | 74 months 24 days |  |  |  |
Wtd. Avg. First Dollar LTV Ratio (as percent) | 0.00% | 0.00% |  |  |  |
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 69.00% | 69.00% |  |  |  |
Other loans | Single-Family Rental |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |
Number of loans under the loan portfolio | loan | 2 | 22 |  |  |  |
Unpaid principal balance, funded | $ 191,500,000 | $ 88,100,000 |  |  |  |
Transfer of fixed rate SFR from Structured Business to Agency Business |  |  | 21 |  |  |
Transfer of UPB from Structured Business To Agency Business |  |  | $ 65,200,000 |  |  |

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- Definition Represents the weighted average First Dollar LTV Ratio that is calculated by comparing the total of the company's senior most dollar and all senior lien positions within the capital stack to the fair value of the underlying collateral to determine the point at which the company will absorb a total loss of its position. + References No definition available. + Details
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- Definition Represents the weighted average loan to value ratio that is calculated by comparing the total of the carrying value of the company's loan and all senior lien positions within the capital stack to the fair value of the underlying collateral to determine the point at which the company will initially absorb a loss. + References No definition available. + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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