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Fair Value, Carrying Value and Estimated Fair Value (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financial assets: |  |  |  |
Loans and investments, net - Principal/Notional Amount | $ 12,158,995,000 | $ 5,475,082,000 |  |
Loans and investments, net | 11,981,048,000 | 5,285,868,000 | $ 4,189,960,000 | $ 3,200,145,000
Loans held-for-sale, net - Principal/Notional Amount | 1,077,239,000 | 968,595,000 |  |
Loans held-for-sale, net | 1,077,239,000 | 968,595,000 |  |
Securities, held-to-maturity, net - Principal/Notional Amount | 210,728,000 | 140,124,000 |  |
Securities held-to-maturity, net | 140,484,000 | 95,524,000 |  |
Derivative financial instruments - Principal/Notional Amount | 280,654,000 | 865,975,000 |  |
Financial liabilities: |  |  |  |
Credit and repurchase facilities, Principal/Notional Amount | 4,493,699,000 | 2,238,722,000 |  |
Credit and repurchase facilities, Carrying value | 4,481,579,000 | 2,234,883,000 |  |
Collateralized loan obligations | 5,892,810,000 | 2,517,309,000 |  |
Senior unsecured notes | 1,280,545,000 | 662,843,000 |  |
Convertible senior unsecured notes, net | 259,385,000 | 267,973,000 |  |
Junior subordinated notes | 142,382,000 | 141,656,000 |  |
Related party financing | 0 |  |  |
Derivative financial instruments - Principal/Notional Amount | $ 301,816,000 | 319,142,000 |  |
Minimum |  |  |  |
Financial liabilities: |  |  |  |
Period of loans held for sale sold | 60 days |  |  |
Maximum |  |  |  |
Financial liabilities: |  |  |  |
Period of loans held for sale sold | 180 days |  |  |
Carrying Value |  |  |  |
Financial assets: |  |  |  |
Loans and investments, net | $ 11,981,048,000 | 5,285,868,000 |  |
Loans held-for-sale, net | 1,093,609,000 | 986,919,000 |  |
Capitalized mortgage servicing rights, net | 422,734,000 | 379,974,000 |  |
Securities held-to-maturity, net | 140,484,000 | 95,524,000 |  |
Derivative financial instruments | 1,665,000 | 3,892,000 |  |
Financial liabilities: |  |  |  |
Credit and repurchase facilities, Carrying value | 4,481,579,000 | 2,234,883,000 |  |
Collateralized loan obligations | 5,892,810,000 | 2,517,309,000 |  |
Senior unsecured notes | 1,280,545,000 | 662,843,000 |  |
Convertible senior unsecured notes, net | 259,385,000 | 267,973,000 |  |
Junior subordinated notes | 142,382,000 | 141,656,000 |  |
Derivative financial instruments | 1,482,000 | 1,221,000 |  |
Estimated Fair Value Disclosure |  |  |  |
Financial assets: |  |  |  |
Loans and investments, net | 12,181,194,000 | 5,428,141,000 |  |
Loans held-for-sale, net | 1,117,085,000 | 1,007,294,000 |  |
Capitalized mortgage servicing rights, net | 477,323,000 | 415,495,000 |  |
Securities held-to-maturity, net | 149,911,000 | 94,128,000 |  |
Derivative financial instruments | 1,665,000 | 3,892,000 |  |
Financial liabilities: |  |  |  |
Credit and repurchase facilities, Carrying value | 4,484,107,000 | 2,235,668,000 |  |
Collateralized loan obligations | 5,914,453,000 | 2,495,195,000 |  |
Senior unsecured notes | 1,301,708,000 | 670,117,000 |  |
Convertible senior unsecured notes, net | 294,690,000 | 280,636,000 |  |
Junior subordinated notes | 101,698,000 | 99,594,000 |  |
Derivative financial instruments | 1,482,000 | 1,221,000 |  |
Collateralized loan obligations |  |  |  |
Financial liabilities: |  |  |  |
Collateralized loan obligations | 5,892,810,000 | 2,517,309,000 |  |
Debt instrument - Principal/Notional Amount | 5,924,705,000 | 2,532,343,000 |  |
Collateralized debt obligations |  |  |  |
Financial liabilities: |  |  |  |
Debt instrument - Principal/Notional Amount | 5,924,705,000 | 2,532,343,000 |  |
Senior Unsecured Notes |  |  |  |
Financial liabilities: |  |  |  |
Debt instrument - Principal/Notional Amount | 1,295,750,000 | 670,750,000 |  |
Convertible Senior Unsecured Notes |  |  |  |
Financial liabilities: |  |  |  |
Debt instrument - Principal/Notional Amount | 264,000,000 | 278,300,000 |  |
Junior subordinated notes |  |  |  |
Financial liabilities: |  |  |  |
Junior subordinated notes | 142,400,000 | 141,700,000 |  |
Debt instrument - Principal/Notional Amount | $ 154,336,000 | $ 154,336,000 |  |

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