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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Classification and Carrying Value of Unconsolidated VIEs (Details) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Total assets | [1] | $ 4,718,301,000 | $ 23,483,369,000
VIE, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 415,291,000 | 400,914,000
VIE, Not Primary Beneficiary | Investment securities available for sale, at fair value |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 42,344,000 | 49,214,000
VIE, Not Primary Beneficiary | Preferred equity and mezzanine loan investments |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 179,292,000 | 180,045,000
VIE, Not Primary Beneficiary | Investments in unconsolidated entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 193,655,000 | 171,655,000
VIE, Not Primary Beneficiary | ABS |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 42,344,000 | 49,214,000
VIE, Not Primary Beneficiary | ABS | Investment securities available for sale, at fair value |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 42,344,000 | 49,214,000
VIE, Not Primary Beneficiary | ABS | Preferred equity and mezzanine loan investments |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 | 0
VIE, Not Primary Beneficiary | ABS | Investments in unconsolidated entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 | 0
VIE, Not Primary Beneficiary | Preferred equity investments in multi-family properties |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 300,728,000 | 279,908,000
VIE, Not Primary Beneficiary | Preferred equity investments in multi-family properties | Investment securities available for sale, at fair value |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 | 0
VIE, Not Primary Beneficiary | Preferred equity investments in multi-family properties | Preferred equity and mezzanine loan investments |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 173,863,000 | 173,825,000
VIE, Not Primary Beneficiary | Preferred equity investments in multi-family properties | Investments in unconsolidated entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 126,865,000 | 106,083,000
VIE, Not Primary Beneficiary | Mezzanine loans on multi-family properties |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 5,429,000 | 6,220,000
VIE, Not Primary Beneficiary | Mezzanine loans on multi-family properties | Investment securities available for sale, at fair value |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 | 0
VIE, Not Primary Beneficiary | Mezzanine loans on multi-family properties | Preferred equity and mezzanine loan investments |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 5,429,000 | 6,220,000
VIE, Not Primary Beneficiary | Mezzanine loans on multi-family properties | Investments in unconsolidated entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 | 0
VIE, Not Primary Beneficiary | Equity investments in entities that invest in residential properties and loans |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 66,790,000 | 65,572,000
VIE, Not Primary Beneficiary | Equity investments in entities that invest in residential properties and loans | Investment securities available for sale, at fair value |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 | 0
VIE, Not Primary Beneficiary | Equity investments in entities that invest in residential properties and loans | Preferred equity and mezzanine loan investments |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 | 0
VIE, Not Primary Beneficiary | Equity investments in entities that invest in residential properties and loans | Investments in unconsolidated entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | $ 66,790,000 | $ 65,572,000
[1] | Our condensed consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs") as the Company is the primary beneficiary of these VIEs. As of March 31, 2020 and December 31, 2019, assets of consolidated VIEs totaled $1,283,255 and $19,270,384, respectively, and the liabilities of consolidated VIEs totaled $1,076,678 and $17,878,314, respectively. See Note 9 for further discussion.

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