COMMERCIAL MORTGAGE LOANS HELD-FOR-INVESTMENT - Summary of Commercial Loan Risk Ratings (Details)		3 Months Ended	12 Months Ended
		Mar. 31, 2025 USD ($) mortgageLoan	Dec. 31, 2024 USD ($) mortgageLoan
Financing Receivable, Credit Quality Indicator [Line Items]
Outstanding Principal	[1]	$ 1,005,841,618	$ 1,060,123,298
Average risk rating, moderate		3.5	3.5
Commercial Real Estate Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans | mortgageLoan		61	65
Outstanding Principal		$ 1,010,888,938	$ 1,065,563,646
Year 1			58,068,230
Year 2		58,156,399	17,973,555
Year 3		17,916,725	511,654,760
Year 4		468,374,445	$ 461,106,533
Year 5		$ 444,333,855
Commercial Real Estate Portfolio Segment | Risk rating, 1
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans | mortgageLoan		0	0
Outstanding Principal		$ 0	$ 0
Year 1			0
Year 2		0	0
Year 3		0	0
Year 4		0	$ 0
Year 5		$ 0
Commercial Real Estate Portfolio Segment | Risk rating, 2
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans | mortgageLoan		4	3
Outstanding Principal		$ 76,760,000	$ 57,840,000
Year 1			27,048,495
Year 2		27,070,437	0
Year 3		0	30,416,761
Year 4		49,407,848	$ 0
Year 5		0
Transition of commercial loans held for sale to a lower risk rating		$ 18,900,000
Commercial Real Estate Portfolio Segment | Risk rating, 3
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans | mortgageLoan		30	40
Outstanding Principal		$ 520,736,897	$ 616,637,103
Year 1			31,019,735
Year 2		31,085,962	17,973,555
Year 3		0	266,895,843
Year 4		154,791,261	$ 294,277,177
Year 5		$ 329,876,961
Average risk rating, percentage		59.90%	63.70%
Commercial loans that paid off		$ 51,700,000
Transition of commercial loans held for sale to a lower risk rating		$ 100,300,000
Commercial Real Estate Portfolio Segment | Risk rating, 4
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans | mortgageLoan		20	16
Outstanding Principal		$ 304,972,794	$ 292,826,616
Year 1			0
Year 2		0	0
Year 3		17,916,725	140,183,307
Year 4		208,599,221	$ 147,641,857
Year 5		74,141,021
Commercial loans that paid off		1,000,000.0
Transition of commercial loans held for sale to a higher risk rating		155,200,000
Transition of commercial loans held for sale to a lower risk rating		$ 6,100,000
Commercial Real Estate Portfolio Segment | Risk rating, 5
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans | mortgageLoan		7	6
Outstanding Principal		$ 108,419,247	$ 98,259,927
Year 1			0
Year 2		0	0
Year 3		0	74,158,849
Year 4		55,576,115	$ 19,187,499
Year 5		40,315,873
Commercial loans that paid off		2,000,000
Transition of commercial loans held for sale to a higher risk rating		$ 47,900,000

[1] Our consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs") as the Company was the primary beneficiary of these VIEs. As of March 31, 2025 and December 31, 2024, assets of consolidated VIEs totaled $996,233,424 and $1,058,138,406, respectively and the liabilities of consolidated VIEs totaled $774,692,458 and $831,001,605 respectively. See Note 4 for further discussion.