Transactions with Affiliate Companies - Income Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	$ 26,217	$ 44,283	$ 49,779
Dividend Income	2,096	4,292	4,188
Non-controlled affiliate company investments
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	5,026	10,247
Dividend Income	237	220	283
Other Income	0	18
Non-controlled affiliate company investments \| American Community Homes, Inc.
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	1,349	1,982
Dividend Income	0	0
Other Income	0	0
Non-controlled affiliate company investments \| Ascent Midco, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend Income	237	220
Other Income	0	0
Non-controlled affiliate company investments \| Familia Dental Group Holdings, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend Income	0	0
Other Income	0	0
Non-controlled affiliate company investments \| HFZ Capital Group, LLC and MC Asset Management (Corporate), LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	2,899	6,343
Dividend Income	0	0
Other Income	0	0
Non-controlled affiliate company investments \| Mnine Holdings, Inc.
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	889
Dividend Income	0	0
Other Income	0	18
Non-controlled affiliate company investments \| NationsBenefits, LLC (Revolver)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend Income	0	0
Other Income	0	0
Non-controlled affiliate company investments \| Second Avenue SFR Holdings II LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income		330
Dividend Income		0
Other Income		0
Non-controlled affiliate company investments \| SFR Holdco LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	592	657
Dividend Income	0	0
Other Income	0	0
Non-controlled affiliate company investments \| SFR Holdco 2, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	176	14
Dividend Income	0	0
Other Income	0	0
Non-controlled affiliate company investments \| TJ Management HoldCo LLC (Revolver)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	10	32
Dividend Income	0	0
Other Income	0	0
Controlled affiliate company investments
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend Income	1,600	3,600	$ 3,600
Other Income	0	0
Controlled affiliate company investments \| MRCC Senior Loan Fund I, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend Income	1,600	3,600
Other Income	0	0
Investment, Identifier [Axis]: American Community Homes, Inc. 1
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	611	900
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: American Community Homes, Inc. 2
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	301	442
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: American Community Homes, Inc. 3
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	37	56
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: American Community Homes, Inc. 4
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	137	200
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: American Community Homes, Inc. 5
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	252	373
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: American Community Homes, Inc. 6
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	3
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: American Community Homes, Inc. 7
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	4	7
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: American Community Homes, Inc., Common stock
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: American Community Homes, Inc., Revolver
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	7	1
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: Ascent Midco, LLC, Class A units
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend Income	237	220
Other Income	0	0
Investment, Identifier [Axis]: Familia Dental Group Holdings, LLC, Class A units
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: HFZ Capital Group, LLC 1
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	1,075	2,409
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: HFZ Capital Group, LLC 2
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	385	845
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: MC Asset Management (Corporate), LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	1,109	2,379
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: MC Asset Management (Corporate), LLC (Delayed Draw)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	330	710
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: MC Asset Management (Corporate), LLC, LLC interest
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: MRCC Senior Loan Fund I, LLC
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend Income	1,600	3,600
Other Income	0	0
Investment, Identifier [Axis]: Mnine Holdings, Inc. 1
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	871
Dividend Income	0	0
Other Income	0	16
Investment, Identifier [Axis]: Mnine Holdings, Inc. 2
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	7
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: Mnine Holdings, Inc., Class B units
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: Mnine Holdings, Inc., Revolver
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	11
Dividend Income	0	0
Other Income	0	2
Investment, Identifier [Axis]: NECB Collections, LLC (Revolver)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: NECB Collections, LLC, LLC units
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: SFR Holdco 2, LLC (Delayed Draw)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	176	14
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: SFR Holdco 2, LLC (Equity Commitment)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: SFR Holdco, LLC (Delayed Draw)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	592	657
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: SFR Holdco, LLC (Equity Commitment)
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: Second Avenue SFR Holdings II LLC, Revolver
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income		330
Dividend Income		0
Other Income		0
Investment, Identifier [Axis]: TJ Management HoldCo, LLC, Common stock
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	0	0
Dividend Income	0	0
Other Income	0	0
Investment, Identifier [Axis]: TJ Management HoldCo, LLC, Revolver
Investments in and Advances to Affiliates, Activity [Line Items]
Interest Income	10	32
Dividend Income	0	0
Other Income	$ 0	$ 0