Borrowings - Summary of SBA-guaranteed Debentures (Details) $ in Thousands	Sep. 30, 2024 USD ($)
Debt Instrument [Line Items]
Debenture Amount	$ 300,000
$37,500 SBA-guaranteed Debentures, Issued March 2015 | SBIC I
Debt Instrument [Line Items]
Debenture Amount	$ 37,500
$37,500 SBA-guaranteed Debentures, Issued March 2015 | SBIC I | SBA-guaranteed debentures
Debt Instrument [Line Items]
Interest Rate	2.517%
SBA Annual Charge	0.355%
$37,500 SBA-guaranteed Debentures, Issued September 2015 | SBIC I
Debt Instrument [Line Items]
Debenture Amount	$ 37,500
$37,500 SBA-guaranteed Debentures, Issued September 2015 | SBIC I | SBA-guaranteed debentures
Debt Instrument [Line Items]
Interest Rate	2.829%
SBA Annual Charge	0.355%
$28,795 SBA-guaranteed Debentures, Issued September 2015 | SBIC I
Debt Instrument [Line Items]
Debenture Amount	$ 28,795
$28,795 SBA-guaranteed Debentures, Issued September 2015 | SBIC I | SBA-guaranteed debentures
Debt Instrument [Line Items]
Interest Rate	2.829%
SBA Annual Charge	0.742%
$13,950 SBA-guaranteed debentures, Issued March 2016 | SBIC I
Debt Instrument [Line Items]
Debenture Amount	$ 13,950
$13,950 SBA-guaranteed debentures, Issued March 2016 | SBIC I | SBA-guaranteed debentures
Debt Instrument [Line Items]
Interest Rate	2.507%
SBA Annual Charge	0.742%
$4,000 SBA-guaranteed debentures, Issued September 2016 | SBIC I
Debt Instrument [Line Items]
Debenture Amount	$ 4,000
$4,000 SBA-guaranteed debentures, Issued September 2016 | SBIC I | SBA-guaranteed debentures
Debt Instrument [Line Items]
Interest Rate	2.051%
SBA Annual Charge	0.742%
$13,000 SBA-guaranteed debentures, Issued September 2017 | SBIC I
Debt Instrument [Line Items]
Debenture Amount	$ 13,000
$13,000 SBA-guaranteed debentures, Issued September 2017 | SBIC I | SBA-guaranteed debentures
Debt Instrument [Line Items]
Interest Rate	2.518%
SBA Annual Charge	0.742%
$15,255 SBA-guaranteed debentures, Issued March 2018 | SBIC I
Debt Instrument [Line Items]
Debenture Amount	$ 15,255
$15,255 SBA-guaranteed debentures, Issued March 2018 | SBIC I | SBA-guaranteed debentures
Debt Instrument [Line Items]
Interest Rate	3.187%
SBA Annual Charge	0.742%
$15,000 SBA-guaranteed debentures, Issued September 2018 | SBIC II
Debt Instrument [Line Items]
Debenture Amount	$ 15,000
$15,000 SBA-guaranteed debentures, Issued September 2018 | SBIC II | SBA-guaranteed debentures
Debt Instrument [Line Items]
Interest Rate	3.548%
SBA Annual Charge	0.222%
$19,000 SBA-guaranteed debentures, Issued September 2019 | SBIC II
Debt Instrument [Line Items]
Debenture Amount	$ 19,000
$19,000 SBA-guaranteed debentures, Issued September 2019 | SBIC II | SBA-guaranteed debentures
Debt Instrument [Line Items]
Interest Rate	2.283%
SBA Annual Charge	0.222%
$41,000 SBA-guaranteed debentures, Issued March 2020 | SBIC II
Debt Instrument [Line Items]
Debenture Amount	$ 41,000
$41,000 SBA-guaranteed debentures, Issued March 2020 | SBIC II | SBA-guaranteed debentures
Debt Instrument [Line Items]
Interest Rate	2.078%
SBA Annual Charge	0.222%
$24,000 SBA-guaranteed debentures, Issued March 2020 | SBIC II
Debt Instrument [Line Items]
Debenture Amount	$ 24,000
$24,000 SBA-guaranteed debentures, Issued March 2020 | SBIC II | SBA-guaranteed debentures
Debt Instrument [Line Items]
Interest Rate	2.078%
SBA Annual Charge	0.275%
$51,000 SBA-guaranteed debentures, Issued September 2020 | SBIC II
Debt Instrument [Line Items]
Debenture Amount	$ 51,000
$51,000 SBA-guaranteed debentures, Issued September 2020 | SBIC II | SBA-guaranteed debentures
Debt Instrument [Line Items]
Interest Rate	1.034%
SBA Annual Charge	0.275%