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Borrowings - Summary of SBA-Guaranteed Debentures (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Debt Instrument [Line Items]  
Debenture Amount $ 196,205
$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%