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Borrowings - SBA-guaranteed Debentures, Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]                  
SBA-guaranteed debentures outstanding $ 300,000 $ 300,000 $ 300,000 $ 225,000 $ 165,000 $ 150,000 $ 121,700 $ 117,700 $ 37,500
Upfront fees percentage 0.03435                
Commitment fee percentage 0.0100                
Issuance discount percentage 0.02435                
SBIC I                  
Debt Instrument [Line Items]                  
Regulatory capital $ 75,000 75,000              
SBA-guaranteed debentures outstanding 150,000 150,000              
SBIC II                  
Debt Instrument [Line Items]                  
Regulatory capital 75,000 75,000              
SBA-guaranteed debentures outstanding $ 150,000 $ 150,000              
SBA-guaranteed debentures                  
Debt Instrument [Line Items]                  
Term of debt 10 years                
SBA-guaranteed debentures | LIBOR                  
Debt Instrument [Line Items]                  
Interest rate margin 0.30%