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Borrowings - SBA-guaranteed Debentures, Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
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 $ 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                  
Interest rate margin 0.41%