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Borrowings - GCIC 2018 Debt Securitization - Narrative (Details) - GCIC 2018 Debt Securitization - USD ($)
$ in Thousands
9 Months Ended
Dec. 21, 2020
Jun. 30, 2026
Sep. 16, 2019
Dec. 13, 2018
Debt Instrument [Line Items]        
Debt instrument, face amount     $ 908,195  
Debt instrument, basis spread on variable rate   0.26161%    
Subordinated debt        
Debt Instrument [Line Items]        
Debt instrument, face amount       $ 179,695
AAA/AAA Class A-1 GCIC 2018 Notes        
Debt Instrument [Line Items]        
Debt instrument, face amount       490,000
AAA Class A-2 GCIC 2018 Notes        
Debt Instrument [Line Items]        
Debt instrument, face amount       38,500
AA Class B-1 GCIC 2018 Notes        
Debt Instrument [Line Items]        
Debt instrument, face amount       18,000
Class B-2 GCIC 2018 Notes        
Debt Instrument [Line Items]        
Debt instrument, received and retained, amount       27,000
Class C GCIC 2018 Notes        
Debt Instrument [Line Items]        
Debt instrument, received and retained, amount       95,000
Class D GCIC 2018 Notes        
Debt Instrument [Line Items]        
Debt instrument, received and retained, amount       $ 60,000
Class A-2-R GCIC 2018 Notes        
Debt Instrument [Line Items]        
Debt instrument, issued, principal $ 38,500      
Debt instrument, basis spread on variable rate 2.498%      
Class A-2 GCIC 2018 Notes        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate 4.665%