Quarterly report pursuant to Section 13 or 15(d)

SHARE-BASED COMPENSATION - Narrative (Details)

v3.23.3
SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Share‑based compensation $ 4,164 $ 3,617 $ 12,351 $ 10,031
Share-based payment arrangement, nonvested award, vested fair value     $ 15,600 10,500
Restricted Stock        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Vesting period (in years)     3 years  
Share‑based compensation 4,200 $ 3,600 $ 12,400 $ 10,000
Share-based payment arrangement, nonvested award, excluding option, cost not yet recognized, amount $ 34,400   $ 34,400  
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition (in years)     2 years 8 months 12 days  
Restricted Stock | Main Street Capital Corporation 2022 Equity and Incentive Plan        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Vesting period (in years)     3 years