Quarterly report [Sections 13 or 15(d)]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 6 Months Ended
Jun. 30, 2025
Accounting Policies [Abstract]  
Schedule of Investment Income
A presentation of total investment income Main Street earned from its Investment Portfolio in each of the periods presented is as follows:
Three Months Ended
June 30,
Six Months Ended
June 30,
2025
2024
2025
2024
(dollars in thousands)
Interest, fee and dividend income:
Interest income $ 100,857  $ 100,031  $ 198,874  $ 200,136 
Dividend income 37,845  26,688  73,871  49,479 
Fee income 5,271  5,435  8,274  14,144 
Total investment income $ 143,973  $ 132,154  $ 281,019  $ 263,759