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Summary of Significant Accounting Policies - Narrative (Details)
 11 Months Ended 12 Months Ended
Mar. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2023
USD ($)
numberOfAgreement
Dec. 31, 2022
USD ($)
numberOfAgreement
Dec. 31, 2021
USD ($)
Feb. 04, 2016
USD ($)
Securities Financing Transaction [Line Items]            
Number of collateralized agreements | numberOfAgreement     1 1    
Cost basis of securities purchased under collateralized agreements to resell     $ 30,000,000 $ 30,000,000    
Fair value of securities purchased under collateralized agreements to resell     16,500,000 16,539,000    
Cash equivalents     0 0    
Investment income, interest, paid-in-kind     33,594,000 17,326,000 $ 23,343,000  
Investment income, dividend, paid-in-kind     $ 27,409,000 22,543,000 19,485,000  
Investments threshold period past due for nonaccrual status     30 days      
Income tax expense (benefit)     $ 1,762,000 9,299,000 232,000  
Current income tax expense     418,000 825,000 118,000  
Deferred income tax provision (benefit)     1,344,000 8,474,000 $ 114,000  
Deferred tax liability     $ 0 8,487,000    
Dividend reinvestment plan, share price percentage, threshold     110.00%      
Investments in Majority-owned Subsidiaries            
Securities Financing Transaction [Line Items]            
Shares redeemed for a promissory note (in shares) | shares 105,030          
Redemption of shares paid-in-kind $ 11,315,000          
Interest rate 7.00%          
Common Stock            
Securities Financing Transaction [Line Items]            
Stock repurchase program, authorized amount           $ 50,000,000
Common stock repurchased   $ 2,948,000 $ 0 $ 0    
Common Stock | NMNLC            
Securities Financing Transaction [Line Items]            
Sale of stock, number of shares issued (in shares) | shares 105,030          
Sale of stock, price per share (in dollars per share) | $ / shares $ 107.73          
Sale of stock, consideration received $ 11,315,000