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Debt - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 10, 2021
Oct. 02, 2013
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]          
Current portion of long-term debt     $ 199,863    
Interest paid     $ 7,700 $ 7,300 $ 7,300
Average interest rate on debt (as a percent)     3.89% 4.77% 4.91%
FHLBC | RLI Ins.          
Debt Instrument [Line Items]          
Debt instrument maturity date Nov. 10, 2023        
Amount borrowed from FHLB $ 50,000        
Interest paid monthly at an annualized rate 0.84%        
Frequency of interest payment     monthly    
Senior Notes Maturing September 15, 2023          
Debt Instrument [Line Items]          
Issue of senior notes by public debt offering   $ 150,000      
Debt instrument maturity date   Sep. 15, 2023      
Stated interest rate, payable semi-annually (as a percent)   4.875%      
Proceeds from issuance of debt, net of discount and commission   $ 148,600      
Estimated fair value of senior notes     $ 149,900    
Long-term debt     149,900    
Line of Credit          
Debt Instrument [Line Items]          
Borrowing capacity under revolving line of credit facility     60,000   $ 50,000
Maximum borrowing capacity conditional expansion     $ 120,000    
Term of facility     3 years    
Line of credit facility expiration date     Mar. 27, 2023    
Amount outstanding on this facility     $ 0 $ 0 $ 0