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Investments (Narrative) (Details)
 3 Months Ended
Mar. 31, 2024
USD ($)
investment
security
issuer
business
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
security
issuer
Debt Securities, Available-for-Sale [Line Items]      
Number of investment in any entity or affiliates greater than 10% of stockholders' equity | investment 0    
Threshold limit of investments based on shareholders' equity 10.00%    
Securities on deposit with state insurance departments $ 53,500,000    
Number of LPs / LLCs with investment ownership percent over 25% (in businesses) | business 4    
Investment in unconsolidated subsidiaries $ 278,931,000   $ 276,756,000
Net impairment losses recognized in earnings (934,000) $ (2,933,000)  
Portion of impairment losses recognized in other comprehensive income (loss) before taxes 576,000 $ 0  
Asset Pledged as Collateral      
Debt Securities, Available-for-Sale [Line Items]      
Securities on deposit with state insurance departments 70,600,000    
Tax Year 2019      
Debt Securities, Available-for-Sale [Line Items]      
Tax credit carryforwards $ 52,700,000    
Tax Credit Partnerships Less Than 20% Ownership | Maximum      
Debt Securities, Available-for-Sale [Line Items]      
Investment ownership percentage 20.00%    
Other Limited Partnerships and Limited Liability Company, Greater Than 25% Ownership      
Debt Securities, Available-for-Sale [Line Items]      
Investment ownership percentage 25.00%    
Investment in unconsolidated subsidiaries $ 24,000,000   23,000,000
Other Limited Partnerships and Limited Liability Company Less than 25% Ownership      
Debt Securities, Available-for-Sale [Line Items]      
Investment in unconsolidated subsidiaries $ 254,400,000   $ 253,100,000
Non government-backed      
Debt Securities, Available-for-Sale [Line Items]      
Debt securities in unrealized loss position (in securities) | security 2,545   2,531
Debt securities in unrealized loss position as percentage of total debt securities held 64.80%   65.60%
Issuers in unrealized loss position (in issuers) | issuer 1,328   1,319
Single greatest unrealized loss position $ 5,300,000   $ 5,000,000
Second greatest unrealized loss position $ 3,300,000   $ 3,200,000