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Investments (Narrative) (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
issuer
security
business
investment
bonds
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
issuer
security
business
investment
bonds
Sep. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
security
business
issuer
Debt Securities, Available-for-Sale [Line Items]            
Number of investment in any entity or affiliates greater than 10% of stockholders' equity | investment 0   0      
Threshold limit of investments based on shareholders' equity 10.00%   10.00%      
Securities on deposit with state insurance departments $ 53,700,000   $ 53,700,000      
FAL deposit return by cash         $ 4,100,000  
Investment in unconsolidated subsidiaries $ 297,314,000   $ 297,314,000     $ 305,210,000
Number of LPs / LLCs with investment ownership percent over 25% (in businesses) | business 4   4     3
Tax credits recognized $ 401,000 $ 1,201,000 $ 473,000 $ 3,604,000    
Net impairment losses recognized in earnings $ (141,000) 0 $ (3,117,000) (553,000)    
Number of corporate bonds | bonds 2   2      
Portion of impairment losses recognized in other comprehensive income (loss) before taxes $ 0 0 $ 0 419,000    
Asset Pledged as Collateral            
Debt Securities, Available-for-Sale [Line Items]            
Securities on deposit with state insurance departments 69,200,000   69,200,000      
Tax Year 2019            
Debt Securities, Available-for-Sale [Line Items]            
Tax credit partnership investments     2,200,000      
Tax Year 2039            
Debt Securities, Available-for-Sale [Line Items]            
Tax credit carryforwards 53,400,000   53,400,000      
Tax Credit Partnership Investment Tax Credit Carryforward | Tax Year 2020            
Debt Securities, Available-for-Sale [Line Items]            
Tax credit partnership investments   $ 1,200,000   $ 3,600,000    
Tax Credit Partnerships Less Than 20% Ownership            
Debt Securities, Available-for-Sale [Line Items]            
Investment in unconsolidated subsidiaries $ 800,000   $ 800,000     $ 4,100,000
Tax Credit Partnerships Less Than 20% Ownership | Maximum            
Debt Securities, Available-for-Sale [Line Items]            
Investment ownership percentage 20.00%   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%   25.00%      
Investment in unconsolidated subsidiaries $ 45,000,000   $ 45,000,000     36,000,000
Other Limited Partnerships and Limited Liability Company Less than 25% Ownership            
Debt Securities, Available-for-Sale [Line Items]            
Investment in unconsolidated subsidiaries $ 251,500,000   $ 251,500,000     $ 265,100,000
Non government-backed            
Debt Securities, Available-for-Sale [Line Items]            
Debt securities in unrealized loss position (in securities) | security 2,829   2,829     2,901
Debt securities in unrealized loss position as percentage of total debt securities held 73.30%   73.30%     74.40%
Issuers in unrealized loss position (in issuers) | issuer 1,396   1,396     1,433
Single greatest unrealized loss position $ 6,000,000   $ 6,000,000     $ 5,700,000
Second greatest unrealized loss position $ 4,100,000   $ 4,100,000     $ 4,100,000