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Investments (Narrative) (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
business
security
issuer
investment
partnership
Jun. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
business
security
issuer
investment
partnership
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
security
issuer
Reclassifications from AOCI to net income (loss):            
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 $ 54,800,000     $ 54,800,000    
Business owned life insurance cost 43,000,000     43,000,000    
Investment in unconsolidated subsidiaries $ 317,869,000     $ 317,869,000   $ 310,529,000
Number of LPs / LLCs with investment ownership percent over 25% (in businesses) | business 4     4    
Portion of impairment losses recognized in other comprehensive income (loss) before taxes $ 0   $ 0 $ 0 $ 237,000  
Net impairment losses recognized in earnings 0   0 0 1,508,000  
Net realized investment (losses) gains 530,000   $ 8,838,000 20,212,000 $ 150,000  
Tax Credit Partnership Investment Tax Credit Carryforward | Tax Year 2020            
Reclassifications from AOCI to net income (loss):            
Deferred tax credit for partnership investments $ 3,100,000     $ 9,900,000    
Tax Credit Partnerships Almost 100% Ownership            
Reclassifications from AOCI to net income (loss):            
Number of tax credit partnerships almost 100% ownership percentage | partnership 2     2    
Investment in unconsolidated subsidiaries $ 4,900,000     $ 4,900,000   9,400,000
Tax Credit Partnerships Almost 100% Ownership | Maximum            
Reclassifications from AOCI to net income (loss):            
Investment ownership percentage 100.00%     100.00%    
Tax Credit Partnerships Less Than 20% Ownership            
Reclassifications from AOCI to net income (loss):            
Investment in unconsolidated subsidiaries $ 11,100,000     $ 11,100,000   18,300,000
Tax Credit Partnerships Less Than 20% Ownership | Maximum            
Reclassifications from AOCI to net income (loss):            
Investment ownership percentage 20.00%     20.00%    
Other Limited Partnerships and Limited Liability Company, Greater Than 25% Ownership            
Reclassifications from AOCI to net income (loss):            
Investment ownership percentage 25.00%     25.00%    
Investment in unconsolidated subsidiaries $ 49,200,000     $ 49,200,000   46,200,000
Other Limited Partnerships and Limited Liability Company Less than 25% Ownership            
Reclassifications from AOCI to net income (loss):            
Investment in unconsolidated subsidiaries 252,700,000     252,700,000   $ 236,600,000
NORCAL Group            
Reclassifications from AOCI to net income (loss):            
Business owned life insurance cost $ 10,000,000     $ 10,000,000    
Syndicate 1729            
Reclassifications from AOCI to net income (loss):            
Return of deposit assets   $ 24,500,000        
Proportion of capital provided to support Lloyd's Syndicate 5.00%     5.00%   29.00%
Syndicate 6131            
Reclassifications from AOCI to net income (loss):            
Proportion of capital provided to support Lloyd's Syndicate 50.00%     50.00%   100.00%
Fixed maturities            
Reclassifications from AOCI to net income (loss):            
Required FAL deposit $ 64,300,000     $ 64,300,000    
Cash and cash equivalents            
Reclassifications from AOCI to net income (loss):            
Required FAL deposit $ 8,200,000     $ 8,200,000    
Non government-backed            
Reclassifications from AOCI to net income (loss):            
Debt securities in unrealized loss position (in securities) | security 1,246     1,246   292
Debt securities in unrealized loss position as percentage of total debt securities held 32.30%     32.30%   11.10%
Issuers in unrealized loss position (in issuers) | issuer 768     768   229
Single greatest unrealized loss position $ 300,000     $ 300,000   $ 400,000
Second greatest unrealized loss position $ 200,000     $ 200,000   $ 200,000