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Investments (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
partnership
security
business
investment
issuer
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
partnership
security
business
investment
issuer
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
security
issuer
partnership
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 $ 53,800   $ 53,800    
FAL Deposit return by cash 5,500   5,500    
Business owned life insurance cost 42,000   42,000    
Investment in unconsolidated subsidiaries $ 321,912   $ 321,912   $ 335,576
Number of LPs / LLCs with investment ownership percent over 25% (in businesses) | business 4   4    
Impairment losses $ 972 $ 0 $ 972 $ 0  
Portion of impairment losses recognized in other comprehensive income (loss) before taxes 419 0 419 0  
Asset Pledged as Collateral          
Reclassifications from AOCI to net income (loss):          
Securities on deposit with state insurance departments 33,300   33,300    
Tax Year 2019          
Reclassifications from AOCI to net income (loss):          
Tax credit for partnership investments 2,000        
Tax Year 2039          
Reclassifications from AOCI to net income (loss):          
Tax credit carryforwards 51,100   51,100    
Tax Credit Partnership Investment Tax Credit Carryforward | Tax Year 2020          
Reclassifications from AOCI to net income (loss):          
Tax credit for partnership investments $ 1,200 $ 3,400 $ 2,400 $ 6,800  
Tax Credit Partnerships Almost 100% Ownership          
Reclassifications from AOCI to net income (loss):          
Number of tax credit partnerships almost 100% ownership percentage | partnership 1   1   2
Investment in unconsolidated subsidiaries $ 900   $ 900   $ 3,200
Tax Credit Partnerships Almost 100% Ownership | Maximum          
Reclassifications from AOCI to net income (loss):          
Investment ownership percentage 100.00%   100.00%   100.00%
Tax Credit Partnerships Less Than 20% Ownership          
Reclassifications from AOCI to net income (loss):          
Investment in unconsolidated subsidiaries $ 6,300   $ 6,300   $ 9,200
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 $ 49,500   $ 49,500   49,000
Other Limited Partnerships and Limited Liability Company Less than 25% Ownership          
Reclassifications from AOCI to net income (loss):          
Investment in unconsolidated subsidiaries 265,200   265,200   $ 274,200
NORCAL Group          
Reclassifications from AOCI to net income (loss):          
Business owned life insurance cost 10,000   10,000    
Fixed maturities          
Reclassifications from AOCI to net income (loss):          
Required FAL deposit 30,000   30,000    
Cash and cash equivalents          
Reclassifications from AOCI to net income (loss):          
Required FAL deposit $ 300   $ 300    
Non government-backed          
Reclassifications from AOCI to net income (loss):          
Debt securities in unrealized loss position (in securities) | security 2,812   2,812   1,766
Debt securities in unrealized loss position as percentage of total debt securities held 72.30%   72.30%   45.80%
Issuers in unrealized loss position (in issuers) | issuer 1,395   1,395   998
Single greatest unrealized loss position $ 3,700   $ 3,700   $ 400
Second greatest unrealized loss position $ 3,500   $ 3,500