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Investments - Security Holdings in an Unrealized Loss Position - Tabular Disclosure (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value    
Fair Value - Less Than 12 Months $ 103,657 $ 40,826
Fair Value - More Than 12 Months 8,621 699
Fair Value - Total 112,278 41,525
Unrealized Losses    
Unrealized Losses - Less Than 12 Months (1,275) (452)
Unrealized Losses - More Than 12 Months (365) (61)
Unrealized Losses - Total (1,640) (513)
U.S. Governments    
Fair Value    
Fair Value - Less Than 12 Months 7,018 1,496
Fair Value - More Than 12 Months 490  
Fair Value - Total 7,508 1,496
Unrealized Losses    
Unrealized Losses - Less Than 12 Months (105) (5)
Unrealized Losses - More Than 12 Months (10)  
Unrealized Losses - Total (115) (5)
States, territories, and possessions    
Fair Value    
Fair Value - Less Than 12 Months 3,236  
Fair Value - Total 3,236  
Unrealized Losses    
Unrealized Losses - Less Than 12 Months (118)  
Unrealized Losses - Total (118)  
Special revenue excluding mortgage/asset-backed securities    
Fair Value    
Fair Value - Less Than 12 Months 13,593 520
Fair Value - Total 13,593 520
Unrealized Losses    
Unrealized Losses - Less Than 12 Months (174) (2)
Unrealized Losses - Total (174) (2)
Corporate and other    
Fair Value    
Fair Value - Less Than 12 Months 70,182 22,718
Fair Value - More Than 12 Months 5,688 203
Fair Value - Total 75,870 22,921
Unrealized Losses    
Unrealized Losses - Less Than 12 Months (799) (234)
Unrealized Losses - More Than 12 Months (332) (57)
Unrealized Losses - Total (1,131) (291)
Mortgage/asset-backed securities    
Fair Value    
Fair Value - Less Than 12 Months 9,628 16,092
Fair Value - More Than 12 Months 2,443 496
Fair Value - Total 12,071 16,588
Unrealized Losses    
Unrealized Losses - Less Than 12 Months (79) (211)
Unrealized Losses - More Than 12 Months (23) (4)
Unrealized Losses - Total $ (102) $ (215)