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Summary of Investments - Investments in Unrealized Loss Position (Details)
$ in Thousands
Jun. 30, 2021
USD ($)
issue
Dec. 31, 2020
USD ($)
issue
Number of Issues    
Less than 12 months | issue 77 46
12 months or longer | issue 2 8
Fair Value    
Less than 12 months $ 293,498 $ 256,247
12 months or longer 2,239 3,168
Total 295,737 259,415
Gross Unrealized Depreciation    
Less than 12 months 5,858 1,586
12 months or longer 34 8
Total $ 5,892 $ 1,594
U.S. Treasury    
Number of Issues    
Less than 12 months | issue 7 5
12 months or longer | issue 0 0
Fair Value    
Less than 12 months $ 45,079 $ 86,371
12 months or longer 0 0
Total 45,079 86,371
Gross Unrealized Depreciation    
Less than 12 months 420 25
12 months or longer 0 0
Total $ 420 $ 25
U.S. government agency    
Number of Issues    
Less than 12 months | issue 4  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 28,498  
12 months or longer 0  
Total 28,498  
Gross Unrealized Depreciation    
Less than 12 months 1,071  
12 months or longer 0  
Total $ 1,071  
States, municipalities and political subdivisions | General obligations | South    
Number of Issues    
Less than 12 months | issue 1  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 1,224  
12 months or longer 0  
Total 1,224  
Gross Unrealized Depreciation    
Less than 12 months 49  
12 months or longer 0  
Total $ 49  
Foreign bonds    
Number of Issues    
Less than 12 months | issue 2 1
12 months or longer | issue 0 0
Fair Value    
Less than 12 months $ 2,930 $ 2,000
12 months or longer 0 0
Total 2,930 2,000
Gross Unrealized Depreciation    
Less than 12 months 73 2
12 months or longer 0 0
Total $ 73 $ 2
Public utilities    
Number of Issues    
Less than 12 months | issue 5  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 13,513  
12 months or longer 0  
Total 13,513  
Gross Unrealized Depreciation    
Less than 12 months 88  
12 months or longer 0  
Total $ 88  
Corporate bonds | Industrials    
Number of Issues    
Less than 12 months | issue 2  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 5,977  
12 months or longer 0  
Total 5,977  
Gross Unrealized Depreciation    
Less than 12 months 76  
12 months or longer 0  
Total $ 76  
Corporate bonds | Consumer goods and services    
Number of Issues    
Less than 12 months | issue 6  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 16,690  
12 months or longer 0  
Total 16,690  
Gross Unrealized Depreciation    
Less than 12 months 434  
12 months or longer 0  
Total $ 434  
Corporate bonds | Health care    
Number of Issues    
Less than 12 months | issue 2  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 18,936  
12 months or longer 0  
Total 18,936  
Gross Unrealized Depreciation    
Less than 12 months 302  
12 months or longer 0  
Total $ 302  
Corporate bonds | Technology, media and telecommunications    
Number of Issues    
Less than 12 months | issue 5 1
12 months or longer | issue 0 0
Fair Value    
Less than 12 months $ 16,198 $ 2,020
12 months or longer 0 0
Total 16,198 2,020
Gross Unrealized Depreciation    
Less than 12 months 853 15
12 months or longer 0 0
Total $ 853 $ 15
Corporate bonds | Financial services    
Number of Issues    
Less than 12 months | issue 3 1
12 months or longer | issue 0 1
Fair Value    
Less than 12 months $ 6,497 $ 2,995
12 months or longer 0 3,000
Total 6,497 5,995
Gross Unrealized Depreciation    
Less than 12 months 26 5
12 months or longer 0 7
Total $ 26 $ 12
Mortgage-backed securities    
Number of Issues    
Less than 12 months | issue 6 2
12 months or longer | issue 0 5
Fair Value    
Less than 12 months $ 16,879 $ 8,099
12 months or longer 0 118
Total 16,879 8,217
Gross Unrealized Depreciation    
Less than 12 months 163 53
12 months or longer 0 1
Total $ 163 $ 54
Collateralized mortgage obligations | Federal home loan mortgage corporation    
Number of Issues    
Less than 12 months | issue 21 24
12 months or longer | issue 1 1
Fair Value    
Less than 12 months $ 82,021 $ 97,691
12 months or longer 880 26
Total 82,901 97,717
Gross Unrealized Depreciation    
Less than 12 months 1,076 758
12 months or longer 10 0
Total $ 1,086 $ 758
Collateralized mortgage obligations | Federal national mortgage association    
Number of Issues    
Less than 12 months | issue 8 10
12 months or longer | issue 1 0
Fair Value    
Less than 12 months $ 16,727 $ 44,677
12 months or longer 1,359 0
Total 18,086 44,677
Gross Unrealized Depreciation    
Less than 12 months 162 683
12 months or longer 24 0
Total $ 186 $ 683
Collateralized mortgage obligations | Government national mortgage association    
Number of Issues    
Less than 12 months | issue 5 2
12 months or longer | issue 0 1
Fair Value    
Less than 12 months $ 22,329 $ 12,394
12 months or longer 0 24
Total 22,329 12,418
Gross Unrealized Depreciation    
Less than 12 months 1,065 45
12 months or longer 0 0
Total $ 1,065 $ 45