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Summary of Investments (Investments in Unrealized Loss Position) (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
issue
Dec. 31, 2020
USD ($)
issue
Number of Issues    
Less than 12 months | issue 98 46
12 months or longer | issue 2 8
Fair Value    
Less than 12 months $ 363,114 $ 256,247
12 months or longer 14 3,168
Total 363,128 259,415
Gross Unrealized Depreciation    
Less than 12 months 10,871 1,586
12 months or longer 0 8
Total $ 10,871 $ 1,594
U.S. Treasury    
Number of Issues    
Less than 12 months | issue 8 5
12 months or longer | issue 0 0
Fair Value    
Less than 12 months $ 62,122 $ 86,371
12 months or longer 0 0
Total 62,122 86,371
Gross Unrealized Depreciation    
Less than 12 months 505 25
12 months or longer 0 0
Total $ 505 $ 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 $ 27,391  
12 months or longer 0  
Total 27,391  
Gross Unrealized Depreciation    
Less than 12 months 2,258  
12 months or longer 0  
Total $ 2,258  
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 $ 1,176  
12 months or longer 0  
Total 1,176  
Gross Unrealized Depreciation    
Less than 12 months 98  
12 months or longer 0  
Total $ 98  
Foreign bonds    
Number of Issues    
Less than 12 months | issue 3 1
12 months or longer | issue 0 0
Fair Value    
Less than 12 months $ 5,770 $ 2,000
12 months or longer 0 0
Total 5,770 2,000
Gross Unrealized Depreciation    
Less than 12 months 134 2
12 months or longer 0 0
Total $ 134 $ 2
Public utilities    
Number of Issues    
Less than 12 months | issue 7  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 20,607  
12 months or longer 0  
Total 20,607  
Gross Unrealized Depreciation    
Less than 12 months 523  
12 months or longer 0  
Total $ 523  
Corporate bonds | Industrials    
Number of Issues    
Less than 12 months | issue 6  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 16,436  
12 months or longer 0  
Total 16,436  
Gross Unrealized Depreciation    
Less than 12 months 572  
12 months or longer 0  
Total $ 572  
Corporate bonds | Consumer goods and services    
Number of Issues    
Less than 12 months | issue 5  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 19,897  
12 months or longer 0  
Total 19,897  
Gross Unrealized Depreciation    
Less than 12 months 1,285  
12 months or longer 0  
Total $ 1,285  
Corporate bonds | Health care    
Number of Issues    
Less than 12 months | issue 5  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 21,508  
12 months or longer 0  
Total 21,508  
Gross Unrealized Depreciation    
Less than 12 months 1,188  
12 months or longer 0  
Total $ 1,188  
Corporate bonds | Technology, media and telecommunications    
Number of Issues    
Less than 12 months | issue 9 1
12 months or longer | issue 0 0
Fair Value    
Less than 12 months $ 24,792 $ 2,020
12 months or longer 0 0
Total 24,792 2,020
Gross Unrealized Depreciation    
Less than 12 months 1,956 15
12 months or longer 0 0
Total $ 1,956 $ 15
Corporate bonds | Financial services    
Number of Issues    
Less than 12 months | issue 6 1
12 months or longer | issue 0 1
Fair Value    
Less than 12 months $ 13,262 $ 2,995
12 months or longer 0 3,000
Total 13,262 5,995
Gross Unrealized Depreciation    
Less than 12 months 231 5
12 months or longer 0 7
Total $ 231 $ 12
Mortgage-backed securities    
Number of Issues    
Less than 12 months | issue 7 2
12 months or longer | issue 2 5
Fair Value    
Less than 12 months $ 17,126 $ 8,099
12 months or longer 14 118
Total 17,140 8,217
Gross Unrealized Depreciation    
Less than 12 months 143 53
12 months or longer 0 1
Total $ 143 $ 54
Collateralized mortgage obligations | Federal home loan mortgage corporation    
Number of Issues    
Less than 12 months | issue 24 24
12 months or longer | issue 0 1
Fair Value    
Less than 12 months $ 90,493 $ 97,691
12 months or longer 0 26
Total 90,493 97,717
Gross Unrealized Depreciation    
Less than 12 months 1,402 758
12 months or longer 0 0
Total $ 1,402 $ 758
Collateralized mortgage obligations | Federal national mortgage association    
Number of Issues    
Less than 12 months | issue 9 10
12 months or longer | issue 0 0
Fair Value    
Less than 12 months $ 26,987 $ 44,677
12 months or longer 0 0
Total 26,987 44,677
Gross Unrealized Depreciation    
Less than 12 months 463 683
12 months or longer 0 0
Total $ 463 $ 683
Collateralized mortgage obligations | Government national mortgage association    
Number of Issues    
Less than 12 months | issue 4 2
12 months or longer | issue 0 1
Fair Value    
Less than 12 months $ 15,547 $ 12,394
12 months or longer 0 24
Total 15,547 12,418
Gross Unrealized Depreciation    
Less than 12 months 113 45
12 months or longer 0 0
Total $ 113 $ 45