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Summary of Investments (Investments in Unrealized Loss Position) (Details)
$ in Thousands
Jun. 30, 2020
USD ($)
issue
Dec. 31, 2019
USD ($)
issue
Number of Issues    
Less than 12 months | issue 20 24
12 months or longer | issue 9 27
Fair Value    
Less than 12 months $ 51,867 $ 107,540
12 months or longer 422 20,230
Total 52,289 127,770
Gross Unrealized Depreciation    
Less than 12 months 471 557
12 months or longer 4 235
Total $ 475 $ 792
U.S. Treasury    
Number of Issues    
Less than 12 months | issue   0
12 months or longer | issue   2
Fair Value    
Less than 12 months   $ 0
12 months or longer   4,733
Total   4,733
Gross Unrealized Depreciation    
Less than 12 months   0
12 months or longer   12
Total   $ 12
U.S. government agency    
Number of Issues    
Less than 12 months | issue   3
12 months or longer | issue   0
Fair Value    
Less than 12 months   $ 13,846
12 months or longer   0
Total   13,846
Gross Unrealized Depreciation    
Less than 12 months   104
12 months or longer   0
Total   $ 104
Foreign bonds    
Number of Issues    
Less than 12 months | issue 1  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 2,900  
12 months or longer 0  
Total 2,900  
Gross Unrealized Depreciation    
Less than 12 months 106  
12 months or longer 0  
Total $ 106  
Corporate bonds | Energy    
Number of Issues    
Less than 12 months | issue 1  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 451  
12 months or longer 0  
Total 451  
Gross Unrealized Depreciation    
Less than 12 months 11  
12 months or longer 0  
Total $ 11  
Corporate bonds | Consumer goods and services    
Number of Issues    
Less than 12 months | issue 1  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 3,090  
12 months or longer 0  
Total 3,090  
Gross Unrealized Depreciation    
Less than 12 months 52  
12 months or longer 0  
Total $ 52  
Corporate bonds | Financial services    
Number of Issues    
Less than 12 months | issue 1 3
12 months or longer | issue 0 1
Fair Value    
Less than 12 months $ 2,985 $ 10,906
12 months or longer 0 4,913
Total 2,985 15,819
Gross Unrealized Depreciation    
Less than 12 months 60 142
12 months or longer 0 88
Total $ 60 $ 230
Mortgage-backed securities    
Number of Issues    
Less than 12 months | issue 0 0
12 months or longer | issue 7 13
Fair Value    
Less than 12 months $ 0 $ 0
12 months or longer 188 1,585
Total 188 1,585
Gross Unrealized Depreciation    
Less than 12 months 0 0
12 months or longer 2 21
Total $ 2 $ 21
Collateralized mortgage obligations | Federal home loan mortgage corporation    
Number of Issues    
Less than 12 months | issue 12 12
12 months or longer | issue 1 3
Fair Value    
Less than 12 months $ 24,455 $ 50,829
12 months or longer 89 4,844
Total 24,544 55,673
Gross Unrealized Depreciation    
Less than 12 months 160 183
12 months or longer 1 37
Total $ 160 $ 220
Collateralized mortgage obligations | Federal national mortgage association    
Number of Issues    
Less than 12 months | issue 4 4
12 months or longer | issue 0 3
Fair Value    
Less than 12 months $ 17,986 $ 23,515
12 months or longer 0 1,102
Total 17,986 24,617
Gross Unrealized Depreciation    
Less than 12 months 83 90
12 months or longer 0 18
Total $ 83 $ 108
Collateralized mortgage obligations | Government national mortgage association    
Number of Issues    
Less than 12 months | issue 0 2
12 months or longer | issue 1 5
Fair Value    
Less than 12 months $ 0 $ 8,444
12 months or longer 145 3,053
Total 145 11,497
Gross Unrealized Depreciation    
Less than 12 months 0 38
12 months or longer 1 59
Total $ 1 $ 97