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Summary of Investments (Investments in Unrealized Loss Position) (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
issue
Dec. 31, 2019
USD ($)
issue
Number of Issues    
Less than 12 months | issue 31 24
12 months or longer | issue 9 27
Fair Value    
Less than 12 months $ 120,638 $ 107,540
12 months or longer 3,290 20,230
Total 123,928 127,770
Gross Unrealized Depreciation    
Less than 12 months 1,113 557
12 months or longer 13 235
Total $ 1,126 $ 792
U.S. Treasury    
Number of Issues    
Less than 12 months | issue 2 0
12 months or longer | issue 0 2
Fair Value    
Less than 12 months $ 11,804 $ 0
12 months or longer 0 4,733
Total 11,804 4,733
Gross Unrealized Depreciation    
Less than 12 months 8 0
12 months or longer 0 12
Total $ 8 $ 12
Foreign bonds    
Number of Issues    
Less than 12 months | issue 1  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 2,776  
12 months or longer 0  
Total 2,776  
Gross Unrealized Depreciation    
Less than 12 months 230  
12 months or longer 0  
Total $ 230  
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
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 $ 2,196  
12 months or longer 0  
Total 2,196  
Gross Unrealized Depreciation    
Less than 12 months 12  
12 months or longer 0  
Total $ 12  
Corporate bonds | Financial services    
Number of Issues    
Less than 12 months | issue 1 3
12 months or longer | issue 1 1
Fair Value    
Less than 12 months $ 2,998 $ 10,906
12 months or longer 3,000 4,913
Total 5,998 15,819
Gross Unrealized Depreciation    
Less than 12 months 2 142
12 months or longer 9 88
Total $ 11 $ 230
Mortgage-backed securities    
Number of Issues    
Less than 12 months | issue 2 0
12 months or longer | issue 6 13
Fair Value    
Less than 12 months $ 9,118 $ 0
12 months or longer 157 1,585
Total 9,275 1,585
Gross Unrealized Depreciation    
Less than 12 months 107 0
12 months or longer 2 21
Total $ 109 $ 21
Collateralized mortgage obligations | Federal home loan mortgage corporation    
Number of Issues    
Less than 12 months | issue 14 12
12 months or longer | issue 1 3
Fair Value    
Less than 12 months $ 48,062 $ 50,829
12 months or longer 57 4,844
Total 48,119 55,673
Gross Unrealized Depreciation    
Less than 12 months 348 183
12 months or longer 1 37
Total $ 349 $ 220
Collateralized mortgage obligations | Federal national mortgage association    
Number of Issues    
Less than 12 months | issue 10 4
12 months or longer | issue 0 3
Fair Value    
Less than 12 months $ 43,684 $ 23,515
12 months or longer 0 1,102
Total 43,684 24,617
Gross Unrealized Depreciation    
Less than 12 months 406 90
12 months or longer 0 18
Total $ 406 $ 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 76 3,053
Total 76 11,497
Gross Unrealized Depreciation    
Less than 12 months 0 38
12 months or longer 1 59
Total $ 1 $ 97