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Summary of Investments (Investments in Unrealized Loss Position) (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
issue
Dec. 31, 2018
USD ($)
issue
Number of Issues    
Less than 12 months (issues) | issue 3 118
12 months or longer (issues) | issue 67 291
Fair Value    
Less than 12 months $ 12,687 $ 207,671
12 months or longer 92,570 698,835
Total 105,257 906,506
Gross Unrealized Depreciation    
Less than 12 months 319 3,067
12 months or longer 744 20,578
Total $ 1,063 $ 23,645
U.S. Treasury    
Number of Issues    
Less than 12 months (issues) | issue 0 1
12 months or longer (issues) | issue 3 5
Fair Value    
Less than 12 months $ 0 $ 8,018
12 months or longer 8,737 14,645
Total 8,737 22,663
Gross Unrealized Depreciation    
Less than 12 months 0 7
12 months or longer 42 213
Total $ 42 $ 220
U.S. government agency    
Number of Issues    
Less than 12 months (issues) | issue 0 4
12 months or longer (issues) | issue 2 17
Fair Value    
Less than 12 months $ 0 $ 17,907
12 months or longer 7,959 80,696
Total 7,959 98,603
Gross Unrealized Depreciation    
Less than 12 months 0 81
12 months or longer 41 1,668
Total $ 41 $ 1,749
States, municipalities and political subdivisions | General obligations | Midwest    
Number of Issues    
Less than 12 months (issues) | issue 0 2
12 months or longer (issues) | issue 0 7
Fair Value    
Less than 12 months $ 0 $ 2,939
12 months or longer 0 23,749
Total 0 26,688
Gross Unrealized Depreciation    
Less than 12 months 0 5
12 months or longer 0 680
Total $ 0 $ 685
States, municipalities and political subdivisions | General obligations | Northeast    
Number of Issues    
Less than 12 months (issues) | issue   0
12 months or longer (issues) | issue   3
Fair Value    
Less than 12 months   $ 0
12 months or longer   12,110
Total   12,110
Gross Unrealized Depreciation    
Less than 12 months   0
12 months or longer   103
Total   $ 103
States, municipalities and political subdivisions | General obligations | South    
Number of Issues    
Less than 12 months (issues) | issue 0 1
12 months or longer (issues) | issue 3 22
Fair Value    
Less than 12 months $ 0 $ 778
12 months or longer 9,519 50,174
Total 9,519 50,952
Gross Unrealized Depreciation    
Less than 12 months 0 2
12 months or longer 71 1,551
Total $ 71 $ 1,553
States, municipalities and political subdivisions | General obligations | West    
Number of Issues    
Less than 12 months (issues) | issue 0 1
12 months or longer (issues) | issue 1 16
Fair Value    
Less than 12 months $ 0 $ 1,203
12 months or longer 2,086 48,499
Total 2,086 49,702
Gross Unrealized Depreciation    
Less than 12 months 0 5
12 months or longer 12 1,170
Total $ 12 $ 1,175
States, municipalities and political subdivisions | Special revenue | Midwest    
Number of Issues    
Less than 12 months (issues) | issue 0 4
12 months or longer (issues) | issue 2 19
Fair Value    
Less than 12 months $ 0 $ 3,892
12 months or longer 3,339 43,854
Total 3,339 47,746
Gross Unrealized Depreciation    
Less than 12 months 0 8
12 months or longer 9 862
Total $ 9 $ 870
States, municipalities and political subdivisions | Special revenue | Northeast    
Number of Issues    
Less than 12 months (issues) | issue 0 0
12 months or longer (issues) | issue 1 14
Fair Value    
Less than 12 months $ 0 $ 0
12 months or longer 1,296 37,629
Total 1,296 37,629
Gross Unrealized Depreciation    
Less than 12 months 0 0
12 months or longer 0 1,241
Total $ 0 $ 1,241
States, municipalities and political subdivisions | Special revenue | South    
Number of Issues    
Less than 12 months (issues) | issue 0 4
12 months or longer (issues) | issue 6 45
Fair Value    
Less than 12 months $ 0 $ 4,298
12 months or longer 14,039 107,016
Total 14,039 111,314
Gross Unrealized Depreciation    
Less than 12 months 0 30
12 months or longer 98 3,678
Total $ 98 $ 3,708
States, municipalities and political subdivisions | Special revenue | West    
Number of Issues    
Less than 12 months (issues) | issue 0 4
12 months or longer (issues) | issue 4 28
Fair Value    
Less than 12 months $ 0 $ 11,115
12 months or longer 4,115 69,667
Total 4,115 80,782
Gross Unrealized Depreciation    
Less than 12 months 0 32
12 months or longer 8 2,171
Total $ 8 $ 2,203
Foreign bonds    
Number of Issues    
Less than 12 months (issues) | issue   1
12 months or longer (issues) | issue   0
Fair Value    
Less than 12 months   $ 2,984
12 months or longer   0
Total   2,984
Gross Unrealized Depreciation    
Less than 12 months   13
12 months or longer   0
Total   $ 13
Public utilities    
Number of Issues    
Less than 12 months (issues) | issue 1 12
12 months or longer (issues) | issue 0 8
Fair Value    
Less than 12 months $ 2,934 $ 25,781
12 months or longer 0 17,253
Total 2,934 43,034
Gross Unrealized Depreciation    
Less than 12 months 62 552
12 months or longer 0 471
Total $ 62 $ 1,023
Corporate bonds | Energy    
Number of Issues    
Less than 12 months (issues) | issue 0 7
12 months or longer (issues) | issue 0 2
Fair Value    
Less than 12 months $ 0 $ 12,556
12 months or longer 0 4,099
Total 0 16,655
Gross Unrealized Depreciation    
Less than 12 months 0 148
12 months or longer 0 156
Total $ 0 $ 304
Corporate bonds | Industrials    
Number of Issues    
Less than 12 months (issues) | issue 1 9
12 months or longer (issues) | issue 1 4
Fair Value    
Less than 12 months $ 5,009 $ 21,970
12 months or longer 3,996 11,040
Total 9,005 33,010
Gross Unrealized Depreciation    
Less than 12 months 1 397
12 months or longer 42 509
Total $ 43 $ 906
Corporate bonds | Consumer goods and services    
Number of Issues    
Less than 12 months (issues) | issue 0 14
12 months or longer (issues) | issue 3 5
Fair Value    
Less than 12 months $ 0 $ 30,399
12 months or longer 4,637 9,554
Total 4,637 39,953
Gross Unrealized Depreciation    
Less than 12 months 0 527
12 months or longer 73 292
Total $ 73 $ 819
Corporate bonds | Health care    
Number of Issues    
Less than 12 months (issues) | issue 0 3
12 months or longer (issues) | issue 0 1
Fair Value    
Less than 12 months $ 0 $ 6,203
12 months or longer 0 345
Total 0 6,548
Gross Unrealized Depreciation    
Less than 12 months 0 97
12 months or longer 0 8
Total $ 0 $ 105
Corporate bonds | Technology, media and telecommunications    
Number of Issues    
Less than 12 months (issues) | issue 0 6
12 months or longer (issues) | issue 0 5
Fair Value    
Less than 12 months $ 0 $ 12,638
12 months or longer 0 9,619
Total 0 22,257
Gross Unrealized Depreciation    
Less than 12 months 0 288
12 months or longer 0 390
Total $ 0 $ 678
Corporate bonds | Financial services    
Number of Issues    
Less than 12 months (issues) | issue 1 13
12 months or longer (issues) | issue 1 13
Fair Value    
Less than 12 months $ 4,744 $ 30,177
12 months or longer 998 32,855
Total 5,742 63,032
Gross Unrealized Depreciation    
Less than 12 months 256 650
12 months or longer 0 1,525
Total $ 256 $ 2,175
Mortgage-backed securities    
Number of Issues    
Less than 12 months (issues) | issue 0 22
12 months or longer (issues) | issue 20 22
Fair Value    
Less than 12 months $ 0 $ 1,539
12 months or longer 3,749 4,166
Total 3,749 5,705
Gross Unrealized Depreciation    
Less than 12 months 0 34
12 months or longer 60 198
Total $ 60 $ 232
Collateralized mortgage obligations | Government National Mortgage Association (GNMA) Insured Loans    
Number of Issues    
Less than 12 months (issues) | issue 0 2
12 months or longer (issues) | issue 7 22
Fair Value    
Less than 12 months $ 0 $ 3,797
12 months or longer 10,194 44,690
Total 10,194 48,487
Gross Unrealized Depreciation    
Less than 12 months 0 55
12 months or longer 80 1,679
Total $ 80 $ 1,734
Collateralized mortgage obligations | Federal Home Loan Mortgage Corporation (FHLMC) Insured Loans    
Number of Issues    
Less than 12 months (issues) | issue 0 3
12 months or longer (issues) | issue 7 18
Fair Value    
Less than 12 months $ 0 $ 4,541
12 months or longer 11,199 38,189
Total 11,199 42,730
Gross Unrealized Depreciation    
Less than 12 months 0 20
12 months or longer 87 1,284
Total $ 87 $ 1,304
Collateralized mortgage obligations | Federal National Mortgage Association (FNMA) Insured Loans    
Number of Issues    
Less than 12 months (issues) | issue 0 4
12 months or longer (issues) | issue 5 15
Fair Value    
Less than 12 months $ 0 $ 2,107
12 months or longer 3,843 38,986
Total 3,843 41,093
Gross Unrealized Depreciation    
Less than 12 months 0 3
12 months or longer 37 729
Total $ 37 $ 732
Asset-backed securities    
Number of Issues    
Less than 12 months (issues) | issue 0 1
12 months or longer (issues) | issue 1 0
Fair Value    
Less than 12 months $ 0 $ 2,829
12 months or longer 2,864 0
Total 2,864 2,829
Gross Unrealized Depreciation    
Less than 12 months 0 113
12 months or longer 84 0
Total $ 84 $ 113