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Investments (Details 3)
$ in Thousands
Sep. 30, 2017
USD ($)
Holdings
Dec. 31, 2016
USD ($)
Holdings
Fair value    
Less than 12 months $ 204,713 $ 269,475
12 months or longer 44,021 22,193
Total 248,734 291,668
Unrealized losses    
Less than 12 months 1,256 4,116
12 months or longer 1,024 1,047
Total $ 2,280 $ 5,163
No. of holdings | Holdings 324 253
Investment grade    
Fair value    
Less than 12 months $ 152,341 $ 239,041
12 months or longer 42,020 16,061
Total 194,361 255,102
Unrealized losses    
Less than 12 months 745 3,605
12 months or longer 533 399
Total $ 1,278 $ 4,004
No. of holdings | Holdings 113 136
Non-investment grade    
Fair value    
Less than 12 months $ 52,372 $ 24,484
12 months or longer 2,001 6,132
Total 54,373 30,616
Unrealized losses    
Less than 12 months 511 309
12 months or longer 491 648
Total $ 1,002 $ 957
No. of holdings | Holdings 211 116
Fixed maturities    
Fair value    
Less than 12 months $ 204,713 $ 263,525
12 months or longer 44,021 22,193
Total 248,734 285,718
Unrealized losses    
Less than 12 months 1,256 3,914
12 months or longer 1,024 1,047
Total $ 2,280 $ 4,961
No. of holdings | Holdings 324 252
U.S. treasury    
Fair value    
Less than 12 months $ 11,835 $ 5,031
12 months or longer 0 0
Total 11,835 5,031
Unrealized losses    
Less than 12 months 44 62
12 months or longer 0 0
Total $ 44 $ 62
No. of holdings | Holdings 4 1
States & political subdivisions    
Fair value    
Less than 12 months $ 49,278 $ 84,611
12 months or longer 7,280 0
Total 56,558 84,611
Unrealized losses    
Less than 12 months 449 2,293
12 months or longer 229 0
Total $ 678 $ 2,293
No. of holdings | Holdings 26 40
Corporate debt securities    
Fair value    
Less than 12 months $ 108,828 $ 112,453
12 months or longer 19,951 8,692
Total 128,779 121,145
Unrealized losses    
Less than 12 months 619 987
12 months or longer 213 399
Total $ 832 $ 1,386
No. of holdings | Holdings 255 155
Residential mortgage-backed securities    
Fair value    
Less than 12 months $ 5,553 $ 7,451
12 months or longer 5,771 4,974
Total 11,324 12,425
Unrealized losses    
Less than 12 months 19 60
12 months or longer 54 131
Total $ 73 $ 191
No. of holdings | Holdings 10 13
Commercial mortgage-backed securities    
Fair value    
Less than 12 months $ 12,793 $ 26,509
12 months or longer 11,019 4,319
Total 23,812 30,828
Unrealized losses    
Less than 12 months 106 437
12 months or longer 528 496
Total $ 634 $ 933
No. of holdings | Holdings 21 28
Collateralized debt obligations    
Fair value    
Less than 12 months $ 16,426 $ 27,470
12 months or longer 0 4,208
Total 16,426 31,678
Unrealized losses    
Less than 12 months 19 75
12 months or longer 0 21
Total $ 19 $ 96
No. of holdings | Holdings 8 15
Common stock    
Fair value    
Less than 12 months   $ 5,950
12 months or longer   0
Total   5,950
Unrealized losses    
Less than 12 months   202
12 months or longer   0
Total   $ 202
No. of holdings | Holdings   1