Investments Gross Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 860,473	$ 714,137
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	30,441	29,445
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	9,246	7,934
Available-for-sale Securities	899,827	759,086
Held-to-maturity Securities [Abstract]
Fixed maturities held-to-maturity, at amortized cost	247,004	259,953
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	7,832	7,396
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	2,291	2,383
Fixed maturities held-to-maturity, fair value	252,545	264,966
Total Fixed maturity securities, Amortized Cost	1,107,477
Total Fixed Maturity Securities, Fair Value	1,134,213
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]
Available-for-sale equity securities, amortized cost basis	17,765	23,727
Available for Sale Securities, Total	881,668	735,648
US Treasury Securities [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	9,929	9,995
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	2,261	2,597
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities	12,190	12,592
US Government Agencies Debt Securities [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	7,639	19,676
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	863	1,104
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities	8,502	20,780
Held-to-maturity Securities [Abstract]
Fixed maturities held-to-maturity, at amortized cost	2,003	2,010
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	28	110
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Fixed maturities held-to-maturity, fair value	2,031	2,120
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	563,279	470,319
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	15,017	15,815
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	5,022	3,085
Available-for-sale Securities	573,274	483,049
Held-to-maturity Securities [Abstract]
Fixed maturities held-to-maturity, at amortized cost	223,966	236,776
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	6,916	6,756
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	1,599	883
Fixed maturities held-to-maturity, fair value	229,283	242,649
Foreign Government Debt Securities [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	103	104
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	23	27
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities	126	131
Corporate Debt Securities [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	277,226	211,245
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	12,095	9,683
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	4,222	4,847
Available-for-sale Securities	285,099	216,081
Held-to-maturity Securities [Abstract]
Fixed maturities held-to-maturity, at amortized cost	21,035	21,167
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	888	530
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	692	1,500
Fixed maturities held-to-maturity, fair value	21,231	20,197
Commercial Mortgage Backed Securities [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	50	140
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	1	5
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities	51	145
Residential Mortgage Backed Securities [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	2,247	2,658
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	181	214
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	2	2
Available-for-sale Securities	2,426	2,870
Debt Securities [Member]
Held-to-maturity Securities [Abstract]
Total Fixed maturity securities, Amortized Cost	1,107,477	974,090
Debt Securities, Accumulative Gross Unrealized and Unrecognized Gains	38,273	36,841
Debt Securities, Accumulated Gross Unrealized and Unrecognized Losses	11,537	10,317
Total Fixed Maturity Securities, Fair Value	1,134,213	1,000,614
Equity Funds [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Securities	2,946	3,033
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]
Available-for-sale equity securities, amortized cost basis	2,867	3,270
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	79	0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	0	237
Fixed Income Funds [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Securities	14,197	18,504
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]
Available-for-sale equity securities, amortized cost basis	14,040	18,798
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	265	55
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	108	349
Common Stock [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Securities	25	43
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]
Available-for-sale equity securities, amortized cost basis	39	65
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	3	0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	17	22
Preferred Stock [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Securities	991	1,858
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]
Available-for-sale equity securities, amortized cost basis	819	1,594
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	174	266
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	2	2
Equity Securities [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Securities	18,159	23,438
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]
Available-for-sale equity securities, amortized cost basis	17,765	23,727
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	521	321
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	$ 127	$ 610