Investments Gross Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 706,667	$ 667,966
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	35,527	41,736
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	6,347	2,475
Available-for-sale Securities, Debt Securities	735,847	707,227
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities	247,829	224,932
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	8,550	8,907
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	2,331	948
Held-to-maturity Securities, Fair Value	254,048	232,891
Total Fixed maturity securities, Amortized Cost	954,496	892,898
Debt Securities, Accumulative Gross Unrealized and Unrecognized Gains	44,077	50,643
Debt Securities, Accumulated Gross Unrealized and Unrecognized Losses	8,678	3,423
Total Fixed Maturity Securities, Fair Value	989,895	940,118
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]
Available-for-sale Equity Securities, Amortized Cost Basis	66,855	68,787
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	438	1,970
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	625	878
Available-for-sale Securities, Equity Securities	66,668	69,879
US Treasury Securities [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	10,010	10,056
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	2,892	2,924
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities, Debt Securities	12,902	12,980
US Government Agencies Debt Securities [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	36,364	38,312
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	1,359	1,937
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities, Debt Securities	37,723	40,249
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities	2,012	2,017
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	137	178
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Held-to-maturity Securities, Fair Value	2,149	2,195
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	455,494	404,657
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	18,018	19,146
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	2,937	1,448
Available-for-sale Securities, Debt Securities	470,575	422,355
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities	223,084	192,875
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	7,741	7,782
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	708	388
Held-to-maturity Securities, Fair Value	230,117	200,269
Foreign Government Debt Securities [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	104	104
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	30	31
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities, Debt Securities	134	135
Corporate Debt Securities [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	201,760	211,410
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	12,994	17,441
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	3,408	1,024
Available-for-sale Securities, Debt Securities	211,346	227,827
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities	22,733	30,040
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	672	947
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	1,623	560
Held-to-maturity Securities, Fair Value	21,782	30,427
Commercial Mortgage Backed Securities [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	162	223
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	7	8
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities, Debt Securities	169	231
Residential Mortgage Backed Securities [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	2,773	3,204
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	227	249
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	2	3
Available-for-sale Securities, Debt Securities	2,998	3,450
Short-term Investments [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	254
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0
Available-for-sale Securities, Debt Securities	254
Stock Mutual Funds [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	67	66
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]
Available-for-sale Equity Securities, Amortized Cost Basis	16,007	16,005
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	189	1,657
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	67	66
Available-for-sale Securities, Equity Securities	16,129	17,596
Bond Mutual Funds [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	534	796
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]
Available-for-sale Equity Securities, Amortized Cost Basis	49,189	50,976
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	6	60
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	534	796
Available-for-sale Securities, Equity Securities	48,661	50,240
Common Stock [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	23	14
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]
Available-for-sale Equity Securities, Amortized Cost Basis	65	65
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	23	14
Available-for-sale Securities, Equity Securities	42	51
Preferred Stock [Member]
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	1	2
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]
Available-for-sale Equity Securities, Amortized Cost Basis	1,594	1,741
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	243	253
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	1	2
Available-for-sale Securities, Equity Securities	$ 1,836	$ 1,992