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Investments Gross Unrealized Gains and Losses (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis $ 769,044,000   $ 714,137,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 40,401,000   29,445,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 5,716,000   7,934,000
Available-for-sale Securities, Debt Securities 803,729,000   735,648,000
Held-to-maturity Securities [Abstract]      
Held-to-maturity Securities 255,536,000   259,953,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 11,330,000   7,396,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss 1,680,000   2,383,000
Held-to-maturity Securities, Fair Value 265,186,000   264,966,000
Total Fixed maturity securities, Amortized Cost 1,024,580,000   974,090,000
Debt Securities, Accumulative Gross Unrealized and Unrecognized Gains 51,731,000   36,841,000
Debt Securities, Accumulated Gross Unrealized and Unrecognized Losses 7,396,000   10,317,000
Total Fixed Maturity Securities, Fair Value 1,068,915,000   1,000,614,000
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]      
Available-for-sale Equity Securities, Amortized Cost Basis 23,727,000   23,727,000
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 357,000   321,000
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax 536,000   610,000
Available-for-sale Securities, Equity Securities 23,548,000   23,438,000
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 1,900,000.0 $ 0  
US Treasury Securities [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis 9,979,000   9,995,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 2,975,000   2,597,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 0   0
Available-for-sale Securities, Debt Securities 12,954,000   12,592,000
US Government Agencies Debt Securities [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis 19,551,000   19,676,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 1,217,000   1,104,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 0   0
Available-for-sale Securities, Debt Securities 20,768,000   20,780,000
Held-to-maturity Securities [Abstract]      
Held-to-maturity Securities 2,008,000   2,010,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 101,000   110,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss 0   0
Held-to-maturity Securities, Fair Value 2,109,000   2,120,000
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 513,752,000   470,319,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 22,792,000   15,815,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 2,233,000   3,085,000
Available-for-sale Securities, Debt Securities 534,311,000   483,049,000
Held-to-maturity Securities [Abstract]      
Held-to-maturity Securities 232,394,000   236,776,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 10,092,000   6,756,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss 343,000   883,000
Held-to-maturity Securities, Fair Value 242,143,000   242,649,000
Foreign Government Debt Securities [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis 103,000   104,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 29,000   27,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 0   0
Available-for-sale Securities, Debt Securities 132,000   131,000
Corporate Debt Securities [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis 223,005,000   211,245,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 13,171,000   9,683,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 3,481,000   4,847,000
Available-for-sale Securities, Debt Securities 232,695,000   216,081,000
Held-to-maturity Securities [Abstract]      
Held-to-maturity Securities 21,134,000   21,167,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 1,137,000   530,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss 1,337,000   1,500,000
Held-to-maturity Securities, Fair Value 20,934,000   20,197,000
Commercial Mortgage Backed Securities [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis 118,000   140,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 5,000   5,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 0   0
Available-for-sale Securities, Debt Securities 123,000   145,000
Residential Mortgage Backed Securities [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis 2,536,000   2,658,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 212,000   214,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 2,000   2,000
Available-for-sale Securities, Debt Securities 2,746,000   2,870,000
Short-term Investments [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Amortized Cost Basis 0   251,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0   0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 0   0
Available-for-sale Securities, Debt Securities 0   251,000
Stock Mutual Funds [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 195,000   237,000
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]      
Available-for-sale Equity Securities, Amortized Cost Basis 3,270,000   3,270,000
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 0   0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax 195,000   237,000
Available-for-sale Securities, Equity Securities 3,075,000   3,033,000
Bond Mutual Funds [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 315,000   349,000
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]      
Available-for-sale Equity Securities, Amortized Cost Basis 18,798,000   18,798,000
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 92,000   55,000
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax 315,000   349,000
Available-for-sale Securities, Equity Securities 18,575,000   18,504,000
Common Stock [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 25,000   22,000
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]      
Available-for-sale Equity Securities, Amortized Cost Basis 65,000   65,000
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 3,000   0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax 25,000   22,000
Available-for-sale Securities, Equity Securities 43,000   43,000
Preferred Stock [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 1,000   2,000
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]      
Available-for-sale Equity Securities, Amortized Cost Basis 1,594,000   1,594,000
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 262,000   266,000
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax 1,000   2,000
Available-for-sale Securities, Equity Securities $ 1,855,000   $ 1,858,000