Fair Value Disclosure (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Debt securities [Abstract]
Debt securities	$ 341,915	$ 284,099
Equity securities [Abstract]
Equity securities	38,086	39,247
Recurring [Member]
Debt securities [Abstract]
United States government obligations and authorities	65,994	62,323
Obligations of states and political subdivisions	108,597	91,614
Corporate	155,324	119,024
International	12,000	11,138
Debt securities	341,915	284,099
Equity securities [Abstract]
Common stocks	38,086	39,247
Equity securities	38,086	39,247
Total debt and equity securities	380,001	323,346
Level 1 [Member] | Recurring [Member]
Debt securities [Abstract]
United States government obligations and authorities	40,833	46,002
Obligations of states and political subdivisions	0	0
Corporate	0	0
International	0	0
Debt securities	40,833	46,002
Equity securities [Abstract]
Common stocks	38,086	39,247
Equity securities	38,086	39,247
Total debt and equity securities	78,919	85,249
Level 2 [Member] | Recurring [Member]
Debt securities [Abstract]
United States government obligations and authorities	25,161	16,321
Obligations of states and political subdivisions	108,597	91,614
Corporate	155,324	119,024
International	12,000	11,138
Debt securities	301,082	238,097
Equity securities [Abstract]
Common stocks	0	0
Equity securities	0	0
Total debt and equity securities	301,082	238,097
Level 3 [Member] | Recurring [Member]
Debt securities [Abstract]
United States government obligations and authorities	0	0
Obligations of states and political subdivisions	0	0
Corporate	0	0
International	0	0
Debt securities	0	0
Equity securities [Abstract]
Common stocks	0	0
Equity securities	0	0
Total debt and equity securities	$ 0	$ 0