Fair Value Disclosure (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt securities [Abstract]
Debt securities	$ 288,193	$ 284,099
Equity securities [Abstract]
Equity securities	40,726	39,247
Recurring [Member]
Debt securities [Abstract]
United States government obligations and authorities	59,549	62,323
Obligations of states and political subdivisions	92,172	91,614
Corporate	125,021	119,024
International	11,451	11,138
Debt securities	288,193	284,099
Equity securities [Abstract]
Common stocks	40,726	39,247
Equity securities	40,726	39,247
Total debt and equity securities	328,919	323,346
Level 1 [Member] | Recurring [Member]
Debt securities [Abstract]
United States government obligations and authorities	39,419	46,002
Obligations of states and political subdivisions	0	0
Corporate	0	0
International	0	0
Debt securities	39,419	46,002
Equity securities [Abstract]
Common stocks	40,726	39,247
Equity securities	40,726	39,247
Total debt and equity securities	80,145	85,249
Level 2 [Member] | Recurring [Member]
Debt securities [Abstract]
United States government obligations and authorities	20,130	16,321
Obligations of states and political subdivisions	92,172	91,614
Corporate	125,021	119,024
International	11,451	11,138
Debt securities	248,774	238,097
Equity securities [Abstract]
Common stocks	0	0
Equity securities	0	0
Total debt and equity securities	248,774	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