Aging of Unrealized Losses by Class (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 security		Mar. 31, 2014	Dec. 31, 2014 security
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	175	[1]		142	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	$ 1,041		$ 921
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	82,714			88,143
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	39	[1]		49	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	307		772
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	33,703			52,517
U.S. government and agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	19	[1]		32	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	56		285
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	16,322			36,081
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	17	[1]		20	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	149		305
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	11,378			16,947
States, municipalities and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	38	[1]		24	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	393		100
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	41,731			22,272
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	9	[1]		11	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	44		117
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	11,108			14,310
Public Utility, Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	1	[1]		1	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	1		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,274			1,274
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	1	[1]		1	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	7		38
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,042			1,014
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	23	[1]		23	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	66		271
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	15,801			23,738
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	8	[1]		16	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	104		309
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	10,047			20,215
Redeemable Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	6	[1]		4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	70		10
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	667			408
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	0	[1]		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0			0
Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	87	[1]		84	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	586		667
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	75,795			83,773
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	35	[1]		48	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	304		769
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	33,575			52,486
Public Utility, Equities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	3	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	221
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	0	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	70	[1]		54	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	427		247
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	5,617			3,992
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	4	[1]		1	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	3		3
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	128			31
Nonredeemable Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	15	[1]		4	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	22		7
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,081			378
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	0	[1]		0	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0			0
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less Than Twelve Months, Qualitative Disclosure, Number of Positions	88	[1]		58	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	455		254
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	6,919			4,370
Available-for-sale, Securities in Unrealized Loss Positions, Twelve Months or More, Qualitative Disclosure, Number of Positions	4	[1]		1	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	3		3
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 128			$ 31

[1] This amount represents the actual number of discrete securities, not the number of shares of those securities. The numbers are not presented in thousands.