Summary of Investments (Investments in Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012 issues	Dec. 31, 2011 issues
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	140	144
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 156,085	$ 118,189
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	2,556	3,351
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	66	71
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	38,193	70,432
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	2,834	4,063
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	194,278	188,621
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	5,390	7,414
Total, Continuous Unrealized Loss Positions, Less than Twelve Months, Number of Issues		144
Total, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		118,189
Total, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		3,351
Total, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues		72
Total, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		70,905
Total, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		4,124
Total, Continuous Unrealized Loss Position, Fair Value		189,094
Total, Continuous Unrealized Loss Position, Aggregate Losses		7,475
Debt Securities [Member]
Schedule of Investments [Line Items]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Number of Issues		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues		1
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		473
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		61
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value		473
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses		61
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	105	91
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	153,344	111,993
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	2,086	2,380
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	35	46
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	33,874	67,201
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	1,954	3,188
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	187,218	179,194
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	4,040	5,568
States, Municipalities and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Number of Issues		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues		1
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		473
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		61
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value		473
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses		61
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	36	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	21,466	3,555
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	269	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	0	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	619
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	21,466	4,174
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	269	8
Foreign Bonds [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	14	13
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	23,083	18,001
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	488	488
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	2	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,982	14,123
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	139	335
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	27,065	32,124
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	627	823
Public Utilities [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	1	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	989	9,579
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	11	160
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	1	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,117	1,068
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	44	153
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,106	10,647
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	55	313
Corporate Bonds [Member] | Energy [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	1	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,526	5,436
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	1	53
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	0	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	5,223
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	224
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,526	10,659
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	1	277
Corporate Bonds [Member] | Industrial [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	9	9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	27,584	25,664
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	381	359
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	1	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,897	8,135
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	103	291
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	30,481	33,799
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	484	650
Corporate Bonds [Member] | Consumer Goods and Service [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	12	5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	17,088	5,360
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	252	514
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	1	5
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,379	3,932
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	19	132
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	18,467	9,292
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	271	646
Corporate Bonds [Member] | Health Care [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	1	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,715	5,027
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	7	45
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	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, Fair Value	1,715	5,027
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	7	45
Corporate Bonds [Member] | Technology, Media and Telecommunications [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	3	13
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	10,589	14,148
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	47	318
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	1	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,135	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	59	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	12,724	14,148
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	106	318
Corporate Bonds [Member] | Financial Services [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	16	23
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	24,317	20,073
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	340	292
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	22	26
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	22,061	28,892
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	1,406	2,008
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	46,378	48,965
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	1,746	2,300
Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	6	5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	5,034	684
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	22	4
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	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, Fair Value	5,034	684
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	22	4
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	5	7
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	18,857	4,466
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	117	141
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	7	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	303	5,209
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	184	43
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	19,160	9,675
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	301	184
Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	96
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	151
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	96
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	151
Equity Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	35	53
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,741	6,196
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	470	971
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	31	25
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	4,319	3,231
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	880	875
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	7,060	9,427
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	1,350	1,846
Common Stocks [Member] | Public Utilities [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	4	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	462	210
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	172	98
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	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, Fair Value	462	210
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	172	98
Common Stocks [Member] | Industrial [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	9	7
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	876	975
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	123	155
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	6	8
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	504	577
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	117	120
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,380	1,552
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	240	275
Common Stocks [Member] | Consumer Goods and Service [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	5	12
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	94	625
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	16	150
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	6	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	345	431
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	118	18
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	439	1,056
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	134	168
Common Stocks [Member] | Health Care [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	3	5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	446	768
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	18	94
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	5	4
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	789	455
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	169	138
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,235	1,223
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	187	232
Common Stocks [Member] | Technology, Media and Telecommunications [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	10	7
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	200	571
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	16	124
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	4	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	528	144
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	118	22
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	728	715
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	134	146
Common Stocks [Member] | Financial Services [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	4	16
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	663	1,876
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	125	319
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	7	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,018	746
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	217	224
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,681	2,622
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	342	543
Nonredeemable Preferred Stocks [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	0	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	1,171
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0	31
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	3	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,135	878
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	141	353
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,135	2,049
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	$ 141	$ 384