Summary of Investments (Investments in Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 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	86	144
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 113,929	$ 118,189
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	1,349	3,351
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	71	71
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	32,852	70,432
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	2,283	4,063
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	146,781	188,621
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	3,632	7,414
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	69	91
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	111,866	111,993
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	1,177	2,380
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	32	46
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	28,033	67,201
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	1,549	3,188
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	139,899	179,194
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	2,726	5,568
U.S. Government Agency [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	9,971
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	29
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	9,971
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	29
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	18	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	13,965	3,555
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	63	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	13,965	4,174
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	63	8
Foreign Bonds [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	4	13
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	7,224	18,001
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	188	488
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	1	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	836	14,123
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	21	335
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	8,060	32,124
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	209	823
Public Utilities [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	5	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	7,366	9,579
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	59	160
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	1,068
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	153
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	7,366	10,647
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	59	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		2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		5,436
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		53
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		5,223
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		224
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		10,659
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		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	3	9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	9,076	25,664
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	174	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	11,973	33,799
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	277	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	4	5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,579	5,360
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	27	514
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	3	5
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,058	3,932
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	120	132
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	4,637	9,292
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	147	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	3	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	9,022	5,027
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	39	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	9,022	5,027
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	39	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	2	13
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	6,839	14,148
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	21	318
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	6,839	14,148
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	21	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	4	23
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,072	20,073
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	162	292
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	23	26
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	22,157	28,892
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	1,098	2,008
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	25,229	48,965
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	1,260	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	5	5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	668	684
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	1	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	668	684
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	1	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	17	7
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	42,084	4,466
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	414	141
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	4	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	85	5,209
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	207	43
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	42,169	9,675
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	621	184
Equity Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Less than Twelve Months, Number of Issues	17	53
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,063	6,196
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	172	971
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	39	25
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	4,819	3,231
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	734	875
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	6,882	9,427
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	906	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	0	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	210
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0	98
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	3	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	203	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	105	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	203	210
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	105	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	7	7
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	716	975
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	103	155
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	7	8
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	508	577
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	114	120
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,224	1,552
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	217	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	1	12
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	73	625
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	4	150
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	10	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	428	431
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	43	18
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	501	1,056
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	47	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	325	768
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	13	94
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	3	4
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	922	455
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	96	138
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,247	1,223
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	109	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	2	7
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	205	571
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	8	124
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Issues	7	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	552	144
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	116	22
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	757	715
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	124	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	744	1,876
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	44	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	1,060	746
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	175	224
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,804	2,622
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	219	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	2	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,146	878
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	85	353
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,146	2,049
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	$ 85	$ 384