Investments Unrealized Losses Less Than and Greater Than 12 Months (Details) $ in Thousands	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Debt Securities In Continuous Loss Less Than 12 Months Fair Value	$ 286,213	$ 95,705
Debt Securities Continuous Loss Position Less Than 12 Months Unrealized Losses	$ 7,220	$ 1,459
Number of Debt Securities In Continuous Loss Less Than 12 Months	263	96
Debt Securities In Continuous Loss Position 12 Months Or Longer, Fair Value	$ 20,638	$ 54,454
Debt Securities In Continuous Loss Position 12 Months Or Longer, Unrealized Losses	$ 3,097	$ 1,964
Number of Debt Securities In Continuous Loss Position 12 Months or Longer	25	50
Debt Securities In Continuous Loss Position, Aggregate Fair Value	$ 306,851	$ 150,159
Debt Securities In Continuous Loss Position, Aggregate Unrealized Losses	$ 10,317	$ 3,423
Number of Debt Securities In Continuous Loss Position, Aggregate	288	146
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 149,495	$ 77,492
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	3,085	1,448
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	136,862	43,776
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1,474	$ 318
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	129	47
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 12,633	$ 33,716
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 1,611	$ 1,130
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	12	24
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	141	71
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 74,628	$ 21,233
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 774	$ 74
Number of Held to Maturity Securities In Continuous Loss Position Less Than 12 Months	59	16
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 2,404	$ 15,429
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 110	$ 314
Number of Held to Maturity Securities In Continuous Loss Position 12 Months or Greater	5	21
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	$ 77,032	$ 36,662
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 884	$ 388
Number of Held to Maturity Securities In Continuous Loss Position Aggregate	64	37
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 73,389	$ 29,201
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	4,846	1,024
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	70,081	26,671
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 4,330	$ 780
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	69	24
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 3,308	$ 2,530
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 516	$ 244
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	3	2
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	72	26
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 4,585	$ 3,866
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 641	$ 285
Number of Held to Maturity Securities In Continuous Loss Position Less Than 12 Months	4	4
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 2,160	$ 2,746
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 858	$ 275
Number of Held to Maturity Securities In Continuous Loss Position 12 Months or Greater	2	2
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	$ 6,745	$ 6,612
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 1,499	$ 560
Number of Held to Maturity Securities In Continuous Loss Position Aggregate	6	6
Residential Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 190	$ 192
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	3	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	57	159
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1	$ 2
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	2	5
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 133	$ 33
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 2	$ 1
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	3	1
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	5	6
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 223,074	$ 106,885
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	7,934	2,475
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	207,000	70,606
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 5,805	$ 1,100
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	200	76
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 16,074	$ 36,279
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 2,129	$ 1,375
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	18	27
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	218	103
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 79,213	$ 25,099
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1,415	$ 359
Number of Held to Maturity Securities In Continuous Loss Position Less Than 12 Months	63	20
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 4,564	$ 18,175
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 968	$ 589
Number of Held to Maturity Securities In Continuous Loss Position 12 Months or Greater	7	23
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	$ 83,777	$ 43,274
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 2,383	$ 948
Number of Held to Maturity Securities In Continuous Loss Position Aggregate	70	43
Equity Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 3,032	$ 5,224
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	237	66
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,030	5,224
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 237	$ 66
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	4	4
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 2	$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0	$ 0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	1	0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	5	4
Fixed Income Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 10,266	$ 26,228
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	349	796
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	10,158	26,228
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 318	$ 796
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	2	4
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 108	$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 31	$ 0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	1	0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	3	4
Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 102	$ 234
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	2	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	101	234
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1	$ 2
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	1	4
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 1	$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 1	$ 0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	1	0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	2	4
Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 43	$ 50
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	22	14
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	22	46
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1	$ 1
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	2	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 21	$ 4
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 21	$ 13
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	2	9
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	4	11
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 13,443	$ 31,736
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	610	878
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	13,311	31,732
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 557	$ 865
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	9	14
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 132	$ 4
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 53	$ 13
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	5	9
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	14	23