Investments Unrealized Losses Less Than and Greater Than 12 Months (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) security	Dec. 31, 2014 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	$ 0	$ 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax			$ 5,665	$ 2,475
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security			140	103
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss			$ 1,721	$ 948
Debt Securities In Continuous Loss Less Than 12 Months Fair Value			241,094	95,705
Debt Securities, Continuous Unrealized Loss Position for Less Than 12 Months			$ 4,817	$ 1,459
Debt Securities In Unrealized Loss Positions Qualitative Disclosure, Number Of Positions, Less Than 12 Months | security			164	96
Debt Securities In Continuous Loss Position 12 Months Or Longer, Fair Value			$ 36,107	$ 54,454
Debt Securities, Continuous Unrealized Loss Position for Greater Than 12 Months			$ 2,569	$ 1,964
Debt Securities In Unrealized Loss Positions Qualitative Disclosure, Number Of Positions,12 Months Or Greater | security			24	50
Debt Securities In Continuous Loss Position, Aggregate Fair Value			$ 277,201	$ 150,159
Debt Securities, Gross Unrealized and Unrecognized Losses			$ 7,386	$ 3,423
Debt Securities In Unrealized Loss Positions Qualitative Disclosure, Number Of Positions | security			188	146
US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax			$ 0	$ 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss			0	0
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value			139,803	43,776
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss			$ 1,956	$ 318
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security			98	47
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value			$ 19,524	$ 33,716
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss			$ 1,898	$ 1,130
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security			10	24
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value			$ 159,327	$ 77,492
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax			$ 3,854	$ 1,448
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security			108	71
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value			$ 53,064	$ 21,233
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss			$ 963	$ 74
Number of Held to Maturity Securities In Continuous Loss Position Less Than 12 Months | security			37	16
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value			$ 7,582	$ 15,429
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss			$ 133	$ 314
Number of Held to Maturity Securities In Continuous Loss Position 12 Months or Greater | security			7	21
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value			$ 60,646	$ 36,662
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss			$ 1,096	$ 388
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security			44	37
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value			$ 45,000	$ 26,671
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss			$ 1,644	$ 780
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security			26	24
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value			$ 3,670	$ 2,530
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss			$ 165	$ 244
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security			2	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value			$ 48,670	$ 29,201
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax			$ 1,809	$ 1,024
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security			28	26
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value			$ 3,225	$ 3,866
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss			$ 254	$ 285
Number of Held to Maturity Securities In Continuous Loss Position Less Than 12 Months | security			2	4
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value			$ 5,190	$ 2,746
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss			$ 371	$ 275
Number of Held to Maturity Securities In Continuous Loss Position 12 Months or Greater | security			2	2
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value			$ 8,415	$ 6,612
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss			$ 625	$ 560
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security			4	6
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax			$ 0	$ 0
Residential Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value			2	159
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss			$ 0	$ 2
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security			1	5
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value			$ 141	$ 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 | security			3	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value			$ 143	$ 192
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax			$ 2	$ 3
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security			4	6
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value			$ 184,805	$ 70,606
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss			$ 3,600	$ 1,100
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security			125	76
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value			$ 23,335	$ 36,279
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss			$ 2,065	$ 1,375
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security			15	27
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value			$ 208,140	$ 106,885
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax			5,665	2,475
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value			56,289	25,099
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss			$ 1,217	$ 359
Number of Held to Maturity Securities In Continuous Loss Position Less Than 12 Months | security			39	20
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value			$ 12,772	$ 18,175
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss			$ 504	$ 589
Number of Held to Maturity Securities In Continuous Loss Position 12 Months or Greater | security			9	23
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value			$ 69,061	$ 43,274
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss			$ 1,721	$ 948
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security			48	43
Stock Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value			$ 5,409	$ 5,224
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss			$ 133	$ 66
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security			4	4
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, Accumulated Loss			$ 0	$ 0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security			0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value			$ 5,409	$ 5,224
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax			$ 133	$ 66
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security			4	4
Bond Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value			$ 50,070	$ 26,228
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss			$ 1,243	$ 796
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security			6	4
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, Accumulated Loss			$ 0	$ 0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security			0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value			$ 50,070	$ 26,228
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax			$ 1,243	$ 796
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security			6	4
Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value			$ 46	$ 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 | security			2	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value			$ 2	$ 4
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss			$ 15	$ 13
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security			9	9
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value			$ 48	$ 50
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax			$ 16	$ 14
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security			11	11
Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value			$ 75	$ 234
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss			$ 2	$ 2
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security			2	4
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, Accumulated Loss			$ 0	$ 0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security			0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value			$ 75	$ 234
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax			$ 2	$ 2
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security			2	4
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value			$ 55,600	$ 31,732
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss			$ 1,379	$ 865
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security			14	14
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value			$ 2	$ 4
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss			$ 15	$ 13
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security			9	9
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value			$ 55,602	$ 31,736
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax			$ 1,394	$ 878
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security			23	23