Investments Unrealized Losses Less Than and Greater Than 12 Months (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015 USD ($) security	Sep. 30, 2015 USD ($) security	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	$ 2,400	$ 2,400	$ 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	$ 6,347	$ 6,347		$ 2,475
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	161	161		103
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	$ 2,331	$ 2,331		$ 948
Debt Securities In Continuous Loss Less Than 12 Months Fair Value	172,894	172,894		95,705
Debt Securities, Continuous Unrealized Loss Position for Less Than 12 Months	$ 5,002	$ 5,002		$ 1,459
Debt Securities In Unrealized Loss Positions Qualitative Disclosure, Number Of Positions, Less Than 12 Months | security	174	174		96
Debt Securities In Continuous Loss Position 12 Months Or Longer, Fair Value	$ 29,707	$ 29,707		$ 54,454
Debt Securities, Continuous Unrealized Loss Position for Greater Than 12 Months	$ 3,676	$ 3,676		$ 1,964
Debt Securities In Unrealized Loss Positions Qualitative Disclosure, Number Of Positions,12 Months Or Greater | security	30	30		50
Debt Securities In Continuous Loss Position, Aggregate Fair Value	$ 202,601	$ 202,601		$ 150,159
Debt Securities, Gross Unrealized and Unrecognized Losses	$ 8,678	$ 8,678		$ 3,423
Debt Securities In Unrealized Loss Positions Qualitative Disclosure, Number Of Positions | security	204	204		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		$ 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	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	86,825	86,825		43,776
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 980	$ 980		$ 318
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security	85	85		47
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 17,392	$ 17,392		$ 33,716
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 1,957	$ 1,957		$ 1,130
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security	13	13		24
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 104,217	$ 104,217		$ 77,492
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	$ 2,937	$ 2,937		$ 1,448
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	98	98		71
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 37,472	$ 37,472		$ 21,233
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 615	$ 615		$ 74
Number of Held to Maturity Securities In Continuous Loss Position Less Than 12 Months | security	31	31		16
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 2,430	$ 2,430		$ 15,429
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 93	$ 93		$ 314
Number of Held to Maturity Securities In Continuous Loss Position 12 Months or Greater | security	5	5		21
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	$ 39,902	$ 39,902		$ 36,662
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	$ 708	$ 708		$ 388
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	36	36		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	$ 45,786	$ 45,786		$ 26,671
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 2,678	$ 2,678		$ 780
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security	53	53		24
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 5,085	$ 5,085		$ 2,530
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 730	$ 730		$ 244
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security	5	5		2
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 50,871	$ 50,871		$ 29,201
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	$ 3,408	$ 3,408		$ 1,024
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	58	58		26
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 2,744	$ 2,744		$ 3,866
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 728	$ 728		$ 285
Number of Held to Maturity Securities In Continuous Loss Position Less Than 12 Months | security	3	3		4
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 4,664	$ 4,664		$ 2,746
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 895	$ 895		$ 275
Number of Held to Maturity Securities In Continuous Loss Position 12 Months or Greater | security	4	4		2
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	$ 7,408	$ 7,408		$ 6,612
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	$ 1,623	$ 1,623		$ 560
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	7	7		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		$ 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	67	67		159
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1	$ 1		$ 2
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security	2	2		5
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 136	$ 136		$ 33
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 1	$ 1		$ 1
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security	3	3		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 203	$ 203		$ 192
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	$ 2	$ 2		$ 3
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	5	5		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	$ 132,678	$ 132,678		$ 70,606
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 3,659	$ 3,659		$ 1,100
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security	140	140		76
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 22,613	$ 22,613		$ 36,279
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 2,688	$ 2,688		$ 1,375
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security	21	21		27
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 155,291	$ 155,291		$ 106,885
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	6,347	6,347		2,475
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	40,216	40,216		25,099
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1,343	$ 1,343		$ 359
Number of Held to Maturity Securities In Continuous Loss Position Less Than 12 Months | security	34	34		20
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 7,094	$ 7,094		$ 18,175
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 988	$ 988		$ 589
Number of Held to Maturity Securities In Continuous Loss Position 12 Months or Greater | security	9	9		23
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	$ 47,310	$ 47,310		$ 43,274
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	$ 2,331	$ 2,331		$ 948
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	43	43		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	$ 8,736	$ 8,736		$ 5,224
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 67	$ 67		$ 66
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security	3	3		4
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 0	$ 0		$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0	$ 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		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 8,736	$ 8,736		$ 5,224
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	$ 67	$ 67		$ 66
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	3	3		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	$ 31,668	$ 31,668		$ 26,228
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 505	$ 505		$ 796
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security	2	2		4
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 110	$ 110		$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 29	$ 29		$ 0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security	1	1		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 31,778	$ 31,778		$ 26,228
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	$ 534	$ 534		$ 796
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	3	3		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	$ 41	$ 41		$ 46
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 6	$ 6		$ 1
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security	3	3		2
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 0	$ 0		$ 4
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 17	$ 17		$ 13
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security	1	1		9
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 41	$ 41		$ 50
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	$ 23	$ 23		$ 14
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	4	4		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	$ 0	$ 0		$ 234
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1	$ 1		$ 2
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security	1	1		4
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 0	$ 0		$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0	$ 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		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 0	$ 0		$ 234
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	$ 1	$ 1		$ 2
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	1	1		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	$ 40,445	$ 40,445		$ 31,732
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 579	$ 579		$ 865
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security	9	9		14
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 110	$ 110		$ 4
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 46	$ 46		$ 13
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security	2	2		9
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 40,555	$ 40,555		$ 31,736
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	$ 625	$ 625		$ 878
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	11	11		23