Investments Unrealized Losses Less Than and Greater Than 12 Months (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | | |
Mar. 31, 2014USD ($) | Jun. 30, 2014USD ($) | Jun. 30, 2015USD ($)security | Dec. 31, 2014USD ($)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 |