Investments Unrealized Losses Less Than and Greater Than 12 Months (Details) | 3 Months Ended | |
Mar. 31, 2016USD ($)security | Mar. 31, 2015USD ($) | Dec. 31, 2015USD ($)security |
Schedule of Available-for-sale Securities [Line Items] | | | |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net | $ 1,900,000 | $ 0 | |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | $ 5,716,000 | | $ 7,934,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 128 | | 218 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | $ 1,680,000 | | $ 2,383,000 |
Debt Securities In Continuous Loss Less Than 12 Months Fair Value | 113,223,000 | | 286,213,000 |
Debt Securities, Continuous Unrealized Loss Position for Less Than 12 Months | $ 2,959,000 | | $ 7,220,000 |
Debt Securities In Unrealized Loss Positions Qualitative Disclosure, Number Of Positions, Less Than 12 Months | security | 114 | | 263 |
Debt Securities In Continuous Loss Position 12 Months Or Longer, Fair Value | $ 34,870,000 | | $ 20,638,000 |
Debt Securities, Continuous Unrealized Loss Position for Greater Than 12 Months | $ 4,437,000 | | $ 3,097,000 |
Debt Securities In Unrealized Loss Positions Qualitative Disclosure, Number Of Positions,12 Months Or Greater | security | 44 | | 25 |
Debt Securities In Continuous Loss Position, Aggregate Fair Value | $ 148,093,000 | | $ 306,851,000 |
Debt Securities, Gross Unrealized and Unrecognized Losses | $ 7,396,000 | | $ 10,317,000 |
Debt Securities In Unrealized Loss Positions Qualitative Disclosure, Number Of Positions | security | 158 | | 288 |
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 | 52,802,000 | | 136,862,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 400,000 | | $ 1,474,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 47 | | 129 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 15,061,000 | | $ 12,633,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 1,833,000 | | $ 1,611,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 19 | | 12 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 67,863,000 | | $ 149,495,000 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | $ 2,233,000 | | $ 3,085,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 66 | | 141 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 9,813,000 | | $ 74,628,000 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 115,000 | | $ 774,000 |
Number of Held to Maturity Securities In Continuous Loss Position Less Than 12 Months | security | 15 | | 59 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 10,136,000 | | $ 2,404,000 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 228,000 | | $ 109,000 |
Number of Held to Maturity Securities In Continuous Loss Position 12 Months or Greater | security | 10 | | 5 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | $ 19,949,000 | | $ 77,032,000 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | $ 343,000 | | $ 883,000 |
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 25 | | 64 |
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 | $ 48,931,000 | | $ 70,081,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 2,309,000 | | $ 4,330,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 50 | | 69 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 4,861,000 | | $ 3,308,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 1,172,000 | | $ 517,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 8 | | 3 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 53,792,000 | | $ 73,389,000 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | $ 3,481,000 | | $ 4,847,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 58 | | 72 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 1,624,000 | | $ 4,585,000 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 134,000 | | $ 641,000 |
Number of Held to Maturity Securities In Continuous Loss Position Less Than 12 Months | security | 1 | | 4 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 4,682,000 | | $ 2,160,000 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 1,203,000 | | $ 859,000 |
Number of Held to Maturity Securities In Continuous Loss Position 12 Months or Greater | security | 4 | | 2 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | $ 6,306,000 | | $ 6,745,000 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | $ 1,337,000 | | $ 1,500,000 |
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 5 | | 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 | 53,000 | | 57,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 1,000 | | $ 1,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 1 | | 2 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 130,000 | | $ 133,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 1,000 | | $ 1,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 3 | | 3 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 183,000 | | $ 190,000 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | $ 2,000 | | $ 2,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 4 | | 5 |
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 | $ 101,786,000 | | $ 207,000,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 2,710,000 | | $ 5,805,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 98 | | 200 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 20,052,000 | | $ 16,074,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 3,006,000 | | $ 2,129,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 30 | | 18 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 121,838,000 | | $ 223,074,000 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 5,716,000 | | 7,934,000 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 11,437,000 | | 79,213,000 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 249,000 | | $ 1,415,000 |
Number of Held to Maturity Securities In Continuous Loss Position Less Than 12 Months | security | 16 | | 63 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 14,818,000 | | $ 4,564,000 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 1,431,000 | | $ 968,000 |
Number of Held to Maturity Securities In Continuous Loss Position 12 Months or Greater | security | 14 | | 7 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | $ 26,255,000 | | $ 83,777,000 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | $ 1,680,000 | | $ 2,383,000 |
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 30 | | 70 |
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 | $ 3,073,000 | | $ 3,030,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 195,000 | | $ 237,000 |
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 | $ 2,000 | | $ 2,000 |
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 | 1 | | 1 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 3,075,000 | | $ 3,032,000 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | $ 195,000 | | $ 237,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 5 | | 5 |
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 | $ 10,196,000 | | $ 10,158,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 280,000 | | $ 318,000 |
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 | $ 105,000 | | $ 108,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 35,000 | | $ 31,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 1 | | 1 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 10,301,000 | | $ 10,266,000 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | $ 315,000 | | $ 349,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 3 | | 3 |
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 | $ 0 | | $ 22,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 | | $ 1,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 0 | | 2 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 16,000 | | $ 21,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 25,000 | | $ 21,000 |
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 | $ 16,000 | | $ 43,000 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | $ 25,000 | | $ 22,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 2 | | 4 |
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 | | $ 101,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 | | $ 1,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 0 | | 1 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 0 | | $ 1,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 1,000 | | $ 1,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 1 | | 1 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 0 | | $ 102,000 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | $ 1,000 | | $ 2,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 1 | | 2 |
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 | $ 13,269,000 | | $ 13,311,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 475,000 | | $ 557,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 6 | | 9 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 123,000 | | $ 132,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 61,000 | | $ 53,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 5 | | 5 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 13,392,000 | | $ 13,443,000 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | $ 536,000 | | $ 610,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 11 | | 14 |