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Investments Unrealized Losses Less Than and Greater Than 12 Months (Details) | 3 Months Ended |
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Mar. 31, 2016 USD ($) security | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |  |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net | $ 1,900,000.0 | $ 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

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for less than one year or normal operating cycle, if longer, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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