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Business Combinations (Pro Forma Consolidated Results) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
ProAssurance Pro Forma Consolidated Results, Revenue |  |  |  |  |  |  |  |  |  | $ 852,326 | $ 926,873
ProAssurance Actual Consolidated Results, Revenue |  |  |  |  |  |  |  |  | $ 772,079 | 852,326 | 740,178
ProAssurance Pro Forma Consolidated Results, Net income |  |  |  |  |  |  |  |  |  | 197,527 | 297,149
ProAssurance Actual Consolidated Results, Net income | $ 34,948 | $ 10,276 | $ 33,158 | $ 37,814 | $ 65,114 | $ 34,778 | $ 49,942 | $ 46,731 | $ 116,197 | 196,565 | 297,523
Eastern Insurance Holdings [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjustments related to pro forma revenue |  |  |  |  |  |  |  |  |  | $ 1,000 | $ 400

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