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Benefit Plans - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Nov. 17, 2009
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Company contributions |  | $ 0 | $ 0 |  |
Expected long-term rate of return on plan assets |  | 7.00% | 7.25% |  |
Accumulated benefit obligation for the pension plan |  | $ 97,200,000 | $ 86,100,000 |  |
Common share purchased under pension plan, shares |  |  |  |  | 115,800
Common share purchased under pension plan, value |  |  |  |  | $ 7,000,000
Common share purchased under pension plan, value per share |  |  |  |  | $ 60.45
Fair value, pension plan common shares held, shares |  | 115,800 | 115,800 |  |
Fair value of common shares held by pension plan |  | $ 13,900,000 | $ 10,500,000 |  |
Fair value of common shares held by pension plan, per share |  | $ 119.66 | $ 90.48 |  |
Estimated net actuarial (loss) expected to be recognized in the next fiscal year |  | $ (773,000) | $ (637,000) | $ 0 |
Expected long-term return on plan assets |  | 7.25% | 7.25% | 7.25% |
Cash balance in bank |  | $ 2,500,000 |  |  |
Market value of pension plan assets |  | 167,000,000 | $ 153,500,000 |  |
Equity investments |  | 3,500,000 | 0 |  |
Defined Contribution Plan, Cost Recognized |  | 1,300,000 | 1,200,000 | $ 1,100,000 |
Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Estimated prior service costs expected to be recognized in net periodic benefit cost during next fiscal year |  | 0 |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Benefit expense |  | 1,500,000 | 1,100,000 | $ 1,500,000 |
Accrued benefit cost |  | 8,800,000 | 8,000,000 |  |
Level 1 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Equity investments |  | 149,200,000 | 135,000,000 |  |
Level 2 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Equity investments |  | 17,800,000 | 18,500,000 |  |
Level 3 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Equity investments |  | $ 0 | $ 0 |  |
Scenario, Forecast [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Estimated net actuarial (loss) expected to be recognized in the next fiscal year | $ 576,000 |  |  |  |

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