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Employee Benefit and Deferred Compensation Plans - Narrative (Details) | 3 Months Ended
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Mar. 31, 2018 USD ($) point shares | Mar. 31, 2017 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Minimum retirement age for benefits | 55 years |
Maximum retirement age for benefits | 65 years |
Eligible employee years of service | 15 years |
Number of points for eligibility | point | 70 |
Minimum eligible age for medicare coverage | 65 years |
Life insurance coverage face value | $ | $ 5,000 |
Age limit for life insurance coverage provided by the Company | 70 years |
Age at which retiree's pay for life insurance coverage at their sole expense | 70 years |
Option expiration period | 10 years |
Award vesting period | 3 years |
Stock options granted (in shares) | shares | 0 | 0
Treasury shares reissued (in shares) | shares | 71,747 |
Total stock-based compensation expense | $ | $ 1,792,000 | $ 1,174,000
Performance Based Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Allowable variance | 5.00% |

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