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Employee Benefit and Deferred Compensation Plans - Narrative (Details) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 USD ($) shares | Sep. 30, 2016 USD ($) shares | Sep. 30, 2017 USD ($) point shares | Sep. 30, 2016 USD ($) 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 | 0 | 0
Treasury shares reissued (in shares) | shares |  |  | 99,318 |
Total stock-based compensation expense | $ | $ 1,359,000 | $ 848,000 | $ 3,770,000 | $ 2,563,000

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