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Employee Benefit and Deferred Compensation Plans - Narrative (Details) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 USD ($) shares | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) point shares | Jun. 30, 2017 USD ($) 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 | 0
Treasury shares reissued (in shares) | shares |  |  | 93,511 |
Total stock-based compensation expense | $ | $ 1,920,000 | $ 1,237,000 | $ 3,712,000 | $ 2,411,000
Performance Based Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allowable variance |  |  | 5.00% |

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