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Employee Benefits And Deferred Compensation Plans (Estimated Future Benefit Payments, SERP) (Details) - Supplemental Executive Retirement Plan [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 193
2019 193
2020 193
2021 277
2022 2,841
Year 2023 - 2027 $ 1,185