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Components of Net Periodic Pension Cost (Schedule of Changes as a result of ASU 2017-07) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Other components of net periodic pension expense | $ 7 | $ 63 | $ 14 | $ 125
Salaries and employee benefits | $ 9,729 | 8,569 | $ 19,401 | 16,713
Accounting Standards Update 2017-07 [Member] | Previously Reported [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Other components of net periodic pension expense |  |  |  |
Salaries and employee benefits |  | $ 8,632 |  | $ 16,838

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