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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Statement of Comprehensive Income [Abstract] |  |
Net Income | $ 8,531 | $ 6,631
Other Comprehensive Income, Net of Tax: |  |
Net Unrealized Securities Holding Gains (Losses) Arising During the Period | (2,485) | 47
Amortization of Net Retirement Plan Actuarial Loss | 46 | 109
Accretion of Net Retirement Plan Prior Service Credit | (1) | (2)
Other Comprehensive Income (Loss) | (2,440) | 154
Comprehensive Income | $ 6,091 | $ 6,785

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