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Accumulated Other Comprehensive Income (Loss) (Amounts Reclassified Out Of Each Component Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net gain on investment securities |  |  |  | $ 206
Interest income |  | $ 29,628 |  | 26,995
Income before income taxes |  | 11,556 |  | 11,108
Income tax (expense) benefit |  | (2,268) |  | (3,165)
Net income |  | 9,288 |  | 7,943
Total reclassified for the period |  | (188) |  | (46)
Securities Available for Sale and Transferred Securities [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassification before tax | [1] | (82) |  | 203
Reclassification tax | [1] | 21 |  | (78)
Total reclassified for the period | [1] | (61) |  | 125
Prior Service Credit [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassification before tax | [2] | 18 | [1] | 13
Net Actuarial Losses [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassification before tax | [1],[2] | (187) |  | (292)
Pension And Post-Retirement Obligations [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassification before tax |  | (169) |  | (279)
Reclassification tax |  | 42 |  | 108
Total reclassified for the period |  | (127) |  | (171)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Securities Available for Sale and Transferred Securities [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net gain on investment securities |  |  |  | 206
Interest income |  | (82) |  | (3)
Income before income taxes |  | (82) |  | 203
Income tax (expense) benefit |  | 21 |  | (78)
Net income |  | $ (61) |  | $ 125
[1] | Includes amounts related to the amortization/accretion of unrealized net gains and losses related to the Company's reclassification of available for sale investment securities to the held to maturity category. The unrealized net gains/losses will be amortized/accreted over the remaining life of the investment securities as an adjustment of yield.
[2] | These items are included in the computation of net periodic pension expense. See Note 11 - Employee Benefit Plans for additional information.

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