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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Net gain on investment securities |  | $ 7 | $ 210 | $ 7 | $ 416
Interest income |  | 30,085 | 27,422 | 59,713 | 54,417
Income before income taxes |  | 15,149 | 8,982 | 26,705 | 20,090
Income tax (expense) benefit |  | (2,979) | (2,736) | (5,247) | (5,901)
Net income |  | 12,170 | 6,246 | 21,458 | 14,189
Total reclassified for the period |  | (194) | (59) | (382) | (105)
Securities Available for Sale and Transferred Securities [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification before tax | [1] | (90) | 184 | (172) | 387
Reclassification tax | [1] | 23 | (72) | 44 | (150)
Total reclassified for the period | [1] | (67) | 112 | (128) | 237
Prior Service Credit [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification before tax | [2] | 18 | 13 | 36 | 26
Net Actuarial Losses [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification before tax | [2] | (188) | (291) | (375) | (583)
Pension And Post-Retirement Obligations [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification before tax |  | (170) | (278) | (339) | (557)
Reclassification tax |  | 43 | 107 | 85 | 215
Total reclassified for the period |  | (127) | (171) | (254) | (342)
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 |  | 7 | 210 | 7 | 416
Interest income |  | (97) | (26) | (179) | (29)
Income before income taxes |  | (90) | 184 | (172) | 387
Income tax (expense) benefit |  | 23 | (72) | 44 | (150)
Net income |  | $ (67) | $ 112 | $ (128) | $ 237
[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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