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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Net gain on investment securities |  | $ 554 |  |  | $ 1,608 |  |  | $ 1,449 | $ 1,721
Interest income |  | 35,499 |  |  | 32,483 |  |  | 102,804 | 96,739
Income before income taxes |  | 15,213 |  |  | 17,114 |  |  | 30,235 | 46,002
Income tax benefit (expense) |  | (2,940) |  |  | (4,281) |  |  | (5,703) | (10,247)
Net income |  | 12,273 | $ 11,132 | $ 1,127 | 12,833 | $ 11,401 | $ 11,521 | 24,532 | 35,755
Total reclassified for the period |  | 114 |  |  | 854 |  |  | 202 | 233
Securities Available for Sale and Transferred Securities [Member] |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Reclassification before tax | [1] | 467 |  |  | 1,492 |  |  | 1,213 | 1,360
Reclassification tax | [1] | (120) |  |  | (376) |  |  | (311) | (343)
Total reclassified for the period | [1] | 347 |  |  | 1,116 |  |  | 902 | 1,017
Prior Service Credit [Member] |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Reclassification before tax | [2] | 8 |  |  | 16 |  |  | 26 | 49
Net Actuarial Losses [Member] |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Reclassification before tax | [2] | (321) |  |  | (366) |  |  | (967) | (1,098)
Pension And Post-Retirement Obligations [Member] |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Reclassification before tax |  | (313) |  |  | (350) |  |  | (941) | (1,049)
Reclassification tax |  | 80 |  |  | 88 |  |  | 241 | 265
Total reclassified for the period |  | (233) |  |  | (262) |  |  | (700) | (784)
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 |  | 554 |  |  | 1,608 |  |  | 1,449 | 1,721
Interest income |  | (87) |  |  | (116) |  |  | (236) | (361)
Income before income taxes |  | 467 |  |  | 1,492 |  |  | 1,213 | 1,360
Income tax benefit (expense) |  | (120) |  |  | (376) |  |  | (311) | (343)
Net income |  | $ 347 |  |  | $ 1,116 |  |  | $ 902 | $ 1,017
[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 12 – Employee Benefit Plans for additional information.

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