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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, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Net (loss) gain on investment securities |  | $ (3) |  | $ 674 |  | $ 71 | $ 895
Interest income |  | 37,732 |  | 34,181 |  | 75,589 | 67,305
Income before income taxes |  | 25,600 |  | 13,573 |  | 51,657 | 15,022
Income tax (expense) benefit |  | (5,400) |  | (2,441) |  | (10,747) | (2,763)
Net income |  | 20,200 | $ 20,710 | 11,132 | $ 1,127 | 40,910 | 12,259
Total reclassified for the period |  | (185) |  | 192 |  | (322) | 88
Securities Available for Sale and Transferred Securities [Member] |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Reclassification before tax | [1] | (64) |  | 571 |  | (63) | 746
Reclassification tax | [1] | 16 |  | (146) |  | 16 | (191)
Total reclassified for the period | [1] | (48) |  | 425 |  | (47) | 555
Prior Service Credit [Member] |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Reclassification before tax | [2] |  |  | 9 |  | 1 | 18
Net Actuarial Losses [Member] |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Reclassification before tax | [2] | (185) |  | (323) |  | (371) | (646)
Pension And Post-Retirement Obligations [Member] |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Reclassification before tax |  | (185) |  | (314) |  | (370) | (628)
Reclassification tax |  | 48 |  | 81 |  | 95 | 161
Total reclassified for the period |  | (137) |  | (233) |  | (275) | (467)
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 (loss) gain on investment securities |  | (3) |  | 674 |  | 71 | 895
Interest income |  | (61) |  | (103) |  | (134) | (149)
Income before income taxes |  | (64) |  | 571 |  | (63) | 746
Income tax (expense) benefit |  | 16 |  | (146) |  | 16 | (191)
Net income |  | $ (48) |  | $ 425 |  | $ (47) | $ 555
[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 14 – Employee Benefit Plans for additional information.

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