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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, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Net gain on investment securities |  | $ (0) |  |  | $ 554 |  |  | $ 71 | $ 1,449
Interest income |  | 38,273 |  |  | 35,499 |  |  | 113,862 | 102,804
Income before income taxes |  | 21,728 |  |  | 15,213 |  |  | 73,385 | 30,235
Income tax expense |  | (4,553) |  |  | (2,940) |  |  | (15,300) | (5,703)
Net income |  | 17,175 | $ 20,200 | $ 20,710 | 12,273 | $ 11,132 | $ 1,127 | 58,085 | 24,532
Total reclassified for the period |  | (169) |  |  | 114 |  |  | (491) | 202
Securities Available for Sale and Transferred Securities [Member] |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Reclassification before tax | [1] | (42) |  |  | 467 |  |  | (105) | 1,213
Reclassification tax | [1] | 11 |  |  | (120) |  |  | 27 | (311)
Total reclassified for the period | [1] | (31) |  |  | 347 |  |  | (78) | 902
Prior Service Credit [Member] |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Reclassification before tax | [2] |  |  |  | 8 |  |  | 2 | 26
Net Actuarial Losses [Member] |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Reclassification before tax | [2] | (186) |  |  | (321) |  |  | (557) | (967)
Pension And Post-Retirement Obligations [Member] |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Reclassification before tax |  | (185) |  |  | (313) |  |  | (555) | (941)
Reclassification tax |  | 47 |  |  | 80 |  |  | 142 | 241
Total reclassified for the period |  | (138) |  |  | (233) |  |  | (413) | (700)
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 |  | (0) |  |  | 554 |  |  | 71 | 1,449
Interest income |  | (42) |  |  | (87) |  |  | (176) | (236)
Income before income taxes |  | (42) |  |  | 467 |  |  | (105) | 1,213
Income tax expense |  | 11 |  |  | (120) |  |  | 27 | (311)
Net income |  | $ (31) |  |  | $ 347 |  |  | $ (78) | $ 902
[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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