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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, 2021 | Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net gain on investment securities |  | $ 74 | $ 221
Interest income |  | 37,857 | 33,124
Income before income taxes |  | 26,057 | 1,449
Income tax (expense) benefit |  | (5,347) | (322)
Net income |  | 20,710 | 1,127
Total reclassified for the period |  | (137) | (104)
Securities Available for Sale and Transferred Securities [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification before tax | [1] | 1 | 175
Reclassification tax | [1] |  | (45)
Total reclassified for the period | [1] | 1 | 130
Prior Service Credit [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification before tax | [2] | 1 | 9
Net Actuarial Losses [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification before tax | [2] | (186) | (323)
Pension And Post-Retirement Obligations [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification before tax |  | (185) | (314)
Reclassification tax |  | 47 | 80
Total reclassified for the period |  | (138) | (234)
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 |  | 74 | 221
Interest income |  | (73) | (46)
Income before income taxes |  | 1 | 175
Income tax (expense) benefit |  |  | (45)
Net income |  | $ 1 | $ 130
[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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