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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, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) gain on investment securities |  | $ 0 |  |  |  | $ 0 |  |  |  | $ 15 |  | $ (71) |
Interest income |  | 43,068 |  |  |  | 38,273 |  |  |  | 124,223 |  | 113,862 |
Income before income taxes |  | 18,579 |  |  |  | 21,728 |  |  |  | 56,512 |  | 73,385 |
Income tax expense |  | (4,725) |  |  |  | (4,553) |  |  |  | (12,027) |  | (15,300) |
Net income |  | 13,854 |  | $ 15,648 | $ 14,983 | 17,175 |  | $ 20,200 | $ 20,710 | 44,485 |  | 58,085 |
Securities Available for Sale and Transferred Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification, Pre-tax Amount |  | (23) | [1] |  |  | (42) | [2] |  |  | (95) | [1] | (105) | [2]
Reclassification tax |  | 7 | [1] |  |  | 11 | [2] |  |  | 25 | [1] | 27 | [2]
Reclassification, Net of tax amount |  | (16) | [1] |  |  | (31) | [2] |  |  | (70) | [1] | (78) | [2]
Prior Service Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification, Pre-tax Amount | [3] | 0 |  |  |  | 1 |  |  |  | 0 |  | 2 |
Net Actuarial Losses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification, Pre-tax Amount | [3] | (64) |  |  |  | (186) |  |  |  | (192) |  | (557) |
Pension And Post-Retirement Obligations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification, Pre-tax Amount |  | (64) |  |  |  | (185) |  |  |  | (192) |  | (555) |
Reclassification tax |  | 16 |  |  |  | 47 |  |  |  | 49 |  | 142 |
Reclassification, Net of tax amount |  | (48) |  |  |  | (138) |  |  |  | (143) |  | (413) |
Accumulated Other Comprehensive income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification, Net of tax amount |  | (64) |  |  |  | (169) |  |  |  | (213) |  | (491) |
Reclassification out of Accumulated Other Comprehensive (Loss) 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 |  | 0 |  |  |  | 0 |  |  |  | (15) |  | 71 |
Interest income |  | (23) |  |  |  | (42) |  |  |  | (80) |  | (176) |
Income before income taxes |  | (23) |  |  |  | (42) |  |  |  | (95) |  | (105) |
Income tax expense |  | 7 |  |  |  | 11 |  |  |  | 25 |  | 27 |
Net income |  | $ (16) |  |  |  | $ (31) |  |  |  | $ 70 |  | $ 78 |
[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] | 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.
[3] | 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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