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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2023
Accumulated Other Comprehensive Loss |
Schedule of components of accumulated other comprehensive (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | ​ | December 31, 2023 |  | ​ | December 31, 2022 |
Net unrealized loss on investment securities available for sale | ​ | $ | (51,527) | ​ | $ | (66,250) | ​
Income tax benefit | ​ |  | (11,270) | ​ |  | (14,266) | ​
Net of income taxes | ​ |  | (40,257) | ​ |  | (51,984) | ​
Benefit plan adjustments | ​ |  | (4,370) | ​ |  | (5,499) | ​
Income tax benefit | ​ |  | (956) | ​ |  | (1,184) | ​
Net of income taxes | ​ |  | (3,414) | ​ |  | (4,315) | ​
Derivative adjustments | ​ |  | (871) | ​ |  | (47) | ​
Income tax benefit | ​ |  | (191) | ​ |  | (10) | ​
Net of income taxes | ​ |  | (680) | ​ |  | (37) | ​
Accumulated other comprehensive loss | ​ | $ | (44,351) | ​ | $ | (56,336) | ​
Schedule of other comprehensive income (loss) and related tax effects | Other comprehensive income (loss) and related tax effects for the years ended December 31, 2023, 2022 and 2021 are as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2023 |  | 2022 | ​ | 2021 | ​
Unrealized gain (loss) on investment securities available for sale | ​ | $ | 14,804 | ​ | $ | (66,435) | ​ | $ | (11,487) | ​
Net (gain) loss on the sale of investment securities available for sale (1) | ​ | ​ | (81) | ​ | ​ | 1,976 | ​ | ​ | ​ | ​
Other comprehensive income (loss) on available for sale debt securities | ​ | ​ | 14,723 | ​ | ​ | (64,459) | ​ | ​ | (11,487) | ​
Benefit plans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of actuarial loss (2) | ​ | ​ | 194 | ​ | ​ | 198 | ​ | ​ | 301 | ​
Actuarial gain | ​ | ​ | 935 | ​ | ​ | 172 | ​ | ​ | 1,808 | ​
Net change in benefit plan liabilities | ​ |  | 1,129 | ​ |  | 370 | ​ |  | 2,109 | ​
Net change in derivatives | ​ | ​ | (824) | ​ | ​ | (728) | ​ | ​ | (322) | ​
Other comprehensive income (loss) before taxes | ​ | ​ | 15,028 | ​ | ​ | (64,817) | ​ |  | (9,700) | ​
Income tax expense (benefit) | ​ |  | 3,043 | ​ |  | (13,995) | ​ |  | (2,037) | ​
Other comprehensive income (loss) | ​ | $ | 11,985 | ​ | $ | (50,822) | ​ | $ | (7,663) | ​
​
| (1) | Represents amounts reclassified out of accumulated comprehensive income (loss) and included in gains on sale of investment securities on the consolidated statements of income and comprehensive income.
| (2) | Represents amounts reclassified out of accumulated comprehensive income (loss) and included in the computation of net periodic pension expense. Refer to Note 15 included in these consolidated financial statements.

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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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