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Accumulated Other Comprehensive Loss | 12 Months Ended
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Dec. 31, 2023
Accumulated Other Comprehensive Loss |
Accumulated Other Comprehensive Loss | 19. Accumulated Other Comprehensive Loss: The components of accumulated other comprehensive loss included in stockholders’ equity at December 31, 2023 and 2022 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(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) | ​
​ 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 The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//220/tableOfContent + Details
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