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Accumulated Other Comprehensive Income (Loss) | 12 Months Ended
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Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) |
Accumulated Other Comprehensive Income (Loss) | 21. Accumulated Other Comprehensive Income (Loss): The components of accumulated other comprehensive (loss) included in stockholders’ equity at December 31, 2022 and 2021 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | ​ | December 31, 2022 |  | ​ | December 31, 2021 |
Net unrealized loss on investment securities available-for-sale | ​ | $ | (66,250) | ​ | $ | (1,791) | ​
Income tax benefit | ​ |  | (14,266) | ​ |  | (376) | ​
Net of income taxes | ​ |  | (51,984) | ​ |  | (1,415) | ​
Benefit plan adjustments | ​ |  | (5,499) | ​ |  | (5,868) | ​
Income tax benefit | ​ |  | (1,184) | ​ |  | (1,232) | ​
Net of income taxes | ​ |  | (4,315) | ​ |  | (4,636) | ​
Derivative adjustments | ​ |  | (47) | ​ |  | 680 | ​
Income tax (benefit) expense | ​ |  | (10) | ​ |  | 143 | ​
Net of income taxes | ​ |  | (37) | ​ |  | 537 | ​
Accumulated other comprehensive loss | ​ | $ | (56,336) | ​ | $ | (5,514) | ​
​ Other comprehensive income (loss) and related tax effects for the years ended December 31, 2022, 2021 and 2020 are as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2022 |  | 2021 | ​ | 2020 | ​
Unrealized loss on investment securities available-for-sale | ​ | $ | (66,435) | ​ | $ | (11,487) | ​ | $ | 8,779 | ​
Net loss (gain) on the sale of investment securities available-for-sale (1) | ​ | ​ | 1,976 | ​ | ​ | ​ | ​ | ​ | (918) | ​
Other comprehensive (loss) income on available-for-sale debt securities | ​ | ​ | (64,459) | ​ | ​ | (11,487) | ​ | ​ | 7,861 | ​
Benefit plans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of actuarial loss (2) | ​ | ​ | 198 | ​ | ​ | 301 | ​ | ​ | 218 | ​
Actuarial gain (loss) | ​ | ​ | 172 | ​ | ​ | 1,808 | ​ | ​ | (1,616) | ​
Net change in benefit plan liabilities | ​ |  | 370 | ​ |  | 2,109 | ​ |  | (1,398) | ​
Net change in derivatives | ​ | ​ | (728) | ​ | ​ | (322) | ​ | ​ | 315 | ​
Other comprehensive(loss) income before taxes | ​ | ​ | (64,817) | ​ | ​ | (9,700) | ​ |  | 6,778 | ​
Income (benefit) tax | ​ |  | (13,995) | ​ |  | (2,037) | ​ |  | 1,424 | ​
Other comprehensive (loss) income | ​ | $ | (50,822) | ​ | $ | (7,663) | ​ | $ | 5,354 | ​
​
| (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 17 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI https://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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