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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) |
Schedule of components of accumulated other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | December 31, 2021 |  | ​ | December 31, 2020 |
Net unrealized gain (loss) on investment securities available-for-sale | ​ | $ | (1,791) | ​ | $ | 9,696 | ​
Income tax expense (benefit) | ​ |  | (376) | ​ |  | 2,036 | ​
Net of income taxes | ​ |  | (1,415) | ​ |  | 7,660 | ​
Benefit plan adjustments | ​ |  | (5,868) | ​ |  | (7,977) | ​
Income tax benefit | ​ |  | (1,232) | ​ |  | (1,675) | ​
Net of income taxes | ​ |  | (4,636) | ​ |  | (6,302) | ​
Derivative adjustments | ​ |  | 680 | ​ |  | 1,002 | ​
Income tax | ​ |  | 143 | ​ |  | 211 | ​
Net of income taxes | ​ |  | 537 | ​ |  | 791 | ​
Accumulated other comprehensive income (loss) | ​ | $ | (5,514) | ​ | $ | 2,149 | ​
Schedule of other comprehensive income (loss) and related tax effects | Other comprehensive income (loss) and related tax effects for the years ended December 31, 2021, 2020 and 2019 are as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year Ended December 31, |  | 2021 |  | 2020 | ​ | 2019 | ​
Unrealized gain (loss) on investment securities available-for-sale | ​ | $ | (11,487) | ​ | $ | 8,779 | ​ | $ | 5,109 | ​
Net gain on the sale of investment securities available-for-sale (1) | ​ | ​ | ​ | ​ | ​ | (918) | ​ | ​ | (23) | ​
Other comprehensive income on available-for-sale debt securities | ​ | ​ | (11,487) | ​ | ​ | 7,861 | ​ | ​ | 5,086 | ​
Benefit plans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of actuarial loss (2) | ​ | ​ | 301 | ​ | ​ | 218 | ​ | ​ | 227 | ​
Actuarial gain (loss) | ​ | ​ | 1,808 | ​ | ​ | (1,616) | ​ | ​ | 412 | ​
Net change in benefit plan liabilities | ​ |  | 2,109 | ​ |  | (1,398) | ​ |  | 639 | ​
Net change in derivatives | ​ | ​ | (322) | ​ | ​ | 315 | ​ | ​ | 441 | ​
Other comprehensive loss before taxes | ​ | ​ | (9,700) | ​ | ​ | 6,778 | ​ |  | 6,166 | ​
Income tax (benefit) | ​ |  | (2,037) | ​ |  | 1,424 | ​ |  | 1,295 | ​
Other comprehensive income (loss) | ​ | $ | (7,663) | ​ | $ | 5,354 | ​ | $ | 4,871 | ​
​
| (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 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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