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Noninterest Income and Noninterest Expense (Tables) | 3 Months Ended
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Mar. 31, 2024
Noninterest Income and Noninterest Expense |
Schedule of components of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Income line item where recognized in | ​ | Pension Benefits | ​ | Other Benefits
(dollars in thousands) | ​ | the consolidated statements of income |  | 2024 |  | 2023 |  | 2024 |  | 2023
Three Months Ended March 31, | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | Salaries and employee benefits | ​ | $ | — | ​ | $ | — | ​ | $ | 137 | ​ | $ | 147
Interest cost | ​ | Other noninterest expense | ​ | ​ | 1,906 | ​ | ​ | 2,059 | ​ | ​ | 211 | ​ | ​ | 220
Expected return on plan assets | ​ | Other noninterest expense | ​ | ​ | (878) | ​ | ​ | (883) | ​ | ​ | — | ​ | ​ | —
Recognized net actuarial loss (gain) | ​ | Other noninterest expense | ​ | ​ | 503 | ​ | ​ | 719 | ​ | ​ | (322) | ​ | ​ | (379)
Total net periodic benefit cost | ​ | ​ | ​ | $ | 1,531 | ​ | $ | 1,895 | ​ | $ | 26 | ​ | $ | (12)

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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