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Noninterest Income and Noninterest Expense (Tables) | 9 Months Ended
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Sep. 30, 2021
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 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Three Months Ended September 30, | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | Salaries and employee benefits | ​ | $ | — | ​ | $ | — | ​ | $ | 218 | ​ | $ | 195
Interest cost | ​ | Other noninterest expense | ​ | ​ | 1,292 | ​ | ​ | 1,639 | ​ | ​ | 116 | ​ | ​ | 156
Expected return on plan assets | ​ | Other noninterest expense | ​ | ​ | (766) | ​ | ​ | (1,206) | ​ | ​ | — | ​ | ​ | —
Prior service credit | ​ | Other noninterest expense | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (12)
Recognized net actuarial loss (gain) | ​ | Other noninterest expense | ​ | ​ | 1,720 | ​ | ​ | 1,474 | ​ | ​ | — | ​ | ​ | (80)
Total net periodic benefit cost | ​ | ​ | ​ | $ | 2,246 | ​ | $ | 1,907 | ​ | $ | 334 | ​ | $ | 259
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | Salaries and employee benefits | ​ | $ | — | ​ | $ | — | ​ | $ | 746 | ​ | $ | 573
Interest cost | ​ | Other noninterest expense | ​ | ​ | 3,754 | ​ | ​ | 4,881 | ​ | ​ | 378 | ​ | ​ | 484
Expected return on plan assets | ​ | Other noninterest expense | ​ | ​ | (2,298) | ​ | ​ | (3,594) | ​ | ​ | — | ​ | ​ | —
Prior service credit | ​ | Other noninterest expense | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (38)
Recognized net actuarial loss (gain) | ​ | Other noninterest expense | ​ | ​ | 5,160 | ​ | ​ | 4,332 | ​ | ​ | — | ​ | ​ | (132)
Total net periodic benefit cost | ​ | ​ | ​ | $ | 6,616 | ​ | $ | 5,619 | ​ | $ | 1,124 | ​ | $ | 887

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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