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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2021
Employee Benefit Plans |
Schedule of net periodic benefit costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
(Dollars in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020 |
Components of net periodic benefit cost: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost, included in salaries and employee benefits | ​ | $ | 493 | ​ | $ | 401 | ​ | $ | 1,478 | ​ | $ | 1,202 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other components of net periodic benefit cost: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest cost | ​ |  | 114 | ​ |  | 138 | ​ |  | 343 | ​ |  | 413 | ​
Expected return on plan assets | ​ |  | (433) | ​ |  | (374) | ​ |  | (1,300) | ​ |  | (1,119) | ​
Amortization of prior service credit | ​ |  | (17) | ​ |  | (17) | ​ |  | (51) | ​ |  | (51) | ​
Recognized net actuarial losses | ​ |  | 61 | ​ |  | 49 | ​ |  | 182 | ​ |  | 148 | ​
Other components of net periodic benefit cost, included in other noninterest income | ​ | ​ | (275) | ​ | ​ | (204) | ​ | ​ | (826) | ​ | ​ | (609) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net periodic benefit cost | ​ | $ | 218 | ​ | $ | 197 | ​ | $ | 652 | ​ | $ | 593 | ​

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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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