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Noninterest Income and Noninterest Expense - Net periodic benefit cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Pension Plan |  |  |  |
Components of net periodic benefit cost |  |  |  |
Interest cost | $ 1,879 | $ 1,905 | $ 3,759 | $ 3,811
Expected return on plan assets | (876) | (878) | (1,752) | (1,756)
Recognized net actuarial loss (gain) | 383 | 503 | 766 | 1,006
Total net periodic benefit cost | 1,386 | 1,530 | 2,773 | 3,061
Other Postretirement Benefits Plan |  |  |  |
Components of net periodic benefit cost |  |  |  |
Interest cost | 225 | 211 | 450 | 422
Recognized net actuarial loss (gain) | (301) | (322) | (602) | (644)
Total net periodic benefit cost | 93 | 26 | 186 | 52
Other Postretirement Benefits Plan | Salaries and employee benefits |  |  |  |
Components of net periodic benefit cost |  |  |  |
Service cost | $ 169 | $ 137 | $ 338 | $ 274

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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