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OCI Net of Tax | 6 Months Ended
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Jun. 30, 2024
Statement of Comprehensive Income [Abstract] |
Comprehensive Income (Loss) [Table Text Block] | Other comprehensive income (loss) components, net of tax, are shown in the following table for the three-month and the six-month periods ended June 30, 2024 and 2023:
(in thousands) |  | Changes in pension plan assets and benefit obligations |  | Unrealized losses on debt securities AFS |  | Total
Beginning balance at April 1, 2024 |  | $ | 1,692 |  |  | $ | (68,087) |  |  | $ | (66,395) |
| Other comprehensive loss before reclassifications |  | — |  |  | (2,059) |  |  | (2,059) |
Net current period other comprehensive loss |  | — |  |  | (2,059) |  |  | (2,059) |
Ending balance at June 30, 2024 |  | $ | 1,692 |  |  | $ | (70,146) |  |  | $ | (68,454) |
Beginning balance at April 1, 2023 |  | $ | (6,680) |  |  | $ | (83,353) |  |  | $ | (90,033) |
| Other comprehensive loss before reclassifications |  | — |  |  | (6,753) |  |  | (6,753) |
Net current period other comprehensive loss |  | — |  |  | (6,753) |  |  | (6,753) |
Ending balance at June 30, 2023 |  | $ | (6,680) |  |  | $ | (90,106) |  |  | $ | (96,786) |
(in thousands) |  | Changes in pension plan assets and benefit obligations |  | Unrealized (losses) gains on debt securities AFS |  | Total
Beginning balance at January 1, 2024 |  | $ | 1,692 |  |  | $ | (67,883) |  |  | $ | (66,191) |
| Other comprehensive loss before reclassifications |  | — |  |  | (2,577) |  |  | (2,577) |
| Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | 314 |  | 314
Net current period other comprehensive loss |  | — |  |  | (2,263) |  |  | (2,263) |
Ending balance at June 30, 2024 |  | $ | 1,692 |  |  | $ | (70,146) |  |  | $ | (68,454) |
Beginning balance at January 1, 2023 |  | $ | (6,680) |  |  | $ | (95,714) |  |  | $ | (102,394) |
| Other comprehensive income before reclassifications |  | — |  |  | 5,608 |  |  | 5,608 |
Net current period other comprehensive income |  | — |  |  | 5,608 |  |  | 5,608 |
Ending balance at June 30, 2023 |  | $ | (6,680) |  |  | $ | (90,106) |  |  | $ | (96,786) |

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 1 -Section 45 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration