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Other Comprehensive Income (Loss) Net of Tax (Tables) | 6 Months Ended
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Jun. 30, 2020
Statement of Comprehensive Income [Abstract] |
Comprehensive Income (Loss) [Table Text Block] | Other comprehensive income (loss) components, net of income tax, are shown in the following table for the three-month and six-month periods ended June 30, 2020 and 2019:
(in thousands) |  |  | Changes in pension plan assets and benefit obligations |  | Unrealized net holding gain (loss) on cash flow hedge |  | Unrealized gains (losses) on AFS debt securities |  | Total
Beginning balance at April 1, 2020 |  |  | $ | (26,674) |  |  | $ | (937) |  |  | $ | 35,715 |  |  | $ | 8,104 |
| Other comprehensive income before reclassifications |  | — |  |  | 15 |  |  | 8,359 |  |  | 8,374 |
| Amounts reclassified from accumulated other comprehensive income |  | — |  |  | — |  |  | (2,617) |  |  | (2,617) |
Net current period other comprehensive income |  |  | — |  |  | 15 |  |  | 5,742 |  |  | 5,757 |
Ending balance at June 30, 2020 |  |  | $ | (26,674) |  |  | $ | (922) |  |  | $ | 41,457 |  |  | $ | 13,861 |
Beginning balance at April 1, 2019 |  |  | $ | (29,672) |  |  | $ | (206) |  |  | $ | (5,575) |  |  | $ | (35,453) |
| Other comprehensive (loss) income before reclassifications |  | — |  |  | (301) |  |  | 8,967 |  |  | 8,666 |
| Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | — |  |  | 480 |  |  | 480 |
Net current period other comprehensive (loss) income |  |  | — |  |  | (301) |  |  | 9,447 |  |  | 9,146 |
Ending balance at June 30, 2019 |  |  | $ | (29,672) |  |  | $ | (507) |  |  | $ | 3,872 |  |  | $ | (26,307) |
(in thousands) |  |  | Changes in pension plan assets and benefit obligations |  | Unrealized net holding gain (loss) on cash flow hedge |  | Unrealized gains (losses) on AFS debt securities |  | Total
Beginning balance at January 1, 2020 |  |  | $ | (26,674) |  |  | $ | (454) |  |  | $ | 17,539 |  |  | $ | (9,589) |
| Other comprehensive (loss) income before reclassifications |  | — |  |  | (468) |  |  | 26,535 |  |  | 26,067 |
| Amounts reclassified from accumulated other comprehensive income |  | — |  |  | — |  |  | (2,617) |  |  | (2,617) |
Net current period other comprehensive (loss) income |  |  | — |  |  | (468) |  |  | 23,918 |  |  | 23,450 |
Ending balance at June 30, 2020 |  |  | $ | (26,674) |  |  | $ | (922) |  |  | $ | 41,457 |  |  | $ | 13,861 |
Beginning balance at January 1, 2019 |  |  | $ | (29,672) |  |  | $ | — |  |  | $ | (20,116) |  |  | $ | (49,788) |
| Other comprehensive (loss) income before reclassifications |  | — |  |  | (507) |  |  | 23,508 |  |  | 23,001 |
| Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | — |  |  | 480 |  |  | 480 |
Net current period other comprehensive (loss) income |  |  | — |  |  | (507) |  |  | 23,988 |  |  | 23,481 |
Ending balance at June 30, 2019 |  |  | $ | (29,672) |  |  | $ | (507) |  |  | $ | 3,872 |  |  | $ | (26,307) |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e526-108580 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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