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Other Comprehensive Income (Loss) Net of Tax (Tables) | 3 Months Ended
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Mar. 31, 2021
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 periods ended March 31, 2021 and 2020:
(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, 2021 |  | $ | (34,421) |  |  | $ | (698) |  |  | $ | 40,690 |  |  | $ | 5,571 |
| Other comprehensive income (loss) before reclassifications |  | — |  |  | 125 |  |  | (13,597) |  |  | (13,472) |
Net current period other comprehensive income (loss) |  | — |  |  | 125 |  |  | (13,597) |  |  | (13,472) |
Ending balance at March 31, 2021 |  | $ | (34,421) |  |  | $ | (573) |  |  | $ | 27,093 |  |  | $ | (7,901) |
Beginning balance at January 1, 2020 |  | $ | (26,674) |  |  | $ | (454) |  |  | $ | 17,539 |  |  | $ | (9,589) |
| Other comprehensive (loss) income before reclassifications |  | — |  |  | (483) |  |  | 18,176 |  |  | 17,693 |
Net current period other comprehensive (loss) income |  | — |  |  | (483) |  |  | 18,176 |  |  | 17,693 |
Ending balance at March 31, 2020 |  | $ | (26,674) |  |  | $ | (937) |  |  | $ | 35,715 |  |  | $ | 8,104 |
During the three-month periods ended March 31, 2021 and 2020, there were no reclassifications out of accumulated other comprehensive income (loss).

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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=124509347&loc=d3e526-108580 + Details
Name: | us-gaap_ScheduleOfComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types: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