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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) | 6 Months Ended
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Jun. 30, 2018
Statement of Comprehensive Income [Abstract] |
Comprehensive Income (Loss) Note [Text Block] | Other Comprehensive Income (Loss) Accumulated 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, 2018 and 2017:
(in thousands) |  | Changes in pension plan assets and benefit obligations |  | Change in unrealized losses on debt securities |  | Total
Beginning balance at April 1, 2018 |  | $ | (26,701 | ) |  | $ | (25,940 | ) |  | $ | (52,641 | )
| Other comprehensive loss before reclassifications |  | — |  |  | (2,368 | ) |  | (2,368 | )
| Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | — |  |  | — |
Activity for the period |  | — |  |  | (2,368 | ) |  | (2,368 | )
Ending balance at June 30, 2018 |  | $ | (26,701 | ) |  | $ | (28,308 | ) |  | $ | (55,009 | )
Beginning balance at April 1, 2017 |  | $ | (14,740 | ) |  | $ | (1,983 | ) |  | $ | (16,723 | )
| Other comprehensive income before reclassifications |  | — |  |  | 3,011 |  |  | 3,011 |
| Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | — |  |  | — |
Net current period other comprehensive income |  | — |  |  | 3,011 |  |  | 3,011 |
Ending balance at June 30, 2017 |  | $ | (14,740 | ) |  | $ | 1,028 |  |  | $ | (13,712 | )
(in thousands) |  | Changes in pension plan assets and benefit obligations |  | Change in unrealized losses on debt securities |  | Total
Beginning balance at January 1, 2018 |  | $ | (23,526 | ) |  | $ | (2,928 | ) |  | $ | (26,454 | )
| Other comprehensive loss before reclassifications |  | — |  |  | (25,778 | ) |  | (25,778 | )
| Reclassification of disproportionate income tax effects |  | (3,175 | ) |  | (631 | ) |  | (3,806 | )
| Cumulative effect of change in accounting principle for marketable equity securities, net of tax |  | — |  |  | (995 | ) |  | (995 | )
| Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | 2,024 |  |  | 2,024 |
Activity for the period |  | (3,175 | ) |  | (25,380 | ) |  | (28,555 | )
Ending balance at June 30, 2018 |  | $ | (26,701 | ) |  | $ | (28,308 | ) |  | $ | (55,009 | )
Beginning balance at January 1, 2017 |  | $ | (14,740 | ) |  | $ | (3,005 | ) |  | $ | (17,745 | )
| Other comprehensive income before reclassifications |  | — |  |  | 4,033 |  |  | 4,033 |
| Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | — |  |  | — |
Net current period other comprehensive income |  | — |  |  | 4,033 |  |  | 4,033 |
Ending balance at June 30, 2017 |  | $ | (14,740 | ) |  | $ | 1,028 |  |  | $ | (13,712 | )
During the six-month period ended June 30, 2018, there was $2.6 million ($2.0 million net of tax) reclassified out of accumulated other comprehensive loss due to losses on the sale of AFS debt securities. These losses were recorded within net loss on sale of investment securities on the consolidated condensed statements of income. During the three-month periods ended June 30, 2018 and June 30, 2017 and the six-month period ended June 30, 2017, there were no reclassifications out of accumulated other comprehensive loss.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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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