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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) | 9 Months Ended
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Sep. 30, 2017
Statement of Comprehensive Income [Abstract] |
Comprehensive Income (Loss) Note [Text Block] | Other Comprehensive Income Other comprehensive income components, net of tax, are shown in the following table for the three-month and nine-month periods ended September 30, 2017 and 2016:
(in thousands) |  | Changes in pension plan assets and benefit obligations |  | Unrealized gains (losses) on available for sale securities |  | Total
Beginning balance at July 1, 2017 |  | $ | (14,740 | ) |  | $ | 1,028 |  |  | $ | (13,712 | )
| Other comprehensive income before reclassifications |  | — |  |  | 707 |  |  | 707 |
| Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | — |  |  | — |
Net current period other comprehensive income |  | — |  |  | 707 |  |  | 707 |
Ending balance at September 30, 2017 |  | $ | (14,740 | ) |  | $ | 1,735 |  |  | $ | (13,005 | )
Beginning balance at July 1, 2016 |  | $ | (15,351 | ) |  | $ | 15,740 |  |  | $ | 389 |
| Other comprehensive loss before reclassifications |  | — |  |  | (2,182 | ) |  | (2,182 | )
| Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | — |  |  | — |
Net current period other comprehensive loss |  | — |  |  | (2,182 | ) |  | (2,182 | )
Ending balance at September 30, 2016 |  | $ | (15,351 | ) |  | $ | 13,558 |  |  | $ | (1,793 | )
(in thousands) |  | Changes in pension plan assets and benefit obligations |  | Unrealized gains (losses) on available for sale securities |  | Total
Beginning balance at January 1, 2017 |  | $ | (14,740 | ) |  | $ | (3,005 | ) |  | $ | (17,745 | )
| Other comprehensive income before reclassifications |  | — |  |  | 4,740 |  |  | 4,740 |
| Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | — |  |  | — |
Net current period other comprehensive income |  | — |  |  | 4,740 |  |  | 4,740 |
Ending balance at September 30, 2017 |  | $ | (14,740 | ) |  | $ | 1,735 |  |  | $ | (13,005 | )
Beginning balance at January 1, 2016 |  | $ | (15,351 | ) |  | $ | (292 | ) |  | $ | (15,643 | )
| Other comprehensive income before reclassifications |  | — |  |  | 13,850 |  |  | 13,850 |
| Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | — |  |  | — |
Net current period other comprehensive income |  | — |  |  | 13,850 |  |  | 13,850 |
Ending balance at September 30, 2016 |  | $ | (15,351 | ) |  | $ | 13,558 |  |  | $ | (1,793 | )
During the three-month and nine-month periods ended September 30, 2017 and 2016, there were no reclassifications out of accumulated other comprehensive income.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
Name: | us-gaap_ComprehensiveIncomeNoteTextBlock
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