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Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2018
Other Comprehensive Income (Loss) [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Other comprehensive income (loss) components, net of income tax, are shown in the following table for the years ended December 31, 2018, 2017 and 2016.
Year ended December 31, (in thousands) |  | Changes in Pension Plan assets and benefit obligations |  | Unrealized gains and losses on AFS debt securities |  | Total
Beginning balance at January 1, 2018, as previously presented |  | $ | (23,526 | ) |  | $ | (2,928 | ) |  | $ | (26,454 | )
| Cumulative effect of change in accounting principle for marketable equity securities, net of tax |  | — |  |  | (995 | ) |  | (995 | )
Beginning balance at January 1, 2018, as adjusted |  | (23,526 | ) |  | (3,923 | ) |  | (27,449 | )
| Reclassification of disproportionate income tax effects |  | (3,175 | ) |  | (631 | ) |  | (3,806 | )
Net current period activity |  |  |  |  |  |
| Other comprehensive loss before reclassifications |  | (4,046 | ) |  | (17,586 | ) |  | (21,632 | )
| Amounts reclassified from accumulated other comprehensive loss |  | 1,075 |  |  | 2,024 |  |  | 3,099 |
Net current period other comprehensive loss |  | (2,971 | ) |  | (15,562 | ) |  | (18,533 | )
Ending balance at December 31, 2018 |  | $ | (29,672 | ) |  | $ | (20,116 | ) |  | $ | (49,788 | )
Beginning balance at January 1, 2017 |  | $ | (14,740 | ) |  | $ | (3,005 | ) |  | $ | (17,745 | )
| Other comprehensive (loss) gain before reclassifications |  | (9,241 | ) |  | 1,261 |  |  | (7,980 | )
| Amounts reclassified from accumulated other comprehensive loss |  | 455 |  |  | (1,184 | ) |  | (729 | )
Net current period other comprehensive (loss) income |  | (8,786 | ) |  | 77 |  |  | (8,709 | )
Ending balance at December 31, 2017 |  | $ | (23,526 | ) |  | $ | (2,928 | ) |  | $ | (26,454 | )
Beginning balance at January 1, 2016 |  | $ | (15,351 | ) |  | $ | (292 | ) |  | $ | (15,643 | )
| Other comprehensive gain (loss) before reclassifications |  | 109 |  |  | (2,713 | ) |  | (2,604 | )
| Amounts reclassified from accumulated other comprehensive loss |  | 502 |  |  | — |  |  | 502 |
Net current period other comprehensive income (loss) |  | 611 |  |  | (2,713 | ) |  | (2,102 | )
Ending balance at December 31, 2016 |  | $ | (14,740 | ) |  | $ | (3,005 | ) |  | $ | (17,745 | )
Schedule of components of other comprehensive income (loss) | The following table provides information concerning amounts reclassified out of accumulated other comprehensive loss for the years ended December 31, 2018, 2017 and 2016:
|  | Amount Reclassified from Accumulated Other Comprehensive Loss |  | Affected Line Item in the Consolidated Statements of Income
(In thousands) |  | 2018 | 2017 | 2016 |  |
Amortization of defined benefit pension items |  |  |  |  |  |
| Amortization of net loss |  | 1,361 |  | 576 |  | 773 |  |  | Employee benefits
Income before income taxes |  | 1,361 |  | 576 |  | 773 |  |  | Income before income taxes
| Income taxes |  | 286 |  | 121 |  | 271 |  |  | Income taxes
| Net of income tax |  | $ | 1,075 |  | $ | 455 |  | $ | 502 |  |  | Net income
Unrealized gains & losses on available for sale securities |  |  |  |  |  |
| Loss (gain) on the sale of investment securities |  | $ | 2,562 |  | $ | (1,821 | ) | $ | — |  |  | Net (loss) gain on the sale of investment securities
Income before income taxes |  | 2,562 |  | (1,821 | ) | — |  |  | Income before income taxes
| Income taxes |  | 538 |  | (637 | ) | — |  |  | Income taxes
| Net of income tax |  | $ | 2,024 |  | $ | (1,184 | ) | $ | — |  |  | Net income

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- Definition Other Comprehensive Income (Loss) + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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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=114867106&loc=d3e526-108580 + Details
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