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Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2015
Other Comprehensive Income (Loss) [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Other comprehensive income (loss) components, net of tax, are shown in the following table for the years ended December 31, 2015, 2014 and 2013.
Year ended December 31, (in thousands) |  | Changes in Pension Plan assets and benefit obligations |  | Unrealized gains and losses on available-for-sale securities |  | Total
Beginning balance at December 31, 2014 |  | $ | (14,865 | ) |  | $ | 1,257 |  |  | $ | (13,608 | )
| Other comprehensive (loss) before reclassifications |  | (910 | ) |  | (1,549 | ) |  | (2,459 | )
| Amounts reclassified from accumulated other comprehensive loss |  | 424 |  |  | — |  |  | 424 |
Net current period other comprehensive loss |  | (486 | ) |  | (1,549 | ) |  | (2,035 | )
Ending balance at December 31, 2015 |  | $ | (15,351 | ) |  | $ | (292 | ) |  | $ | (15,643 | )
Beginning balance at December 31, 2013 |  | $ | (5,598 | ) |  | $ | (29,821 | ) |  | $ | (35,419 | )
| Other comprehensive (loss) gain before reclassifications |  | (9,279 | ) |  | 30,325 |  |  | 21,046 |
| Amounts reclassified from accumulated other comprehensive loss |  | 12 |  |  | 753 |  |  | 765 |
Net current period other comprehensive (loss) income |  | (9,267 | ) |  | 31,078 |  |  | 21,811 |
Ending balance at December 31, 2014 |  | $ | (14,865 | ) |  | $ | 1,257 |  |  | $ | (13,608 | )
Beginning balance at December 31, 2012 |  | $ | (27,134 | ) |  | $ | 9,616 |  |  | $ | (17,518 | )
| Other comprehensive gain (loss) before reclassifications |  | 19,766 |  |  | (39,448 | ) |  | (19,682 | )
| Amounts reclassified from accumulated other comprehensive loss |  | 1,770 |  |  | 11 |  |  | 1,781 |
Net current period other comprehensive income (loss) |  | 21,536 |  |  | (39,437 | ) |  | (17,901 | )
Ending balance at December 31, 2013 |  | $ | (5,598 | ) |  | $ | (29,821 | ) |  | $ | (35,419 | )
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, 2015, 2014 and 2013:
|  | Amount Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Affected Line Item in the Statement of Income
(In thousands) |  | 2015 | 2014 | 2013 |  |
Amortization of defined benefit pension items |  |  |  |  |  |
| Amortization of prior service cost |  | $ | 15 |  | $ | 19 |  | $ | 20 |  |  | Employee benefits
| Amortization of net loss |  | 637 |  | — |  | 2,703 |  |  | Employee benefits
Total income before income taxes |  | 652 |  | 19 |  | 2,723 |  |  | Total income before income taxes
| Federal income taxes |  | 228 |  | 7 |  | 953 |  |  | Federal income taxes
| Net of tax |  | $ | 424 |  | $ | 12 |  | $ | 1,770 |  |  | Net of tax
Unrealized gains & losses on available for sale securities |  |  |  |  |  |
| Loss on sale of investment securities |  | $ | — |  | $ | 1,158 |  | $ | — |  |  | Gain (loss) on sale of investment securities
| Other than temporary impairment |  | — |  | — |  | 17 |  |  | Miscellaneous expense
Total income before income taxes |  | — |  | 1,158 |  | 17 |  |  | Total income before income taxes
| Federal income taxes |  | — |  | 405 |  | 6 |  |  | Federal income taxes
| Net of tax |  | $ | — |  | $ | 753 |  | $ | 11 |  |  | Net of tax

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e526-108580 + Details
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