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Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Text Block [Abstract] |
Comprehensive Income (Loss) [Table Text Block] | Total comprehensive income includes all changes in equity during a period from transactions and other events and circumstances from nonowner sources. The Company’s other comprehensive income (loss) is comprised of unrealized holding gains and losses on securities available-for-sale, obligations for defined benefit pension plan and an adjustment to reflect the curtailment of the Company’s defined benefit pension plan, net of taxes.
Details about Accumulated Other Comprehensive Income Components |  | Amounts Reclassified from Accumulated Other Comprehensive Income |  |  | Affected Line Item in the Consolidated Statements of Income
|  | Twelve Months Ended December 31, |  |  |
(dollars in thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |  |  |
Sale of investment securities available-for-sale |  | $ | 1,596 |  |  | $ | 4,234 |  |  | $ | 3,931 |  |  | Net gains on sale of investment securities
|  |  | (579) |  |  |  | (1,682) |  |  |  | (1,564) |  |  | Income tax expense
|  |  | 1,017 |  |  |  | 2,552 |  |  |  | 2,367 |  |  |
Amortization of unrealized holding (losses) gains on securities transferred from available-for-sale to held-to-maturity |  |  | - |  |  |  | (1,986) |  |  |  | (220) |  |  | Interest income
|  |  | - |  |  |  | 813 |  |  |  | 90 |  |  | Income tax benefit
|  |  | - |  |  |  | (1,173) |  |  |  | (130) |  |  |
Amortization of pension plan net actuarial losses |  |  | (412) |  |  |  | (407) |  |  |  | (433) |  |  | Salaries and employee benefits
|  |  | 169 |  |  |  | 165 |  |  |  | 177 |  |  | Income tax benefit
|  |  | (243) |  |  |  | (242) |  |  |  | (256) |  |  |
Total reclassification |  | $ | 774 |  |  | $ | 1,137 |  |  | $ | 1,981 |  |  |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Accumulated other comprehensive loss at December 31, 2017 and 2016 consisted of the following:
|  | 2017 |  |  | 2016 |
|  | (dollars in thousands) |
Investment securities available-for-sale, net of tax |  | $ | (902) |  |  | $ | 933 |
Cash flow hedge, net of tax |  |  | 472 |  |  |  | 52 |
Unamortized component of securities transferred from available-for-sale to held-to-maturity, net of tax |  |  | - |  |  |  | - |
Defined benefit pension and post-retirement plans, net of tax |  |  | (3,589) |  |  |  | (3,831) |
Total |  | $ | (4,019) |  |  | $ | (2,846) |

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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=84228862&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=84228862&loc=d3e526-108580 + Details
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