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Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [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 (Loss) Components |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  | Affected Line Item in the Consolidated Statements of Income
|  | Year ended December 31, |  |  |
(dollars in thousands) |  | 2018 |  |  | 2017 |  |  | 2016 |  |  |
Sale of investment securities available-for-sale |  | $ | - |  |  | $ | 1,596 |  |  | $ | 4,234 |  |  | Net gains on sale of investment securities
|  |  | - |  |  |  | (579) |  |  |  | (1,682) |  |  | Income tax expense
|  |  | - |  |  |  | 1,017 |  |  |  | 2,552 |  |  |
Amortization of unrealized holding (losses) gains on securities transferred from available-for-sale to held-to-maturity |  |  | - |  |  |  | - |  |  |  | (1,986) |  |  | Interest income
|  |  | - |  |  |  | - |  |  |  | 813 |  |  | Income tax benefit
|  |  | - |  |  |  | - |  |  |  | (1,173) |  |  |
Amortization of pension plan net actuarial losses |  |  | (359) |  |  |  | (412) |  |  |  | (407) |  |  | Salaries and employee benefits
|  |  | 101 |  |  |  | 169 |  |  |  | 165 |  |  | Income tax benefit
|  |  | (258) |  |  |  | (243) |  |  |  | (242) |  |  |
Total reclassification |  | $ | (258) |  |  | $ | 774 |  |  | $ | 1,137 |  |  |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Accumulated other comprehensive loss at December 31, 2018 and 2017 consisted of the following:
|  | 2018 |  |  | 2017 |
|  | (dollars in thousands) |
Investment securities available-for-sale, net of tax |  | $ | (5,841) |  |  | $ | (902) |
Cash flow hedge, net of tax |  |  | 837 |  |  |  | 472 |
Defined benefit pension and post-retirement plans, net of tax |  |  | (3,785) |  |  |  | (3,589) |
Total |  | $ | (8,789) |  |  | $ | (4,019) |

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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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