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Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following table represents the reclassification out of accumulated other comprehensive (loss) income for the periods presented:
Details about Accumulated Other |  | Amounts Reclassified from Accumulated |  | Affected Line item in the
Comprehensive Income Components |  | Other Comprehensive Income |  | Statement Where Net Income is Presented
|  | Three Months Ended |  | Six Months Ended |  |
|  | June 30, |  | June 30, |  |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |  |
|  | (dollars in thousands) |
Sale of investment securities available for sale |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 1,596 |  |  | Net gains on sale of securities available-for-sale
|  | - |  |  |  | - |  |  |  | - |  |  |  | (579 | ) |  | Income tax expense
|  | - |  |  |  | - |  |  |  | - |  |  |  | 1,017 |  |  |
Amortization of pension plan net actuarial losses |  |  | (91 | ) |  |  | (103 | ) |  |  | (182 | ) |  |  | (206 | ) |  | Salaries and employee benefits
|  | 25 |  |  |  | 42 |  |  |  | 50 |  |  |  | 84 |  |  | Income tax benefit
|  | (66 | ) |  |  | (61 | ) |  |  | (132 | ) |  |  | (122 | ) |  |
Total reclassification |  | $ | (66 | ) |  | $ | (61 | ) |  | $ | (132 | ) |  | $ | 895 |  |
Comprehensive Income (Loss) [Table Text Block] | Accumulated other comprehensive loss at June 30, 2018 and December 31, 2017 consisted of the following:
|  | June 30, |  | December 31,
|  | 2018 |  | 2017
|  | (dollars in thousands)
Investment securities available-for-sale, net of tax |  | $ | (6,096 | ) |  | $ | (902 | )
Cash flow hedge, net of tax |  |  | 1,361 |  |  |  | 472 |
Defined benefit pension and post-retirement plans, net of tax |  |  | (3,912 | ) |  |  | (3,589 | )
Total |  | $ | (8,647 | ) |  | $ | (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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