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Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Comprehensive Income (Loss) [Table Text Block] |
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
|  | For the Year Ended December 31, |  |  |
(dollars in thousands) |  | 2021 |  |  | 2020 |  |  | 2019 |  |  |
Sale of investment securities available-for-sale |  | $ | 195 |  |  | $ | 29 |  |  | $ | (280 | ) |  | Net gains (losses) on sale of investment securities
|  |  | (48 | ) |  |  | (6 | ) |  |  | 79 |  |  | Income tax expense
|  |  | 147 |  |  |  | 23 |  |  |  | (201 | ) |  |
Net interest (expense)/income on swaps |  |  | (1,873 | ) |  |  | (1,577 | ) |  |  | 677 |  |  | Interest expense
|  |  | 528 |  |  |  | 443 |  |  |  | (190 | ) |  | Income tax expense
|  |  | (1,345 | ) |  |  | (1,134 | ) |  |  | 487 |  |  |
Amortization of pension plan net actuarial gains/(losses) |  |  | (299 | ) |  |  | (301 | ) |  |  | (358 | ) |  | Salaries and employee benefits
|  |  | 84 |  |  |  | 84 |  |  |  | 101 |  |  | Income tax benefit
|  |  | (215 | ) |  |  | (217 | ) |  |  | (257 | ) |  |
Total reclassification |  | $ | (1,413 | ) |  | $ | (1,328 | ) |  | $ | 29 |  |  |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Accumulated other comprehensive (loss)/income as of December 31, 2021 and 2020 consisted of the following:
|  | 2021 |  |  | 2020 |
|  | (dollars in thousands) |
Investment securities available-for-sale, net of tax |  | $ | (484 | ) |  | $ | 7,859 |
Cash flow hedge, net of tax |  |  | 2,406 |  |  |  | (1,520 | )
Defined benefit pension and post-retirement plans, net of tax |  |  | (3,326 | ) |  |  | (3,542 | )
Total |  | $ | (1,404 | ) |  | $ | 2,797 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: 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=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + 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=124509347&loc=d3e526-108580 + Details
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