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Comprehensive Income/Loss (Tables) | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Comprehensive income | The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in Note 15 "Employee Benefit Plans" within the Notes to the Consolidated Financial Statements included in Item 8 of the Company's 2020 Form 10-K.
Company's accumulated other comprehensive loss, net of tax | Information on the Company’s accumulated other comprehensive income (loss), net of tax, is comprised of the following components as of the dates indicated:
| Unrealized Gain (Loss) on Securities |  | Unrealized Gain on Cash Flow Hedge |  |  |  | Defined Benefit Postretirement Plans |  | Accumulated Other Comprehensive Income (Loss)
| (Dollars in thousands)
| 2021
Beginning balance: January 1, 2021 | $ | 13,255 |  |  | $ | 33,276 |  |  |  |  | $ | (5,836) |  |  | $ | 40,695 |
Net change in other comprehensive income (loss) | (7,774) |  |  | (6,583) |  |  |  |  | 819 |  |  | (13,538) |
Ending balance: March 31, 2021 | $ | 5,481 |  |  | $ | 26,693 |  |  |  |  | $ | (5,017) |  |  | $ | 27,157 |
| 2020
Beginning balance: January 1, 2020 | $ | 4,398 |  |  | $ | 16,479 |  |  |  |  | $ | (2,708) |  |  | $ | 18,169 |
Net change in other comprehensive income (loss) | 9,347 |  |  | 22,984 |  |  |  |  | (772) |  |  | 31,559 |
Ending balance: March 31, 2020 | $ | 13,745 |  |  | $ | 39,463 |  |  |  |  | $ | (3,480) |  |  | $ | 49,728 |

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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=121641772&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=121641772&loc=d3e526-108580 + Details
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