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Comprehensive Income/(Loss) (Tables) | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Components of Accumulated Other Comprehensive Income | The activity in accumulated other comprehensive income for the three months ended March 31, 2021 and 2020 is as follows:
|  | Accumulated Other Comprehensive Income/(Loss) (1) |
(unaudited, in thousands) |  | Defined Benefit Plans |  |  | Unrealized Gains (Losses) on Debt Securities Available-for-Sale |  |  | Unrealized Gains on Debt Securities Transferred from Available-for-Sale to Held-to-Maturity |  |  | Total |
Balance at December 31, 2020 |  | $ | (15,502 | ) |  | $ | 46,861 |  |  | $ | — |  |  | $ | 31,359 |
Other comprehensive income/(loss) before reclassifications |  |  | — |  |  |  | (22,026 | ) |  |  | — |  |  |  | (22,026 | )
Amounts reclassified from accumulated other comprehensive income/(loss) |  |  | 472 |  |  |  | (2 | ) |  |  | — |  |  |  | 470 |
Period change |  |  | 472 |  |  |  | (22,028 | ) |  |  | — |  |  |  | (21,556 | )
Balance at March 31, 2021 |  | $ | (15,030 | ) |  | $ | 24,833 |  |  | $ | — |  |  | $ | 9,803 |
Balance at December 31, 2019 |  | $ | (17,468 | ) |  | $ | 18,644 |  |  | $ | 25 |  |  | $ | 1,201 |
Other comprehensive income/(loss) before reclassifications |  | — |  |  |  | 41,116 |  |  | — |  |  |  | 41,116 |
Amounts reclassified from accumulated other comprehensive income/(loss) |  |  | 569 |  |  |  | (1,743 | ) |  |  | (2 | ) |  |  | (1,176 | )
Period change |  |  | 569 |  |  |  | 39,373 |  |  |  | (2 | ) |  |  | 39,940 |
Balance at March 31, 2020 |  | $ | (16,899 | ) |  | $ | 58,017 |  |  | $ | 23 |  |  | $ | 41,141 |
(1) | All amounts are net of tax. Related income tax expense or benefit is calculated using a combined Federal and State income tax rate approximating 24% in both periods presented.
Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income | The following table provides details about amounts reclassified from accumulated other comprehensive income for the three months ended March 31, 2021 and 2020:
Details about Accumulated Other Comprehensive Income/(Loss) Components |  | For the Three Months Ended March 31, |  |  | Affected Line Item in the Statement of Comprehensive Income
(unaudited, in thousands) |  | 2021 |  |  | 2020 |  |  |
Debt securities available-for-sale (1): |  |  |  |  |  |  |  |  |  |
Net securities gains reclassified into earnings |  | $ | (3 | ) |  | $ | (2,287 | ) |  | Net securities gains (Non-interest income)
Related income tax expense ⁽²⁾ |  |  | 1 |  |  |  | 544 |  |  | Provision for income taxes
Net effect on accumulated other comprehensive income for the period |  |  | (2 | ) |  |  | (1,743 | ) |  |
Debt securities held-to-maturity (1): |  |  |  |  |  |  |  |  |  |
Amortization of unrealized gain transferred from available-for-sale |  |  | — |  |  |  | (3 | ) |  | Interest and dividends on securities (Interest and dividend income)
Related income tax expense ⁽²⁾ |  |  | — |  |  |  | 1 |  |  | Provision for income taxes
Net effect on accumulated other comprehensive income for the period |  |  | — |  |  |  | (2 | ) |  |
Defined benefit plans (3): |  |  |  |  |  |  |  |  |  |
Amortization of net loss and prior service costs |  |  | 622 |  |  |  | 746 |  |  | Employee benefits (Non-interest expense)
Related income tax benefit ⁽²⁾ |  |  | (150 | ) |  |  | (177 | ) |  | Provision for income taxes
Net effect on accumulated other comprehensive income for the period |  |  | 472 |  |  |  | 569 |  |  |
Total reclassifications for the period |  | $ | 470 |  |  | $ | (1,176 | ) |  |
(1) | For additional detail related to unrealized gains on securities and related amounts reclassified from accumulated other comprehensive income, see Note 3, “Securities.”
(2) | Income tax expense or benefit is calculated using a combined Federal and State income tax rate approximating 24% in both periods presented.
(3) | Included in the computation of net periodic pension cost. See Note 6, “Benefit Plans” for additional detail.

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + 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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