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Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Changes in the components of other comprehensive income | Changes in the components of other comprehensive income, net of tax, were as follows for the periods presented:
| Pre-Tax |  | Tax Expense (Benefit) |  | Net of Tax
Three months ended March 31, 2021 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding losses on securities | $ | (20,044) |  |  | $ | (5,101) |  |  | $ | (14,943) |
Reclassification adjustment for gains realized in net income | (1,357) |  |  | (345) |  |  | (1,012) |
Total securities available for sale | (21,401) |  |  | (5,446) |  |  | (15,955) |
Derivative instruments: |  |  |  |  |
Unrealized holding gains on derivative instruments | 14,734 |  |  | 3,750 |  |  | 10,984 |
Total derivative instruments | 14,734 |  |  | 3,750 |  |  | 10,984 |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 54 |  |  | 12 |  |  | 42 |
Total defined benefit pension and post-retirement benefit plans | 54 |  |  | 12 |  |  | 42 |
Total other comprehensive loss | $ | (6,613) |  |  | $ | (1,684) |  |  | $ | (4,929) |
Three months ended March 31, 2020 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding gains on securities | $ | 22,389 |  |  | $ | 5,695 |  |  | $ | 16,694 |
Total securities available for sale | 22,389 |  |  | 5,695 |  |  | 16,694 |
Derivative instruments: |  |  |  |  |
Unrealized holding losses on derivative instruments | (4,028) |  |  | (1,025) |  |  | (3,003) |
Total derivative instruments | (4,028) |  |  | (1,025) |  |  | (3,003) |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 62 |  |  | 16 |  |  | 46 |
Total defined benefit pension and post-retirement benefit plans | 62 |  |  | 16 |  |  | 46 |
Total other comprehensive income | $ | 18,423 |  |  | $ | 4,686 |  |  | $ | 13,737 |
Accumulated balances for each component of other comprehensive income, net of tax | The accumulated balances for each component of other comprehensive income, net of tax, were as follows as of the dates presented:
| March 31, 2021 |  | December 31, 2020
Unrealized gains on securities | $ | 14,972 |  |  | $ | 42,246 |
Non-credit related portion of previously recorded other-than-temporary impairment on securities | — |  |  | (11,319) |
Unrealized gains (losses) on derivative instruments | 10,346 |  |  | (638) |
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations | (5,179) |  |  | (5,221) |
Total accumulated other comprehensive income | $ | 20,139 |  |  | $ | 25,068 |

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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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