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Other Comprehensive Income/Loss (Tables) | 6 Months Ended
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Jun. 30, 2020
Equity [Abstract] |
Schedule of Other Comprehensive Income and Related Tax Effects | The gross amounts of each component of other comprehensive income and the related tax effects are as follows:
| Pre-tax |  | Tax Expense (Benefit) |  | Net of Tax
Three Months Ended June 30, | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
Investment securities available-for sale: |  |  |  |  |  |  |  |  |  |  |
Change in net unrealized gains during period | $ | 34.9 |  |  | $ | 20.2 |  |  | $ | 9.5 |  |  | $ | 5.1 |  |  | $ | 25.4 |  |  | $ | 15.1 |
Unrealized loss on derivatives | 0.2 |  |  | — |  |  | — |  |  | — |  |  | 0.2 |  |  | — |
Defined benefits post-retirement benefit plan: |  |  |  |  |  |  |  |  |  |  |
Change in net actuarial gains | (0.2 | ) |  | (0.2 | ) |  | — |  |  | — |  |  | (0.2 | ) |  | (0.2 | )
Total other comprehensive income | $ | 34.9 |  |  | $ | 20.0 |  |  | $ | 9.5 |  |  | $ | 5.1 |  |  | $ | 25.4 |  |  | $ | 14.9 |
| Pre-tax |  | Tax Expense (Benefit) |  | Net of Tax
Six Months Ended June 30, | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
Investment securities available-for sale: |  |  |  |  |  |  |  |  |  |  |
Change in net unrealized gains during period | $ | 74.1 |  |  | $ | 53.8 |  |  | $ | 19.8 |  |  | $ | 14.0 |  |  | $ | 54.3 |  |  | $ | 39.8 |
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale | — |  |  | (6.0 | ) |  | — |  |  | (1.6 | ) |  | — |  |  | (4.4 | )
Unrealized loss on derivatives | 0.2 |  |  | — |  |  | — |  |  | — |  |  | 0.2 |  |  | — |
Defined benefits post-retirement benefit plan: |  |  |  |  |  |  |  |  |  |  |
Change in net actuarial gains | (0.4 | ) |  | (0.3 | ) |  | (0.1 | ) |  | — |  |  | (0.3 | ) |  | (0.3 | )
Total other comprehensive income | $ | 73.9 |  |  | $ | 47.5 |  |  | $ | 19.7 |  |  | $ | 12.4 |  |  | $ | 54.2 |  |  | $ | 35.1 |
Schedule of Accumulated Other Comprehensive Income (Loss) | The components of accumulated other comprehensive income, net of related tax effects, are as follows:
| June 30, 2020 |  | December 31, 2019
Net unrealized gains on investment securities available-for-sale | $ | 65.3 |  |  | $ | 10.6 |
Net unrealized loss on derivatives | (0.2 | ) |  | — |
Net actuarial gains on defined benefit post-retirement benefit plans | 0.1 |  |  | 0.4 |
Net accumulated other comprehensive gains | $ | 65.2 |  |  | $ | 11.0 |

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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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