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Other Comprehensive Income/Loss | 6 Months Ended
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Jun. 30, 2019
Equity [Abstract] |
Other Comprehensive Income/Loss | Other Comprehensive Income/Loss 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, | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Investment securities available-for sale: |  |  |  |  |  |  |  |  |  |  |
Change in net unrealized gains during period | $ | 20.2 |  |  | $ | (3.9 | ) |  | $ | 5.1 |  |  | $ | (1.0 | ) |  | $ | 15.1 |  |  | $ | (2.9 | )
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity | — |  |  | 0.5 |  |  | — |  |  | 0.1 |  |  | — |  |  | 0.4 |
Defined benefits post-retirement benefit plan: |  |  |  |  |  |  |  |  |  |  |
Change in net actuarial (gain) loss | (0.2 | ) |  | (0.2 | ) |  | — |  |  | — |  |  | (0.2 | ) |  | (0.2 | )
Total other comprehensive income (loss) | $ | 20.0 |  |  | $ | (3.6 | ) |  | $ | 5.1 |  |  | $ | (0.9 | ) |  | $ | 14.9 |  |  | $ | (2.7 | )
| Pre-tax |  | Tax Expense (Benefit) |  | Net of Tax
Six Months Ended June 30, | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Investment securities available-for sale: |  |  |  |  |  |  |  |  |  |  |
Change in net unrealized gains during period | $ | 53.8 |  |  | $ | (27.6 | ) |  | $ | 14.0 |  |  | $ | (7.2 | ) |  | $ | 39.8 |  |  | $ | (20.4 | )
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale | (6.0 | ) |  | — |  |  | (1.6 | ) |  | — |  |  | (4.4 | ) |  | — |
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity | — |  |  | 1.0 |  |  | — |  |  | 0.3 |  |  | — |  |  | 0.7 |
Defined benefits post-retirement benefit plan: |  |  |  |  |  |  |  |  |  |  |
Change in net actuarial (gain) loss | (0.3 | ) |  | (0.3 | ) |  | — |  |  | (0.1 | ) |  | (0.3 | ) |  | (0.2 | )
Total other comprehensive income (loss) | $ | 47.5 |  |  | $ | (26.9 | ) |  | $ | 12.4 |  |  | $ | (7.0 | ) |  | $ | 35.1 |  |  | $ | (19.9 | )
The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
| June 30, 2019 |  | December 31, 2018
Net unrealized gain (loss) on investment securities available-for-sale | $ | 9.9 |  |  | $ | (25.5 | )
Net actuarial gain (loss) on defined benefit post-retirement benefit plans | 0.6 |  |  | 0.9 |
Net accumulated other comprehensive gain (loss) | $ | 10.5 |  |  | $ | (24.6 | )

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration