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Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Schedule of Comprehensive Income (Loss) | The gross amounts of each component of other comprehensive income and the related tax effects for the periods indicated are as follows:
Year ended December 31, 2017 | Before Tax Amount | Tax Expense (Benefit) | Net of Tax Amount
Investment securities available-for sale: |  |  |
Change in net unrealized loss during period | $ | (6.5 | ) | $ | (2.7 | ) | $ | (3.8 | )
Reclassification adjustment for net gains included in net income | (0.7 | ) | (0.3 | ) | (0.4 | )
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity | 1.8 |  | 0.7 |  | 1.1 |
Change in net unrealized loss on derivatives | (1.1 | ) | (0.4 | ) | (0.7 | )
Reclassification adjustment for derivative net (gains) losses included in net income | 1.1 |  | 0.4 |  | 0.7 |
Defined benefits post-retirement benefit plan: |  |  |
Change in net actuarial loss (gain) | (1.2 | ) | (0.5 | ) | (0.7 | )
Total other comprehensive loss | $ | (6.6 | ) | $ | (2.8 | ) | $ | (3.8 | )
Year ended December 31, 2016 | Before Tax Amount | Tax Expense (Benefit) | Net of Tax Amount
Investment securities available-for sale: |  |  |
Change in net unrealized loss during period | $ | (19.4 | ) | $ | (7.6 | ) | $ | (11.8 | )
Reclassification adjustment for net gains included in net income | (0.3 | ) | (0.1 | ) | (0.2 | )
Unamortized premium on available-to-sale securities transferred into held-for-maturity | 1.9 |  | 0.7 |  | 1.2 |
Change in net unrealized gain on derivatives | (0.2 | ) | (0.1 | ) | (0.1 | )
Defined benefits post-retirement benefit plan: |  |  |
Change in net actuarial loss | 4.0 |  | 1.6 |  | 2.4 |
Total other comprehensive loss | $ | (14.0 | ) | $ | (5.5 | ) | $ | (8.5 | )
Year ended December 31, 2015 | Before Tax Amount | Tax Expense (Benefit) | Net of Tax Amount
Investment securities available-for sale: |  |  |
Change in net unrealized loss during period | $ | 3.1 |  | $ | 1.2 |  | $ | 1.9 |
Reclassification adjustment for net gains included in net income | (0.2 | ) | (0.1 | ) | (0.1 | )
Change in unamortized gain on available-for-sale securities transferred into held-to-maturity | 1.6 |  | 0.6 |  | 1.0 |
Change in net unrealized gain on derivatives | 0.2 |  | 0.1 |  | 0.1 |
Defined benefits post-retirement benefit plan: |  |  |
Change in net actuarial loss | 0.1 |  | 0.1 |  | — |
Total other comprehensive income | $ | 4.8 |  | $ | 1.9 |  | $ | 2.9 |
Schedule of Accumulated Other Comprehensive Income (Loss) | The components of accumulated other comprehensive income (loss), net of income taxes, are as follows:
Year ended December 31, | 2017 |  | 2016
Net unrealized gain (loss) on investment securities available-for-sale | $ | (13.2 | ) |  | $ | (10.1 | )
Net actuarial gain (loss) on defined benefit post-retirement benefit plans | 1.3 |  |  | 2.0 |
Net unrealized gain (loss) on derivatives | — |  |  | — |
Net accumulated other comprehensive income (loss) | $ | (11.9 | ) |  | $ | (8.1 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e526-108580 + Details
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