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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Amortized Cost and Approximate Fair Values of Investment Securities | The amortized cost and approximate fair values of investment securities are summarized as follows:
December 31, 2018 | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value
Available-for-Sale |  |  |  |
U.S. Treasury notes | $ | 2.6 |  | $ | — |  | $ | — |  | $ | 2.6 |
Obligations of U.S. government agencies | 569.3 |  | 0.1 |  | (10.2 | ) | 559.2 |
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | 1,566.4 |  | 2.5 |  | (24.1 | ) | 1,544.8 |
Private mortgage-backed securities | 72.0 |  | — |  | (1.8 | ) | 70.2 |
Corporate Securities | 92.9 |  | — |  | (1.0 | ) | 91.9 |
Other investments | 2.0 |  | — |  | — |  | 2.0 |
Total | $ | 2,305.2 |  | $ | 2.6 |  | $ | (37.1 | ) | $ | 2,270.7 |
December 31, 2018 | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value
Held-to Maturity |  |  |  |
State, county and municipal securities | $ | 150.9 |  | $ | 1.8 |  | $ | (0.9 | ) | $ | 151.8 |
U.S agency residential mortgage-backed securities & collateralized mortgage obligations | 189.7 |  | 0.3 |  | (6.5 | ) | 183.5 |
Corporate securities | 46.3 |  | 0.1 |  | (0.6 | ) | 45.8 |
Obligations of U.S. government agencies | 19.8 |  | — |  | (0.3 | ) | 19.5 |
Other investments | 0.1 |  | — |  | — |  | 0.1 |
Total | $ | 406.8 |  | $ | 2.2 |  | $ | (8.3 | ) | $ | 400.7 |
December 31, 2017 | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value
Available-for-Sale |  |  |  |
U.S. Treasury notes | $ | 3.2 |  | $ | — |  | $ | — |  | $ | 3.2 |
Obligations of U.S. government agencies | 569.5 |  | — |  | (8.0 | ) | 561.5 |
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | 1,474.1 |  | 3.8 |  | (15.4 | ) | 1,462.5 |
Private mortgage-backed securities | 91.5 |  | — |  | (0.8 | ) | 90.7 |
Corporate Securities | 88.0 |  | 0.1 |  | (0.3 | ) | 87.8 |
Other investments | 3.0 |  | — |  | — |  | 3.0 |
Total | $ | 2,229.3 |  | $ | 3.9 |  | $ | (24.5 | ) | $ | 2,208.7 |
December 31, 2017 | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value
Held-to Maturity |  |  |  |
State, county and municipal securities | $ | 172.4 |  | $ | 2.6 |  | $ | (0.6 | ) | $ | 174.4 |
Obligations of U.S. government agencies | 19.8 |  | — |  | (0.2 | ) | 19.6 |
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | 230.5 |  | 8.8 |  | (11.6 | ) | 227.7 |
Corporate securities | 61.6 |  | 0.1 |  | (0.3 | ) | 61.4 |
Other investments | 0.2 |  | — |  | — |  | 0.2 |
Total | $ | 484.5 |  | $ | 11.5 |  | $ | (12.7 | ) | $ | 483.3 |
Gross Unrealized Losses and Fair Values of Investment Securities | The following tables show the gross unrealized losses and fair values of investment securities, aggregated by investment category, and the length of time individual investment securities have been in a continuous unrealized loss position, as of December 31, 2018 and 2017.
| Less than 12 Months | 12 Months or More | Total
December 31, 2018 | Fair Value | Gross Unrealized Losses | Fair Value | Gross Unrealized Losses | Fair Value | Gross Unrealized Losses
Available-for-Sale |  |  |  |  |  |
Obligations of U.S. government agencies | $ | 363.1 |  | $ | (7.9 | ) | $ | 154.5 |  | $ | (2.3 | ) | $ | 517.6 |  | $ | (10.2 | )
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | 735.2 |  | (14.5 | ) | 503.7 |  | (9.6 | ) | 1,238.9 |  | (24.1 | )
Private mortgage-backed securities | — |  | — |  | 69.4 |  | (1.8 | ) | 69.4 |  | (1.8 | )
Corporate securities | 24.9 |  | (0.2 | ) | 51.4 |  | (0.8 | ) | 76.3 |  | (1.0 | )
Total | $ | 1,123.2 |  | $ | (22.6 | ) | $ | 779.0 |  | $ | (14.5 | ) | $ | 1,902.2 |  | $ | (37.1 | )
| Less than 12 Months | 12 Months or More | Total
December 31, 2018 | Fair Value | Gross Unrealized Losses | Fair Value | Gross Unrealized Losses | Fair Value | Gross Unrealized Losses
Held-to-Maturity |  |  |  |  |  |
State, county and municipal securities | $ | 25.9 |  | $ | (0.3 | ) | $ | 57.1 |  | $ | (0.6 | ) | $ | 83.0 |  | $ | (0.9 | )
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | 45.0 |  | (2.2 | ) | 120.2 |  | (4.3 | ) | 165.2 |  | (6.5 | )
Corporate securities | — |  | — |  | 39.6 |  | (0.6 | ) | 39.6 |  | (0.6 | )
Obligations of U.S. government agencies | 19.5 |  | (0.3 | ) | — |  | — |  | 19.5 |  | (0.3 | )
Total | $ | 90.4 |  | $ | (2.8 | ) | $ | 216.9 |  | $ | (5.5 | ) | $ | 307.3 |  | $ | (8.3 | )
| Less than 12 Months | 12 Months or More | Total
December 31, 2017 | Fair Value | Gross Unrealized Losses | Fair Value | Gross Unrealized Losses | Fair Value | Gross Unrealized Losses
Available-for-Sale |  |  |  |  |  |
Obligations of U.S. government agencies | 284.9 |  | (3.4 | ) | 266.1 |  | (4.6 | ) | 551.0 |  | (8.0 | )
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | 670.1 |  | (6.2 | ) | 439.2 |  | (9.2 | ) | 1,109.3 |  | (15.4 | )
Private mortgage-backed securities | 74.0 |  | (0.8 | ) | — |  | — |  | 74.0 |  | (0.8 | )
Corporate securities | 51.3 |  | (0.3 | ) | — |  | — |  | 51.3 |  | (0.3 | )
Total | $ | 1,080.3 |  | $ | (10.7 | ) | $ | 705.3 |  | $ | (13.8 | ) | $ | 1,785.6 |  | $ | (24.5 | )
| Less than 12 Months | 12 Months or More | Total
December 31, 2017 | Fair Value | Gross Unrealized Losses | Fair Value | Gross Unrealized Losses | Fair Value | Gross Unrealized Losses
Held-to-Maturity |  |  |  |  |  |
State, county and municipal securities | $ | 53.3 |  | $ | (0.4 | ) | $ | 12.3 |  | $ | (0.2 | ) | $ | 65.6 |  | $ | (0.6 | )
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | 76.4 |  | (9.1 | ) | 60.5 |  | (2.5 | ) | $ | 136.9 |  | $ | (11.6 | )
Corporate securities | $ | 41.2 |  | $ | (0.2 | ) | $ | 5.0 |  | $ | (0.1 | ) | $ | 46.2 |  | $ | (0.3 | )
Obligations of U.S. government agencies | $ | 9.7 |  | $ | — |  | $ | 9.9 |  | $ | (0.2 | ) | $ | 19.6 |  | $ | (0.2 | )
Total | $ | 180.6 |  | $ | (9.7 | ) | $ | 87.7 |  | $ | (3.0 | ) | $ | 268.3 |  | $ | (12.7 | )
Maturities of Investment Securities | All other investment securities maturities are shown at contractual maturity dates.
| Available-for-Sale |  | Held-to-Maturity
December 31, 2018 | Amortized Cost | Estimated Fair Value |  | Amortized Cost | Estimated Fair Value
Within one year | $ | 477.8 |  | $ | 472.3 |  |  | $ | 64.1 |  | $ | 63.0 |
After one year but within five years | 1,519.2 |  | 1,495.0 |  |  | 221.6 |  | 216.7 |
After five years but within ten years | 154.5 |  | 151.9 |  |  | 94.4 |  | 94.9 |
After ten years | 153.7 |  | 151.5 |  |  | 26.7 |  | 26.1 |
Total | $ | 2,305.2 |  | $ | 2,270.7 |  |  | $ | 406.8 |  | $ | 400.7 |

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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