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Investment Securities | 6 Months Ended
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Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Investment Securities | Investment Securities The amortized cost and approximate fair values of investment securities are summarized as follows:
June 30, 2018 | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value
Available-for-Sale: |  |  |  |
U.S. Treasury notes | $ | 1.9 |  | $ | — |  | $ | — |  | $ | 1.9 |
Obligations of U.S. government agencies | 557.0 |  | — |  | (13.8 | ) | 543.2 |
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | 1,491.7 |  | 1.6 |  | (33.4 | ) | 1,459.9 |
Private mortgage-backed securities | 80.1 |  | — |  | (1.7 | ) | 78.4 |
Corporate securities | 93.0 |  | 0.1 |  | (1.0 | ) | 92.1 |
Other investments | 2.5 |  | — |  | — |  | 2.5 |
Total | $ | 2,226.2 |  | $ | 1.7 |  | $ | (49.9 | ) | $ | 2,178.0 |
June 30, 2018 | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value
Held-to-Maturity: |  |  |  |
State, county and municipal securities | $ | 162.1 |  | $ | 1.6 |  | $ | (1.3 | ) | $ | 162.4 |
Obligations of U.S. government agencies | 19.7 |  | — |  | (0.3 | ) | 19.4 |
U.S agency residential mortgage-backed securities & collateralized mortgage obligations | 207.6 |  | 7.7 |  | (15.2 | ) | 200.1 |
Corporate securities | 51.4 |  | 0.1 |  | (0.7 | ) | 50.8 |
Other investments | 0.1 |  | — |  | — |  | 0.1 |
Total | $ | 440.9 |  | $ | 9.4 |  | $ | (17.5 | ) | $ | 432.8 |
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 |
There were no material gross realized gains and losses from the disposition of available-for-sale investment securities for the three and six months ended June 30, 2018 and 2017. 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 June 30, 2018 and December 31, 2017:
| Less than 12 Months |  | 12 Months or More |  | Total
June 30, 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 | $ | 266.1 |  | $ | (6.5 | ) |  | $ | 272.1 |  | $ | (7.3 | ) |  | $ | 538.2 |  | $ | (13.8 | )
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | 905.5 |  | (17.8 | ) |  | 415.7 |  | (15.6 | ) |  | 1,321.2 |  | (33.4 | )
Private mortgage-backed securities | 54.0 |  | (1.1 | ) |  | 24.4 |  | (0.6 | ) |  | 78.4 |  | (1.7 | )
Corporate securities | 40.6 |  | (1.0 | ) |  | — |  | — |  |  | 40.6 |  | (1.0 | )
Total | $ | 1,266.2 |  | $ | (26.4 | ) |  | $ | 712.2 |  | $ | (23.5 | ) |  | $ | 1,978.4 |  | $ | (49.9 | )
| Less than 12 Months |  | 12 Months or More |  | Total
June 30, 2018 | Fair Value | Gross Unrealized Losses |  | Fair Value | Gross Unrealized Losses |  | Fair Value | Gross Unrealized Losses
Held-to-Maturity: |  |  |  |  |  |  |  |
State, county and municipal securities | $ | 64.1 |  | $ | (0.9 | ) |  | $ | 17.3 |  | $ | (0.4 | ) |  | $ | 81.4 |  | $ | (1.3 | )
Obligations of U.S. government agencies | 9.6 |  | (0.1 | ) |  | 9.8 |  | (0.2 | ) |  | 19.4 |  | (0.3 | )
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | 86.1 |  | (11.8 | ) |  | 44.8 |  | (3.4 | ) |  | 130.9 |  | (15.2 | )
Corporate securities | 34.8 |  | (0.6 | ) |  | 4.9 |  | (0.1 | ) |  | 39.7 |  | (0.7 | )
Total | $ | 194.6 |  | $ | (13.4 | ) |  | $ | 76.8 |  | $ | (4.1 | ) |  | $ | 271.4 |  | $ | (17.5 | )
| 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
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 | )
Obligations of U.S. government agencies | 9.7 |  | — |  |  | 9.9 |  | (0.2 | ) |  | 19.6 |  | (0.2 | )
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 | )
Total | $ | 180.6 |  | $ | (9.7 | ) |  | $ | 87.7 |  | $ | (3.0 | ) |  | $ | 268.3 |  | $ | (12.7 | )
The investment portfolio is evaluated quarterly for other-than-temporary declines in the market value of each individual investment security. The Company had 701 and 581 individual investment securities that were in an unrealized loss position as of June 30, 2018 and December 31, 2017, respectively. As of June 30, 2018, the Company had the intent and ability to hold these investment securities for a period of time sufficient to allow for an anticipated recovery. Furthermore, the Company does not have the intent to sell any of the available-for-sale securities in the above table and it is more likely than not that the Company will not have to sell any securities before a recovery in cost. No impairment losses were recorded during the three and six months ended June 30, 2018 or 2017. Maturities of investment securities at June 30, 2018 are shown below. Maturities of mortgage-backed securities have been adjusted to reflect shorter maturities based upon estimated prepayments of principal. All other investment securities maturities are shown at contractual maturity dates.
| Available-for-Sale |  | Held-to-Maturity
June 30, 2018 | Amortized Cost | Estimated Fair Value |  | Amortized Cost | Estimated Fair Value
Within one year | $ | 458.8 |  | $ | 450.5 |  |  | $ | 76.3 |  | $ | 75.3 |
After one year but within five years | 1,490.2 |  | 1,457.5 |  |  | 221.4 |  | 215.7 |
After five years but within ten years | 218.2 |  | 212.2 |  |  | 110.7 |  | 110.5 |
After ten years | 59.0 |  | 57.8 |  |  | 32.5 |  | 31.3 |
Total | $ | 2,226.2 |  | $ | 2,178.0 |  |  | $ | 440.9 |  | $ | 432.8 |
As of June 30, 2018, the Company had investment securities callable within one year with amortized costs and estimated fair values of $107.2 million and $104.8 million, respectively. These investment securities are primarily included in the after one year but within five years category in the table above. As of June 30, 2018, the Company did not have any structured notes callable within one year.

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