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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 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 |
Corporate securities | 61.6 |  | 0.1 |  | (0.3 | ) | 61.4 |
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 |
Other investments | 0.2 |  | — |  | — |  | 0.2 |
Total | $ | 484.5 |  | $ | 11.5 |  | $ | (12.7 | ) | $ | 483.3 |
December 31, 2016 | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value
Available-for-Sale |  |  |  |
U.S. Treasury notes | $ | 3.6 |  | $ | — |  | $ | — |  | $ | 3.6 |
Obligations of U.S. government agencies | 397.4 |  | 0.3 |  | (6.4 | ) | 391.3 |
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | 1,220.9 |  | 6.4 |  | (13.6 | ) | 1,213.7 |
Private mortgage-backed securities | 0.1 |  | — |  | — |  | 0.1 |
Other investments | 3.0 |  | — |  | — |  | 3.0 |
Total | $ | 1,625.0 |  | $ | 6.7 |  | $ | (20.0 | ) | $ | 1,611.7 |
December 31, 2016 | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value
Held-to Maturity |  |  |  |
State, county and municipal securities | $ | 160.2 |  | $ | 2.7 |  | $ | (0.5 | ) | $ | 162.4 |
Corporate securities | 53.0 |  | 0.2 |  | (0.2 | ) | 53.0 |
Obligations of U.S. government agencies | 19.8 |  | — |  | (0.2 | ) | 19.6 |
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | 279.6 |  | 7.8 |  | (9.2 | ) | 278.2 |
Other investments | 0.2 |  | — |  | — |  | 0.2 |
Total | $ | 512.8 |  | $ | 10.7 |  | $ | (10.1 | ) | $ | 513.4 |
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, 2017 and 2016.
| 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 | )
Corporate securities | 41.2 |  | (0.2 | ) | 5.0 |  | (0.1 | ) | 46.2 |  | (0.3 | )
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | 76.4 |  | (9.1 | ) | 60.5 |  | (2.5 | ) | 136.9 |  | (11.6 | )
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 | )
| Less than 12 Months | 12 Months or More | Total
December 31, 2016 | Fair Value | Gross Unrealized Losses | Fair Value | Gross Unrealized Losses | Fair Value | Gross Unrealized Losses
Available-for-Sale |  |  |  |  |  |
U.S. Treasury notes | $ | 0.6 |  | $ | — |  | $ | — |  | $ | — |  | $ | 0.6 |  | $ | — |
Obligations of U.S. government agencies | 316.5 |  | (6.4 | ) | — |  | — |  | 316.5 |  | (6.4 | )
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | 746.3 |  | (13.1 | ) | 15.8 |  | (0.5 | ) | 762.1 |  | (13.6 | )
Total | $ | 1,063.4 |  | $ | (19.5 | ) | $ | 15.8 |  | $ | (0.5 | ) | $ | 1,079.2 |  | $ | (20.0 | )
| Less than 12 Months | 12 Months or More | Total
December 31, 2016 | Fair Value | Gross Unrealized Losses | Fair Value | Gross Unrealized Losses | Fair Value | Gross Unrealized Losses
Held-to-Maturity |  |  |  |  |  |
State, county and municipal securities | $ | 42.5 |  | $ | (0.5 | ) | $ | 2.8 |  | $ | — |  | $ | 45.3 |  | $ | (0.5 | )
Corporate securities | 32.5 |  | (0.2 | ) | — |  | — |  | $ | 32.5 |  | $ | (0.2 | )
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | $ | 108.8 |  | $ | (7.9 | ) | $ | 20.0 |  | $ | (1.3 | ) | $ | 128.8 |  | $ | (9.2 | )
Obligations of U.S. government agencies | $ | 19.6 |  | $ | (0.2 | ) | $ | — |  | $ | — |  | $ | 19.6 |  | $ | (0.2 | )
Total | $ | 203.4 |  | $ | (8.8 | ) | $ | 22.8 |  | $ | (1.3 | ) | $ | 226.2 |  | $ | (10.1 | )
Maturities of Investment Securities | All other investment securities maturities are shown at contractual maturity dates.
| Available-for-Sale |  | Held-to-Maturity
December 31, 2017 | Amortized Cost | Estimated Fair Value |  | Amortized Cost | Estimated Fair Value
Within one year | $ | 450.7 |  | $ | 447.5 |  |  | $ | 76.1 |  | $ | 76.7 |
After one year but within five years | 1,422.7 |  | 1,409.3 |  |  | 266.2 |  | 263.1 |
After five years but within ten years | 277.6 |  | 274.2 |  |  | 111.7 |  | 113.3 |
After ten years | 78.3 |  | 77.7 |  |  | 30.5 |  | 30.2 |
Total | $ | 2,229.3 |  | $ | 2,208.7 |  |  | $ | 484.5 |  | $ | 483.3 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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://www.xbrl.org/2003/role/presentationRef -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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