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Investment Securities (Tables)
 12 Months Ended
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