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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Schedule Of Investment Securities
Investment Securities (dollars in millions)
 
December 31, 2017
 
December 31, 2016
Available-for-sale securities
 

 
 

Debt securities
$
6,123.6

 
$
3,674.1

Equity securities
44.7

 
34.1

Held-to-maturity securities
   
 
   
Debt securities(1)
—

 
243.0

Securities carried at fair value with changes recorded in net income
   
 
   
Debt securities
0.4

 
283.5

Non-marketable investments(2)
301.2

 
256.4

Total investment securities
$
6,469.9

 
$
4,491.1

(1) Recorded at amortized cost.
(2) Non-marketable investments include securities of the FRB and FHLB carried at cost of $258.9 million at December 31, 2017 and $239.7 million at December 31, 2016. The remaining non-marketable investments include ownership interests greater than 3% in limited partnership investments that are accounted for under the equity method, other investments carried at cost, which include qualified Community Reinvestment Act (CRA) investments, equity fund holdings and shares issued by customers during loan work out situations or as part of an original loan investment, totaling $42.3 million and $16.7 million at December 31, 2017 and December 31, 2016, respectively.
Schedule Of Interest And Dividend Income
The following table presents interest and dividends on interest bearing deposits and investments:

Interest and Dividend Income (dollars in millions)
 
Years Ended December 31,
 
2017
 
2016
 
2015
Interest income — investments / reverse repos
$
128.9

 
$
82.1

 
$
43.7

Interest income — interest bearing deposits
57.7

 
33.1

 
17.1

Dividends — investments
10.9

 
16.7

 
10.4

Total interest and dividends
$
197.5

 
$
131.9

 
$
71.2
Amortized Cost And Fair Value Of Securities Available-For-Sale
The following table presents amortized cost and fair value of securities AFS and securities held-to-maturity ("HTM").

Amortized Cost and Fair Value (dollars in millions)

 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
December 31, 2017
 
 
 
 
 
 
 
Debt securities AFS
 

 
 

 
 

 
 

Mortgage-backed Securities
   
 
   
 
   
 
   
U.S. government agency securities
$
5,010.2

 
$
2.1

 
$
(62.1
)
 
$
4,950.2

Non-agency securities
297.3

 
21.7

 
(0.5
)
 
318.5

U.S. government agency obligations
25.0

 
—

 
(0.2
)
 
24.8

U.S. Treasury securities
297.7

 
0.2

 
(0.2
)
 
297.7

Supranational securities
449.8

 
—

 
(0.3
)
 
449.5

State & Municipal Bonds
16.2

 
—

 
(0.4
)
 
15.8

Corporate Bonds - Foreign
65.7

 
1.4

 
—

 
67.1

Total debt securities AFS
6,161.9

 
25.4

 
(63.7
)
 
6,123.6

Equity securities AFS
45.8

 
—

 
(1.1
)
 
44.7

Total securities AFS
$
6,207.7

 
$
25.4

 
$
(64.8
)
 
$
6,168.3

December 31, 2016
 

 
 

 
 

 
 

Debt securities AFS
   

 
   

 
   

 
   

Mortgage-backed Securities
 

 
 

 
 

 
 

U.S. government agency securities
$
2,073.6

 
$
1.6

 
$
(32.3
)
 
$
2,042.9

Non-agency securities
471.7

 
15.6

 
(1.8
)
 
485.5

U.S. government agency obligations
649.9

 
—

 
(3.9
)
 
646.0

U.S. Treasury securities
299.9

 
—

 
(0.4
)
 
299.5

Supranational securities
200.2

 
—

 
—

 
200.2

Total debt securities AFS
3,695.3

 
17.2

 
(38.4
)
 
3,674.1

Equity securities AFS
35.0

 
—

 
(0.9
)
 
34.1

Total securities AFS
3,730.3

 
17.2

 
(39.3
)
 
3,708.2

Debt Securities HTM
 
 
 
 
 
 
 
Mortgage-backed securities
 
 
 
 
 
 
 
U.S. government agency securities
110.0

 
0.7

 
(3.3
)
 
107.4

State and municipal
27.7

 
—

 
(0.5
)
 
27.2

Foreign government
2.4

 
—

 
—

 
2.4

Corporate — foreign
102.9

 
6.2

 
—

 
109.1

Total debt securities HTM
243.0

 
6.9

 
(3.8
)
 
246.1

Total
$
3,973.3

 
$
24.1

 
$
(43.1
)
 
$
3,954.3
Amortized Cost And Fair Value Of Securities Held-To-Maturity
The following table presents amortized cost and fair value of securities AFS and securities held-to-maturity ("HTM").

Amortized Cost and Fair Value (dollars in millions)

 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
December 31, 2017
 
 
 
 
 
 
 
Debt securities AFS
 

 
 

 
 

 
 

Mortgage-backed Securities
   
 
   
 
   
 
   
U.S. government agency securities
$
5,010.2

 
$
2.1

 
$
(62.1
)
 
$
4,950.2

Non-agency securities
297.3

 
21.7

 
(0.5
)
 
318.5

U.S. government agency obligations
25.0

 
—

 
(0.2
)
 
24.8

U.S. Treasury securities
297.7

 
0.2

 
(0.2
)
 
297.7

Supranational securities
449.8

 
—

 
(0.3
)
 
449.5

State & Municipal Bonds
16.2

 
—

 
(0.4
)
 
15.8

Corporate Bonds - Foreign
65.7

 
1.4

 
—

 
67.1

Total debt securities AFS
6,161.9

 
25.4

 
(63.7
)
 
6,123.6

Equity securities AFS
45.8

 
—

 
(1.1
)
 
44.7

Total securities AFS
$
6,207.7

 
$
25.4

 
$
(64.8
)
 
$
6,168.3

December 31, 2016
 

 
 

 
 

 
 

Debt securities AFS
   

 
   

 
   

 
   

Mortgage-backed Securities
 

 
 

 
 

 
 

U.S. government agency securities
$
2,073.6

 
$
1.6

 
$
(32.3
)
 
$
2,042.9

Non-agency securities
471.7

 
15.6

 
(1.8
)
 
485.5

U.S. government agency obligations
649.9

 
—

 
(3.9
)
 
646.0

U.S. Treasury securities
299.9

 
—

 
(0.4
)
 
299.5

Supranational securities
200.2

 
—

 
—

 
200.2

Total debt securities AFS
3,695.3

 
17.2

 
(38.4
)
 
3,674.1

Equity securities AFS
35.0

 
—

 
(0.9
)
 
34.1

Total securities AFS
3,730.3

 
17.2

 
(39.3
)
 
3,708.2

Debt Securities HTM
 
 
 
 
 
 
 
Mortgage-backed securities
 
 
 
 
 
 
 
U.S. government agency securities
110.0

 
0.7

 
(3.3
)
 
107.4

State and municipal
27.7

 
—

 
(0.5
)
 
27.2

Foreign government
2.4

 
—

 
—

 
2.4

Corporate — foreign
102.9

 
6.2

 
—

 
109.1

Total debt securities HTM
243.0

 
6.9

 
(3.8
)
 
246.1

Total
$
3,973.3

 
$
24.1

 
$
(43.1
)
 
$
3,954.3
Amortized Cost And Fair Value Of Debt Securities By Contractual Maturity Dates
The following table presents the debt securities AFS by contractual maturity dates:

Maturities (dollars in millions)
 
December 31, 2017
 
Amortized
Cost
 
Fair
Value
 
Weighted
Average
Yields
Mortgage-backed securities - U.S. government agency securities
 

 
 

 
 

After 5 but within 10 years
$
198.7

 
$
196.9

 
2.05
%
Due after 10 years
4,811.5

 
4,753.3

 
2.50
%
Total
5,010.2

 
4,950.2

 
2.48
%
Mortgage-backed securities - non agency securities
 

 
 

 
 

After 1 but within 5 years
12.5

 
12.5

 
5.16
%
After 5 but within 10 years
6.9

 
7.4

 
4.56
%
Due after 10 years
277.9

 
298.6

 
5.72
%
Total
297.3

 
318.5

 
5.67
%
U.S. government agency obligations
 

 
 

 
 

After 1 but within 5 years
25.0

 
24.8

 
2.14
%
Total
25.0

 
24.8

 
2.14
%
U.S. Treasury Securities
   
 
   
 
   
Due within 1 year
199.3

 
199.1

 
1.19
%
After 5 but within 10 years
98.4

 
98.6

 
2.44
%
Total
297.7

 
297.7

 
1.60
%
Supranational securities
   
 
   
 
   
   Due within 1 year
399.8

 
399.8

 
1.19
%
   After 1 but within 5 years
50.0

 
49.7

 
2.02
%
Total
449.8

 
449.5

 
1.28
%
State and Municipal Bonds
 
 
 
 
 
   Due within 1 year
0.1

 
0.1

 
2.36
%
   After 1 but within 5 years
0.1

 
0.1

 
2.56
%
   After 5 but within 10 years
0.3

 
0.3

 
2.70
%
   Due after 10 years
15.7

 
15.3

 
2.35
%
Total
16.2

 
15.8

 
2.36
%
Corporate Bonds - Foreign
 
 
 
 
 
After 1 but within 5 years
65.7

 
67.1

 
6.12
%
Total
65.7

 
67.1

 
6.12
%
Total debt securities available-for-sale
$
6,161.9

 
$
6,123.6

 
2.54
%
Schedule Of Securities - Estimated Unrealized Losses
The following table summarizes the gross unrealized losses and estimated fair value of AFS securities and HTM securities aggregated by investment category and length of time that the securities have been in a continuous unrealized loss position.

Gross Unrealized Losses (dollars in millions)
 
December 31, 2017
 
Less than 12 months
 
12 months or greater
 
Fair
Value
 
Gross
Unrealized
Loss
 
Fair
Value
 
Gross
Unrealized
Loss
Debt securities AFS
 

 
 

 
 

 
 

Mortgage-backed securities
   
 
   
 
   
 
   
U.S. government agency securities
$
3,492.2

 
$
(30.9
)
 
$
1,151.4

 
$
(31.2
)
Non-agency securities
2.1

 
—

 
0.4

 
(0.5
)
U.S. government agency obligations
24.8

 
(0.2
)
 
—

 
—

U.S. Treasury Securities
199.1

 
(0.2
)
 
—

 
—

State and Municipal Bonds
—

 
—

 
13.6

 
(0.4
)
Supranational securities
349.5

 
(0.3
)
 
—

 
—

Total debt securities AFS
4,067.7

 
(31.6
)
 
1,165.4

 
(32.1
)
Equity securities AFS
0.1

 
(0.2
)
 
44.5

 
(0.9
)
Total securities available-for-sale
$
4,067.8

 
$
(31.8
)
 
$
1,209.9

 
$
(33.0
)

 
December 31, 2016
 
Less than 12 months
 
12 months or greater
 
Fair
Value
 
Gross
Unrealized
Loss
 
Fair
Value
 
Gross
Unrealized
Loss
Debt securities AFS
 

 
 

 
 

 
 

Mortgage-backed securities
   
 
   
 
   
 
   
U.S. government agency securities
$
1,589.6

 
$
(31.8
)
 
$
13.8

 
$
(0.5
)
Non-agency securities
56.5

 
(1.4
)
 
15.8

 
(0.4
)
U.S. government agency obligations
546.1

 
(3.9
)
 
—

 
—

U.S. Treasury Securities
299.5

 
(0.4
)
 
—

 
—

Total debt securities AFS
2,491.7

 
(37.5
)
 
29.6

 
(0.9
)
Equity securities AFS
34.1

 
(0.9
)
 
—

 
—

Total securities available-for-sale
2,525.8

 
(38.4
)
 
29.6

 
(0.9
)
Debt securities HTM
 
 
 
 
 
 
 
Mortgage-backed securities
 
 
 
 
 
 
 
U.S. government agency securities
68.2

 
(1.7
)
 
26.7

 
(1.6
)
State and municipal
3.8

 
(0.1
)
 
22.4

 
(0.4
)
Total securities held-to-maturity
72.0

 
(1.8
)
 
49.1

 
(2.0
)
Total
$
2,597.8

 
$
(40.2
)
 
$
78.7

 
$
(2.9
)
Changes In Accretable Yield For Purchased Credit-Impaired Securities

Changes in Accretable Yield for PCI Securities (dollars in millions)
 
Years Ended December 31,
 
2017
 
2016
 
2015
Beginning Balance(1)
$
165.0

 
$
189.0

 
$
204.4

Accretion into interest income
(23.4
)
 
(29.2
)
 
(13.5
)
Reclassifications from non-accretable difference due to increasing cash flows
2.4

 
4.7

 
—

Reclassifications to non-accretable difference due to decreasing cash flows
(2.2
)
 
0.5

 
(1.7
)
Disposals
(40.1
)
 
—

 
(0.2
)
Balance at year end
$
101.7

 
$
165.0

 
$
189.0

(1)  For year ended December 31, 2015, the beginning balance is as of August 3, 2015, the acquisition date of OneWest Bank.