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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Cost and Approximate Fair Value of Investment Securities
The amortized cost and approximate fair value of investment securities as of September 30, 2016 and December 31, 2015 are summarized in the tables below:
 
September 30, 2016
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
(amounts in thousands)
 
 
 
 
 
 
 
Available for Sale:
 
 
 
 
 
 
 
Agency-guaranteed residential mortgage-backed securities
$
251,755

 
$
2,890

 
$
(325
)
 
$
254,320

Agency-guaranteed commercial real estate mortgage-backed securities
204,769

 
9,030

 
—

 
213,799

Corporate notes (1)
44,930

 
1,111

 
—

 
46,041

Equity securities (2)
22,508

 
—

 
(5,772
)
 
16,736

 
$
523,962

 
$
13,031

 
$
(6,097
)
 
$
530,896

(1)
Includes subordinated debt issued by other bank holding companies.
(2) Consists of equity securities issued by a foreign entity.

 
December 31, 2015
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
(amounts in thousands)
 
 
 
 
 
 
 
Available for Sale:
 
 
 
 
 
 
 
Agency-guaranteed residential mortgage-backed securities
$
299,392

 
$
1,453

 
$
(2,741
)
 
$
298,104

Agency-guaranteed commercial real estate mortgage-backed securities
206,719

 
—

 
(3,849
)
 
202,870

Corporate notes (1)
39,925

 
320

 
(178
)
 
40,067

Equity securities (2)
22,514

 
—

 
(3,302
)
 
19,212

 
$
568,550

 
$
1,773

 
$
(10,070
)
 
$
560,253

(1)
Includes subordinated debt issued by other bank holding companies.
(2) Consists primarily of equity securities issued by a foreign entity.
Statement of Proceeds from Sale of Available for Sale Investment Securities
The following table presents proceeds from the sale of available-for-sale investment securities and gross gains and gross losses realized on those sales for the three and nine months ended September 30, 2016 and 2015:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
(amounts in thousands)
 
 
 
 
 
 
 
Proceeds from sale of available-for-sale securities
$
5

 
$
314

 
$
2,853

 
$
806

Gross gains
$
—

 
$
—

 
$
26

 
$
—

Gross losses
(1
)
 
(16
)
 
(1
)
 
(85
)
Net gains (losses)
$
(1
)
 
$
(16
)
 
$
25

 
$
(85
)
Summary of Available-for-Sale Debt Securities by Stated Maturity
The following table presents available-for-sale debt securities by stated maturity.  Debt securities backed by mortgages have expected maturities that differ from contractual maturities because borrowers have the right to call or prepay and, therefore, these debt securities are classified separately with no specific maturity date:
 
September 30, 2016
 
Amortized
Cost
 
Fair
Value
(amounts in thousands)
 
 
 
Due in one year or less
$
—

 
$
—

Due after one year through five years
—

 
—

Due after five years through ten years
37,930

 
38,783

Due after ten years
7,000

 
7,258

Agency-guaranteed residential mortgage-backed securities
251,755

 
254,320

Agency-guaranteed commercial real estate mortgage-backed securities
204,769

 
213,799

Total debt securities
$
501,454

 
$
514,160
Gross Unrealized Losses and Fair Value, Aggregated by Investment Category
Gross unrealized losses and fair value of Customers' investments aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at September 30, 2016 and December 31, 2015 were as follows:
 
September 30, 2016
 
Less Than 12 Months
 
12 Months or More
 
Total
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
(amounts in thousands)
 
 
 
 
 
 
 
 
 
 
 
Available for Sale:
 
 
 
 
 
 
 
 
 
 
 
Agency-guaranteed residential mortgage-backed securities
$
2,388

 
$
(1
)
 
$
32,529

 
$
(324
)
 
$
34,917

 
$
(325
)
Equity securities (2)
—

 
—

 
16,736

 
(5,772
)
 
16,736

 
(5,772
)
Total
$
2,388

 
$
(1
)
 
$
49,265

 
$
(6,096
)
 
$
51,653

 
$
(6,097
)
 
December 31, 2015
 
Less Than 12 Months
 
12 Months or More
 
Total
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
(amounts in thousands)
 
 
 
 
 
 
 
 
 
 
 
Available for Sale:
 
 
 
 
 
 
 
 
 
 
 
Agency-guaranteed residential mortgage-backed securities
$
102,832

 
$
(535
)
 
$
57,357

 
$
(2,206
)
 
160,189

 
$
(2,741
)
Agency-guaranteed commercial real estate mortgage-backed securities
202,870

 
(3,849
)
 
—

 
—

 
202,870

 
(3,849
)
Corporate notes (1)
9,748

 
(178
)
 
—

 
—

 
9,748

 
(178
)
Equity securities (2)
19,206

 
(3,301
)
 
6

 
(1
)
 
19,212

 
(3,302
)
Total
$
334,656

 
$
(7,863
)
 
$
57,363

 
$
(2,207
)
 
$
392,019

 
$
(10,070
)
(1)
Includes subordinated debt issued by other bank holding companies.    
(2) Consists primarily of equity securities in a foreign entity.