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Investment Securities (Tables)
 6 Months Ended
Jun. 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 June 30, 2016 and December 31, 2015 are summarized in the tables below:
 
June 30, 2016
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
(amounts in thousands)
 
 
 
 
 
 
 
Available for Sale:
 
 
 
 
 
 
 
Agency-guaranteed residential mortgage-backed securities
$
269,044

 
$
3,484

 
$
(552
)
 
$
271,976

Agency-guaranteed commercial real estate mortgage-backed securities
204,845

 
8,709

 
—

 
213,554

Corporate notes (1)
44,929

 
861

 
(78
)
 
45,712

Equity securities (2)
22,514

 
—

 
(5,821
)
 
16,693

 
$
541,332

 
$
13,054

 
$
(6,451
)
 
$
547,935

(1)
Includes subordinated debt issued by other bank holding companies.
(2) Consists primarily 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 six months ended June 30, 2016 and 2015:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
(amounts in thousands)
 
 
 
 
 
 
 
Proceeds from sale of available-for-sale securities
$
—

 
$
492

 
$
2,848

 
$
492

Gross gains
$
—

 
—

 
$
26

 
$
—

Gross losses
—

 
(69
)
 
—

 
(69
)
Net gains
$
—

 
$
(69
)
 
$
26

 
$
(69
)
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:
 
June 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
37,929

 
38,427

Due after ten years
7,000

 
7,285

Agency-guaranteed residential mortgage-backed securities
269,044

 
271,976

Agency-guaranteed commercial real estate mortgage-backed securities
204,845

 
213,554

Total debt securities
$
518,818

 
$
531,242
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 June 30, 2016 and December 31, 2015 were as follows:
 
June 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
$
—

 
$
—

 
$
53,069

 
$
(552
)
 
$
53,069

 
$
(552
)
Corporate notes (1)
13,923

 
(78
)
 
—

 
—

 
13,923

 
(78
)
Equity securities (2)
—

 
—

 
16,693

 
(5,821
)
 
16,693

 
(5,821
)
Total
$
13,923

 
$
(78
)
 
$
69,762

 
$
(6,373
)
 
$
83,685

 
$
(6,451
)
 
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.