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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2016 and December 31, 2015 are summarized in the tables below:
 
March 31, 2016
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
(amounts in thousands)
 
 
 
 
 
 
 
Available for Sale:
 
 
 
 
 
 
 
Agency-guaranteed residential mortgage-backed securities
$
285,259

 
$
2,359

 
$
(1,329
)
 
$
286,289

Agency-guaranteed commercial real estate mortgage-backed securities
204,921

 
2,485

 
(9
)
 
207,397

Corporate notes (1)
44,927

 
303

 
(209
)
 
45,021

Equity securities (2)
22,514

 
—

 
(5,056
)
 
17,458

 
$
557,621

 
$
5,147

 
$
(6,603
)
 
$
556,165

(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 months ended March 31, 2016 and 2015:
 
Three Months Ended March 31,
 
2016
 
2015
(amounts in thousands)
 
 
 
Proceeds from sale of available-for-sale securities
$
2,848

 
$
—

Gross gains
$
26

 
—

Gross losses
—

 
—

Net gains
$
26

 
$
—
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:
 
March 31, 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
37,927

 
37,911

Due after ten years
7,000

 
7,110

Agency-guaranteed residential mortgage-backed securities
285,259

 
286,289

Agency-guaranteed commercial real estate mortgage-backed securities
204,921

 
207,397

Total debt securities
$
535,107

 
$
538,707
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 March 31, 2016 and December 31, 2015 were as follows:
 
March 31, 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
$
13,858

 
$
(23
)
 
$
56,604

 
$
(1,306
)
 
$
70,462

 
$
(1,329
)
Agency-guaranteed commercial real estate mortgage-backed securities
20,954

 
(9
)
 
—

 
—

 
20,954

 
(9
)
Corporate notes (1)
18,718

 
(209
)
 
—

 
—

 
18,718

 
(209
)
Equity securities (2)
17,452

 
(5,055
)
 
6

 
(1
)
 
17,458

 
(5,056
)
Total
$
70,982

 
$
(5,296
)
 
$
56,610

 
$
(1,307
)
 
$
127,592

 
$
(6,603
)
 
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.