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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2017
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 December 31, 2017 and 2016, are summarized as follows:
 
December 31, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
(amounts in thousands)
 
 
 
 
 
 
 
Available for Sale
 
 
 
 
 
 
 
Agency-guaranteed residential mortgage-backed securities
$
186,221

 
$
36

 
$
(2,799
)
 
$
183,458

Agency-guaranteed commercial real estate mortgage-backed securities
238,809

 
432

 
(769
)
 
238,472

Corporate notes (1)
44,959

 
1,130

 
—

 
46,089

Equity securities (2)
2,311

 
1,041

 
—

 
3,352

Total
$
472,300

 
$
2,639

 
$
(3,568
)
 
$
471,371

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

 
December 31, 2016
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
(amounts in thousands)
 
 
 
 
 
 
 
Available for Sale
 
 
 
 
 
 
 
Agency-guaranteed residential mortgage-backed securities
$
233,002

 
$
918

 
$
(2,657
)
 
$
231,263

Agency-guaranteed commercial real estate mortgage-backed securities
204,689

 
—

 
(2,872
)
 
201,817

Corporate notes (1)
44,932

 
401

 
(185
)
 
45,148

Equity securities (2)
15,246

 
—

 
—

 
15,246

Total
$
497,869

 
$
1,319

 
$
(5,714
)
 
$
493,474

 
(1)
Includes subordinated debt issued by other bank holding companies.
(2)
Includes equity securities issued by a foreign entity.
Statement of Proceeds from Sale of Available for Sale Investment Securities
The following table shows proceeds from the sale of available-for-sale investment securities, gross gains and gross losses on those sales of securities:
 
 
For the Years Ended December 31,
 
2017
 
2016
 
2015
(amounts in thousands)
 
 
 
 
 
Proceeds from sale of available-for-sale investment securities
$
769,203

 
$
2,852

 
$
806

Gross gains
$
8,808

 
$
26

 
$
—

Gross losses
(8
)
 
(1
)
 
(85
)
Net gains (losses)
$
8,800

 
$
25

 
$
(85
)
Summary of Investment Securities by Stated Maturity
The following table shows debt investment securities by stated maturity. Investment securities backed by mortgages have expected maturities that differ from contractual maturities because borrowers have the right to call or prepay and are, therefore, classified separately with no specific maturity date:

 
December 31, 2017
 
Available for Sale
 
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
42,959

 
44,005

Due after ten years
2,000

 
2,084

Agency-guaranteed residential mortgage-backed securities
186,221

 
183,458

Agency-guaranteed commercial mortgage-backed securities
238,809

 
238,472

Total debt securities
$
469,989

 
$
468,019
Gross Unrealized Losses and Fair Value, Aggregated by Investment Category
Gross unrealized losses and fair value of Customers' investment securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position were as follows:
 
 
December 31, 2017
 
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
$
104,861

 
$
(656
)
 
$
66,579

 
$
(2,143
)
 
$
171,440

 
$
(2,799
)
Agency-guaranteed commercial mortgage-backed securities
115,970

 
(740
)
 
6,151

 
(29
)
 
122,121

 
(769
)
Total
$
220,831

 
$
(1,396
)
 
$
72,730

 
$
(2,172
)
 
$
293,561

 
$
(3,568
)

 
December 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
$
87,433

 
$
(1,330
)
 
$
30,592

 
$
(1,327
)
 
$
118,025

 
$
(2,657
)
Agency-guaranteed commercial mortgage-backed securities
201,817

 
(2,872
)
 
—

 
—

 
201,817

 
(2,872
)
Corporate notes (1)
9,747

 
(185
)
 
—

 
—

 
9,747

 
(185
)
Total
$
298,997

 
$
(4,387
)
 
$
30,592

 
$
(1,327
)
 
$
329,589

 
$
(5,714
)
(1)
Includes subordinated debt issued by other bank holding companies.