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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2017 and December 31, 2016 are summarized in the tables below:
 
June 30, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
(amounts in thousands)
 
 
 
 
 
 
 
Available for Sale:
 
 
 
 
 
 
 
Agency-guaranteed residential mortgage-backed securities
$
210,688

 
$
755

 
$
(1,699
)
 
$
209,744

Agency-guaranteed commercial real estate mortgage-backed securities
735,116

 
11,318

 
(11
)
 
746,423

Corporate notes (1)
44,956

 
821

 
—

 
45,777

Equity securities (2)
10,661

 
—

 
—

 
10,661

 
$
1,001,421

 
$
12,894

 
$
(1,710
)
 
$
1,012,605

(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

 
$
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 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, 2017 and 2016:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
(amounts in thousands)
 
 
 
 
 
 
 
Proceeds from sale of available-for-sale securities
$
115,982

 
$
—

 
$
115,982

 
$
2,848

Gross gains
$
3,183

 
$
—

 
$
3,183

 
$
26

Gross losses
—

 
—

 
—

 
—

Net gains
$
3,183

 
$
—

 
$
3,183

 
$
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:
 
June 30, 2017
 
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
42,956

 
43,602

Due after ten years
2,000

 
2,175

Agency-guaranteed residential mortgage-backed securities
210,688

 
209,744

Agency-guaranteed commercial real estate mortgage-backed securities
735,116

 
746,423

Total debt securities
$
990,760

 
$
1,001,944
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, 2017 and December 31, 2016 were as follows:
 
June 30, 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
$
76,237

 
$
(660
)
 
$
29,797

 
$
(1,039
)
 
$
106,034

 
$
(1,699
)
Agency-guaranteed commercial real estate mortgage-backed securities
6,172

 
(11
)
 
—

 
—

 
6,172

 
(11
)
Total
$
82,409

 
$
(671
)
 
$
29,797

 
$
(1,039
)
 
$
112,206

 
$
(1,710
)
(1) Includes subordinated debt issued by other bank holding companies.
 
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 real estate 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.