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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2016
Schedule of Held-to-maturity Securities [Line Items]  
Analysis of Amortized Cost and Estimated Fair Value of Securities Available for Sale
Below is an analysis of the amortized cost and estimated fair values of securities available for sale at:
 
June 30, 2016
 
December 31, 2015
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
 
(dollars in thousands)
Obligations of U.S. Government Agencies:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-Backed Securities – Residential
$
16,730

 
$
2,032

 
$
—

 
$
18,762

 
$
20,034

 
$
2,071

 
$
(13
)
 
$
22,092

Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 

 
 
 
 
 
 
 

Mortgage-Backed Securities – Residential
732,618

 
15,012

 
(234
)
 
747,396

 
778,476

 
7,983

 
(8,882
)
 
777,577

Mortgage-Backed Securities – Commercial
2

 
—

 
—

 
2

 
28

 
—

 
—

 
28

Other Government-Sponsored Enterprises
19,300

 
22

 
—

 
19,322

 
19,201

 
2

 
(85
)
 
19,118

Obligations of States and Political Subdivisions
27,071

 
965

 
—

 
28,036

 
27,066

 
532

 
—

 
27,598

Corporate Securities
5,898

 
524

 
—

 
6,422

 
1,897

 
422

 
—

 
2,319

Pooled Trust Preferred Collateralized Debt Obligations
42,750

 
500

 
(9,527
)
 
33,723

 
42,239

 
916

 
(7,497
)
 
35,658

Total Debt Securities
844,369

 
19,055

 
(9,761
)
 
853,663

 
888,941

 
11,926

 
(16,477
)
 
884,390

Equities
1,670

 
—

 
—

 
1,670

 
2,170

 
—

 
—

 
2,170

Total Securities Available for Sale
$
846,039

 
$
19,055

 
$
(9,761
)
 
$
855,333

 
$
891,111

 
$
11,926

 
$
(16,477
)
 
$
886,560
Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale
The amortized cost and estimated fair value of debt securities available for sale at June 30, 2016, by contractual maturity, are shown below.
 
Amortized
Cost
 
Estimated
Fair Value
 
(dollars in thousands)
Due within 1 year
$
2,601

 
$
2,602

Due after 1 but within 5 years
20,696

 
20,780

Due after 5 but within 10 years
27,070

 
28,036

Due after 10 years
44,652

 
36,085

 
95,019

 
87,503

Mortgage-Backed Securities (a)
749,350

 
766,160

Total Debt Securities
$
844,369

 
$
853,663

 
(a)
Mortgage Backed Securities include an amortized cost of $16.7 million and a fair value of $18.8 million for Obligations of U.S.
Proceeds from Sale, Gross Gains (Losses) Realized on Sales, Maturities and Other-Than-Temporary Impairment Charges Related to Securities Available for Sale
Proceeds from sales, gross gains (losses) realized on sales, maturities and other-than-temporary impairment charges related to securities available for sale were as follows for the six months ended June 30:
 
2016
 
2015
 
(dollars in thousands)
Proceeds from sales
$
55,744

 
$
—

Gross gains (losses) realized:
 
 
 
Sales Transactions:
 
 
 
Gross gains
$
304

 
$
—

Gross losses
(276
)
 
—

 
28

 
—

Maturities and impairment
 
 
 
Gross gains
—

 
105

Gross losses
—

 
—

Other-than-temporary impairment
—

 
—

 
—

 
105

Net gains and impairment
$
28

 
$
105