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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 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:
 
March 31, 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
$
19,380

 
$
2,320

 
$
—

 
$
21,700

 
$
20,034

 
$
2,071

 
$
(13
)
 
$
22,092

Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 

 
 
 
 
 
 
 

Mortgage-Backed Securities – Residential
768,405

 
12,917

 
(1,697
)
 
779,625

 
778,476

 
7,983

 
(8,882
)
 
777,577

Mortgage-Backed Securities – Commercial
23

 
—

 
—

 
23

 
28

 
—

 
—

 
28

Other Government-Sponsored Enterprises
19,201

 
7

 
(5
)
 
19,203

 
19,201

 
2

 
(85
)
 
19,118

Obligations of States and Political Subdivisions
27,068

 
764

 
—

 
27,832

 
27,066

 
532

 
—

 
27,598

Corporate Securities
5,896

 
440

 
—

 
6,336

 
1,897

 
422

 
—

 
2,319

Pooled Trust Preferred Collateralized Debt Obligations
42,500

 
476

 
(9,703
)
 
33,273

 
42,239

 
916

 
(7,497
)
 
35,658

Total Debt Securities
882,473

 
16,924

 
(11,405
)
 
887,992

 
888,941

 
11,926

 
(16,477
)
 
884,390

Equities
2,206

 
—

 
—

 
2,206

 
2,170

 
—

 
—

 
2,170

Total Securities Available for Sale
$
884,679

 
$
16,924

 
$
(11,405
)
 
$
890,198

 
$
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 March 31, 2016, by contractual maturity, are shown below.
 
Amortized
Cost
 
Estimated
Fair Value
 
(dollars in thousands)
Due within 1 year
$
2,601

 
$
2,601

Due after 1 but within 5 years
20,596

 
20,640

Due after 5 but within 10 years
27,068

 
27,832

Due after 10 years
44,400

 
35,571

 
94,665

 
86,644

Mortgage-Backed Securities (a)
787,808

 
801,348

Total Debt Securities
$
882,473

 
$
887,992

 
(a)
Mortgage Backed Securities include an amortized cost of $19.4 million and a fair value of $21.7 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 three months ended March 31:
 
2016
 
2015
 
(dollars in thousands)
Proceeds from sales
$
—

 
$
—

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

 
$
—

Gross losses
—

 
—

 
—

 
—

Maturities and impairment
 
 
 
Gross gains
—

 
105

Gross losses
—

 
—

Other-than-temporary impairment
—

 
—

 
—

 
105

Net gains and impairment
$
—

 
$
105