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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2015
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:
 
September 30, 2015
 
December 31, 2014
 
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
$
20,902

 
$
2,379

 
$
—

 
$
23,281

 
$
23,344

 
$
2,595

 
$
(3
)
 
$
25,936

Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 

 
 
 
 
 
 
 

Mortgage-Backed Securities – Residential
816,179

 
12,819

 
(4,846
)
 
824,152

 
947,635

 
13,076

 
(9,830
)
 
950,881

Mortgage-Backed Securities – Commercial
37

 
1

 
—

 
38

 
72

 
2

 
—

 
74

Other Government-Sponsored Enterprises
135,853

 
19

 
(91
)
 
135,781

 
269,181

 
4

 
(1,308
)
 
267,877

Obligations of States and Political Subdivisions
27,064

 
397

 
(12
)
 
27,449

 
27,058

 
362

 
(43
)
 
27,377

Corporate Securities
1,895

 
438

 
—

 
2,333

 
6,682

 
573

 
—

 
7,255

Pooled Trust Preferred Collateralized Debt Obligations
42,000

 
1,016

 
(7,237
)
 
35,779

 
41,926

 
309

 
(13,236
)
 
28,999

Total Debt Securities
1,043,930

 
17,069

 
(12,186
)
 
1,048,813

 
1,315,898

 
16,921

 
(24,420
)
 
1,308,399

Equities
1,920

 
—

 
—

 
1,920

 
1,420

 
—

 
—

 
1,420

Total Securities Available for Sale
$
1,045,850

 
$
17,069

 
$
(12,186
)
 
$
1,050,733

 
$
1,317,318

 
$
16,921

 
$
(24,420
)
 
$
1,309,819
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 September 30, 2015, by contractual maturity, are shown below.
 
Amortized
Cost
 
Estimated
Fair Value
 
(dollars in thousands)
Due within 1 year
$
3,000

 
$
3,000

Due after 1 but within 5 years
132,852

 
132,781

Due after 5 but within 10 years
25,657

 
26,031

Due after 10 years
45,303

 
39,530

 
206,812

 
201,342

Mortgage-Backed Securities (a)
837,118

 
847,471

Total Debt Securities
$
1,043,930

 
$
1,048,813

 
(a)
Mortgage Backed Securities include an amortized cost of $20.9 million and a fair value of $23.3 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 nine months ended September 30:
 
2015
 
2014
 
(dollars in thousands)
Proceeds from sales
$
—

 
$
132,868

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

 
$
489

Gross losses
—

 
(441
)
 
—

 
48

Maturities and impairment
 
 
 
Gross gains
125

 
2

Gross losses
—

 
—

Other-than-temporary impairment
—

 
—

 
125

 
2

Net gains and impairment
$
125

 
$
50