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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017
 
December 31, 2016
 
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
$
10,988

 
$
930

 
$
—

 
$
11,918

 
$
15,143

 
$
1,481

 
$
(7
)
 
$
16,617

Mortgage-Backed Securities – Commercial
24,684

 
—

 
(217
)
 
24,467

 
—

 
—

 
—

 
—

Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 

 
 
 
 
 
 
 

Mortgage-Backed Securities – Residential
662,858

 
4,497

 
(6,584
)
 
660,771

 
683,601

 
4,557

 
(11,305
)
 
676,853

Mortgage-Backed Securities – Commercial
—

 
—

 
—

 
—

 
1

 
—

 
—

 
1

Other Government-Sponsored Enterprises
1,097

 
—

 
—

 
1,097

 
16,700

 
—

 
(69
)
 
16,631

Obligations of States and Political Subdivisions
27,081

 
433

 
—

 
27,514

 
27,075

 
195

 
(41
)
 
27,229

Corporate Securities
15,903

 
675

 
—

 
16,578

 
5,903

 
416

 
—

 
6,319

Pooled Trust Preferred Collateralized Debt Obligations
40,594

 
516

 
(6,481
)
 
34,629

 
39,989

 
427

 
(7,124
)
 
33,292

Total Debt Securities
783,205

 
7,051

 
(13,282
)
 
776,974

 
788,412

 
7,076

 
(18,546
)
 
776,942

Equities
1,670

 
—

 
—

 
1,670

 
1,670

 
—

 
—

 
1,670

Total Securities Available for Sale
$
784,875

 
$
7,051

 
$
(13,282
)
 
$
778,644

 
$
790,082

 
$
7,076

 
$
(18,546
)
 
$
778,612
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, 2017, by contractual maturity, are shown below.
 
Amortized
Cost
 
Estimated
Fair Value
 
(dollars in thousands)
Due within 1 year
$
997

 
$
997

Due after 1 but within 5 years
14,088

 
14,214

Due after 5 but within 10 years
27,081

 
27,515

Due after 10 years
42,509

 
37,092

 
84,675

 
79,818

Mortgage-Backed Securities (a)
698,530

 
697,156

Total Debt Securities
$
783,205

 
$
776,974

 
(a)
Mortgage-Backed Securities include an amortized cost of $35.7 million and a fair value of $36.4 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:
 
2017
 
2016
 
(dollars in thousands)
Proceeds from sales
$
143,660

 
$
55,744

Gross gains (losses) realized:
 
 
 
Sales Transactions:
 
 
 
Gross gains
$
359

 
$
304

Gross losses
(316
)
 
(276
)
 
43

 
28

Maturities and impairment
 
 
 
Gross gains
712

 
—

Gross losses
(60
)
 
—

 
652

 
—

Net gains and impairment
$
695

 
$
28