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Investment Securities (Tables)
 6 Months Ended
Jun. 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:
 
June 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
$
13,839

 
$
1,352

 
$
(7
)
 
$
15,184

 
$
15,143

 
$
1,481

 
$
(7
)
 
$
16,617

Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 

 
 
 
 
 
 
 

Mortgage-Backed Securities – Residential
694,114

 
4,638

 
(8,063
)
 
690,689

 
683,601

 
4,557

 
(11,305
)
 
676,853

Mortgage-Backed Securities – Commercial
—

 
—

 
—

 
—

 
1

 
—

 
—

 
1

Other Government-Sponsored Enterprises
1,096

 
—

 
—

 
1,096

 
16,700

 
—

 
(69
)
 
16,631

Obligations of States and Political Subdivisions
27,079

 
476

 
—

 
27,555

 
27,075

 
195

 
(41
)
 
27,229

Corporate Securities
15,899

 
505

 
—

 
16,404

 
5,903

 
416

 
—

 
6,319

Pooled Trust Preferred Collateralized Debt Obligations
40,378

 
463

 
(7,193
)
 
33,648

 
39,989

 
427

 
(7,124
)
 
33,292

Total Debt Securities
792,405

 
7,434

 
(15,263
)
 
784,576

 
788,412

 
7,076

 
(18,546
)
 
776,942

Equities
1,670

 
—

 
—

 
1,670

 
1,670

 
—

 
—

 
1,670

Total Securities Available for Sale
$
794,075

 
$
7,434

 
$
(15,263
)
 
$
786,246

 
$
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 June 30, 2017, by contractual maturity, are shown below.
 
Amortized
Cost
 
Estimated
Fair Value
 
(dollars in thousands)
Due within 1 year
$
996

 
$
997

Due after 1 but within 5 years
14,087

 
14,176

Due after 5 but within 10 years
27,079

 
27,555

Due after 10 years
42,290

 
35,975

 
84,452

 
78,703

Mortgage-Backed Securities (a)
707,953

 
705,873

Total Debt Securities
$
792,405

 
$
784,576

 
(a)
Mortgage-Backed Securities include an amortized cost of $13.8 million and a fair value of $15.2 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:
 
2017
 
2016
 
(dollars in thousands)
Proceeds from sales
$
103,618

 
$
55,744

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

 
$
304

Gross losses
(49
)
 
(276
)
 
(49
)
 
28

Maturities and impairment
 
 
 
Gross gains
712

 
—

Gross losses
(60
)
 
—

 
652

 
—

Net gains and impairment
$
603

 
$
28