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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 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:
 
March 31, 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
$
14,585

 
$
1,440

 
$
(7
)
 
$
16,018

 
$
15,143

 
$
1,481

 
$
(7
)
 
$
16,617

Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 

 
 
 
 
 
 
 

Mortgage-Backed Securities – Residential
726,240

 
4,513

 
(9,799
)
 
720,954

 
683,601

 
4,557

 
(11,305
)
 
676,853

Mortgage-Backed Securities – Commercial
—

 
—

 
—

 
—

 
1

 
—

 
—

 
1

Other Government-Sponsored Enterprises
16,700

 
—

 
(58
)
 
16,642

 
16,700

 
—

 
(69
)
 
16,631

Obligations of States and Political Subdivisions
27,077

 
283

 
—

 
27,360

 
27,075

 
195

 
(41
)
 
27,229

Corporate Securities
15,896

 
476

 
(3
)
 
16,369

 
5,903

 
416

 
—

 
6,319

Pooled Trust Preferred Collateralized Debt Obligations
40,165

 
530

 
(6,954
)
 
33,741

 
39,989

 
427

 
(7,124
)
 
33,292

Total Debt Securities
840,663

 
7,242

 
(16,821
)
 
831,084

 
788,412

 
7,076

 
(18,546
)
 
776,942

Equities
1,670

 
—

 
—

 
1,670

 
1,670

 
—

 
—

 
1,670

Total Securities Available for Sale
$
842,333

 
$
7,242

 
$
(16,821
)
 
$
832,754

 
$
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 March 31, 2017, by contractual maturity, are shown below.
 
Amortized
Cost
 
Estimated
Fair Value
 
(dollars in thousands)
Due within 1 year
$
3,300

 
$
3,294

Due after 1 but within 5 years
27,386

 
27,361

Due after 5 but within 10 years
27,077

 
27,360

Due after 10 years
42,075

 
36,097

 
99,838

 
94,112

Mortgage-Backed Securities (a)
740,825

 
736,972

Total Debt Securities
$
840,663

 
$
831,084

 
(a)
Mortgage-Backed Securities include an amortized cost of $14.6 million and a fair value of $16.0 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:
 
2017
 
2016
 
(dollars in thousands)
Proceeds from sales
$
—

 
$
—

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

 
$
—

Gross losses
—

 
—

 
—

 
—

Maturities and impairment
 
 
 
Gross gains
652

 
—

Gross losses
—

 
—

Other-than-temporary impairment
—

 
—

 
652

 
—

Net gains and impairment
$
652

 
$
—