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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2019
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, 2019
 
December 31, 2018
 
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
$
8,112

 
$
655

 
$
—

 
$
8,767

 
$
9,011

 
$
479

 
$
(84
)
 
$
9,406

Mortgage-Backed Securities – Commercial
168,006

 
3,585

 
—

 
171,591

 
169,633

 
214

 
(2,103
)
 
167,744

Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 

 
 
 
 
 
 
 

Mortgage-Backed Securities – Residential
583,158

 
4,260

 
(2,594
)
 
584,824

 
686,906

 
1,846

 
(15,391
)
 
673,361

Other Government-Sponsored Enterprises
1,000

 
—

 
(2
)
 
998

 
10,000

 
12

 
—

 
10,012

Obligations of States and Political Subdivisions
21,959

 
209

 
—

 
22,168

 
27,592

 
126

 
(6
)
 
27,712

Corporate Securities
22,914

 
1,121

 
—

 
24,035

 
20,912

 
321

 
(221
)
 
21,012

Total Securities Available for Sale
$
805,149

 
$
9,830

 
$
(2,596
)
 
$
812,383

 
$
924,054

 
$
2,998

 
$
(17,805
)
 
$
909,247
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, 2019, by contractual maturity, are shown below.
 
Amortized
Cost
 
Estimated
Fair Value
 
(dollars in thousands)
Due within 1 year
$
1,527

 
$
1,531

Due after 1 but within 5 years
36,106

 
36,779

Due after 5 but within 10 years
8,240

 
8,891

Due after 10 years
—

 
—

 
45,873

 
47,201

Mortgage-Backed Securities (a)
759,276

 
765,182

Total Debt Securities
$
805,149

 
$
812,383

 
(a)
Mortgage-backed and collateralized mortgage securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds. Mortgage-Backed Securities include an amortized cost of $176.1 million and a fair value of $180.4 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $583.2 million and a fair value of $584.8 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac
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:
 
2019
 
2018
 
(dollars in thousands)
Proceeds from sales
$
—

 
$
15,939

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

 
$
4,719

Gross losses
—

 
—

 
—

 
4,719

Maturities
 
 
 
Gross gains
15

 
3,383

Gross losses
—

 
—

 
15

 
3,383

Net gains and impairment
$
15

 
$
8,102