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Investment Securities (Tables)
 6 Months Ended
Jun. 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:
 
June 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
$
8,373

 
$
580

 
$
—

 
$
8,953

 
$
9,011

 
$
479

 
$
(84
)
 
$
9,406

Mortgage-Backed Securities – Commercial
168,626

 
2,121

 
(202
)
 
170,545

 
169,633

 
214

 
(2,103
)
 
167,744

Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 

 
 
 
 
 
 
 

Mortgage-Backed Securities – Residential
625,242

 
4,248

 
(3,911
)
 
625,579

 
686,906

 
1,846

 
(15,391
)
 
673,361

Other Government-Sponsored Enterprises
10,000

 
3

 
—

 
10,003

 
10,000

 
12

 
—

 
10,012

Obligations of States and Political Subdivisions
26,663

 
226

 
—

 
26,889

 
27,592

 
126

 
(6
)
 
27,712

Corporate Securities
22,908

 
1,026

 
—

 
23,934

 
20,912

 
321

 
(221
)
 
21,012

Total Securities Available for Sale
$
861,812

 
$
8,204

 
$
(4,113
)
 
$
865,903

 
$
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 June 30, 2019, by contractual maturity, are shown below.
 
Amortized
Cost
 
Estimated
Fair Value
 
(dollars in thousands)
Due within 1 year
$
630

 
$
631

Due after 1 but within 5 years
32,735

 
33,334

Due after 5 but within 10 years
26,206

 
26,861

Due after 10 years
—

 
—

 
59,571

 
60,826

Mortgage-Backed Securities (a)
802,241

 
805,077

Total Debt Securities
$
861,812

 
$
865,903

 
(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 $177.0 million and a fair value of $179.5 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $625.2 million and a fair value of $625.6 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 six months ended June 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
6

 
3,383

Gross losses
—

 
—

 
6

 
3,383

Net gains and impairment
$
6

 
$
8,102