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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 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:
 
March 31, 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
$
8,731

 
$
539

 
$
(24
)
 
$
9,246

 
$
9,011

 
$
479

 
$
(84
)
 
$
9,406

Mortgage-Backed Securities – Commercial
169,153

 
457

 
(1,490
)
 
168,120

 
169,633

 
214

 
(2,103
)
 
167,744

Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 

 
 
 
 
 
 
 

Mortgage-Backed Securities – Residential
660,080

 
2,749

 
(8,863
)
 
653,966

 
686,906

 
1,846

 
(15,391
)
 
673,361

Other Government-Sponsored Enterprises
10,000

 
6

 
—

 
10,006

 
10,000

 
12

 
—

 
10,012

Obligations of States and Political Subdivisions
28,010

 
204

 
—

 
28,214

 
27,592

 
126

 
(6
)
 
27,712

Corporate Securities
22,903

 
665

 
(19
)
 
23,549

 
20,912

 
321

 
(221
)
 
21,012

Total Securities Available for Sale
$
898,877

 
$
4,620

 
$
(10,396
)
 
$
893,101

 
$
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 March 31, 2019, by contractual maturity, are shown below.
 
Amortized
Cost
 
Estimated
Fair Value
 
(dollars in thousands)
Due within 1 year
$
—

 
$
—

Due after 1 but within 5 years
27,333

 
27,588

Due after 5 but within 10 years
33,580

 
34,181

Due after 10 years
—

 
—

 
60,913

 
61,769

Mortgage-Backed Securities (a)
837,964

 
831,332

Total Debt Securities
$
898,877

 
$
893,101

 
(a)
Mortgage-Backed Securities include an amortized cost of $177.9 million and a fair value of $177.4 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $660.1 million and a fair value of $654.0 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 three months ended March 31:
 
2019
 
2018
 
(dollars in thousands)
Proceeds from sales
$
—

 
$
—

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

 
$
—

Gross losses
—

 
—

 
—

 
—

Maturities and impairment
 
 
 
Gross gains
—

 
2,840

Gross losses
—

 
—

 
—

 
2,840

Net gains and impairment
$
—

 
$
2,840