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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2018
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, 2018
 
December 31, 2017
 
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
$
10,100

 
$
646

 
$
(81
)
 
$
10,665

 
$
10,556

 
$
789

 
$
(7
)
 
$
11,338

Mortgage-Backed Securities – Commercial
73,389

 
—

 
(1,252
)
 
72,137

 
24,611

 
—

 
(462
)
 
24,149

Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 

 
 
 
 
 
 
 

Mortgage-Backed Securities – Residential
681,343

 
1,913

 
(18,468
)
 
664,788

 
632,422

 
2,622

 
(9,489
)
 
625,555

Other Government-Sponsored Enterprises
1,100

 
—

 
(2
)
 
1,098

 
1,098

 
—

 
(1
)
 
1,097

Obligations of States and Political Subdivisions
27,086

 
121

 
(46
)
 
27,161

 
27,083

 
327

 
—

 
27,410

Corporate Securities
20,898

 
542

 
(214
)
 
21,226

 
15,907

 
590

 
(4
)
 
16,493

Pooled Trust Preferred Collateralized Debt Obligations
13,602

 
1,252

 
(722
)
 
14,132

 
27,499

 
526

 
(4,379
)
 
23,646

Total Debt Securities
827,518

 
4,474

 
(20,785
)
 
811,207

 
739,176

 
4,854

 
(14,342
)
 
729,688

Equities
1,670

 
—

 
—

 
1,670

 
1,670

 
—

 
—

 
1,670

Total Securities Available for Sale
$
829,188

 
$
4,474

 
$
(20,785
)
 
$
812,877

 
$
740,846

 
$
4,854

 
$
(14,342
)
 
$
731,358
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, 2018, by contractual maturity, are shown below.
 
Amortized
Cost
 
Estimated
Fair Value
 
(dollars in thousands)
Due within 1 year
$
5,099

 
$
5,073

Due after 1 but within 5 years
15,727

 
15,541

Due after 5 but within 10 years
26,337

 
26,409

Due after 10 years
15,523

 
16,594

 
62,686

 
63,617

Mortgage-Backed Securities (a)
764,832

 
747,590

Total Debt Securities
$
827,518

 
$
811,207

 
(a)
Mortgage-Backed Securities include an amortized cost of $83.5 million and a fair value of $82.8 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:
 
2018
 
2017
 
(dollars in thousands)
Proceeds from sales
$
—

 
$
—

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

 
$
—

Gross losses
—

 
—

 
—

 
—

Maturities and impairment
 
 
 
Gross gains
2,840

 
652

Gross losses
—

 
—

 
2,840

 
652

Net gains and impairment
$
2,840

 
$
652