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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]  
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, 2014
 
December 31, 2013
 
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
$
20,686

 
$
2,617

 
$
—

 
$
23,303

 
$
22,639

 
$
2,624

 
$
(59
)
 
$
25,204

Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 

 
 
 
 
 
 
 

Mortgage-Backed Securities – Residential
1,001,669

 
15,257

 
(13,807
)
 
1,003,119

 
1,009,519

 
12,531

 
(27,163
)
 
994,887

Mortgage-Backed Securities – Commercial
88

 
2

 
—

 
90

 
104

 
1

 
—

 
105

Other Government-Sponsored Enterprises
269,175

 
15

 
(803
)
 
268,387

 
267,971

 
81

 
(1,927
)
 
266,125

Obligations of States and Political Subdivisions
15,738

 
156

 
(5
)
 
15,889

 
80

 
—

 
—

 
80

Corporate Securities
6,688

 
561

 
—

 
7,249

 
6,693

 
328

 
—

 
7,021

Pooled Trust Preferred Collateralized Debt Obligations
41,851

 
109

 
(13,806
)
 
28,154

 
42,040

 
—

 
(18,517
)
 
23,523

Total Debt Securities
1,355,895

 
18,717

 
(28,421
)
 
1,346,191

 
1,349,046

 
15,565

 
(47,666
)
 
1,316,945

Equities
1,420

 
—

 
—

 
1,420

 
1,420

 
—

 
—

 
1,420

Total Securities Available for Sale
$
1,357,315

 
$
18,717

 
$
(28,421
)
 
$
1,347,611

 
$
1,350,466

 
$
15,565

 
$
(47,666
)
 
$
1,318,365
Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale
he amortized cost and estimated fair value of debt securities available for sale at June 30, 2014, by contractual maturity, are shown below.
 
Amortized
Cost
 
Estimated
Fair Value
 
(dollars in thousands)
Due within 1 year
$
2,600

 
$
2,601

Due after 1 but within 5 years
266,575

 
265,786

Due after 5 but within 10 years
8,402

 
8,506

Due after 10 years
55,875

 
42,786

 
333,452

 
319,679

Mortgage-Backed Securities (a)
1,022,443

 
1,026,512

Total Debt Securities
$
1,355,895

 
$
1,346,191

 
(a)
Mortgage Backed Securities include an amortized cost of $20.7 million and a fair value of $23.3 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 six months ended June 30:
 
2014
 
2013
 
(dollars in thousands)
Proceeds from sales
$
—

 
$
42

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

 
$
4

Gross losses
—

 
—

 
—

 
4

Maturities and impairment
 
 
 
Gross gains
2

 
4

Gross losses
—

 
—

 
2

 
4

Net gains and impairment
$
2

 
$
8