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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 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:
 
March 31, 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
$
21,648

 
$
2,627

 
$
(34
)
 
$
24,241

 
$
22,639

 
$
2,624

 
$
(59
)
 
$
25,204

Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 

 
 
 
 
 
 
 

Mortgage-Backed Securities – Residential
1,020,102

 
12,977

 
(19,472
)
 
1,013,607

 
1,009,519

 
12,531

 
(27,163
)
 
994,887

Mortgage-Backed Securities – Commercial
96

 
2

 
—

 
98

 
104

 
1

 
—

 
105

Other Government-Sponsored Enterprises
269,170

 
3

 
(1,863
)
 
267,310

 
267,971

 
81

 
(1,927
)
 
266,125

Obligations of States and Political Subdivisions
9,340

 
22

 
(3
)
 
9,359

 
80

 
—

 
—

 
80

Corporate Securities
6,691

 
437

 
—

 
7,128

 
6,693

 
328

 
—

 
7,021

Pooled Trust Preferred Collateralized Debt Obligations
42,214

 
—

 
(14,338
)
 
27,876

 
42,040

 
—

 
(18,517
)
 
23,523

Total Debt Securities
1,369,261

 
16,068

 
(35,710
)
 
1,349,619

 
1,349,046

 
15,565

 
(47,666
)
 
1,316,945

Equities
1,420

 
—

 
—

 
1,420

 
1,420

 
—

 
—

 
1,420

Total Securities Available for Sale
$
1,370,681

 
$
16,068

 
$
(35,710
)
 
$
1,351,039

 
$
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 March 31, 2014, by contractual maturity, are shown below.
 
Amortized
Cost
 
Estimated
Fair Value
 
(dollars in thousands)
Due within 1 year
$
5,601

 
$
5,604

Due after 1 but within 5 years
263,570

 
261,706

Due after 5 but within 10 years
3,371

 
3,381

Due after 10 years
54,873

 
40,982

 
327,415

 
311,673

Mortgage-Backed Securities (a)
1,041,846

 
1,037,946

Total Debt Securities
$
1,369,261

 
$
1,349,619

 
(a)
Mortgage Backed Securities include an amortized cost of $21.6 million and a fair value of $24.2 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:
 
2014
 
2013
 
(dollars in thousands)
Proceeds from sales
$
—

 
$
42

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

 
$
4

Gross losses
—

 
—

Net gains and impairment
$
—

 
$
4