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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]  
Analysis of Amortized Cost and Estimated Fair Values of Securities Available for Sale
Below is an analysis of the amortized cost and fair values of securities available for sale at December 31:
 
2014
 
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
$
23,344

 
$
2,595

 
$
(3
)
 
$
25,936

 
$
22,639

 
$
2,624

 
$
(59
)
 
$
25,204

Obligations of U.S. Government-Sponsored Enterprises:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-Backed Securities – Residential
947,635

 
13,076

 
(9,830
)
 
950,881

 
1,009,519

 
12,531

 
(27,163
)
 
994,887

Mortgage-Backed Securities – Commercial
72

 
2

 
—

 
74

 
104

 
1

 
—

 
105

Other Government-Sponsored Enterprises
269,181

 
4

 
(1,308
)
 
267,877

 
267,971

 
81

 
(1,927
)
 
266,125

Obligations of States and Political Subdivisions
27,058

 
362

 
(43
)
 
27,377

 
80

 
—

 
—

 
80

Corporate Securities
6,682

 
573

 
—

 
7,255

 
6,693

 
328

 
—

 
7,021

Pooled Trust Preferred Collateralized Debt Obligations
41,926

 
309

 
(13,236
)
 
28,999

 
42,040

 
—

 
(18,517
)
 
23,523

Total Debt Securities
1,315,898

 
16,921

 
(24,420
)
 
1,308,399

 
1,349,046

 
15,565

 
(47,666
)
 
1,316,945

Equities
1,420

 
—

 
—

 
1,420

 
1,420

 
—

 
—

 
1,420

Total Securities Available for Sale
$
1,317,318

 
$
16,921

 
$
(24,420
)
 
$
1,309,819

 
$
1,350,466

 
$
15,565

 
$
(47,666
)
 
$
1,318,365

The amortized cost and fair value of debt securities at December 31, 2014, by contractual maturity, are shown below:
 
Amortized
Cost
 
Estimated
Fair Value
 
(dollars in thousands)
Due within 1 year
$
3,000

 
$
2,998

Due after 1 but within 5 years
266,181

 
264,879

Due after 5 but within 10 years
21,849

 
22,104

Due after 10 years
53,817

 
41,527

 
344,847

 
331,508

Mortgage-Backed Securities (a)
971,051

 
976,891

Total Debt Securities
$
1,315,898

 
$
1,308,399

 
(a)
Mortgage Backed Securities include an amortized cost of $23.3 million and a fair value of $25.9 million for Obligations of U.S. Government agencies issued by Ginnie Mae and Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac, which had an amortized cost of $947.7 million and a fair value of $951.0 million.
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 years ended December 31:
 
2014
 
2013
 
2012
 
(dollars in thousands)
Proceeds from sales
$
132,868

 
$
671

 
$
—

Gross (losses) gains realized:
 
 
 
 
 
Sales Transactions:
 
 
 
 
 
Gross gains
$
291

 
$
233

 
$
—

Gross losses
(243
)
 
—

 
—

 
48

 
233

 
—

Maturities and impairment
 
 
 
 
 
Gross gains
502

 
4

 
192

Gross losses
—

 
(1,395
)
 
—

Other-than-temporary impairment
—

 
—

 
—

 
502

 
(1,391
)
 
192

Net gains and impairment
$
550

 
$
(1,158
)
 
$
192