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Investments (Tables)
9 Months Ended
Sep. 30, 2011
Investments [Abstract] 
Aggregate Values And Unrealized Gains And Losses Of Investment Securities
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Investment securities available for sale
 
 
 
 
 
 
 
September 30, 2011
 
 
 
 
 
 
 
U. S. Treasury
$
986,507

 
$
1,427

 
$
—

 
$
987,934

Government agency
2,261,000

 
2,344

 
2,435

 
2,260,909

Corporate bonds
401,048

 
3,595

 
—

 
404,643

Residential mortgage-backed securities
315,474

 
8,916

 
198

 
324,192

Equity securities
939

 
15,165

 
—

 
16,104

State, county and municipal
1,027

 
16

 
—

 
1,043

Total investment securities available for sale
$
3,965,995

 
$
31,463

 
$
2,633

 
$
3,994,825

December 31, 2010
 
 
 
 
 
 
 
U. S. Treasury
$
1,935,666

 
$
4,041

 
$
307

 
$
1,939,400

Government agency
1,930,469

 
361

 
10,844

 
1,919,986

Corporate bonds
479,160

 
7,498

 
—

 
486,658

Residential mortgage-backed securities
139,291

 
4,522

 
268

 
143,545

Equity securities
1,055

 
18,176

 
—

 
19,231

State, county and municipal
1,240

 
20

 
4

 
1,256

Total investment securities available for sale
$
4,486,881

 
$
34,618

 
$
11,423

 
$
4,510,076

September 30, 2010
 
 
 
 
 
 
 
U. S. Treasury
$
1,991,676

 
$
7,259

 
$
—

 
$
1,998,935

Government agency
1,120,476

 
1,840

 
—

 
1,122,316

Corporate bonds
479,935

 
9,254

 
—

 
489,189

Residential mortgage-backed securities
151,355

 
4,891

 
110

 
156,136

Equity securities
1,132

 
17,865

 
—

 
18,997

State, county and municipal
1,241

 
27

 
—

 
1,268

Total investment securities available for sale
$
3,745,815

 
$
41,136

 
$
110

 
$
3,786,841

Investment securities held to maturity
 
 
 
 
 
 
 
September 30, 2011
 
 
 
 
 
 
 
Residential mortgage-backed securities
$
1,943

 
$
191

 
$
26

 
$
2,108

December 31, 2010
 
 
 
 
 
 
 
Residential mortgage-backed securities
$
2,532

 
$
235

 
$
26

 
$
2,741

September 30, 2010
 
 
 
 
 
 
 
Residential mortgage-backed securities
$
2,645

 
$
245

 
$
26

 
$
2,864

 
 
 
 
 
 
 
 
Investment Securities Maturity Information
 
September 30, 2011
 
December 31, 2010
 
September 30, 2010
 
Cost
 
Fair
Value
 
Cost
 
Fair
Value
 
Cost
 
Fair
Value
Investment securities available for sale
 
 
 
 
 
 
 
 
 
 
 
Maturing in:
 
 
 
 
 
 
 
 
 
 
 
One year or less
$
3,398,267

 
$
3,401,530

 
$
3,441,185

 
$
3,436,818

 
$
2,559,784

 
$
2,567,076

One through five years
289,046

 
291,064

 
916,101

 
921,536

 
1,044,757

 
1,056,170

Five through 10 years
106,329

 
106,901

 
1,683

 
1,710

 
1,815

 
1,841

Over 10 years
171,414

 
179,226

 
126,857

 
130,781

 
138,327

 
142,757

Equity securities
939

 
16,104

 
1,055

 
19,231

 
1,132

 
18,997

Total investment securities available for sale
$
3,965,995

 
$
3,994,825

 
$
4,486,881

 
$
4,510,076

 
$
3,745,815

 
$
3,786,841

Investment securities held to maturity
 
 
 
 
 
 
 
 
 
 
 
Maturing in:
 
 
 
 
 
 
 
 
 
 
 
One through five years
$
13

 
$
12

 
$
—

 
$
—

 
$
—

 
$
—

Five through 10 years
1,816

 
1,940

 
2,404

 
2,570

 
2,512

 
2,689

Over 10 years
114

 
156

 
128

 
171

 
133

 
175

Total investment securities held to maturity
$
1,943

 
$
2,108

 
$
2,532

 
$
2,741

 
$
2,645

 
$
2,864

Investment Securities With Unrealized Losses
 
Less than 12 months
 
12 months or more
 
Total
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
September 30, 2011
 
 
 
 
 
 
 
 
 
 
 
Investment securities available for sale:
 
 
 
 
 
 
 
 
 
 
 
Government agency
$
1,051,017

 
$
2,435

 
$
—

 
$
—

 
$
1,051,017

 
$
2,435

Residential mortgage-backed securities
25,390

 
148

 
1,675

 
50

 
27,065

 
198

State, county and municipal
—

 
—

 
425

 
—

 
425

 
—

Total
$
1,076,407

 
$
2,583

 
$
2,100

 
$
50

 
$
1,078,507

 
$
2,633

Investment securities held to maturity:
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage-backed securities
$
—

 
$
—

 
$
22

 
$
26

 
$
22

 
$
26

September 30, 2010
 
 
 
 
 
 
 
 
 
 
 
Investment securities available for sale:
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage-backed securities
10,364

 
88

 
535

 
22

 
10,899

 
110

Investment securities held to maturity:
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage-backed securities
$
—

 
$
—

 
$
27

 
$
26

 
$
27

 
$
26

Securities Gains (Losses)
 
Three months ended September 30,
 
Nine months ended September 30,
 
2011
 
2010
 
2011
 
2010
Gross gains on sales of investment securities available for sale
$
375

 
$
1,167

 
$
531

 
$
3,803

Gross losses on sales of investment securities available for sale
(95
)
 
(1
)
 
(796
)
 
(1,506
)
Other that temporary impairment loss on equity securities
(26
)
 
(226
)
 
(26
)
 
(412
)
Total securities gains (losses)
$
254

 
$
940

 
$
(291
)
 
$
1,885