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INVESTMENT SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2011
Investments [Abstract]  
Aggregate Values And Unrealized Gains And Losses Of Investment Securities
The aggregate values of investment securities at December 31, 2011 and 2010 along with gains and losses determined on an individual security basis are as follows:
 
 
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Investment securities available for sale
 
 
 
 
 
 
 
2011
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury
$
887,041

 
$
808

 
$
30

 
$
887,819

 
 
Government agency
2,591,974

 
1,747

 
1,512

 
2,592,209

 
 
Corporate bonds
250,476

 
2,344

 
—

 
252,820

 
 
Residential mortgage-backed securities
298,402

 
9,165

 
346

 
307,221

 
 
Equity securities
939

 
14,374

 
—

 
15,313

 
 
State, county and municipal
1,026

 
16

 
1

 
1,041

 
 
Total investment securities available for sale
$
4,029,858

 
$
28,454

 
$
1,889

 
$
4,056,423

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

Investment securities held to maturity
 
 
 
 
 
 
 
2011
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage-backed securities
$
1,822

 
$
184

 
26

 
$
1,980

2010
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage-backed securities
$
2,532

 
$
235

 
26

 
$
2,741
Investment Securities Maturity Information
The following table provides maturity information for investment securities as of December 31, 2011 and 2010. Callable securities are assumed to mature on their earliest call date.
 
 
2011
 
2010
 
Cost
 
Fair Value
 
Cost
 
Fair Value
Investment securities available for sale
 
 
 
 
 
 
 
Maturing in:
 
 
 
 
 
 
 
One year or less
$
3,238,657

 
$
3,241,415

 
$
3,441,185

 
$
3,436,818

One through five years
548,459

 
549,351

 
916,101

 
921,536

Five through 10 years
90,605

 
91,087

 
1,683

 
1,710

Over 10 years
151,198

 
159,257

 
126,857

 
130,781

Equity securities
939

 
15,313

 
1,055

 
19,231

Total investment securities available for sale
$
4,029,858

 
$
4,056,423

 
$
4,486,881

 
$
4,510,076

Investment securities held to maturity
 
 
 
 
 
 
 
Maturing in:
 
 
 
 
 
 
 
One through five years
$
12

 
$
11

 
$
—

 
$
—

Five through 10 years
1,699

 
1,820

 
2,404

 
2,570

Over 10 years
111

 
149

 
128

 
171

Total investment securities held to maturity
$
1,822

 
$
1,980

 
$
2,532

 
$
2,741
Securities Gains (Losses)
For each period presented, securities gains (losses) include the following:
 
2011
 
2010
 
2009
Gross gains on sales of investment securities available for sale
$
531

 
$
4,103

 
$
104

Gross losses on sales of investment securities available for sale
(793
)
 
(1,730
)
 
—

Other than temporary impairment losses on equity investments
(26
)
 
(421
)
 
(615
)
Total securities gains (losses)
$
(288
)
 
$
1,952

 
$
(511
)
Investment Securities With Unrealized Losses
The following table provides information regarding securities with unrealized losses as of December 31, 2011 and 2010:
 
 
Less than 12 months
 
12 months or more
 
Total
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
December 31, 2011
 
 
 
 
 
 
 
 
 
 
 
Investment securities available for sale:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury
$
151,269

 
$
30

 
$
—

 
$
—

 
$
151,269

 
$
30

Government agency
1,336,763

 
1,512

 
—

 
—

 
1,336,763

 
1,512

Residential mortgage-backed securities
59,458

 
304

 
1,380

 
42

 
60,838

 
346

State, county and municipal
—

 
—

 
10

 
1

 
10

 
1

Total
$
1,547,490

 
$
1,846

 
$
1,390

 
$
43

 
$
1,548,880

 
$
1,889

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

 
$
—

 
$
21

 
$
26

 
$
21

 
$
26

Total
$
—

 
$
—

 
$
21

 
$
26

 
$
21

 
$
26

December 31, 2010
 
 
 
 
 
 
 
 
 
 
 
Investment securities available for sale:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury
$
301,190

 
$
307

 
$
—

 
$
—

 
$
301,190

 
$
307

Government agency
1,684,149

 
10,843

 
—

 
—

 
1,684,149

 
10,843

Residential mortgage-backed securities
11,496

 
249

 
523

 
20

 
12,019

 
269

State, county and municipal
530

 
4

 
20

 
—

 
550

 
4

Total
$
1,997,365

 
$
11,403

 
$
543

 
$
20

 
$
1,997,908

 
$
11,423

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

 
$
—

 
$
26

 
$
26

 
$
26

 
$
26

Total
$
—

 
$
—

 
$
26

 
$
26

 
$
26

 
$
26