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INVESTMENTS (Tables)
9 Months Ended
Sep. 30, 2011
Summary of Held-To-Maturity and Available-For-Sale Investment Securities
The following is a summary of held-to-maturity and available-for-sale investment securities as of September 30, 2011.

  
 
Held-to-Maturity
 
Available-for-Sale
(Dollars in thousands)
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Market
Value
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Market
Value
Securities of U.S. government agencies and corporations
 
$
0

 
$
0

 
$
0

 
$
0

 
$
5,027

 
$
85

 
$
0

 
$
5,112

Mortgage-backed securities
 
95

 
3

 
0

 
98

 
1,065,948

 
27,503

 
(267
)
 
1,093,184

Obligations of state and other political subdivisions
 
2,629

 
226

 
0

 
2,855

 
11,509

 
154

 
(26
)
 
11,637

Other securities
 
0

 
0

 
0

 
0

 
10,164

 
307

 
(225
)
 
10,246

Total
 
$
2,724

 
$
229

 
$
0

 
$
2,953

 
$
1,092,648

 
$
28,049

 
$
(518
)
 
$
1,120,179


The following is a summary of held-to-maturity and available-for-sale investment securities as of December 31, 2010.

  
 
Held-to-Maturity
 
Available-for-Sale
 
 
Amortized
 
Unrealized
 
Unrealized
 
Market
 
Amortized
 
Unrealized
 
Unrealized
 
Market
(Dollars in thousands)
 
Cost
 
Gains
 
Losses
 
Value
 
Cost
 
Gains
 
Losses
 
Value
U.S. Treasuries
 
$
13,959

 
$
390

 
$
(18
)
 
$
14,331

 
$
0

 
$
0

 
$
0

 
$
0

Securities of U.S. government agencies and corporations
 
0

 
0

 
0

 
0

 
105,028

 
957

 
0

 
105,985

Mortgage-backed securities
 
118

 
4

 
0

 
122

 
775,867

 
15,513

 
(2,630
)
 
788,750

Obligations of state and other political subdivisions
 
3,329

 
284

 
0

 
3,613

 
13,708

 
207

 
(91
)
 
13,824

Other securities
 
0

 
0

 
0

 
0

 
9,943

 
614

 
(6
)
 
10,551

Total
 
$
17,406

 
$
678

 
$
(18
)
 
$
18,066

 
$
904,546

 
$
17,291

 
$
(2,727
)
 
$
919,110

Summary of Investment Securities by Estimated Maturity
The following is a summary of investment securities by estimated maturity as of September 30, 2011.

 
Held-to-Maturity
 
Available-for-Sale
 
Amortized
Cost
 
Market
Value
 
Amortized
Cost
 
Market
Value
Due in one year or less
$
292

 
$
296

 
$
24,616

 
$
24,889

Due after one year through five years
1,370

 
1,442

 
933,066

 
955,663

Due after five years through ten years
211

 
245

 
82,340

 
85,706

Due after ten years
851

 
970

 
52,626

 
53,921

Total
$
2,724

 
$
2,953

 
$
1,092,648

 
$
1,120,179

Age of Gross Unrealized Losses and Associated Fair Value by Investment Category
The following tables present the age of gross unrealized losses and associated fair value by investment category.

 
 
September 30, 2011
 
 
Less than 12 Months
 
12 Months or More
 
Total
(Dollars in thousands)
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
Mortgage-backed securities
 
$
114,524

 
$
(204
)
 
$
1,340

 
$
(63
)
 
$
115,864

 
$
(267
)
Obligations of state and other political subdivisions
 
0

 
0

 
2,257

 
(26
)
 
2,257

 
(26
)
Other securities
 
0

 
0

 
2,146

 
(225
)
 
2,146

 
(225
)
Total
 
$
114,524

 
$
(204
)
 
$
5,743

 
$
(314
)
 
$
120,267

 
$
(518
)

 
 
December 31, 2010
 
 
Less than 12 Months
 
12 Months or More
 
Total
 
 
Fair
 
Unrealized
 
Fair
 
Unrealized
 
Fair
 
Unrealized
(Dollars in thousands)
 
Value
 
Loss
 
Value
 
Loss
 
Value
 
Loss
U.S. Treasuries
 
$
2,334

 
$
(18
)
 
$
0

 
$
0

 
$
2,334

 
$
(18
)
Mortgage-backed securities
 
280,445

 
(2,538
)
 
1,336

 
(92
)
 
281,781

 
(2,630
)
Obligations of state and other political subdivisions
 
0

 
0

 
2,194

 
(91
)
 
2,194

 
(91
)
Other securities
 
2,217

 
(6
)
 
17

 
0

 
2,234

 
(6
)
Total
 
$
284,996

 
$
(2,562
)
 
$
3,547

 
$
(183
)
 
$
288,543

 
$
(2,745
)