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INVESTMENTS (Tables)
 9 Months Ended
Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]  
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, 2013:
  
 
Held-to-Maturity
 
Available-for-Sale
(Dollars in thousands)
 
Amortized
Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Market
Value
 
Amortized
Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Market
Value
U.S. Treasuries
 
$
0

 
$
0

 
$
0

 
$
0

 
$
97

 
$
0

 
$
(4
)
 
$
93

Securities of U.S. government agencies and corporations
 
19,462

 
0

 
(864
)
 
18,598

 
10,266

 
0

 
(142
)
 
10,124

Mortgage-backed securities
 
637,170

 
768

 
(6,561
)
 
631,377

 
652,808

 
6,093

 
(20,818
)
 
638,083

Obligations of state and other political subdivisions
 
12,461

 
157

 
(908
)
 
11,710

 
34,005

 
31

 
(2,294
)
 
31,742

Asset-backed securities
 
0

 
0

 
0

 
0

 
67,816

 
0

 
(359
)
 
67,457

Other securities
 
0

 
0

 
0

 
0

 
110,936

 
126

 
(3,814
)
 
107,248

Total
 
$
669,093

 
$
925

 
$
(8,333
)
 
$
661,685

 
$
875,928

 
$
6,250

 
$
(27,431
)
 
$
854,747


The following is a summary of held-to-maturity and available-for-sale investment securities as of December 31, 2012:
  
 
Held-to-Maturity
 
Available-for-Sale
(Dollars in thousands)
 
Amortized
Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Market
Value
 
Amortized
Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Market
Value
Securities of U.S. government agencies and corporations
 
$
20,512

 
$
679

 
$
0

 
$
21,191

 
$
15,562

 
$
333

 
$
0

 
$
15,895

Mortgage-backed securities
 
740,891

 
8,077

 
(1,290
)
 
747,678

 
854,150

 
14,564

 
(1,485
)
 
867,229

Obligations of state and other political subdivisions
 
9,352

 
265

 
(12
)
 
9,605

 
35,913

 
169

 
(84
)
 
35,998

Asset-backed securities
 
0

 
0

 
0

 
0

 
57,000

 
90

 
(1
)
 
57,089

Other securities
 
0

 
0

 
0

 
0

 
54,479

 
1,569

 
(163
)
 
55,885

Total
 
$
770,755

 
$
9,021

 
$
(1,302
)
 
$
778,474

 
$
1,017,104

 
$
16,725

 
$
(1,733
)
 
$
1,032,096
Summary of Investment Securities by Estimated Maturity
The following table provides a summary of investment securities by weighted average life as of September 30, 2013. Estimated lives on certain investment securities may differ from contractual maturities as issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
 
Held-to-Maturity
 
Available-for-Sale
(Dollars in thousands)
Amortized
Cost
 
Market
Value
 
Amortized
Cost
 
Market
Value
Due in one year or less
$
215

 
$
218

 
$
5,009

 
$
5,152

Due after one year through five years
409,559

 
407,787

 
250,089

 
251,177

Due after five years through ten years
258,526

 
252,762

 
361,949

 
351,776

Due after ten years
793

 
918

 
258,881

 
246,642

Total
$
669,093

 
$
661,685

 
$
875,928

 
$
854,747
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, 2013
 
 
Less than 12 Months
 
12 Months or More
 
Total
(Dollars in thousands)
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
Securities of U.S. government agencies and corporations
 
$
28,806

 
$
(756
)
 
$
0

 
$
0

 
$
28,806

 
$
(756
)
Mortgage-backed securities
 
807,599

 
(24,767
)
 
41,679

 
(261
)
 
849,278

 
(25,028
)
Obligations of state and other political subdivisions
 
64,895

 
(4,357
)
 
0

 
0

 
64,895

 
(4,357
)
Asset-backed securities
 
59,003

 
(359
)
 
0

 
0

 
59,003

 
(359
)
Other securities
 
72,326

 
(2,531
)
 
1,244

 
(129
)
 
73,570

 
(2,660
)
Total
 
$
1,032,629

 
$
(32,770
)
 
$
42,923

 
$
(390
)
 
$
1,075,552

 
$
(33,160
)

 
 
December 31, 2012
 
 
Less than 12 Months
 
12 Months or More
 
Total
 
 
Fair
 
Unrealized
 
Fair
 
Unrealized
 
Fair
 
Unrealized
(Dollars in thousands)
 
Value
 
Loss
 
Value
 
Loss
 
Value
 
Loss
Mortgage-backed securities
 
$
240,641

 
$
(1,635
)
 
$
25,513

 
$
(405
)
 
$
266,154

 
$
(2,040
)
Obligations of state and other political subdivisions
 
21,341

 
(96
)
 
0

 
0

 
21,341

 
(96
)
Asset-backed securities
 
9,999

 
(1
)
 
0

 
0

 
9,999

 
(1
)
Other securities
 
8,454

 
(163
)
 
0

 
0

 
8,454

 
(163
)
Total
 
$
280,435

 
$
(1,895
)
 
$
25,513

 
$
(405
)
 
$
305,948

 
$
(2,300
)