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INVESTMENTS (Tables)
 12 Months Ended
Dec. 31, 2015
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 December 31, 2015:
  
 
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

 
$
98

 
$
0

 
$
(1
)
 
$
97

Securities of U.S. government agencies and corporations
 
15,486

 
121

 
0

 
15,607

 
8,183

 
157

 
0

 
8,340

Mortgage-backed securities
 
678,318

 
7,452

 
(1,999
)
 
683,771

 
775,285

 
2,708

 
(12,926
)
 
765,067

Obligations of state and other political subdivisions
 
27,646

 
338

 
(99
)
 
27,885

 
73,815

 
2,491

 
(671
)
 
75,635

Asset-backed securities
 
0

 
0

 
0

 
0

 
236,411

 
35

 
(3,445
)
 
233,001

Other securities
 
4,809

 
0

 
(121
)
 
4,688

 
109,273

 
687

 
(1,458
)
 
108,502

Total
 
$
726,259

 
$
7,911

 
$
(2,219
)
 
$
731,951

 
$
1,203,065

 
$
6,078

 
$
(18,501
)
 
$
1,190,642


The following is a summary of held-to-maturity and available-for-sale investment securities as of December 31, 2014:
  
 
Held-to-maturity
 
Available-for-sale
 
 
Amortized
 
Unrealized
 
Unrealized
 
Market
 
Amortized
 
Unrealized
 
Unrealized
 
Market
(Dollars in thousands)
 
cost
 
gain
 
loss
 
value
 
cost
 
gain
 
loss
 
value
U.S. Treasuries
 
$
0

 
$
0

 
$
0

 
$
0

 
$
97

 
$
0

 
$
0

 
$
97

Securities of U.S. government agencies and corporations
 
17,570

 
24

 
(23
)
 
17,571

 
11,814

 
67

 
(1
)
 
11,880

Mortgage-backed securities
 
801,465

 
7,813

 
(2,064
)
 
807,214

 
611,497

 
4,462

 
(13,211
)
 
602,748

Obligations of state and other political subdivisions
 
44,164

 
1,275

 
(193
)
 
45,246

 
73,649

 
883

 
(947
)
 
73,585

Asset-backed securities
 
0

 
0

 
0

 
0

 
74,784

 
155

 
(103
)
 
74,836

Other securities
 
4,797

 
0

 
(79
)
 
4,718

 
77,663

 
1,193

 
(1,534
)
 
77,322

Total
 
$
867,996

 
$
9,112

 
$
(2,359
)
 
$
874,749

 
$
849,504

 
$
6,760

 
$
(15,796
)
 
$
840,468
Summary of Investment Securities by Estimated Maturity

 
Held-to-maturity
 
Available-for-sale
(Dollars in thousands)
Amortized
cost
 
Market
value
 
Amortized
cost
 
Market
value
Due in one year or less
$
4,061

 
$
4,148

 
$
21,724

 
$
21,652

Due after one year through five years
536,660

 
540,266

 
748,300

 
740,460

Due after five years through ten years
185,538

 
187,537

 
393,652

 
389,001

Due after ten years
0

 
0

 
39,389

 
39,529

Total
$
726,259

 
$
731,951

 
$
1,203,065

 
$
1,190,642
Age of Gross Unrealized Losses and Associated Fair Value by Investment Category
The following tables provide the fair value and gross unrealized losses on investment securities in an unrealized loss position, aggregated by investment category and the length of time the individual securities have been in a continuous unrealized loss position:
 
 
December 31, 2015
 
 
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
 
$
97

 
$
0

 
$
0

 
$
0

 
$
97

 
$
0

Mortgage-backed securities
 
500,768

 
(5,363
)
 
246,523

 
(9,563
)
 
747,291

 
(14,926
)
Obligations of state and other political subdivisions
 
972

 
(6
)
 
29,287

 
(764
)
 
30,259

 
(770
)
Asset-backed securities
 
189,066

 
(3,042
)
 
17,144

 
(403
)
 
206,210

 
(3,445
)
Other securities
 
35,656

 
(651
)
 
24,716

 
(928
)
 
60,372

 
(1,579
)
Total
 
$
726,559

 
$
(9,062
)
 
$
317,670

 
$
(11,658
)
 
$
1,044,229

 
$
(20,720
)

 
 
December 31, 2014
 
 
Less than 12 months
 
12 months or more
 
Total
 
 
Fair
 
Unrealized
 
Fair
 
Unrealized
 
Fair
 
Unrealized
(Dollars in thousands)
 
value
 
loss
 
value
 
loss
 
value
 
loss
Securities of U.S. government agencies and corporations
 
$
493

 
$
(1
)
 
$
97

 
$
0

 
$
590

 
$
(1
)
Mortgage-backed securities
 
119,641

 
(420
)
 
428,486

 
(13,780
)
 
548,127

 
(14,200
)
Obligations of state and other political subdivisions
 
12,746

 
(126
)
 
37,516

 
(1,014
)
 
50,262

 
(1,140
)
Asset-backed securities
 
32,045

 
(103
)
 
0

 
0

 
32,045

 
(103
)
Other securities
 
12,831

 
(317
)
 
30,005

 
(1,296
)
 
42,836

 
(1,613
)
Total
 
$
177,756

 
$
(967
)
 
$
496,104

 
$
(16,090
)
 
$
673,860

 
$
(17,057
)