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INVESTMENTS (Tables)
 3 Months Ended
Mar. 31, 2015
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 March 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

 
$
97

 
$
2

 
$
0

 
$
99

Securities of U.S. government agencies and corporations
 
17,041

 
209

 
0

 
17,250

 
11,318

 
186

 
0

 
11,504

Mortgage-backed securities
 
774,331

 
14,934

 
(482
)
 
788,783

 
588,766

 
5,419

 
(8,615
)
 
585,570

Obligations of state and other political subdivisions
 
43,495

 
955

 
(250
)
 
44,200

 
85,401

 
2,376

 
(1,018
)
 
86,759

Asset-backed securities
 
0

 
0

 
0

 
0

 
125,338

 
304

 
(181
)
 
125,461

Other securities
 
4,799

 
51

 
0

 
4,850

 
82,203

 
1,449

 
(876
)
 
82,776

Total
 
$
839,666

 
$
16,149

 
$
(732
)
 
$
855,083

 
$
893,123

 
$
9,736

 
$
(10,690
)
 
$
892,169


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
(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

 
$
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
The following table provides a summary of investment securities by estimated weighted average life as of March 31, 2015. 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
$
5,426

 
$
5,545

 
$
25,034

 
$
25,125

Due after one year through five years
360,042

 
364,027

 
365,068

 
367,463

Due after five years through ten years
244,118

 
249,477

 
167,204

 
168,454

Due after ten years
230,080

 
236,034

 
335,817

 
331,127

Total
$
839,666

 
$
855,083

 
$
893,123

 
$
892,169
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 loss position:
 
 
March 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
 
$
0

 
$
0

 
$
0

 
$
0

 
$
0

 
$
0

Mortgage-backed securities
 
27,187

 
(47
)
 
299,124

 
(8,545
)
 
326,311

 
(8,592
)
Obligations of state and other political subdivisions
 
21,688

 
(214
)
 
23,393

 
(1,054
)
 
45,081

 
(1,268
)
Asset-backed securities
 
59,696

 
(203
)
 
0

 
0

 
59,696

 
(203
)
Other securities
 
16,094

 
(297
)
 
16,803

 
(579
)
 
32,897

 
(876
)
Total
 
$
124,665

 
$
(761
)
 
$
339,320

 
$
(10,178
)
 
$
463,985

 
$
(10,939
)

 
 
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
)