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INVESTMENTS (Tables)
 9 Months Ended
Sep. 30, 2014
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, 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

 
$
(3
)
 
$
94

Securities of U.S. government agencies and corporations
 
17,917

 
0

 
(231
)
 
17,686

 
12,304

 
3

 
(37
)
 
12,270

Mortgage-backed securities
 
832,728

 
5,290

 
(4,656
)
 
833,362

 
700,167

 
4,967

 
(19,273
)
 
685,861

Obligations of state and other political subdivisions
 
26,308

 
442

 
(418
)
 
26,332

 
49,824

 
588

 
(1,008
)
 
49,404

Asset-backed securities
 
0

 
0

 
0

 
0

 
76,693

 
244

 
(1
)
 
76,936

Other securities
 
23,568

 
770

 
(59
)
 
24,279

 
105,132

 
1,576

 
(1,679
)
 
105,029

Total
 
$
900,521

 
$
6,502

 
$
(5,364
)
 
$
901,659

 
$
944,217

 
$
7,378

 
$
(22,001
)
 
$
929,594


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

 
$
(7
)
 
$
90

Securities of U.S. government agencies and corporations
 
18,981

 
0

 
(791
)
 
18,190

 
9,980

 
0

 
(404
)
 
9,576

Mortgage-backed securities
 
775,025

 
1,337

 
(12,229
)
 
764,133

 
678,267

 
5,372

 
(28,593
)
 
655,046

Obligations of state and other political subdivisions
 
25,788

 
152

 
(1,039
)
 
24,901

 
33,410

 
10

 
(3,097
)
 
30,323

Asset-backed securities
 
0

 
0

 
0

 
0

 
114,209

 
1

 
(616
)
 
113,594

Other securities
 
17,478

 
283

 
0

 
17,761

 
109,089

 
262

 
(4,379
)
 
104,972

Total
 
$
837,272

 
$
1,772

 
$
(14,059
)
 
$
824,985

 
$
945,052

 
$
5,645

 
$
(37,096
)
 
$
913,601
Summary of Investment Securities by Estimated Maturity
The following table provides a summary of investment securities by estimated weighted average life as of September 30, 2014. 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
$
268

 
$
271

 
$
12,735

 
$
12,738

Due after one year through five years
402,027

 
401,829

 
348,661

 
346,665

Due after five years through ten years
354,896

 
355,179

 
266,513

 
260,869

Due after ten years
143,330

 
144,380

 
316,308

 
309,322

Total
$
900,521

 
$
901,659

 
$
944,217

 
$
929,594
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:
 
 
September 30, 2014
 
 
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
 
$
1,470

 
$
(5
)
 
$
17,944

 
$
(126
)
 
$
19,414

 
$
(131
)
Mortgage-backed securities
 
252,959

 
(2,616
)
 
496,254

 
(20,077
)
 
749,213

 
(22,693
)
Obligations of state and other political subdivisions
 
14,267

 
(174
)
 
38,578

 
(1,323
)
 
52,845

 
(1,497
)
Asset-backed securities
 
10,510

 
(1
)
 
0

 
0

 
10,510

 
(1
)
Other securities
 
9,254

 
(93
)
 
30,440

 
(1,304
)
 
39,694

 
(1,397
)
Total
 
$
288,460

 
$
(2,889
)
 
$
583,216

 
$
(22,830
)
 
$
871,676

 
$
(25,719
)

 
 
December 31, 2013
 
 
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
 
$
27,851

 
$
(970
)
 
$
0

 
$
0

 
$
27,851

 
$
(970
)
Mortgage-backed securities
 
966,718

 
(32,432
)
 
108,929

 
(6,101
)
 
1,075,647

 
(38,533
)
Obligations of state and other political subdivisions
 
66,502

 
(5,294
)
 
1,935

 
(46
)
 
68,437

 
(5,340
)
Asset-backed securities
 
93,355

 
(616
)
 
0

 
0

 
93,355

 
(616
)
Other securities
 
54,866

 
(2,142
)
 
7,798

 
(561
)
 
62,664

 
(2,703
)
Total
 
$
1,209,292

 
$
(41,454
)
 
$
118,662

 
$
(6,708
)
 
$
1,327,954

 
$
(48,162
)