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INVESTMENTS (Tables)
 6 Months Ended
Jun. 30, 2017
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 June 30, 2017:
  
 
Held-to-maturity
 
Available-for-sale
(Dollars in thousands)
 
Amortized
cost
 
Unrecognized gain
 
Unrecognized loss
 
Fair
value
 
Amortized
cost
 
Unrealized
gain
 
Unrealized
loss
 
Fair
value
U.S. Treasuries
 
$
0

 
$
0

 
$
0

 
$
0

 
$
98

 
$
0

 
$
0

 
$
98

Securities of U.S. government agencies and corporations
 
12,130

 
28

 
(17
)
 
12,141

 
16,967

 
159

 
0

 
17,126

Mortgage-backed securities - residential
 
181,553

 
1,996

 
(1,338
)
 
182,211

 
262,052

 
1,140

 
(2,019
)
 
261,173

Mortgage-backed securities - commercial
 
261,739

 
3,156

 
(1,912
)
 
262,983

 
157,138

 
682

 
(412
)
 
157,408

Collateralized mortgage obligations
 
165,625

 
1,138

 
(1,083
)
 
165,680

 
324,712

 
1,289

 
(1,609
)
 
324,392

Obligations of state and other political subdivisions
 
75,222

 
884

 
(399
)
 
75,707

 
122,511

 
2,206

 
(889
)
 
123,828

Asset-backed securities
 
0

 
0

 
0

 
0

 
327,564

 
1,717

 
(504
)
 
328,777

Other securities
 
0

 
0

 
0

 
0

 
84,335

 
1,748

 
(307
)
 
85,776

Total
 
$
696,269

 
$
7,202

 
$
(4,749
)
 
$
698,722

 
$
1,295,377

 
$
8,941

 
$
(5,740
)
 
$
1,298,578


The following is a summary of held-to-maturity and available-for-sale investment securities as of December 31, 2016:
  
 
Held-to-maturity
 
Available-for-sale
(Dollars in thousands)
 
Amortized
cost
 
Unrecognized gain
 
Unrecognized
loss
 
Fair
value
 
Amortized
cost
 
Unrealized
gain
 
Unrealized
loss
 
Fair
value
U.S. Treasuries
 
$
0

 
$
0

 
$
0

 
$
0

 
$
98

 
$
0

 
$
(1
)
 
$
97

Securities of U.S. government agencies and corporations
 
13,011

 
0

 
(110
)
 
12,901

 
7,056

 
0

 
(40
)
 
7,016

Mortgage-backed securities - residential
 
205,522

 
1,740

 
(1,166
)
 
206,096

 
184,960

 
1,175

 
(2,740
)
 
183,395

Mortgage-backed securities - commercial
 
278,728

 
3,254

 
(1,817
)
 
280,165

 
154,239

 
188

 
(826
)
 
153,601

Collateralized mortgage obligations
 
195,408

 
1,125

 
(1,476
)
 
195,057

 
232,701

 
634

 
(2,321
)
 
231,014

Obligations of state and other political subdivisions
 
70,585

 
117

 
(1,346
)
 
69,356

 
96,934

 
1,461

 
(1,514
)
 
96,881

Asset-backed securities
 
0

 
0

 
0

 
0

 
322,708

 
517

 
(2,013
)
 
321,212

Other securities
 
0

 
0

 
0

 
0

 
46,641

 
741

 
(728
)
 
46,654

Total
 
$
763,254

 
$
6,236

 
$
(5,915
)
 
$
763,575

 
$
1,045,337

 
$
4,716

 
$
(10,183
)
 
$
1,039,870
Summary of Investment Securities by Estimated Maturity
The following table provides a summary of investment securities by contractual maturity as of June 30, 2017, except for residential and commercial mortgage-backed securities, collateralized mortgage obligations and asset-backed securities, which are shown as single totals, due to the unpredictability of the timing in principal repayments.
 
Held-to-maturity
 
Available-for-sale
(Dollars in thousands)
Amortized
cost
 
Fair
value
 
Amortized
cost
 
Fair
value
By Contractual Maturity:
 
 
 
 
 
 
 
Due in one year or less
$
170

 
$
170

 
$
2,236

 
$
2,238

Due after one year through five years
3,657

 
3,660

 
25,504

 
25,743

Due after five years through ten years
2,691

 
2,790

 
73,547

 
75,012

Due after ten years
80,834

 
81,228

 
122,624

 
123,835

Mortgage-backed securities - residential
181,553

 
182,211

 
262,052

 
261,173

Mortgage-backed securities - commercial
261,739

 
262,983

 
157,138

 
157,408

Collateralized mortgage obligations
165,625

 
165,680

 
324,712

 
324,392

Asset-backed securities
0

 
0

 
327,564

 
328,777

Total
$
696,269

 
$
698,722

 
$
1,295,377

 
$
1,298,578
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:
 
 
June 30, 2017
 
 
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
 
$
6,281

 
$
(17
)
 
$
0

 
$
0

 
$
6,281

 
$
(17
)
Mortgage-backed securities - residential
 
201,854

 
(3,077
)
 
9,021

 
(280
)
 
210,875

 
(3,357
)
Mortgage-backed securities - commercial
 
94,052

 
(1,059
)
 
60,816

 
(1,265
)
 
154,868

 
(2,324
)
Collateralized mortgage obligations
 
193,840

 
(1,454
)
 
45,729

 
(1,238
)
 
239,569

 
(2,692
)
Obligations of state and other political subdivisions
 
79,823

 
(1,006
)
 
14,664

 
(282
)
 
94,487

 
(1,288
)
Asset-backed securities
 
14,147

 
(89
)
 
30,621

 
(415
)
 
44,768

 
(504
)
Other securities
 
10,680

 
(134
)
 
2,472

 
(173
)
 
13,152

 
(307
)
Total
 
$
600,677

 
$
(6,836
)
 
$
163,323

 
$
(3,653
)
 
$
764,000

 
$
(10,489
)

 
 
December 31, 2016
 
 
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
 
$
97

 
$
(1
)
 
$
0

 
$
0

 
$
97

 
$
(1
)
Securities of U.S. Government agencies and corporations
 
19,917

 
(150
)
 
0

 
0

 
19,917

 
(150
)
Mortgage-backed securities - residential
 
180,654

 
(3,621
)
 
9,890

 
(285
)
 
190,544

 
(3,906
)
Mortgage-backed securities - commercial
 
123,122

 
(1,200
)
 
65,007

 
(1,443
)
 
188,129

 
(2,643
)
Collateralized mortgage obligations
 
201,305

 
(2,882
)
 
42,314

 
(915
)
 
243,619

 
(3,797
)
Obligations of state and other political subdivisions
 
94,632

 
(2,710
)
 
12,023

 
(150
)
 
106,655

 
(2,860
)
Asset-backed securities
 
116,057

 
(764
)
 
92,629

 
(1,249
)
 
208,686

 
(2,013
)
Other securities
 
7,746

 
(237
)
 
21,357

 
(491
)
 
29,103

 
(728
)
Total
 
$
743,530

 
$
(11,565
)
 
$
243,220

 
$
(4,533
)
 
$
986,750

 
$
(16,098
)