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INVESTMENTS
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
INVESTMENTS
Investment Securities

The following is a summary of HTM and AFS investment securities as of December 31, 2018:
  
 
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

 
$
99

 
$
0

 
$
(2
)
 
$
97

Securities of U.S. government agencies and corporations
 
0

 
0

 
0

 
0

 
32,095

 
57

 
(233
)
 
31,919

Mortgage-backed securities - residential
 
25,565

 
0

 
(1,045
)
 
24,520

 
565,071

 
691

 
(7,163
)
 
558,599

Mortgage-backed securities - commercial
 
147,780

 
258

 
(4,385
)
 
143,653

 
423,797

 
819

 
(3,581
)
 
421,035

Collateralized mortgage obligations
 
12,540

 
0

 
(633
)
 
11,907

 
928,586

 
4,319

 
(6,158
)
 
926,747

Obligations of state and other political subdivisions
 
243,443

 
1,954

 
(1,359
)
 
244,038

 
257,300

 
2,554

 
(1,429
)
 
258,425

Asset-backed securities
 
0

 
0

 
0

 
0

 
511,430

 
611

 
(2,810
)
 
509,231

Other securities
 
0

 
0

 
0

 
0

 
73,948

 
358

 
(1,104
)
 
73,202

Total
 
$
429,328

 
$
2,212

 
$
(7,422
)
 
$
424,118

 
$
2,792,326

 
$
9,409

 
$
(22,480
)
 
$
2,779,255


The following is a summary of HTM and AFS investment securities as of December 31, 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

 
$
(1
)
 
$
97

Securities of U.S. government agencies and corporations
 
11,168

 
0

 
(76
)
 
11,092

 
15,695

 
220

 
0

 
15,915

Mortgage-backed securities - residential
 
162,093

 
2,042

 
(1,535
)
 
162,600

 
290,793

 
849

 
(2,599
)
 
289,043

Mortgage-backed securities - commercial
 
255,027

 
1,372

 
(3,000
)
 
253,399

 
150,356

 
164

 
(1,417
)
 
149,103

Collateralized mortgage obligations
 
143,545

 
354

 
(1,602
)
 
142,297

 
306,095

 
1,158

 
(1,861
)
 
305,392

Obligations of state and other political subdivisions
 
82,175

 
1,804

 
(266
)
 
83,713

 
124,269

 
2,162

 
(676
)
 
125,755

Asset-backed securities
 
0

 
0

 
0

 
0

 
377,655

 
1,628

 
(306
)
 
378,977

Other securities
 
0

 
0

 
0

 
0

 
83,266

 
2,147

 
(287
)
 
85,126

Total
 
$
654,008

 
$
5,572

 
$
(6,479
)
 
$
653,101

 
$
1,348,227

 
$
8,328

 
$
(7,147
)
 
$
1,349,408



During the year ended December 31, 2018, proceeds on the sale of $290.7 million of AFS securities resulted in gains of $0.5 million and losses of $0.6 million, with insignificant tax expense. During the year ended December 31, 2017, proceeds on the sale of $190.0 million of AFS securities resulted in gains of $1.8 million and losses of $0.2 million and tax expense of $0.6 million. During the year ended December 31, 2016, proceeds on the sale of $207.0 million of AFS securities resulted in gains of $1.2 million and losses of $1.0 million and tax expense of $0.1 million. In addition to the sale of certain securities, First Financial reclassified $372.1 million of HTM securities to AFS to align with post-merger investment strategies during the second quarter 2018.

The carrying value of investment securities pledged as collateral to secure public deposits, repurchase agreements and for other purposes as required by law totaled $1.2 billion at December 31, 2018 and $0.8 billion at December 31, 2017.

The following table provides a summary of investment securities by contractual maturity as of December 31, 2018, 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
Due in one year or less
 
$
0

 
$
0

 
$
5,972

 
$
5,977

Due after one year through five years
 
275

 
279

 
63,995

 
64,040

Due after five years through ten years
 
21,110

 
21,374

 
133,360

 
133,594

Due after ten years
 
222,058

 
222,385

 
160,115

 
160,032

Mortgage-backed securities - residential
 
25,565

 
24,520

 
565,071

 
558,599

Mortgage-backed securities - commercial
 
147,780

 
143,653

 
423,797

 
421,035

Collateralized mortgage obligations
 
12,540

 
11,907

 
928,586

 
926,747

Asset-backed securities
 
0

 
0

 
511,430

 
509,231

Total
 
$
429,328

 
$
424,118

 
$
2,792,326

 
$
2,779,255



Unrealized gains and losses on debt securities are generally due to fluctuations in current market yields relative to the yields of the securities at their amortized cost.  All securities with unrealized losses are reviewed quarterly to determine if any impairment is considered other than temporary, requiring a write-down to fair value. First Financial considers the percentage loss on a security, duration of the loss, average life or duration of the security, credit rating of the security and payment performance, in addition to the Company’s intent and ability to hold the security to maturity, when determining whether any impairment is other than temporary. At this time First Financial does not intend to sell, and it is not more likely than not that the Company will be required to sell, debt securities temporarily impaired prior to maturity or recovery of the recorded value. First Financial had no other than temporary impairment related to its investment securities portfolio as of December 31, 2018 or 2017.

As of December 31, 2018, the Company's investment securities portfolio consisted of 1,417 securities, of which 504 securities were in an unrealized loss position. As of December 31, 2017, the Company's investment securities portfolio consisted of 775 securities, of which 237 were in an unrealized loss position.

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:
 
 
December 31, 2018
 
 
Less than 12 months
 
12 months or more
 
Total
(Dollars in thousands)
 
Fair
value
 
Unrealized
loss
 
Fair
value
 
Unrealized
loss
 
Fair
value
 
Unrealized
loss
U.S. Treasuries
 
$
0

 
$
0

 
$
97

 
$
(2
)
 
$
97

 
$
(2
)
Securities of U.S. government agencies and corporations
 
0

 
0

 
16,777

 
(233
)
 
16,777

 
(233
)
Mortgage-backed securities - residential
 
186,029

 
(935
)
 
264,795

 
(7,273
)
 
450,824

 
(8,208
)
Mortgage-backed securities - commercial
 
147,754

 
(369
)
 
232,363

 
(7,597
)
 
380,117

 
(7,966
)
Collateralized mortgage obligations
 
194,795

 
(1,546
)
 
240,514

 
(5,245
)
 
435,309

 
(6,791
)
Obligations of state and other political subdivisions
 
62,805

 
(299
)
 
86,644

 
(2,489
)
 
149,449

 
(2,788
)
Asset-backed securities
 
336,437

 
(2,312
)
 
37,105

 
(498
)
 
373,542

 
(2,810
)
Other securities
 
33,752

 
(884
)
 
4,570

 
(220
)
 
38,322

 
(1,104
)
Total
 
$
961,572

 
$
(6,345
)
 
$
882,865

 
$
(23,557
)
 
$
1,844,437

 
$
(29,902
)

 
 
December 31, 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
U.S. Treasuries
 
$
97

 
$
(1
)
 
$
0

 
$
0

 
$
97

 
$
(1
)
Securities of U.S. Government agencies and corporations
 
11,092

 
(76
)
 
0

 
0

 
11,092

 
(76
)
Mortgage-backed securities - residential
 
175,183

 
(1,109
)
 
108,782

 
(3,025
)
 
283,965

 
(4,134
)
Mortgage-backed securities - commercial
 
132,818

 
(1,713
)
 
72,139

 
(2,704
)
 
204,957

 
(4,417
)
Collateralized mortgage obligations
 
164,909

 
(1,138
)
 
101,436

 
(2,325
)
 
266,345

 
(3,463
)
Obligations of state and other political subdivisions
 
38,450

 
(507
)
 
21,639

 
(435
)
 
60,089

 
(942
)
Asset-backed securities
 
44,941

 
(200
)
 
24,396

 
(106
)
 
69,337

 
(306
)
Other securities
 
2,605

 
(1
)
 
7,124

 
(286
)
 
9,729

 
(287
)
Total
 
$
570,095

 
$
(4,745
)
 
$
335,516

 
$
(8,881
)
 
$
905,611

 
$
(13,626
)


For further detail on the fair value of investment securities, see Note 21 – Fair Value Disclosures.