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Investments (Tables)
 9 Months Ended
Sep. 30, 2018
Investments [Line Items]  
Schedule of Held-to-maturity Securities
September 30, 2018
 
 
 
 
 
 
 
 
 
 
 
 
($ in thousands)
 
Amortized
Cost
 
Net
 Unrealized Gains
 (Losses)
 
Carrying
Value
 
Unrecognized
 Holding
Gains
 
Unrecognized Holding
 Losses
 
Fair
Value
Obligations of states and political subdivisions
 
$
21,834

 
36

 
21,870

 
526

 
—

 
22,396

Corporate securities
 
22,798

 
(86
)
 
22,712

 
1,132

 
—

 
23,844

Total HTM fixed income securities
 
$
44,632

 
(50
)
 
44,582

 
1,658

 
—

 
46,240

December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
($ in thousands)
 
Amortized
Cost
 
Net
 Unrealized Gains
 (Losses)
 
Carrying
Value
 
Unrecognized
 Holding
Gains
 
Unrecognized Holding
 Losses
 
Fair
Value
Obligations of states and political subdivisions
 
$
25,154

 
84

 
25,238

 
1,023

 
—

 
26,261

Corporate securities
 
16,996

 
(105
)
 
16,891

 
1,003

 
(55
)
 
17,839

Total HTM fixed income securities
 
$
42,150

 
(21
)
 
42,129

 
2,026

 
(55
)
 
44,100

 
Schedule of Available-for-sale Securities
September 30, 2018
 
 
 
 
 
 
 
 
($ in thousands)
 
Cost/
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
AFS fixed income securities:
 
 
 
 
 
 
 
 
U.S. government and government agencies
 
$
97,304

 
306

 
(1,148
)
 
96,462

Foreign government
 
18,015

 
88

 
(120
)
 
17,983

Obligations of states and political subdivisions
 
1,161,322

 
10,848

 
(7,261
)
 
1,164,909

Corporate securities
 
1,662,613

 
6,342

 
(19,302
)
 
1,649,653

Collateralized loan obligations and other asset-backed securities ("CLO and other ABS")
 
772,738

 
4,571

 
(2,540
)
 
774,769

Commercial mortgage-backed securities ("CMBS")
 
495,208

 
328

 
(5,987
)
 
489,549

Residential mortgage-backed securities (“RMBS”)
 
1,009,764

 
2,670

 
(15,603
)
 
996,831

Total AFS securities
 
$
5,216,964

 
25,153

 
(51,961
)
 
5,190,156

December 31, 2017
 
 
 
 
 
 
 
 
($ in thousands)
 
Cost/
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
AFS fixed income securities:
 
 
 
 
 
 
 
 
U.S. government and government agencies
 
$
49,326

 
647

 
(233
)
 
49,740

Foreign government
 
18,040

 
526

 
(11
)
 
18,555

Obligations of states and political subdivisions
 
1,539,307

 
44,245

 
(582
)
 
1,582,970

Corporate securities
 
1,588,339

 
30,891

 
(1,762
)
 
1,617,468

CLO and other ABS
 
789,152

 
6,508

 
(202
)
 
795,458

CMBS
 
382,727

 
1,563

 
(841
)
 
383,449

RMBS
 
709,825

 
6,487

 
(1,430
)
 
714,882

Total AFS fixed income securities
 
5,076,716

 
90,867

 
(5,061
)
 
5,162,522

AFS equity securities:
 
 
 
 
 
 
 
 
Common stock
 
129,696

 
38,287

 
(226
)
 
167,757

Preferred stock
 
14,115

 
904

 
(71
)
 
14,948

Total AFS equity securities
 
143,811

 
39,191

 
(297
)
 
182,705

Total AFS securities
 
$
5,220,527

 
130,058

 
(5,358
)
 
5,345,227
Schedule of Fair Value and Gross Pre-Tax Net Unrealized/Unrecognized Loss of Securities by Length of Time, AFS
September 30, 2018
 
Less than 12 months
 
12 months or longer
 
Total
($ in thousands)
 
Fair Value
 
Unrealized
Losses1
 
Fair Value
 
Unrealized
Losses1
 
Fair Value
 
Unrealized
Losses1
AFS fixed income securities:
 
 

 
 

 
 

 
 

 
 
 
 
U.S. government and government agencies
 
$
26,414

 
(843
)
 
8,497

 
(305
)
 
34,911

 
(1,148
)
Foreign government
 
7,281

 
(120
)
 
—

 
—

 
7,281

 
(120
)
Obligations of states and political subdivisions
 
411,980

 
(7,008
)
 
6,397

 
(253
)
 
418,377

 
(7,261
)
Corporate securities
 
1,140,349

 
(19,052
)
 
6,373

 
(250
)
 
1,146,722

 
(19,302
)
CLO and other ABS
 
497,809

 
(2,479
)
 
4,335

 
(61
)
 
502,144

 
(2,540
)
CMBS
 
376,359

 
(5,940
)
 
2,340

 
(47
)
 
378,699

 
(5,987
)
RMBS
 
699,336

 
(14,727
)
 
19,183

 
(876
)
 
718,519

 
(15,603
)
Total AFS securities
 
$
3,159,528

 
(50,169
)
 
47,125

 
(1,792
)
 
3,206,653

 
(51,961
)

December 31, 2017
 
Less than 12 months
 
12 months or longer
 
Total
($ in thousands)
 
Fair
Value
 
Unrealized
Losses1
 
Fair Value
 
Unrealized
Losses1
 
Fair Value
 
Unrealized
Losses1
AFS fixed income securities:
 
 

 
 

 
 

 
 

 
 
 
 
U.S. government and government agencies
 
$
23,516

 
(233
)
 
250

 
—

 
23,766

 
(233
)
Foreign government
 
1,481

 
(11
)
 
—

 
—

 
1,481

 
(11
)
Obligations of states and political subdivisions
 
107,514

 
(422
)
 
14,139

 
(160
)
 
121,653

 
(582
)
Corporate securities
 
238,326

 
(1,744
)
 
3,228

 
(18
)
 
241,554

 
(1,762
)
CLO and other ABS
 
74,977

 
(196
)
 
1,655

 
(6
)
 
76,632

 
(202
)
CMBS
 
154,267

 
(773
)
 
5,214

 
(68
)
 
159,481

 
(841
)
RMBS
 
269,485

 
(1,285
)
 
11,200

 
(145
)
 
280,685

 
(1,430
)
Total AFS fixed income securities
 
869,566

 
(4,664
)
 
35,686

 
(397
)
 
905,252

 
(5,061
)
AFS equity securities:
 
 
 
 
 
 
 
 
 
 
 
 
Common stock
 
4,727

 
(226
)
 
—

 
—

 
4,727

 
(226
)
Preferred stock
 
3,833

 
(71
)
 
—

 
—

 
3,833

 
(71
)
Total AFS equity securities
 
8,560

 
(297
)
 
—

 
—

 
8,560

 
(297
)
Total AFS
 
$
878,126

 
(4,961
)
 
35,686

 
(397
)
 
913,812

 
(5,358
)
  1 Gross unrealized losses include non-OTTI unrealized amounts and OTTI losses recognized in AOCI. 

Schedule of Fixed Maturity Securities By Contractual Maturities
 
 
AFS
 
HTM
($ in thousands)
 
Fair Value
 
Carrying Value
 
Fair Value
Due in one year or less
 
$
176,545

 
14,017

 
14,150

Due after one year through five years
 
2,107,663

 
20,518

 
21,926

Due after five years through 10 years
 
2,759,167

 
10,047

 
10,164

Due after 10 years
 
146,781

 
—

 
—

Total fixed income securities
 
$
5,190,156

 
44,582

 
46,240
Schedule of Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy
Other Investments
 
September 30, 2018
 
December 31, 2017
($ in thousands)
 
Carrying Value
 
Remaining Commitment
 
Maximum Exposure to Loss1
 
Carrying Value
 
Remaining Commitment
 
Maximum Exposure to Loss1
Alternative Investments
 
 

 
 

 
 
 
 
 
 
 
 
   Private equity
 
$
75,508

 
99,346

 
174,854

 
52,251

 
99,026

 
151,277

   Private credit
 
37,525

 
85,747

 
123,272

 
37,743

 
94,959

 
132,702

   Real assets
 
25,214

 
33,088

 
58,302

 
25,379

 
27,014

 
52,393

Total alternative investments
 
138,247

 
218,181

 
356,428

 
115,373

 
220,999

 
336,372

Other securities
 
25,683

 
—

 
25,683

 
16,895

 
—

 
16,895

Total other investments
 
$
163,930

 
218,181

 
382,111

 
132,268

 
220,999

 
353,267


1The maximum exposure to loss includes both the carry value of these investments and the related unfunded commitments. In addition, tax credits that have been previously recognized in Other securities are subject to the risk of recapture, which we do not consider significant. 
Schedule of Aggregated Summarized Income Statement Financial Information For Partnerships In Our Alternative Investment Portfolio
Income Statement Information
 
Quarter ended September 30,
 
Nine Months ended September 30,
($ in millions)
 
2018
 
2017
 
2018
 
2017
Net investment income (loss)
 
$
11.9


0.6

 
(29.9
)
 
(61.8
)
Realized gains (losses)
 
124.8


43.3

 
1,348.3

 
(261.0
)
Net change in unrealized appreciation
 
1,434.3


1,296.3

 
695.8

 
3,186.3

Net gain
 
$
1,571.0


1,340.2

 
2,014.2

 
2,863.5

Selective’s insurance subsidiaries’ alternative investments gain
 
$
7.1

 
2.7

 
10.6

 
9.5


 
Schedule of Securities Pledged As Collateral
($ in millions)
 
FHLBI Collateral
 
FHLBNY Collateral
 
State and Regulatory Deposits
 
Total
U.S. government and government agencies
 
$
—

 
—

 
22.2

 
22.2

Obligations of states and political subdivisions
 
—

 
—

 
3.8

 
3.8

CMBS
 
7.2

 
9.4

 
—

 
16.6

RMBS
 
57.8

 
76.3

 
—

 
134.1

Total pledged as collateral
 
$
65.0

 
85.7

 
26.0


176.7
Schedule of Pre-Tax Net Investment Income Earned
 
 
Quarter ended September 30,
 
Nine Months ended September 30,
($ in thousands)
 
2018
 
2017
 
2018
 
2017
Fixed income securities
 
$
45,088


38,865

 
130,903

 
113,424

Equity securities
 
2,079


1,605

 
5,876

 
4,492

Short-term investments
 
867


396

 
2,001

 
1,023

Other investments
 
7,211


2,659

 
10,868

 
9,493

Investment expenses
 
(2,802
)

(3,079
)
 
(8,421
)
 
(9,137
)
Net investment income earned
 
$
52,443

 
40,446

 
141,227

 
119,295
Schedule of Components of Net Realized and Unrealized Gains and Losses Excluding OTTI Charges
 
 
Quarter ended September 30,
 
Nine Months ended September 30,
($ in thousands)
 
2018
 
2017
 
2018
 
2017
Net realized (losses) gains on the disposals of securities:
 
 
 
 
 
 
 
 
Fixed income securities
 
$
(9,413
)
 
1,996

 
(13,922
)
 
6,566

Equity securities
 
8,665

 
4,875

 
17,960

 
5,225

Short-term investments
 
2

 
—

 
1

 
—

Other investments
 
(5
)
 
—

 
(5
)
 
461

Net realized gains on the disposal of securities
 
(751
)
 
6,871

 
4,034

 
12,252

OTTI charges
 
(1,426
)
 
(73
)
 
(5,459
)
 
(4,765
)
Net realized (losses) gains
 
(2,177
)
 
6,798

 
(1,425
)
 
7,487

Unrealized (losses) recognized in income on equity securities1
 
(2,610
)
 
—

 
(15,563
)
 
—

Total net realized and unrealized investment (losses) gains
 
$
(4,787
)
 
6,798

 
$
(16,988
)
 
7,487

1Includes unrealized holding gains (losses) of: (i) $5.5 million in Third Quarter 2018 and $4.2 million in Nine Months 2018 on equity securities remaining in our portfolio as of September 30, 2018; and (ii) $(8.1) million in Third Quarter 2018 and $(19.8) million in Nine Months 2018 on equity securities sold during the respective periods.
Schedule of Realized Gains and Losses on Disposals of Securities
 
 
Quarter ended September 30,
 
Nine Months ended September 30,
($ in thousands)
 
2018
 
2017
 
2018
 
2017
HTM fixed income securities
 
 
 
 
 
 
 
 
Gains
 
$
—

 
—

 
2

 
44

Losses
 
—

 
—

 
—

 
(1
)
AFS fixed income securities
 
 

 
 

 
 
 
 
Gains
 
462

 
2,070

 
5,056

 
8,337

Losses
 
(9,875
)
 
(74
)
 
(18,980
)
 
(1,814
)
Equity securities
 
 

 
 

 
 
 
 
Gains
 
10,584

 
4,875

 
20,209

 
5,225

Losses
 
(1,919
)
 
—

 
(2,249
)
 
—

Short-term investments
 
 
 
 
 
 
 
 
Gains
 
3

 
—

 
6

 
2

Losses
 
(1
)
 
—

 
(5
)
 
(2
)
Other investments
 
 
 
 
 
 
 
 
Gains
 
—

 
—

 
—

 
480

      Losses
 
(5
)

—

 
(5
)
 
(19
)
Total net realized gains (losses) on disposals of securities
 
$
(751
)

6,871

 
4,034

 
12,252