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Investments (Tables)
 6 Months Ended
Jun. 30, 2018
Investments [Line Items]  
Schedule of Held-to-maturity Securities
June 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
 
$
22,490

 
49

 
22,539

 
721

 
—

 
23,260

Corporate securities
 
19,567

 
(90
)
 
19,477

 
761

 
(125
)
 
20,113

Total HTM fixed income securities
 
$
42,057

 
(41
)
 
42,016

 
1,482

 
(125
)
 
43,373

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
June 30, 2018
 
 
 
 
 
 
 
 
($ in thousands)
 
Cost/
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
AFS fixed income securities:
 
 
 
 
 
 
 
 
U.S. government and government agencies
 
$
39,368

 
291

 
(763
)
 
38,896

Foreign government
 
18,024

 
87

 
(129
)
 
17,982

Obligations of states and political subdivisions
 
1,240,487

 
17,622

 
(4,442
)
 
1,253,667

Corporate securities
 
1,630,998

 
6,617

 
(23,131
)
 
1,614,484

Collateralized loan obligations and other asset-backed securities ("CLO and other ABS")
 
768,466

 
4,948

 
(1,817
)
 
771,597

Commercial mortgage-backed securities ("CMBS")
 
457,344

 
258

 
(6,009
)
 
451,593

Residential mortgage-backed securities (“RMBS”)
 
999,050

 
2,726

 
(12,342
)
 
989,434

Total AFS securities
 
$
5,153,737

 
32,549

 
(48,633
)
 
5,137,653

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
June 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
 
$
28,005

 
(763
)
 
—

 
—

 
28,005

 
(763
)
Foreign government
 
7,740

 
(129
)
 
—

 
—

 
7,740

 
(129
)
Obligations of states and political subdivisions
 
342,653

 
(4,316
)
 
3,422

 
(126
)
 
346,075

 
(4,442
)
Corporate securities
 
1,147,312

 
(22,989
)
 
2,762

 
(142
)
 
1,150,074

 
(23,131
)
CLO and other ABS
 
427,307

 
(1,813
)
 
774

 
(4
)
 
428,081

 
(1,817
)
CMBS
 
378,523

 
(6,009
)
 
—

 
—

 
378,523

 
(6,009
)
RMBS
 
739,217

 
(11,962
)
 
10,895

 
(380
)
 
750,112

 
(12,342
)
Total AFS securities
 
$
3,070,757

 
(47,981
)
 
17,853

 
(652
)
 
3,088,610

 
(48,633
)

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
 
$
186,138

 
8,309

 
8,383

Due after one year through five years
 
2,034,623

 
27,160

 
28,544

Due after five years through 10 years
 
2,733,420

 
6,547

 
6,446

Due after 10 years
 
183,472

 
—

 
—

Total fixed income securities
 
$
5,137,653

 
42,016

 
43,373
Schedule of Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy
Other Investments
 
June 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
 
$
59,681

 
110,833

 
170,514

 
52,251

 
99,026

 
151,277

   Private credit
 
40,916

 
89,757

 
130,673

 
37,743

 
94,959

 
132,702

   Real assets
 
23,430

 
36,588

 
60,018

 
25,379

 
27,014

 
52,393

Total alternative investments
 
124,027

 
237,178

 
361,205

 
115,373

 
220,999

 
336,372

Other securities
 
21,176

 
—

 
21,176

 
16,895

 
—

 
16,895

Total other investments
 
$
145,203

 
237,178

 
382,381

 
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 June 30,
 
Six Months ended June 30,
($ in millions)
 
2018
 
2017
 
2018
 
2017
Net investment loss
 
$
(6.4
)

(88.0
)
 
(41.8
)
 
(62.4
)
Realized gains (losses)
 
629.5


(69.2
)
 
1,223.5

 
(304.3
)
Net change in unrealized (depreciation) appreciation
 
(1,200.2
)

1,328.5

 
(738.6
)
 
1,890.0

Net (loss) gain
 
$
(577.1
)

1,171.3

 
443.1

 
1,523.3

Selective’s insurance subsidiaries’ alternative investments gain
 
$
1.9

 
5.2

 
3.5

 
6.8


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

 
—

 
22.3

 
22.3

Obligations of states and political subdivisions
 
—

 
—

 
3.1

 
3.1

CMBS
 
7.2

 
9.6

 
—

 
16.8

RMBS
 
58.2

 
79.8

 
—

 
138.0

Total pledged as collateral
 
$
65.4

 
89.4

 
25.4


180.2
Schedule of Pre-Tax Net Investment Income Earned
 
 
Quarter ended June 30,
 
Six Months ended June 30,
($ in thousands)
 
2018
 
2017
 
2018
 
2017
Fixed income securities
 
$
43,774


37,668

 
$
85,815

 
74,559

Equity securities
 
1,820


1,419

 
3,797

 
2,887

Short-term investments
 
611


377

 
1,134

 
627

Other investments
 
2,094


5,231

 
3,657

 
6,834

Investment expenses
 
(2,746
)

(3,265
)
 
(5,619
)
 
(6,058
)
Net investment income earned
 
$
45,553

 
41,430

 
$
88,784

 
78,849
Schedule of Components of Net Realized and Unrealized Gains and Losses Excluding OTTI Charges
 
 
Quarter ended June 30,
 
Six Months ended June 30,
($ in thousands)
 
2018
 
2017
 
2018
 
2017
Net realized (losses) gains on the disposals of securities:
 
 
 
 
 
 
 
 
Fixed income securities
 
$
(1,174
)
 
2,606

 
(4,509
)
 
4,570

Equity securities
 
1,226

 
350

 
9,295

 
350

Short-term investments
 
2

 
—

 
(1
)
 
—

Other investments
 
—

 
(5
)
 
—

 
461

Net realized gains on the disposal of securities
 
54

 
2,951

 
4,785

 
5,381

OTTI charges
 
(2,821
)
 
(1,217
)
 
(4,033
)
 
(4,692
)
Net realized (losses) gains
 
(2,767
)
 
1,734

 
752

 
689

Unrealized gains (losses) recognized in income on equity securities1
 
1,115

 
—

 
(12,953
)
 
—

Total net realized and unrealized investment (losses) gains
 
$
(1,652
)
 
1,734

 
$
(12,201
)
 
689

1Includes unrealized holding gains (losses) of: (i) $2.3 million in Second Quarter 2018 and $(2.7) million in Six Months 2018 on equity securities remaining in our portfolio as of June 30, 2018; and (ii) $(1.2) million in Second Quarter 2018 and $(10.3) million in Six Months 2018 on equity securities sold during the period.
Schedule of Realized Gains and Losses on Disposals of Securities
 
 
Quarter ended June 30,
 
Six Months ended June 30,
($ in thousands)
 
2018
 
2017
 
2018
 
2017
HTM fixed income securities
 
 
 
 
 
 
 
 
Gains
 
$
—

 
44

 
2

 
44

Losses
 
—

 
—

 
—

 
(1
)
AFS fixed income securities
 
 

 
 

 
 
 
 
Gains
 
1,971

 
2,715

 
4,594

 
6,267

Losses
 
(3,145
)
 
(153
)
 
(9,105
)
 
(1,740
)
Equity securities
 
 

 
 

 
 
 
 
Gains
 
1,226

 
350

 
9,625

 
350

Losses
 
—

 
—

 
(330
)
 
—

Short-term investments
 
 
 
 
 
 
 
 
Gains
 
2

 
—

 
3

 
2

Losses
 
—

 
—

 
(4
)
 
(2
)
Other investments
 
 
 
 
 
 
 
 
Gains
 
—

 
—

 
—

 
480

      Losses
 
—


(5
)
 
—

 
(19
)
Total net realized gains on disposals of securities
 
$
54


2,951

 
4,785

 
5,381