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Investments (Tables)
 9 Months Ended
Sep. 30, 2017
Investments [Line Items]  
Schedule of Held-to-maturity Securities
September 30, 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
 
$
46,551

 
130

 
46,681

 
1,442

 
—

 
48,123

Corporate securities
 
18,426

 
(118
)
 
18,308

 
1,285

 
—

 
19,593

Total HTM fixed income securities
 
$
64,977

 
12

 
64,989

 
2,727

 
—

 
67,716

December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
($ in thousands)
 
Amortized
Cost
 
Net
 Unrealized Gains
 (Losses)
 
Carrying
Value
 
Unrecognized
 Holding
Gains
 
Unrecognized Holding
 Losses
 
Fair
Value
Obligations of states and political subdivisions
 
$
77,466

 
317

 
77,783

 
2,133

 
—

 
79,916

Corporate securities
 
22,711

 
(143
)
 
22,568

 
1,665

 
(158
)
 
24,075

Commercial mortgage-backed securities ("CMBS")
 
1,220

 
(15
)
 
1,205

 
15

 
—

 
1,220

Total HTM fixed income securities
 
$
101,397

 
159

 
101,556

 
3,813

 
(158
)
 
105,211

 
Schedule of Available-for-sale Securities
September 30, 2017
 
 
 
 
 
 
 
 
($ in thousands)
 
Cost/
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
AFS fixed income securities:
 
 
 
 
 
 
 
 
U.S. government and government agencies
 
$
58,820

 
906

 
(137
)
 
59,589

Foreign government
 
18,149

 
650

 
—

 
18,799

Obligations of states and political subdivisions
 
1,431,282

 
49,088

 
(432
)
 
1,479,938

Corporate securities
 
1,753,584

 
41,095

 
(845
)
 
1,793,834

Collateralized loan obligations and other asset-backed securities ("CLO and other ABS")
 
747,793

 
6,305

 
(143
)
 
753,955

CMBS
 
306,173

 
2,249

 
(318
)
 
308,104

Residential mortgage-backed
securities (“RMBS”)
 
710,934

 
8,842

 
(563
)
 
719,213

Total AFS fixed income securities
 
5,026,735

 
109,135

 
(2,438
)
 
5,133,432

AFS equity securities:
 
 
 
 
 
 
 
 
Common stock
 
131,869

 
29,900

 
(1,342
)
 
160,427

Preferred stock
 
14,115

 
748

 
(18
)
 
14,845

Total AFS equity securities
 
145,984

 
30,648

 
(1,360
)
 
175,272

Total AFS securities
 
$
5,172,719

 
139,783

 
(3,798
)
 
5,308,704

December 31, 2016
 
 
 
 
 
 
 
 
($ in thousands)
 
Cost/
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
AFS fixed income securities:
 
 
 
 
 
 
 
 
U.S. government and government agencies
 
$
75,139

 
2,230

 
(36
)
 
77,333

Foreign government
 
26,559

 
322

 
(16
)
 
26,865

Obligations of states and political subdivisions
 
1,366,287

 
18,610

 
(5,304
)
 
1,379,593

Corporate securities
 
1,976,556

 
27,057

 
(5,860
)
 
1,997,753

CLO and other ABS
 
527,876

 
1,439

 
(355
)
 
528,960

CMBS
 
256,356

 
1,514

 
(1,028
)
 
256,842

RMBS
 
524,986

 
3,006

 
(2,798
)
 
525,194

Total AFS fixed income securities
 
4,753,759

 
54,178

 
(15,397
)
 
4,792,540

AFS equity securities:
 
 
 
 
 
 
 
 
Common stock
 
104,663

 
26,250

 
(305
)
 
130,608

Preferred stock
 
16,226

 
274

 
(355
)
 
16,145

Total AFS equity securities
 
120,889

 
26,524

 
(660
)
 
146,753

Total AFS securities
 
$
4,874,648

 
80,702

 
(16,057
)
 
4,939,293
Schedule of Fair Value and Gross Pre-Tax Net Unrealized/Unrecognized Loss of Securities by Length of Time
September 30, 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
 
$
19,058

 
(136
)
 
250

 
(1
)
 
19,308

 
(137
)
Obligations of states and political subdivisions
 
67,538

 
(432
)
 
—

 
—

 
67,538

 
(432
)
Corporate securities
 
108,011

 
(827
)
 
1,475

 
(18
)
 
109,486

 
(845
)
CLO and other ABS
 
88,636

 
(143
)
 
—

 
—

 
88,636

 
(143
)
CMBS
 
65,016

 
(245
)
 
5,216

 
(73
)
 
70,232

 
(318
)
RMBS
 
96,981

 
(558
)
 
592

 
(5
)
 
97,573

 
(563
)
Total AFS fixed income securities
 
445,240

 
(2,341
)
 
7,533

 
(97
)
 
452,773

 
(2,438
)
AFS equity securities:
 
 
 
 
 
 
 
 
 
 
 
 
Common stock
 
18,032

 
(1,342
)
 
—

 
—

 
18,032

 
(1,342
)
Preferred stock
 
3,886

 
(18
)
 
—

 
—

 
3,886

 
(18
)
Total AFS equity securities
 
21,918

 
(1,360
)
 
—

 
—

 
21,918

 
(1,360
)
Total AFS
 
$
467,158

 
(3,701
)
 
7,533

 
(97
)
 
474,691

 
(3,798
)

December 31, 2016
 
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
 
$
6,419

 
(36
)
 
—

 
—

 
6,419

 
(36
)
Foreign government
 
13,075

 
(16
)
 
—

 
—

 
13,075

 
(16
)
Obligations of states and political subdivisions
 
306,509

 
(5,304
)
 
—

 
—

 
306,509

 
(5,304
)
Corporate securities
 
462,902

 
(5,771
)
 
4,913

 
(89
)
 
467,815

 
(5,860
)
CLO and other ABS
 
189,795

 
(354
)
 
319

 
(1
)
 
190,114

 
(355
)
CMBS
 
82,492

 
(1,021
)
 
1,645

 
(7
)
 
84,137

 
(1,028
)
RMBS
 
279,480

 
(2,489
)
 
8,749

 
(309
)
 
288,229

 
(2,798
)
Total AFS fixed income securities
 
1,340,672

 
(14,991
)
 
15,626

 
(406
)
 
1,356,298

 
(15,397
)
AFS equity securities:
 
 
 
 
 
 
 
 
 
 
 
 
Common stock
 
11,271

 
(305
)
 
—

 
—

 
11,271

 
(305
)
Preferred stock
 
6,168

 
(355
)
 
—

 
—

 
6,168

 
(355
)
Total AFS equity securities
 
17,439

 
(660
)
 
—

 
—

 
17,439

 
(660
)
Total AFS
 
$
1,358,111

 
(15,651
)
 
15,626

 
(406
)
 
1,373,737

 
(16,057
)
  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
 
$
337,546

 
27,335

 
27,531

Due after one year through five years
 
2,148,949

 
29,341

 
31,037

Due after five years through 10 years
 
2,377,658

 
8,313

 
9,148

Due after 10 years
 
269,279

 
—

 
—

Total fixed income securities
 
$
5,133,432

 
64,989

 
67,716
Schedule of Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy
Other Investments
 
September 30, 2017
 
December 31, 2016
($ in thousands)
 
Carrying Value
 
Remaining Commitment
 
Maximum Exposure to Loss1
 
Carrying Value
 
Remaining Commitment
 
Maximum Exposure to Loss1
Alternative Investments
 
 

 
 

 
 
 
 
 
 
 
 
   Private equity
 
$
47,654

 
81,478

 
129,132

 
41,135

 
76,774

 
117,909

   Private credit
 
33,318

 
53,635

 
86,953

 
28,193

 
40,613

 
68,806

   Real assets
 
21,649

 
31,466

 
53,115

 
14,486

 
22,899

 
37,385

Total alternative investments
 
102,621

 
166,579

 
269,200

 
83,814

 
140,286

 
224,100

Other securities
 
18,185

 
—

 
18,185

 
18,583

 
3,400

 
21,983

Total other investments
 
$
120,806

 
166,579

 
287,385

 
102,397

 
143,686

 
246,083


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)
 
2017
 
2016
 
2017
 
2016
Net investment (loss) income
 
$
(10.3
)

(55.4
)
 
(61.8
)
 
26.1

Realized gains (losses)
 
43.3


245.6

 
(261.0
)
 
1,186.8

Net change in unrealized appreciation (depreciation)
 
1,072.0


117.8

 
3,186.3

 
(1,132.8
)
Net gain
 
$
1,105.0


308.0

 
2,863.5

 
80.1

Selective’s insurance subsidiaries’ other investments gain
 
$
2.7

 
1.6

 
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
 
$
3.0

 
—

 
22.8

 
25.8

Obligations of states and political subdivisions
 
—

 
—

 
3.2

 
3.2

CMBS
 
3.5

 
4.8

 
—

 
8.3

RMBS
 
58.7

 
49.6

 
—

 
108.3

Total pledged as collateral
 
$
65.2

 
54.4

 
26.0


145.6
Schedule of Net Investment Income Earned
 
 
Quarter ended September 30,
 
Nine Months ended September 30,
($ in thousands)
 
2017
 
2016
 
2017
 
2016
Fixed income securities
 
$
38,865


32,453

 
$
113,424

 
95,850

Equity securities
 
1,605


1,506

 
4,492

 
5,940

Short-term investments
 
396


192

 
1,023

 
493

Other investments
 
2,659


1,628

 
9,493

 
(49
)
Investment expenses
 
(3,079
)

(2,404
)
 
(9,137
)
 
(6,908
)
Net investment income earned
 
$
40,446

 
33,375

 
$
119,295

 
95,326
Schedule of OTTI By Asset Type
Third Quarter 2017
 
Gross 
 
Included in Other Comprehensive Income ("OCI")
 
Recognized in
Earnings
($ in thousands) 
 
 
 
AFS fixed income securities:
 
 
 
 
 
 
Corporate securities
 
$
12

 
—

 
12

CLO and other ABS
 
11

 
—

 
11

RMBS
 
20

 
(30
)
 
50

Total OTTI losses
 
$
43

 
(30
)
 
73

 
 
 
 
 
 
 
Third Quarter 2016
 
Gross 
 
Included in OCI
 
Recognized in
Earnings
($ in thousands) 
 
 
 
AFS equity securities:
 
 
 
 
 
 
Common stock
 
$
342

 
—

 
342

Total AFS equity securities
 
342

 
—

 
342

Total OTTI losses
 
$
342

 
—

 
342

 
 
 
 
 
 
 
Nine Months 2017
 
Gross 
 
Included in OCI
 
Recognized in
Earnings
($ in thousands) 
 
 
 
AFS fixed income securities:
 
 
 
 
 
 
U.S. government and government agencies
 
$
31

 
—

 
31

Obligations of states and political subdivisions
 
612

 
—

 
612

Corporate securities
 
587

 
—

 
587

CLO and other ABS
 
96

 
—

 
96

CMBS
 
670

 
—

 
670

RMBS
 
1,183

 
(36
)
 
1,219

Total AFS fixed income securities
 
3,179

 
(36
)
 
3,215

AFS equity securities:
 
 
 
 
 
 
Common stock
 
1,360

 
—

 
1,360

Total AFS equity securities
 
1,360

 
—

 
1,360

Other Investments
 
190

 
—

 
190

Total OTTI losses
 
$
4,729

 
(36
)
 
4,765

 
 
 
 
 
 
 
Nine Months 2016
 
Gross 
 
Included in OCI
 
Recognized in
Earnings
($ in thousands) 
 
 
 
AFS fixed income securities:
 
 
 
 
 
 
Corporate securities
 
$
1,077

 
—

 
1,077

RMBS
 
98

 
10

 
88

Total AFS fixed income securities
 
1,175

 
10

 
1,165

AFS equity securities:
 
 
 
 
 
 
Common stock
 
3,316

 
—

 
3,316

Preferred stock
 
3

 
—

 
3

Total AFS equity securities
 
3,319

 
—

 
3,319

Total OTTI losses
 
$
4,494

 
10

 
4,484
Schedule of Components of Net Realized Gains Excluding OTTI Charges
 
 
Quarter ended September 30,
 
Nine Months ended September 30,
($ in thousands)
 
2017
 
2016
 
2017
 
2016
HTM fixed income securities
 
 
 
 
 
 
 
 
Gains
 
$
—

 
—

 
44

 
3

Losses
 
—

 
—

 
(1
)
 
(1
)
AFS fixed income securities
 
 

 
 

 
 
 
 
Gains
 
2,070

 
2,204

 
8,337

 
3,189

Losses
 
(74
)
 
(40
)
 
(1,814
)
 
(81
)
AFS equity securities
 
 

 
 

 
 
 
 
Gains
 
4,875

 
1,863

 
5,225

 
4,364

Losses
 
—

 
—

 
—

 
(240
)
Other investments
 
 
 
 
 
 
 
 
Gains
 
—

 
3

 
480

 
3

      Losses
 
—


—

 
(19
)
 
(4
)
Total net realized gains (excluding OTTI charges)
 
$
6,871


4,030

 
12,252

 
7,233