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Investments (Tables) | 6 Months Ended
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Jun. 30, 2017
Investments [Line Items] |
Schedule of Held-to-maturity Securities |
June 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 |  | $ | 53,734 |  |  | 185 |  |  | 53,919 |  |  | 1,703 |  |  | — |  |  | 55,622 |
Corporate securities |  | 18,714 |  |  | (119 | ) |  | 18,595 |  |  | 1,323 |  |  | — |  |  | 19,918 |
Total HTM fixed income securities |  | $ | 72,448 |  |  | 66 |  |  | 72,514 |  |  | 3,026 |  |  | — |  |  | 75,540 |
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 |
June 30, 2017 |  |  |  |  |  |  |  |
($ in thousands) |  | Cost/ Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
AFS fixed income securities: |  |  |  |  |  |  |  |
U.S. government and government agencies |  | $ | 66,932 |  |  | 1,103 |  |  | (32 | ) |  | 68,003 |
Foreign government |  | 18,157 |  |  | 557 |  |  | — |  |  | 18,714 |
Obligations of states and political subdivisions |  | 1,360,211 |  |  | 45,641 |  |  | (1,086 | ) |  | 1,404,766 |
Corporate securities |  | 1,782,993 |  |  | 39,041 |  |  | (524 | ) |  | 1,821,510 |
Collateralized loan obligations and other asset-backed securities ("CLO and other ABS") |  | 698,594 |  |  | 4,108 |  |  | (178 | ) |  | 702,524 |
CMBS |  | 277,320 |  |  | 2,128 |  |  | (243 | ) |  | 279,205 |
Residential mortgage-backed securities (“RMBS”) |  | 718,798 |  |  | 6,068 |  |  | (866 | ) |  | 724,000 |
Total AFS fixed income securities |  | 4,923,005 |  |  | 98,646 |  |  | (2,929 | ) |  | 5,018,722 |
AFS equity securities: |  |  |  |  |  |  |  |
Common stock |  | 115,315 |  |  | 30,108 |  |  | (987 | ) |  | 144,436 |
Preferred stock |  | 16,148 |  |  | 1,110 |  |  | — |  |  | 17,258 |
Total AFS equity securities |  | 131,463 |  |  | 31,218 |  |  | (987 | ) |  | 161,694 |
Total AFS securities |  | $ | 5,054,468 |  |  | 129,864 |  |  | (3,916 | ) |  | 5,180,416 |
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 |
June 30, 2017 |  | Less than 12 months |  | 12 months or longer |  | Total
($ in thousands) |  | Fair Value |  | Unrealized Losses 1 |  | Fair Value |  | Unrealized Losses 1 |  | Fair Value |  | Unrealized Losses 1
AFS fixed income securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and government agencies |  | $ | 12,670 |  |  | (32 | ) |  | — |  |  | — |  |  | 12,670 |  |  | (32 | )
Obligations of states and political subdivisions |  | 107,387 |  |  | (1,086 | ) |  | — |  |  | — |  |  | 107,387 |  |  | (1,086 | )
Corporate securities |  | 72,991 |  |  | (517 | ) |  | 2,531 |  |  | (7 | ) |  | 75,522 |  |  | (524 | )
CLO and other ABS |  | 156,406 |  |  | (178 | ) |  | — |  |  | — |  |  | 156,406 |  |  | (178 | )
CMBS |  | 42,671 |  |  | (243 | ) |  | — |  |  | — |  |  | 42,671 |  |  | (243 | )
RMBS |  | 179,293 |  |  | (860 | ) |  | 449 |  |  | (6 | ) |  | 179,742 |  |  | (866 | )
Total AFS fixed income securities |  | 571,418 |  |  | (2,916 | ) |  | 2,980 |  |  | (13 | ) |  | 574,398 |  |  | (2,929 | )
AFS equity securities: |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  | 18,423 |  |  | (987 | ) |  | — |  |  | — |  |  | 18,423 |  |  | (987 | )
Total AFS equity securities |  | 18,423 |  |  | (987 | ) |  | — |  |  | — |  |  | 18,423 |  |  | (987 | )
Total AFS |  | $ | 589,841 |  |  | (3,903 | ) |  | 2,980 |  |  | (13 | ) |  | 592,821 |  |  | (3,916 | )
December 31, 2016 |  | Less than 12 months |  | 12 months or longer |  | Total
($ in thousands) |  | Fair Value |  | Unrealized Losses 1 |  | Fair Value |  | Unrealized Losses 1 |  | Fair Value |  | Unrealized Losses 1
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 |  | $ | 306,493 |  |  | 34,521 |  |  | 34,898 |
Due after one year through five years |  | 2,095,055 |  |  | 29,648 |  |  | 31,498 |
Due after five years through 10 years |  | 2,379,624 |  |  | 8,345 |  |  | 9,144 |
Due after 10 years |  | 237,550 |  |  | — |  |  | — |
Total fixed income securities |  | $ | 5,018,722 |  |  | 72,514 |  |  | 75,540 |
Schedule of Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy |
Other Investments |  | June 30, 2017 |  | December 31, 2016
($ in thousands) |  | Carrying Value |  | Remaining Commitment |  | Maximum Exposure to Loss 1 |  | Carrying Value |  | Remaining Commitment |  | Maximum Exposure to Loss 1
Alternative Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private equity |  | $ | 46,945 |  |  | 76,027 |  |  | 122,972 |  |  | 41,135 |  |  | 76,774 |  |  | 117,909 |
Private credit |  | 29,942 |  |  | 57,391 |  |  | 87,333 |  |  | 28,193 |  |  | 40,613 |  |  | 68,806 |
Real assets |  | 20,783 |  |  | 31,237 |  |  | 52,020 |  |  | 14,486 |  |  | 22,899 |  |  | 37,385 |
Total alternative investments |  | 97,670 |  |  | 164,655 |  |  | 262,325 |  |  | 83,814 |  |  | 140,286 |  |  | 224,100 |
Other securities |  | 18,741 |  |  | — |  |  | 18,741 |  |  | 18,583 |  |  | 3,400 |  |  | 21,983 |
Total other investments |  | $ | 116,411 |  |  | 164,655 |  |  | 281,066 |  |  | 102,397 |  |  | 143,686 |  |  | 246,083 |
1 The 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) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Net investment (loss) income |  | $ | (9.9 | ) |  | (4.6 | ) |  | (62.4 | ) |  | 37.0 |
Realized gains |  | (70.2 | ) |  | 193.2 |  |  | (304.3 | ) |  | 981.1 |
Net change in unrealized depreciation |  | 1,418.5 |  |  | (253.9 | ) |  | 1,890.0 |  |  | (1,236.5 | )
Net gain |  | $ | 1,338.4 |  |  | (65.3 | ) |  | 1,523.3 |  |  | (218.4 | )
Selective’s insurance subsidiaries’ other investments gain (loss) |  | $ | 5.2 |  |  | (0.6 | ) |  | 6.8 |  |  | (1.7 | )
Schedule of Securities Pledged As Collateral |
($ in millions) |  | FHLBI Collateral |  | FHLBNY Collateral |  | State and Regulatory Deposits |  | Total
U.S. government and government agencies |  | $ | 3.1 |  |  | — |  |  | 23.9 |  |  | 27.0 |
Obligations of states and political subdivisions |  | — |  |  | — |  |  | 2.0 |  |  | 2.0 |
CMBS |  | 3.6 |  |  | 4.8 |  |  | — |  |  | 8.4 |
RMBS |  | 60.6 |  |  | 51.9 |  |  | — |  |  | 112.5 |
Total pledged as collateral |  | $ | 67.3 |  |  | 56.7 |  |  | 25.9 |  |  | 149.9 |
Schedule of Net Investment Income Earned |
|  | Quarter ended June 30, |  | Six Months ended June 30,
($ in thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Fixed income securities |  | $ | 37,668 |  |  | 31,753 |  |  | $ | 74,559 |  |  | 63,397 |
Equity securities |  | 1,419 |  |  | 2,204 |  |  | 2,887 |  |  | 4,434 |
Short-term investments |  | 377 |  |  | 142 |  |  | 627 |  |  | 301 |
Other investments |  | 5,231 |  |  | (611 | ) |  | 6,834 |  |  | (1,677 | )
Investment expenses |  | (3,265 | ) |  | (2,306 | ) |  | (6,058 | ) |  | (4,504 | )
Net investment income earned |  | $ | 41,430 |  |  | 31,182 |  |  | $ | 78,849 |  |  | 61,951 |
Schedule of OTTI By Asset Type |
Second Quarter 2017 |  | Gross |  | Included in Other Comprehensive Income ("OCI") |  | Recognized in Earnings
($ in thousands) |  |  |
AFS fixed income securities: |  |  |  |  |  |
U.S. government and government agencies |  | $ | 2 |  |  | — |  |  | 2 |
Obligations of states and political subdivisions |  | 239 |  |  | — |  |  | 239 |
Corporate securities |  | 381 |  |  | — |  |  | 381 |
CLO and other ABS |  | 62 |  |  | — |  |  | 62 |
CMBS |  | 220 |  |  | — |  |  | 220 |
RMBS |  | 71 |  |  | (6 | ) |  | 77 |
Total AFS fixed income securities |  | 975 |  |  | (6 | ) |  | 981 |
AFS equity securities: |  |  |  |  |  |
Common stock |  | 46 |  |  | — |  |  | 46 |
Total AFS equity securities |  | 46 |  |  | — |  |  | 46 |
Other Investments |  | 190 |  |  | — |  |  | 190 |
Total OTTI losses |  | $ | 1,211 |  |  | $ | (6 | ) |  | $ | 1,217 |
Second Quarter 2016 |  | Gross |  | Included in OCI |  | Recognized in Earnings
($ in thousands) |  |  |
AFS fixed income securities: |  |  |  |  |  |
Corporate securities |  | $ | 104 |  |  | — |  |  | 104 |
RMBS |  | 98 |  |  | 10 |  |  | 88 |
Total AFS fixed income securities |  | 202 |  |  | 10 |  |  | 192 |
AFS equity securities: |  |  |  |  |  |
Common stock |  | 357 |  |  | — |  |  | 357 |
Total AFS equity securities |  | 357 |  |  | — |  |  | 357 |
Total OTTI losses |  | $ | 559 |  |  | 10 |  |  | 549 |
Six Months 2017 |  | Gross |  | Included in Other Comprehensive Income ("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 |  | 575 |  |  | — |  |  | 575 |
CLO and other ABS |  | 85 |  |  | — |  |  | 85 |
CMBS |  | 670 |  |  | — |  |  | 670 |
RMBS |  | 1,163 |  |  | (6 | ) |  | 1,169 |
Total AFS fixed income securities |  | 3,136 |  |  | (6 | ) |  | 3,142 |
AFS equity securities: |  |  |  |  |  |
Common stock |  | 1,360 |  |  | — |  |  | 1,360 |
Total AFS equity securities |  | 1,360 |  |  | — |  |  | 1,360 |
Other Investments |  | 190 |  |  | — |  |  | 190 |
Total OTTI losses |  | $ | 4,686 |  |  | $ | (6 | ) |  | $ | 4,692 |
Six 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 |  | 2,974 |  |  | — |  |  | 2,974 |
Preferred stock |  | 3 |  |  | — |  |  | 3 |
Total AFS equity securities |  | 2,977 |  |  | — |  |  | 2,977 |
Total OTTI losses |  | $ | 4,152 |  |  | 10 |  |  | 4,142 |
Schedule of Components of Net Realized Gains Excluding OTTI Charges |
|  | Quarter ended June 30, |  | Six Months ended June 30,
($ in thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016
HTM fixed income securities |  |  |  |  |  |  |  |
Gains |  | $ | 44 |  |  | 3 |  |  | 44 |  |  | 3 |
Losses |  | — |  |  | — |  |  | (1 | ) |  | (1 | )
AFS fixed income securities |  |  |  |  |  |  |  |  |  |  |  |
Gains |  | 2,715 |  |  | 365 |  |  | 6,267 |  |  | 985 |
Losses |  | (153 | ) |  | (5 | ) |  | (1,740 | ) |  | (41 | )
AFS equity securities |  |  |  |  |  |  |  |  |  |  |  |
Gains |  | 350 |  |  | 2,171 |  |  | 350 |  |  | 2,501 |
Losses |  | — |  |  | (220 | ) |  | — |  |  | (240 | )
Other investments |  |  |  |  |  |  |  |
Gains |  | — |  |  | — |  |  | 480 |  |  | — |
Losses |  | (5 | ) |  | — |  |  | (19 | ) |  | (4 | )
Total net realized gains (excluding OTTI charges) |  | $ | 2,951 |  |  | 2,314 |  |  | 5,381 |  |  | 3,203 |

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- Definition Tabular disclosure of financial instruments held by the entity for its own account for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. Description may include equity, fixed income, debt or other securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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