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Investments (Tables) | 3 Months Ended
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Mar. 31, 2018
Investments [Line Items] |
Schedule of Held-to-maturity Securities |
March 31, 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 |  | $ | 25,088 |  |  | 63 |  |  | 25,151 |  |  | 799 |  |  | — |  |  | 25,950 |
Corporate securities |  | 16,532 |  |  | (96 | ) |  | 16,436 |  |  | 877 |  |  | — |  |  | 17,313 |
Total HTM fixed income securities |  | $ | 41,620 |  |  | (33 | ) |  | 41,587 |  |  | 1,676 |  |  | — |  |  | 43,263 |
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 |
March 31, 2018 |  |  |  |  |  |  |  |
($ in thousands) |  | Cost/ Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
AFS fixed income securities: |  |  |  |  |  |  |  |
U.S. government and government agencies |  | $ | 51,163 |  |  | 410 |  |  | (624 | ) |  | 50,949 |
Foreign government |  | 18,032 |  |  | 253 |  |  | (85 | ) |  | 18,200 |
Obligations of states and political subdivisions |  | 1,304,321 |  |  | 18,475 |  |  | (4,636 | ) |  | 1,318,160 |
Corporate securities |  | 1,624,105 |  |  | 11,033 |  |  | (13,416 | ) |  | 1,621,722 |
Collateralized loan obligations and other asset-backed securities ("CLO and other ABS") |  | 789,717 |  |  | 5,765 |  |  | (999 | ) |  | 794,483 |
CMBS |  | 430,894 |  |  | 404 |  |  | (4,715 | ) |  | 426,583 |
Residential mortgage-backed securities (“RMBS”) |  | 918,365 |  |  | 2,911 |  |  | (9,736 | ) |  | 911,540 |
Total AFS securities |  | $ | 5,136,597 |  |  | 39,251 |  |  | (34,211 | ) |  | 5,141,637 |
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 |
March 31, 2018 |  | 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 |  | $ | 27,084 |  |  | (624 | ) |  | — |  |  | — |  |  | 27,084 |  |  | (624 | )
Foreign government |  | 6,367 |  |  | (85 | ) |  | — |  |  | — |  |  | 6,367 |  |  | (85 | )
Obligations of states and political subdivisions |  | 344,037 |  |  | (4,489 | ) |  | 3,416 |  |  | (147 | ) |  | 347,453 |  |  | (4,636 | )
Corporate securities |  | 910,974 |  |  | (13,348 | ) |  | 1,677 |  |  | (68 | ) |  | 912,651 |  |  | (13,416 | )
CLO and other ABS |  | 384,113 |  |  | (992 | ) |  | 1,095 |  |  | (7 | ) |  | 385,208 |  |  | (999 | )
CMBS |  | 321,980 |  |  | (4,715 | ) |  | — |  |  | — |  |  | 321,980 |  |  | (4,715 | )
RMBS |  | 749,493 |  |  | (9,422 | ) |  | 10,332 |  |  | (314 | ) |  | 759,825 |  |  | (9,736 | )
Total AFS securities |  | $ | 2,744,048 |  |  | (33,675 | ) |  | 16,520 |  |  | (536 | ) |  | 2,760,568 |  |  | (34,211 | )
December 31, 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 |  | $ | 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 |  | $ | 231,898 |  |  | 10,888 |  |  | 10,979 |
Due after one year through five years |  | 1,931,022 |  |  | 27,710 |  |  | 29,226 |
Due after five years through 10 years |  | 2,742,707 |  |  | 2,989 |  |  | 3,058 |
Due after 10 years |  | 236,010 |  |  | — |  |  | — |
Total fixed income securities |  | $ | 5,141,637 |  |  | 41,587 |  |  | 43,263 |
Schedule of Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy |
Other Investments |  | March 31, 2018 |  | December 31, 2017
($ in thousands) |  | Carrying Value |  | Remaining Commitment |  | Maximum Exposure to Loss 1 |  | Carrying Value |  | Remaining Commitment |  | Maximum Exposure to Loss 1
Alternative Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private equity |  | $ | 54,950 |  |  | 102,888 |  |  | 157,838 |  |  | 52,251 |  |  | 99,026 |  |  | 151,277 |
Private credit |  | 38,210 |  |  | 94,306 |  |  | 132,516 |  |  | 37,743 |  |  | 94,959 |  |  | 132,702 |
Real assets |  | 26,076 |  |  | 35,493 |  |  | 61,569 |  |  | 25,379 |  |  | 27,014 |  |  | 52,393 |
Total alternative investments |  | 119,236 |  |  | 232,687 |  |  | 351,923 |  |  | 115,373 |  |  | 220,999 |  |  | 336,372 |
Other securities |  | 24,322 |  |  | — |  |  | 24,322 |  |  | 16,895 |  |  | — |  |  | 16,895 |
Total other investments |  | $ | 143,558 |  |  | 232,687 |  |  | 376,245 |  |  | 132,268 |  |  | 220,999 |  |  | 353,267 |
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 March 31,
($ in millions) |  | 2018 |  | 2017
Net investment (loss) income |  | $ | (35.4 | ) |  | 25.6 |
Realized gains (losses) |  | 594.0 |  |  | (235.1 | )
Net change in unrealized appreciation (depreciation) |  | 461.6 |  |  | 561.5 |
Net gain |  | $ | 1,020.2 |  |  | 352.0 |
Selective’s insurance subsidiaries’ other investments gain |  | $ | 1.6 |  |  | 1.6 |
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 |  |  | — |  |  | 22.2 |  |  | 25.2 |
Obligations of states and political subdivisions |  | — |  |  | — |  |  | 3.2 |  |  | 3.2 |
CMBS |  | 7.3 |  |  | 23.5 |  |  | — |  |  | 30.8 |
RMBS |  | 57.6 |  |  | 132.5 |  |  | — |  |  | 190.1 |
Total pledged as collateral |  | $ | 67.9 |  |  | 156.0 |  |  | 25.4 |  |  | 249.3 |
Schedule of Pre-Tax Net Investment Income Earned |
|  | Quarter ended March 31,
($ in thousands) |  | 2018 |  | 2017
Fixed income securities |  | $ | 42,041 |  |  | 36,891 |
Equity securities |  | 1,977 |  |  | 1,468 |
Short-term investments |  | 523 |  |  | 250 |
Other investments |  | 1,563 |  |  | 1,603 |
Investment expenses |  | (2,873 | ) |  | (2,793 | )
Net investment income earned |  | $ | 43,231 |  |  | 37,419 |
Schedule of OTTI | OTTI charges were $1.2 million in First Quarter 2018 and $3.5 million in First Quarter 2017, with each security type's charge not exceeding 1% of its fair value.
Schedule of Components of Net Realized and Unrealized Gains and Losses Excluding OTTI Charges |
|  | Quarter ended March 31,
($ in thousands) |  | 2018 |  | 2017
Net realized (losses) gains on the disposals of securities: |  |  |  |
Fixed income securities |  | (3,335 | ) |  | 1,964 |
Equity securities |  | 8,069 |  |  | — |
Short-term investments |  | (3 | ) |  | — |
Other investments |  | — |  |  | 466 |
Net realized gains on the disposal of securities |  | 4,731 |  |  | 2,430 |
OTTI charges |  | (1,212 | ) |  | (3,475 | )
Net realized gains (losses) |  | 3,519 |  |  | (1,045 | )
Unrealized losses recognized in income on equity securities 1 |  | (14,068 | ) |  | — |
Total net realized and unrealized investment (losses) |  | $ | (10,549 | ) |  | (1,045 | )
1 Unrealized holding losses in First Quarter 2018 on equity securities held as of March 31, 2018 was $5.1 million. The components of net realized gains on disposals of securities for the periods indicated were as follows:
|  | Quarter ended March 31,
($ in thousands) |  | 2018 |  | 2017
HTM fixed income securities |  |  |  |
Gains |  | $ | 2 |  |  | — |
Losses |  | — |  |  | (1 | )
AFS fixed income securities |  |  |  |  |  |
Gains |  | 2,623 |  |  | 3,552 |
Losses |  | (5,960 | ) |  | (1,587 | )
Equity securities |  |  |  |  |  |
Gains |  | 8,399 |  |  | — |
Losses |  | (330 | ) |  | — |
Short-term investments |  |  |  |
Gains |  | 1 |  |  | — |
Losses |  | (4 | ) |  | — |
Other investments |  |  |  |
Gains |  | — |  |  | 480 |
Losses |  | — |  |  | (14 | )
Total net realized gains on disposals of securities |  | $ | 4,731 |  |  | 2,430 |

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