10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended: September 30, 2019

or

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from_____________________________to_____________________________

Commission File Number: 001-33067

SELECTIVE INSURANCE GROUP, INC.

(Exact Name of Registrant as Specified in Its Charter)

 

New Jersey	22-2168890
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification No.)

40 Wantage Avenue

Branchville, New Jersey 07890        

(Address of Principal Executive Offices) (Zip Code)

973	948-3000
(Registrant’s Telephone Number, Including Area Code)
(Former Name, Former Address and Former Fiscal Year, if Changed Since Last Report)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol	Name of each exchange on which registered
Common Stock, par value $2 per share	SIGI	NASDAQ Global Select Market

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒           No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒   No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☒	Accelerated filer ☐
Non-accelerated filer ☐		Smaller reporting company	☐
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).                                                              Yes ☐       No ☒   

As of October 18, 2019, there were 59,401,565 shares of common stock, par value $2.00 per share, outstanding. 

	SELECTIVE INSURANCE GROUP, INC.
	Table of Contents
		Page No.
PART I.   FINANCIAL INFORMATION
Item 1.	Financial Statements
	Consolidated Balance Sheets as of September 30, 2019 (Unaudited) and December 31, 2018	1
	Unaudited Consolidated Statements of Income for the Quarter and Nine Months Ended September 30, 2019 and 2018	2
	Unaudited Consolidated Statements of Comprehensive Income for the Quarter and Nine Months Ended September 30, 2019 and 2018	3
	Unaudited Consolidated Statements of Stockholders' Equity for the Quarter and Nine Months Ended September 30, 2019 and 2018	4
	Unaudited Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2019 and 2018	5
	Notes to Unaudited Interim Consolidated Financial Statements	6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations
	Forward-Looking Statements	23
	Introduction	24
	Critical Accounting Policies and Estimates	24
	Financial Highlights of Results for Third Quarter and Nine Months 2019 and Third Quarter and Nine Months 2018	25
	Results of Operations and Related Information by Segment	30
	Federal Income Taxes	38
	Financial Condition, Liquidity, and Capital Resources	38
	Ratings	41
	Off-Balance Sheet Arrangements	41
	Contractual Obligations, Contingent Liabilities, and Commitments	42
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	42
Item 4.	Controls and Procedures	42
PART II.  OTHER INFORMATION
Item 1.	Legal Proceedings	42
Item 1A.	Risk Factors	43
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	43
Item 6.	Exhibits	44
Signatures		44

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS.

SELECTIVE INSURANCE GROUP, INC. CONSOLIDATED BALANCE SHEETS	Unaudited
($ in thousands, except share amounts)	September 30, 2019			December 31, 2018
ASSETS
Investments:
Fixed income securities, held-to-maturity – at carrying value (fair value:  $28,356 – 2019; $38,317 – 2018)	$	26,925		37,110
Fixed income securities, available-for-sale – at fair value (amortized cost: $5,706,656 – 2019; $5,270,798 – 2018)	5,930,237			5,273,100
Equity securities – at fair value (cost:  $77,779 – 2019; $138,144 – 2018)	79,213			147,639
Short-term investments (at cost which approximates fair value)	326,121			323,864
Other investments	189,243			178,938
Total investments (Note 4 and 6)	6,551,739			5,960,651
Cash	516			505
Restricted cash	9,647			16,414
Interest and dividends due or accrued	42,975			41,620
Premiums receivable, net of allowance for uncollectible accounts of:  $7,800 – 2019; $9,400 – 2018	860,480			770,518
Reinsurance recoverable, net of allowance for uncollectible accounts of: $4,400 – 2019; $4,500 – 2018	575,984			549,172
Prepaid reinsurance premiums	173,557			157,723
Deferred federal income tax	5,509			53,540
Property and equipment – at cost, net of accumulated depreciation and amortization of: $223,518 – 2019; $211,657 – 2018	76,423			65,248
Deferred policy acquisition costs	279,239			252,612
Goodwill	7,849			7,849
Other assets	135,488			76,877
Total assets	$	8,719,406		7,952,729
LIABILITIES AND STOCKHOLDERS’ EQUITY
Liabilities:
Reserve for loss and loss expense (Note 8)	$	4,055,631		3,893,868
Unearned premiums	1,570,226			1,431,932
Long-term debt	550,669			439,540
Current federal income tax	2,656			1,302
Accrued salaries and benefits	100,445			116,706
Other liabilities	302,403			277,579
Total liabilities	$	6,582,030		6,160,927
Stockholders’ Equity:
Preferred stock of $0 par value per share:	$	—		—
Authorized shares 5,000,000; no shares issued or outstanding
Common stock of $2 par value per share:
Authorized shares 360,000,000
Issued: 103,421,301 – 2019; 102,848,394 – 2018	206,843			205,697
Additional paid-in capital	412,347			390,315
Retained earnings	2,012,499			1,858,414
Accumulated other comprehensive income (loss) (Note 11)	98,426			(77,956	)
Treasury stock – at cost (shares:  44,021,732 – 2019; 43,899,840 – 2018)	(592,739		)	(584,668	)
Total stockholders’ equity	$	2,137,376		1,791,802
Commitments and contingencies
Total liabilities and stockholders’ equity	$	8,719,406		7,952,729

The accompanying notes are an integral part of these unaudited interim consolidated financial statements.

1

SELECTIVE INSURANCE GROUP, INC. UNAUDITED CONSOLIDATED STATEMENTS OF INCOME	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands, except per share amounts)	2019			2018		2019		2018
Revenues:
Net premiums earned	$	653,620		614,277		1,928,812		1,810,941
Net investment income earned	55,826			52,443		164,949		141,227
Net realized and unrealized (losses) gains:
Net realized investment gains (losses) on disposals	20,425			(751	)	26,752		4,034
Unrealized losses on equity securities	(20,317		)	(2,610	)	(8,091	)	(15,563	)
Other-than-temporary impairments	(2,291		)	(1,426	)	(3,366	)	(5,459	)
Total net realized and unrealized (losses) gains	(2,183		)	(4,787	)	15,295		(16,988	)
Other income	3,162			2,538		8,535		7,896
Total revenues	710,425			664,471		2,117,591		1,943,076
Expenses:
Loss and loss expense incurred	398,675			379,199		1,166,238		1,130,468
Amortization of deferred policy acquisition costs	136,572			124,511		399,647		368,265
Other insurance expenses	90,234			80,108		261,975		244,342
Interest expense	7,397			6,073		26,289		18,350
Corporate expenses	6,369			7,450		28,345		22,065
Total expenses	639,247			597,341		1,882,494		1,783,490
Income before federal income tax	71,178			67,130		235,097		159,586
Federal income tax expense:
Current	13,805			10,314		44,344		23,529
Deferred	1,223			1,381		989		2,878
Total federal income tax expense	15,028			11,695		45,333		26,407
Net income	$	56,150		55,435		189,764		133,179
Earnings per share:
Basic net income	$	0.94		0.94		3.20		2.26
Diluted net income	$	0.93		0.93		3.16		2.23

The accompanying notes are an integral part of these unaudited interim consolidated financial statements. 

2

SELECTIVE INSURANCE GROUP, INC. UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019		2018
Net income	$	56,150		55,435		189,764		133,179
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) on investment securities:
Unrealized holding gains (losses) arising during period	27,168			(17,036	)	174,483		(103,389	)
Amounts reclassified into net income:
Held-to-maturity securities	(2		)	(6	)	(26	)	(22	)
Realized losses on disposals and other-than-temporary impairments of available-for-sale securities	2,229			8,563		351		14,424
Total unrealized gains (losses) on investment securities	29,395			(8,479	)	174,808		(88,987	)
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	525			420		1,574		1,260
Total defined benefit pension and post-retirement plans	525			420		1,574		1,260
Other comprehensive income (loss)	29,920			(8,059	)	176,382		(87,727	)
Comprehensive income	$	86,070		47,376		366,146		45,452

The accompanying notes are an integral part of these unaudited interim consolidated financial statements.

3

SELECTIVE INSURANCE GROUP, INC. UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands, except share and per share amounts)	2019			2018		2019		2018
Common stock:
Beginning of period	$	206,665		205,460		205,697		204,569
Dividend reinvestment plan	9			10		31		35
Stock purchase and compensation plans	169			103		1,115		969
End of period	206,843			205,573		206,843		205,573
Additional paid-in capital:
Beginning of period	407,382			381,641		390,315		367,717
Dividend reinvestment plan	366			327		1,095		1,013
Stock purchase and compensation plans	4,599			3,483		20,937		16,721
End of period	412,347			385,451		412,347		385,451
Retained earnings:
Beginning of period, as previously reported	1,968,374			1,779,928		1,858,414		1,698,613
Cumulative effect adjustment due to adoption of equity security guidance, net of tax	—			—		—		30,726
Cumulative effect adjustment due to adoption of stranded deferred tax guidance	—			—		—		(5,707	)
Cumulative effect adjustment due to adoption of lease guidance, net of tax (Note 2)	—			—		342		—
Balance at beginning of period, as adjusted	1,968,374			1,779,928		1,858,756		1,723,632
Net income	56,150			55,435		189,764		133,179
Dividends to stockholders	(12,025		)	(10,756	)	(36,021	)	(32,204	)
End of period	2,012,499			1,824,607		2,012,499		1,824,607
Accumulated other comprehensive income (loss):
Beginning of period, as previously reported	68,506			(84,517	)	(77,956	)	20,170
Cumulative effect adjustment due to adoption of equity security guidance, net of tax	—			—		—		(30,726	)
Cumulative effect adjustment due to adoption of stranded deferred tax guidance	—			—		—		5,707
Balance at beginning of period, as adjusted	68,506			(84,517	)	(77,956	)	(4,849	)
Other comprehensive income (loss)	29,920			(8,059	)	176,382		(87,727	)
End of period	98,426			(92,576	)	98,426		(92,576	)
Treasury stock:
Beginning of period	(591,383		)	(584,357	)	(584,668	)	(578,112	)
Acquisition of treasury stock	(1,356		)	(178	)	(8,071	)	(6,423	)
End of period	(592,739		)	(584,535	)	(592,739	)	(584,535	)
Total stockholders’ equity	$	2,137,376		1,738,520		2,137,376		1,738,520
Dividends declared per share to stockholders	$	0.20		0.18		0.60		0.54
Common stock, shares outstanding:
Beginning of period	59,328,108			58,835,052		58,948,554		58,495,122
Dividend reinvestment plan	4,738			5,310		15,650		17,683
Stock purchase and compensation plan	83,979			51,482		557,257		484,491
Acquisition of treasury stock	(17,256		)	(2,859	)	(121,892	)	(108,311	)
End of period	59,399,569			58,888,985		59,399,569		58,888,985

Selective Insurance Group, Inc. also has authorized, but not issued, 5,000,000 shares of preferred stock, without par value, of which 300,000 shares have been

designated Series A junior preferred stock, without par value.

The accompanying notes are an integral part of these unaudited interim consolidated financial statements.

4

SELECTIVE INSURANCE GROUP, INC. UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS	Nine Months ended September 30,
($ in thousands)	2019			2018
Operating Activities
Net income	$	189,764		133,179
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	42,346			34,961
Stock-based compensation expense	15,857			12,150
Undistributed gains of equity method investments	(8,832		)	(4,243	)
Distributions in excess of current year income of equity method investments	2,267			3,210
(Gain) loss on disposal of fixed assets	(21		)	62
Net realized and unrealized (gains) losses	(15,295		)	16,988
Changes in assets and liabilities:
Increase in reserve for loss and loss expense, net of reinsurance recoverable	134,951			144,920
Increase in unearned premiums, net of prepaid reinsurance	122,460			120,535
Decrease in net federal income taxes	2,408			18,339
Increase in premiums receivable	(89,962		)	(79,894	)
Increase in deferred policy acquisition costs	(26,627		)	(22,978	)
(Increase) decrease in interest and dividends due or accrued	(1,460		)	72
Decrease in accrued salaries and benefits	(16,261		)	(36,498	)
Increase in other assets	(35,810		)	(13,881	)
Increase (decrease) in other liabilities	414			(34,437	)
Net cash provided by operating activities	316,199			292,485
Investing Activities
Purchase of fixed income securities, held-to-maturity	—			(7,150	)
Purchase of fixed income securities, available-for-sale	(1,330,827		)	(1,974,253	)
Purchase of equity securities	(40,233		)	(57,834	)
Purchase of other investments	(41,248		)	(47,238	)
Purchase of short-term investments	(4,108,414		)	(2,711,360	)
Sale of fixed income securities, available-for-sale	461,825			1,382,677
Sale of short-term investments	4,106,643			2,572,399
Redemption and maturities of fixed income securities, held-to-maturity	10,062			3,923
Redemption and maturities of fixed income securities, available-for-sale	413,220			456,037
Sale of equity securities	125,302			79,676
Sale of other investments	18,016			3,497
Distributions from other investments	19,054			23,420
Purchase of property and equipment	(24,424		)	(11,150	)
Fixed asset disposals	35			—
Net cash used in investing activities	(390,989		)	(287,356	)
Financing Activities
Dividends to stockholders	(34,440		)	(30,694	)
Acquisition of treasury stock	(8,071		)	(6,423	)
Net proceeds from stock purchase and compensation plans	5,599			5,001
Proceeds from borrowings	355,757			130,000
Repayments of borrowings	(250,000		)	(130,000	)
Repayments of finance lease obligations	(811		)	(4,891	)
Net cash provided by (used in) financing activities	68,034			(37,007	)
Net decrease in cash and restricted cash	(6,756		)	(31,878	)
Cash and restricted cash, beginning of year	16,919			44,710
Cash and restricted cash, end of period	$	10,163		12,832

The accompanying notes are an integral part of these unaudited interim consolidated financial statements.

5

NOTES TO UNAUDITED INTERIM CONSOLIDATED FINANCIAL STATEMENTS

NOTE 1. Basis of Presentation

As used herein, the "Company,” “we,” “us,” or “our” refers to Selective Insurance Group, Inc. (the "Parent"), and its subsidiaries, except as expressly indicated or unless the context otherwise requires. Our interim unaudited consolidated financial statements (“Financial Statements”) have been prepared by us in conformity with U.S. generally accepted accounting principles (“GAAP”) and the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding interim financial reporting. The preparation of the Financial Statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported financial statement balances, as well as the disclosure of contingent assets and liabilities. Actual results could differ from those estimates. All significant intercompany accounts and transactions between the Parent and its subsidiaries are eliminated in consolidation.

Our Financial Statements reflect all adjustments that, in our opinion, are normal, recurring, and necessary for a fair presentation of our results of operations and financial condition. Our Financial Statements cover the third quarters ended September 30, 2019 (“Third Quarter 2019”) and September 30, 2018 (“Third Quarter 2018”) and the nine-month periods ended September 30, 2019 (“Nine Months 2019”) and September 30, 2018 (“Nine Months 2018”). These Financial Statements do not include all of the information and disclosures required by GAAP and the SEC for audited annual financial statements. Additionally, results of operations for any interim period are not necessarily indicative of results for a full year. Consequently, our Financial Statements should be read in conjunction with the consolidated financial statements contained in our Annual Report on Form 10-K for the year ended December 31, 2018 (“2018 Annual Report”) filed with the SEC.

NOTE 2. Adoption of Accounting Pronouncements 

The Financial Accounting Standards Board ("FASB") issued new leasing guidance through ASU 2016-02, Leases, which was issued in February 2016, as well as additional implementation guidance that was issued in 2018 and 2019 (collectively referred to as "ASU 2016-02"). ASU 2016-02 requires all lessees to recognize assets and liabilities on their balance sheets for the rights and obligations created by leases with terms longer than 12 months. For leases with a term of 12 months or less, an accounting policy election is allowed to recognize lease expense on a straight-line basis over the lease term.

ASU 2016-02 allows for certain practical expedients, accounting policy elections, and a transition method election. We adopted practical expedients related to reassessing: (i) whether our existing contracts are, or contain, leases; (ii) lease classification for existing leases; and (iii) initial direct costs for existing leases. Additionally, we adopted accounting policy elections to: (i) aggregate lease and non-lease components of a contract into a single lease component; and (ii) expense short-term leases on a straight-line basis over the lease term. We adopted ASU 2016-02 effective January 1, 2019. See Note 12. "Leases" in this Form 10-Q for additional information regarding our leases and the impact of this guidance on our financial condition and results of operations.

In June 2018, the FASB issued ASU 2018-07, Compensation - Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting ("ASU 2018-07"). The amendments in ASU 2018-07 expand the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. We adopted ASU 2018-07 in the first quarter of 2019 and it did not have a material impact on our financial condition or results of operations.

Pronouncements to be effective in the future

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses, as well as additional implementation guidance issued in 2018 and 2019 (collectively referred to as “ASU 2016-13”). ASU 2016-13 will change the way entities recognize impairment of financial assets by requiring immediate recognition of estimated credit losses expected to occur over the remaining life of many financial assets, including, among others, held-to-maturity ("HTM") debt securities, trade receivables, and reinsurance recoverables. ASU 2016-13 requires a valuation allowance to be calculated on financial assets, and that they be presented on the financial statements net of the valuation allowance. The valuation allowance is a measurement of expected losses that is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. This methodology is referred to as the current expected credit loss model. This ASU also made targeted changes to the impairment accounting model for available-for-sale ("AFS") debt securities. ASU 2016-13 is effective for fiscal years beginning after December 15, 2019, including interim periods within those annual periods. We are currently evaluating the impact of this guidance on our financial condition and results of operations.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement: Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement (“ASU 2018-13”). ASU 2018-13 modifies the disclosure requirements for fair value measurements. The modifications removed the following disclosure requirements: (i) the amount of, and reasons for, transfers between Level 1 and Level 2 of the fair value hierarchy; (ii) the policy for timing of transfers between levels; and (iii) the

6

valuation processes for Level 3 fair value measurements. This ASU added the following disclosure requirements: (i) the changes in unrealized gains and losses for the period included in other comprehensive income ("OCI") for recurring Level 3 fair value measurements held at the end of the reporting period; and (ii) the range and weighted average of significant observable inputs used to develop Level 3 fair value measurements. This update is effective for annual and interim periods beginning after December 15, 2019, with early adoption permitted. As the requirements of this literature are disclosure only, ASU 2018-13 will not impact our financial condition or results of operations.

In August 2018, the FASB issued ASU 2018-14, Compensation - Retirement Benefits - Defined Benefit Plans - General: Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans (“ASU 2018-14”). ASU 2018-14 modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. These modifications include: (i) removing the requirement to disclose the amount in accumulated other comprehensive income ("AOCI") expected to be recognized as components of net periodic benefit cost over the next fiscal year; and (ii) adding the requirement to disclose an explanation of the reasons for significant gains or losses related to changes in the benefit obligation for the period. This update is effective for fiscal years ending after December 15, 2020, with early adoption permitted. As the requirements of this literature are disclosure only, ASU 2018-14 will not impact our financial condition or results of operations.

In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software: Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (“ASU 2018-15”). ASU 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. This update is effective for annual and interim periods beginning after December 15, 2019, with early adoption permitted. We are currently evaluating the impact of this guidance on our financial condition or results of operations.

NOTE 3. Statements of Cash Flows

Supplemental cash flow information was as follows:

	Nine Months ended September 30,
($ in thousands)	2019		2018
Cash paid during the period for:
Interest	$	19,261	15,449
Federal income tax	42,000		7,193
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases1	6,062		—
Operating cash flows from financing leases	12		—
Financing cash flows from finance leases	811		4,891
Non-cash items:
Corporate actions related to fixed income securities, AFS2	29,771		32,757
Corporate actions related to equity securities2	14,250		944
Assets acquired under finance lease arrangements	824		4,114
Assets acquired under operating lease arrangements1	13,648		—
Non-cash purchase of property and equipment	108		—

¹Upon adoption of ASU 2016-02, effective January 1, 2019, we are required to disclose cash paid for amounts included in the measurement of operating lease liabilities, as well as supplemental non-cash information on operating lease liabilities arising from obtaining operating lease assets.

²Examples of such corporate actions include exchanges, non-cash acquisitions, and stock splits.

The following table provides a reconciliation of cash and restricted cash reported within the Consolidated Balance Sheets that equate to the amount reported in the Consolidated Statements of Cash Flows:

($ in thousands)	September 30, 2019		December 31, 2018
Cash	$	516	505
Restricted cash	9,647		16,414
Total cash and restricted cash shown in the Statements of Cash Flows	$	10,163	16,919

Amounts included in restricted cash represent cash received from the National Flood Insurance Program ("NFIP"), which is restricted to pay flood claims under the Write Your Own program.

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NOTE 4. Investments

(a) Our HTM fixed income securities as of September 30, 2019 represented less than 1% of our total invested assets, down slightly compared to December 31, 2018. The carry value and net unrealized/unrecognized gains were $26.9 million and $1.5 million, respectively, at September 30, 2019, and $37.1 million and $1.3 million, respectively, at December 31, 2018. Included in the net unrealized/unrecognized gains were gross unrealized/unrecognized losses of less than $0.1 million at September 30, 2019 and $0.2 million at December 31, 2018.

Unrecognized holding gains and losses of HTM securities are not reflected in the Financial Statements, as they represent fair value fluctuations from the date a security is designated as HTM through the date of the balance sheet.

(b) Information regarding our AFS securities as of September 30, 2019 and December 31, 2018 was as follows:

September 30, 2019
($ in thousands)	Cost/ Amortized Cost		Unrealized Gains	Unrealized Losses		Fair Value
AFS fixed income securities:
U.S. government and government agencies	$	116,555	4,357	(12	)	120,900
Foreign government	20,947		573	—		21,520
Obligations of states and political subdivisions	1,127,709		62,910	(4	)	1,190,615
Corporate securities	1,762,981		78,345	(2,399	)	1,838,927
Collateralized loan obligations and other asset-backed securities ("CLO and other ABS")	764,038		8,998	(4,653	)	768,383
Commercial mortgage-backed securities ("CMBS")	524,441		31,435	(145	)	555,731
Residential mortgage-backed securities (“RMBS”)	1,389,985		44,710	(534	)	1,434,161
Total AFS fixed income securities	$	5,706,656	231,328	(7,747	)	5,930,237

December 31, 2018
($ in thousands)	Cost/ Amortized Cost		Unrealized Gains	Unrealized Losses		Fair Value
AFS fixed income securities:
U.S. government and government agencies	$	120,092	1,810	(592	)	121,310
Foreign government	23,202		36	(107	)	23,131
Obligations of states and political subdivisions	1,121,615		19,485	(2,631	)	1,138,469
Corporate securities	1,639,852		5,521	(27,965	)	1,617,408
CLO and other ABS	720,193		4,112	(6,943	)	717,362
CMBS	527,409		3,417	(3,748	)	527,078
RMBS	1,118,435		12,988	(3,081	)	1,128,342
Total AFS fixed income securities	$	5,270,798	47,369	(45,067	)	5,273,100

Unrealized gains and losses of AFS securities represent fair value fluctuations from the later of: (i) the date a security is designated as AFS; or (ii) the date that an other-than-temporary impairment ("OTTI") charge is recognized on an AFS security, through the date of the balance sheet. These unrealized gains and losses are recorded in AOCI on the Consolidated Balance Sheets.

(c) The severity of impairment on AFS securities in an unrealized/unrecognized loss position averaged approximately 1% of amortized cost at September 30, 2019 and approximately 2% at December 31, 2018. Quantitative information regarding these losses is provided below.

September 30, 2019	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	$	5,014	(11	)	498	(1	)	5,512	(12	)
Obligations of states and political subdivisions	437		(4	)	—	—		437	(4	)
Corporate securities	89,919		(1,862	)	15,867	(537	)	105,786	(2,399	)
CLO and other ABS	176,999		(2,458	)	180,898	(2,195	)	357,897	(4,653	)
CMBS	59,857		(126	)	7,665	(19	)	67,522	(145	)
RMBS	84,408		(503	)	9,513	(31	)	93,921	(534	)
Total AFS fixed income securities	$	416,634	(4,964	)	214,441	(2,783	)	631,075	(7,747	)

8

December 31, 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	$	6,693	(174	)	23,163	(418	)	29,856	(592	)
Foreign government	12,208		(93	)	1,482	(14	)	13,690	(107	)
Obligations of states and political subdivisions	196,798		(2,074	)	42,821	(557	)	239,619	(2,631	)
Corporate securities	1,041,952		(23,649	)	78,953	(4,316	)	1,120,905	(27,965	)
CLO and other ABS	516,106		(6,750	)	16,800	(193	)	532,906	(6,943	)
CMBS	229,338		(2,548	)	66,294	(1,200	)	295,632	(3,748	)
RMBS	139,338		(1,660	)	45,661	(1,421	)	184,999	(3,081	)
Total AFS fixed income securities	$	2,142,433	(36,948	)	275,174	(8,119	)	2,417,607	(45,067	)

  ¹ Gross unrealized losses include non-OTTI unrealized amounts and OTTI losses recognized in AOCI. 

The $37.3 million decrease in the unrealized loss position reflected: (i) lower interest rates, with an 87-basis point decrease in 2-year U.S. Treasury Note yields and a 102-basis point decrease in 10-year U.S. Treasury Note yields during Nine Months 2019; and (ii) tightening option adjusted corporate credit spreads, with a 38-basis point decrease in the Bloomberg Barclays U.S. Aggregate Corporate Bond Index during Nine Months 2019. We do not currently intend to sell any of the securities in the tables above, nor will we be required to sell any of these securities. Considering these factors, and in accordance with our review of these securities under our OTTI policy, as described in Note 2. “Summary of Significant Accounting Policies” within Item 8. “Financial Statements and Supplementary Data.” of our 2018 Annual Report, we have concluded that they are temporarily impaired as we believe: (i) they will mature at par value; (ii) they have not incurred a credit impairment; and (iii) future values of these securities will fluctuate with changes in interest rates. This conclusion reflects our current judgment as to the financial position and future prospects of the entity that issued the investment security and underlying collateral.

(d) Fixed income securities at September 30, 2019, by contractual maturity, are shown below. Mortgage-backed securities are included in the maturity tables using the estimated average life of each security. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations, with or without call or prepayment penalties.

Listed below are the contractual maturities of fixed income securities at September 30, 2019:

	AFS		HTM
($ in thousands)	Fair Value		Carrying Value	Fair Value
Due in one year or less	$	310,387	4,754	4,773
Due after one year through five years	3,296,126		16,334	17,589
Due after five years through 10 years	2,191,633		5,837	5,994
Due after 10 years	132,091		—	—
Total fixed income securities	$	5,930,237	26,925	28,356

(e) The following table summarizes our other investment portfolio by strategy:

Other Investments	September 30, 2019				December 31, 2018
($ in thousands)	Carrying Value		Remaining Commitment	Maximum Exposure to Loss1	Carrying Value	Remaining Commitment	Maximum Exposure to Loss1
Alternative Investments
Private equity	$	105,922	97,552	203,474	84,352	93,688	178,040
Private credit	37,710		109,797	147,507	41,682	81,453	123,135
Real assets	21,828		22,534	44,362	27,862	27,129	54,991
Total alternative investments	165,460		229,883	395,343	153,896	202,270	356,166
Other securities	23,783		—	23,783	25,042	—	25,042
Total other investments	$	189,243	229,883	419,126	178,938	202,270	381,208

¹The maximum exposure to loss includes both the carry value of these investments and the related remaining 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. 

We are contractually committed to make additional investments up to the remaining commitments outlined above; however, we do not have a future obligation to fund losses or debts on behalf of these investments. We have not provided any non-contractual financial support at any time during 2019 or 2018.

9

The following table sets forth gross summarized financial information for our other investments portfolio, including the portion not owned by us. The majority of these investments are carried under the equity method of accounting. The last line of the table below reflects our share of the aggregate income or loss, which is the portion included in our Financial Statements. As the majority of these investments report results to us on a one quarter lag, the summarized financial statement information for the three-month period ended June 30 is included in our Third Quarter results. This information is as follows:

Income Statement Information	Quarter ended September 30,				Nine Months ended September 30,
($ in millions)	2019			2018	2019	2018
Net investment (loss) income	$	(14.0	)	11.9	10.1	(29.9	)
Realized gains	121.1			124.8	370.4	1,348.3
Net change in unrealized appreciation (depreciation)	1,739.4			1,434.3	4,517.4	695.8
Net income	$	1,846.5		1,571.0	4,897.9	2,014.2
Insurance subsidiaries’ alternative investments income	$	5.2		7.1	13.0	10.6

(f) We have pledged certain AFS fixed income securities as collateral related to our relationships with the Federal Home Loan Bank of Indianapolis ("FHLBI") and the Federal Home Loan Bank of New York ("FHLBNY"). In addition, certain securities were on deposit with various state and regulatory agencies at September 30, 2019 to comply with insurance laws. We retain all rights regarding all securities pledged as collateral.

The following table summarizes the market value of these securities at September 30, 2019:

($ in millions)	FHLBI Collateral		FHLBNY Collateral	State and Regulatory Deposits	Total
U.S. government and government agencies	$	—	—	22.9	22.9
Obligations of states and political subdivisions	—		—	3.9	3.9
Corporate securities	—		—	0.3	0.3
CMBS	7.3		19.6	—	26.9
RMBS	57.4		81.1	—	138.5
Total pledged as collateral	$	64.7	100.7	27.1	192.5

(g) We did not have exposure to any credit concentration risk of a single issuer greater than 10% of our stockholders' equity, other than certain U.S. government-backed investments, as of September 30, 2019 or December 31, 2018.

(h) The components of pre-tax net investment income earned were as follows:

	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019		2018
Fixed income securities	$	50,749		45,088		150,689		130,903
Equity securities	1,885			2,079		5,265		5,876
Short-term investments	1,410			867		5,213		2,001
Other investments	5,267			7,211		13,421		10,868
Investment expenses	(3,485		)	(2,802	)	(9,639	)	(8,421	)
Net investment income earned	$	55,826		52,443		164,949		141,227

(i) OTTI charges were $2.3 million and $1.4 million in Third Quarter 2019 and Third Quarter 2018, respectively, and $3.4 million and $5.5 million in Nine Months 2019 and Nine Months 2018, respectively. All of these charges were related to securities for which we had the intent to sell. For a discussion of our evaluation for OTTI, refer to Note 2. "Summary of Significant Accounting Policies" in Item 8. "Financial Statements and Supplementary Data." of our 2018 Annual Report.

10

(j) Net realized and unrealized gains and losses (excluding OTTI charges) for Third Quarter 2019 and 2018 included the following:

	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019			2018
Net realized gains (losses) on the disposals of securities:
Fixed income securities	$	(1,141	)	(9,413	)	2,063			(13,922	)
Equity securities	21,602			8,665		24,733			17,960
Short-term investments	(36		)	2		(21		)	1
Other investments	—			(5	)	(23		)	(5	)
Net realized gains (losses) on the disposal of securities	20,425			(751	)	26,752			4,034
OTTI charges	(2,291		)	(1,426	)	(3,366		)	(5,459	)
Net realized gains (losses)	18,134			(2,177	)	23,386			(1,425	)
Unrealized (losses) recognized in income on equity securities	(20,317		)	(2,610	)	(8,091		)	(15,563	)
Total net realized and unrealized investment (losses) gains	$	(2,183	)	(4,787	)	$	15,295		(16,988	)

Unrealized (losses) recognized in income on equity securities, as reflected in the table above, include the following:

	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019			2018
Unrealized gains (losses) recognized in income on equity securities:
On securities remaining in our portfolio at September 30, 2019	$	1,109		5,476		1,805			4,199
On securities sold in each respective period	(21,426		)	(8,086	)	(9,896		)	(19,762	)
Total unrealized (losses) recognized in income on equity securities	$	(20,317	)	(2,610	)	$	(8,091	)	(15,563	)

The components of net realized gains on disposals of securities for the periods indicated were as follows:

	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019		2018
HTM fixed income securities
Gains	$	—		—		1		2
Losses	—			—		(15	)	—
AFS fixed income securities
Gains	1,078			462		5,565		5,056
Losses	(2,219		)	(9,875	)	(3,488	)	(18,980	)
Equity securities
Gains	21,630			10,584		24,868		20,209
Losses	(28		)	(1,919	)	(135	)	(2,249	)
Short-term investments
Gains	2			3		18		6
Losses	(38		)	(1	)	(39	)	(5	)
Other investments
Gains	—			—		7		—
Losses	—			(5	)	(30	)	(5	)
Total net realized gains on disposals of securities	$	20,425		(751	)	26,752		4,034

Realized gains and losses on the sale of investments are determined on the basis of the cost of the specific investments sold.

Proceeds from the sales of AFS fixed income securities were $89.7 million and $444.4 million in Third Quarter 2019 and Third Quarter 2018, respectively, and $461.8 million and $1,382.7 million in Nine Months 2019 and Nine Months 2018, respectively. Proceeds from the sales of equity securities were $95.2 million and $36.1 million in Third Quarter 2019 and Third Quarter 2018, respectively, and $125.3 million and $79.7 million in Nine Months 2019 and Nine Months 2018, respectively.

11

NOTE 5. Indebtedness

The table below provides a summary of our outstanding debt at September 30, 2019 and December 31, 2018:

Outstanding Debt	Issuance Date	Maturity Date	Interest Rate		Original Amount		2019	Carry Value
($ in thousands)							Debt Discount and Unamortized Issuance Costs	September 30, 2019	December 31, 2018
Description
Long term
Issuance:
Senior Notes	3/1/2019	3/1/2049	5.375	%	$	300,000	9,065	290,935	—
Redemption:
Senior Notes	2/8/2013	2/9/2043	5.875	%	185,000		—	—	180,771
Other Outstanding:
FHLBI	12/16/2016	12/16/2026	3.03	%	60,000		—	60,000	60,000
FHLBNY	8/15/2016	8/16/2021	1.56	%	25,000		—	25,000	25,000
FHLBNY	7/21/2016	7/21/2021	1.61	%	25,000		—	25,000	25,000
Senior Notes	11/3/2005	11/1/2035	6.70	%	100,000		889	99,111	99,069
Senior Notes	11/16/2004	11/15/2034	7.25	%	50,000		281	49,719	49,700
Finance lease obligations1								904	—
Total long-term debt							10,235	550,669	439,540

¹ Concurrent with the adoption of ASU 2016-02 discussed in Note 2. "Adoption of Accounting Pronouncements," finance lease obligations are now captured in Long-term debt on our Consolidated Balance Sheets.

Short-Term Debt Activity

Short-term debt activity included the following in Nine Months 2019:

• On March 7, 2019, Selective Insurance Company of America (“SICA”) borrowed short-term funds of $50 million from the FHLBNY at an interest rate of 2.64%. This borrowing was repaid on March 28, 2019.

• On August 5, 2019, SICA borrowed short-term funds of $15 million from the FHLBNY at an interest rate of 2.29%. This borrowing was repaid on August 12, 2019.

Long-Term Debt Activity

In the first quarter of 2019, we issued $300 million of 5.375% Senior Notes due 2049 at a discount of $5.9 million which, when coupled with debt issuance costs of approximately $3.3 million, resulted in net proceeds from the offering of $290.8 million. The 5.375% Senior Notes pay interest on March 1 and September 1 of each year. The first interest payment was made on September 1, 2019. A portion of the proceeds from this debt issuance was used to fully redeem the $185 million aggregate principal amount of our 5.875% Senior Notes due 2043, with the remaining $106 million being used for general corporate purposes. The 5.875% Senior Notes had pre-tax debt retirement costs of $4.2 million, or $3.3 million after tax, which was recorded in Interest expense on the Consolidated Statements of Income in the first quarter of 2019.

For detailed information on our indebtedness, see Note 10. "Indebtedness" in Item 8. "Financial Statements and Supplementary Data." of our 2018 Annual Report.

12

NOTE 6. Fair Value Measurements

The financial assets in our investment portfolio are primarily measured at fair value as disclosed on the Consolidated Balance Sheets. The following table presents the carrying amounts and estimated fair values of our financial liabilities as of September 30, 2019 and December 31, 2018:

	September 30, 2019			December 31, 2018
($ in thousands)	Carrying Amount		Fair Value	Carrying Amount		Fair Value
Financial Liabilities
Long-term debt:
7.25% Senior Notes	49,909		65,770	49,907		57,032
6.70% Senior Notes	99,476		125,954	99,462		107,075
5.875% Senior Notes	—		—	185,000		177,230
5.375% Senior Notes	294,136		352,156	—		—
1.61% borrowings from FHLBNY	25,000		24,838	25,000		24,218
1.56% borrowings from FHLBNY	25,000		24,808	25,000		24,162
3.03% borrowings from FHLBI	60,000		63,741	60,000		58,905
Subtotal long-term debt	553,521		657,267	444,369		448,622
Unamortized debt issuance costs	(3,756	)		(4,829	)
Finance lease obligations	904			—
Total long-term debt	550,669			439,540

For a discussion of our long-term debt activity in 2019, see Note 5. "Indebtedness" in this Form 10-Q, and for a discussion of the fair value hierarchy and techniques used to value our financial assets and liabilities, refer to Note 2. "Summary of Significant Accounting Policies" in Item 8. "Financial Statements and Supplementary Data." of our 2018 Annual Report.

The following tables provide quantitative disclosures of our financial assets that were measured and recorded at fair value at September 30, 2019 and December 31, 2018:

September 30, 2019			Fair Value Measurements Using
($ in thousands)	Assets Measured at Fair Value		Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)1	Significant Other  Observable Inputs  (Level 2)1	Significant Unobservable  Inputs  (Level 3)
Description
Measured on a recurring basis:
AFS fixed income securities:
U.S. government and government agencies	$	120,900	41,619	79,281	—
Foreign government	21,520		—	21,520	—
Obligations of states and political subdivisions	1,190,615		—	1,190,615	—
Corporate securities	1,838,927		—	1,822,577	16,350
CLO and other ABS	768,383		—	748,504	19,879
CMBS	555,731		—	555,731	—
RMBS	1,434,161		—	1,434,161	—
Total AFS fixed income securities	5,930,237		41,619	5,852,389	36,229
Equity securities:
Common stock2	76,179		42,988	—	—
Preferred stock	3,034		3,034	—	—
Total equity securities	79,213		46,022	—	—
Short-term investments	326,121		319,599	6,522	—
Total assets measured at fair value	$	6,335,571	407,240	5,858,911	36,229

13

December 31, 2018			Fair Value Measurements Using
($ in thousands)	Assets Measured at Fair Value		Quoted Prices in  Active Markets for Identical Assets/Liabilities (Level 1)1	Significant Other Observable Inputs  (Level 2)1	Significant Unobservable Inputs  (Level 3)
Description
Measured on a recurring basis:
AFS fixed income securities:
U.S. government and government agencies	$	121,310	78,381	42,929	—
Foreign government	23,131		—	23,131	—
Obligations of states and political subdivisions	1,138,469		—	1,138,469	—
Corporate securities	1,617,408		—	1,617,408	—
CLO and other ABS	717,362		—	709,953	7,409
CMBS	527,078		—	527,078	—
RMBS	1,128,342		—	1,128,342	—
Total AFS fixed income securities	5,273,100		78,381	5,187,310	7,409
Equity securities:
Common stock2	144,727		107,397	—	—
Preferred stock	2,912		2,912	—	—
Total equity securities	147,639		110,309	—	—
Short-term investments	323,864		321,370	2,494	—
Total assets measured at fair value	$	5,744,603	510,060	5,189,804	7,409

¹  There were no transfers of securities between Level 1 and Level 2.

²  Investments amounting to $33.2 million at September 30, 2019, and $37.3 million at December 31, 2018, were measured at fair value using net asset value per share (or its practical expedient) and have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to total assets measured at fair value.

The following table provides a summary of Level 3 changes in Nine Months 2019:

September 30, 2019
($ in thousands)	Corporate Securities		CLO and Other ABS		Total
Fair value, December 31, 2018	—		7,409		7,409
Total net (losses) gains for the period included in:
OCI	(69	)	(14	)	(83	)
Net income	—		244		244
Purchases	—		18,404		18,404
Sales	—		—		—
Issuances	—		—		—
Settlements	—		(105	)	(105	)
Transfers into Level 3	16,419		13,603		30,022
Transfers out of Level 3	—		(19,662	)	(19,662	)
Fair value, September 30, 2019	16,350		19,879		36,229

There were no material changes in the fair value of securities measured using Level 3 prices in Nine Months 2018.

14

The following tables provide quantitative information regarding our financial assets and liabilities that were disclosed at fair value at September 30, 2019 and December 31, 2018:

September 30, 2019			Fair Value Measurements Using
($ in thousands)	Assets/ Liabilities Disclosed at Fair Value		Quoted Prices in  Active Markets for  Identical Assets/ Liabilities (Level 1)	Significant Other Observable Inputs (Level 2)	Significant Unobservable Inputs (Level 3)
Financial Assets
HTM:
Obligations of states and political subdivisions	$	9,426	—	9,426	—
Corporate securities	18,930		—	18,930	—
Total HTM fixed income securities	$	28,356	—	28,356	—
Financial Liabilities
Long-term debt:
7.25% Senior Notes	$	65,770	—	65,770	—
6.70% Senior Notes	125,954		—	125,954	—
5.375% Senior Notes	352,156		—	352,156	—
1.61% borrowings from FHLBNY	24,838		—	24,838	—
1.56% borrowings from FHLBNY	24,808		—	24,808	—
3.03% borrowings from FHLBI	63,741		—	63,741	—
Total long-term debt	$	657,267	—	657,267	—

December 31, 2018			Fair Value Measurements Using
($ in thousands)	Assets/ Liabilities Disclosed at Fair Value		Quoted Prices in  Active Markets for  Identical Assets/ Liabilities (Level 1)	Significant Other Observable Inputs (Level 2)	Significant Unobservable Inputs (Level 3)
Financial Assets
HTM:
Obligations of states and political subdivisions	$	17,969	—	17,969	—
Corporate securities	20,348		—	20,348	—
Total HTM fixed income securities	$	38,317	—	38,317	—
Financial Liabilities
Long-term debt:
7.25% Senior Notes	$	57,032	—	57,032	—
6.70% Senior Notes	107,075		—	107,075	—
5.875% Senior Notes	177,230		177,230	—	—
1.61% borrowings from FHLBNY	24,218		—	24,218	—
1.56% borrowings from FHLBNY	24,162		—	24,162	—
3.03% borrowings from FHLBI	58,905		—	58,905	—
Total long-term debt	$	448,622	177,230	271,392	—

15

NOTE 7. Reinsurance

The following table contains a listing of direct, assumed, and ceded reinsurance amounts for premiums written, premiums earned, and loss and loss expenses incurred for the periods indicated. For more information concerning reinsurance, refer to

Note 8. “Reinsurance” in Item 8. “Financial Statements and Supplementary Data.” of our 2018 Annual Report.

	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019			2018
Premiums written:
Direct	$	785,680		752,834		$	2,359,441		2,220,431
Assumed	6,882			7,084		18,770			19,891
Ceded	(115,634		)	(108,250	)	(326,939		)	(308,846	)
Net	$	676,928		651,668		$	2,051,272		1,931,476
Premiums earned:
Direct	$	752,872		706,497		$	2,221,257		2,086,953
Assumed	6,356			6,484		18,660			19,220
Ceded	(105,608		)	(98,704	)	(311,105		)	(295,232	)
Net	$	653,620		614,277		$	1,928,812		1,810,941
Loss and loss expenses incurred:
Direct	$	437,618		477,427		$	1,297,975		1,289,357
Assumed	4,362			6,529		13,975			16,897
Ceded	(43,305		)	(104,757	)	(145,712		)	(175,786	)
Net	$	398,675		379,199		$	1,166,238		1,130,468

Ceded premiums and losses related to our participation in the NFIP, under which 100% of our flood premiums, losses, and loss expenses are ceded to the NFIP, are as follows:

Ceded to NFIP	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019			2018
Ceded premiums written	$	(74,864	)	(70,100	)	$	(206,451	)	(193,110	)
Ceded premiums earned	(65,847		)	(61,448	)	(191,914		)	(180,582	)
Ceded loss and loss expenses incurred	(27,459		)	(89,396	)	(62,208		)	(115,376	)

Excluding the impact of our participation in the NFIP, ceded loss and loss expenses incurred increased in Nine Months 2019 compared to the respective prior year, due to one significant fire loss in the second quarter of 2019, which added $17.4 million to ceded loss and loss expenses. The elevated ceded loss and loss expenses incurred related to our participation in the NFIP in Third Quarter and Nine Months 2018 were due to Hurricane Florence, which impacted our footprint in September 2018.

NOTE 8. Reserve for Loss and Loss Expense

The table below provides a roll forward of reserve for loss and loss expense balances:

	Nine Months ended September 30,
($ in thousands)	2019			2018
Gross reserve for loss and loss expense, at beginning of year	$	3,893,868		3,771,240
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year	537,388			585,855
Net reserve for loss and loss expense, at beginning of year	3,356,480			3,185,385
Incurred loss and loss expense for claims occurring in the:
Current year	1,200,878			1,148,032
Prior years	(34,640		)	(17,564	)
Total incurred loss and loss expense	1,166,238			1,130,468
Paid loss and loss expense for claims occurring in the:
Current year	384,436			369,036
Prior years	631,589			610,734
Total paid loss and loss expense	1,016,025			979,770
Net reserve for loss and loss expense, at end of period	3,506,693			3,336,083
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period	548,938			589,072
Gross reserve for loss and loss expense at end of period	$	4,055,631		3,925,155

Prior year reserve development in Nine Months 2019 of $34.6 million included $41.0 million of favorable casualty reserve development, partially offset by $6.4 million of unfavorable property reserve development. The favorable casualty reserve development included $33.0 million in our workers compensation line of business and $10.0 million in our general liability line

16

of business, partially offset by $2.0 million of unfavorable casualty reserve development in our personal automobile line of business.

Prior year reserve development in Nine Months 2018 of $17.6 million included $24.0 million of favorable casualty reserve development, partially offset by $6.4 million of unfavorable property reserve development. The favorable casualty reserve development included $53.0 million of development in our workers compensation line of business and $8.0 million in our general liability line of business, partially offset by $25.0 million of unfavorable casualty reserve development in our commercial automobile line of business and $12.0 million in our excess and surplus ("E&S") casualty lines.

NOTE 9. Segment Information

The results of our four reportable segments are evaluated as follows:

• Our Standard Commercial Lines, Standard Personal Lines, and E&S Lines are evaluated based on before and after-tax underwriting results (net premiums earned, incurred loss and loss expense, policyholder dividends, policy acquisition costs, and other underwriting expenses), return on equity ("ROE") contribution, and combined ratios.

• Our Investments segment is primarily evaluated based on after-tax net investment income and its ROE contribution. Also included in Investment segment results are after-tax net realized and unrealized gains and losses, which are not included in non-GAAP operating income.

In computing the results of each segment, we do not make adjustments for interest expense or corporate expenses. We do not maintain separate investment portfolios for the segments and therefore, do not allocate assets to the segments.

The following summaries present revenues (net investment income and net realized and unrealized gains on investments in the case of the Investments segment) and pre-tax income for the individual segments:

Revenue by Segment	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019	2018
Standard Commercial Lines:
Net premiums earned:
Commercial automobile	$	141,182		124,862		408,706	365,197
Workers compensation	75,478			78,784		232,657	237,628
General liability	169,084			154,974		495,402	457,805
Commercial property	89,215			83,056		262,418	245,544
Businessowners’ policies	26,371			25,994		78,624	77,414
Bonds	8,990			8,778		26,861	25,247
Other	4,841			4,608		14,326	13,597
Miscellaneous income	2,782			2,228		7,544	6,936
Total Standard Commercial Lines revenue	517,943			483,284		1,526,538	1,429,368
Standard Personal Lines:
Net premiums earned:
Personal automobile	43,226			42,772		129,777	125,024
Homeowners	31,529			32,293		95,672	96,717
Other	1,983			2,092		5,709	5,349
Miscellaneous income	380			310		991	959
Total Standard Personal Lines revenue	77,118			77,467		232,149	228,049
E&S Lines:
Net premiums earned:
Casualty lines	47,171			42,179		136,455	120,098
Property lines	14,550			13,885		42,205	41,321
Miscellaneous income	—			—		—	1
Total E&S Lines revenue	61,721			56,064		178,660	161,420
Investments:
Net investment income	55,826			52,443		164,949	141,227
Net realized and unrealized investment (losses) gains	(2,183		)	(4,787	)	15,295	(16,988	)
Total Investments revenue	53,643			47,656		180,244	124,239
Total revenues	$	710,425		664,471		2,117,591	1,943,076

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Income Before and After Federal Income Tax	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019	2018
Standard Commercial Lines:
Underwriting gain, before federal income tax	$	30,016		26,333		92,974	74,153
Underwriting gain, after federal income tax	23,713			20,803		73,450	58,581
Combined ratio	94.2		%	94.5		93.9	94.8
ROE contribution	4.5			4.9		5.0	4.5
Standard Personal Lines:
Underwriting (loss) gain, before federal income tax	$	(631	)	3,158		7,074	6,457
Underwriting (loss) gain, after federal income tax	(499		)	2,495		5,588	5,101
Combined ratio	100.8		%	95.9		96.9	97.2
ROE contribution	(0.1		)	0.6		0.4	0.4
E&S Lines:
Underwriting gain (loss), before federal income tax	$	1,916		3,506		9,439	(4,848	)
Underwriting gain (loss), after federal income tax	1,514			2,770		7,457	(3,830	)
Combined ratio	96.9		%	93.7		94.7	103.0
ROE contribution	0.3			0.6		0.5	(0.3	)
Investments:
Net investment income	$	55,826		52,443		164,949	141,227
Net realized and unrealized investment (losses) gains	(2,183		)	(4,787	)	15,295	(16,988	)
Total investment segment income, before federal income tax	53,643			47,656		180,244	124,239
Tax on investment segment income	10,884			8,562		34,733	21,405
Total investment segment income, after federal income tax	$	42,759		39,094		145,511	102,834
ROE contribution of after-tax net investment income	8.6			10.0		9.1	9.0

Reconciliation of Segment Results to Income Before Federal Income Tax	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019		2018
Underwriting gain (loss)
Standard Commercial Lines	$	30,016		26,333		92,974		74,153
Standard Personal Lines	(631		)	3,158		7,074		6,457
E&S Lines	1,916			3,506		9,439		(4,848	)
Investment income	53,643			47,656		180,244		124,239
Total all segments	84,944			80,653		289,731		200,001
Interest expense	(7,397		)	(6,073	)	(26,289	)	(18,350	)
Corporate expenses	(6,369		)	(7,450	)	(28,345	)	(22,065	)
Income, before federal income tax	$	71,178		67,130		235,097		159,586

NOTE 10. Retirement Plans

SICA's primary pension plan is the Retirement Income Plan for Selective Insurance Company of America (the “Pension Plan”). SICA also sponsors the Supplemental Excess Retirement Plan (the “Excess Plan”) and a life insurance benefit plan. All plans are closed to new entrants and benefits ceased accruing under the Pension Plan and the Excess Plan after March 31, 2016. For more information concerning SICA's retirement plans, refer to Note 14. “Retirement Plans” in Item 8. “Financial Statements and Supplementary Data.” of our 2018 Annual Report.

The following tables provide information regarding the Pension Plan:

	Pension Plan					Pension Plan
	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019		2018
Net Periodic Pension Cost (Benefit):
Interest cost	$	3,376		3,095		10,129		9,285
Expected return on plan assets	(5,278		)	(5,681	)	(15,835	)	(17,044	)
Amortization of unrecognized net actuarial loss	644			494		1,931		1,481
Total net periodic pension cost (benefit)1	$	(1,258	)	(2,092	)	(3,775	)	(6,278	)

¹ The components of net periodic pension cost (benefit) are included within "Loss and loss expense incurred" and "Other insurance expenses" on the Consolidated Statements of Income.

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	Pension Plan
	Nine Months ended September 30,
	2019		2018
Weighted-Average Expense Assumptions:
Discount rate	4.46	%	3.78	%
Effective interest rate for calculation of interest cost	4.12		3.46
Expected return on plan assets	6.50		6.36

NOTE 11. Comprehensive Income

The components of comprehensive income, both gross and net of tax, for Third Quarter and Nine Months 2019 and Third Quarter and Nine Months 2018 were as follows:

Third Quarter 2019
($ in thousands)	Gross			Tax		Net
Net income	$	71,178		15,028		56,150
Components of OCI:
Unrealized gains on investment securities:
Unrealized holding gains during the period	34,392			7,224		27,168
Amounts reclassified into net income:
HTM securities	(3		)	(1	)	(2	)
Realized losses on disposals and OTTI of AFS securities	2,821			592		2,229
Total unrealized gains on investment securities	37,210			7,815		29,395
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	665			140		525
Total defined benefit pension and post-retirement plans	665			140		525
Other comprehensive income	37,875			7,955		29,920
Comprehensive income	$	109,053		22,983		86,070
Third Quarter 2018
($ in thousands)	Gross			Tax		Net
Net income	$	67,130		11,695		55,435
Components of other comprehensive loss:
Unrealized losses on investment securities:
Unrealized holding losses during the period	(21,565		)	(4,529	)	(17,036	)
Amounts reclassified into net income:
HTM securities	(8		)	(2	)	(6	)
Realized losses on disposals and OTTI of AFS securities	10,839			2,276		8,563
Total unrealized losses on investment securities	(10,734		)	(2,255	)	(8,479	)
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	532			112		420
Total defined benefit pension and post-retirement plans	532			112		420
Other comprehensive loss	(10,202		)	(2,143	)	(8,059	)
Comprehensive income	$	56,928		9,552		47,376

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Nine Months 2019
($ in thousands)	Gross			Tax		Net
Net income	$	235,097		45,333		189,764
Components of OCI:
Unrealized gains on investment securities:
Unrealized holding gains during the period	220,864			46,381		174,483
Amounts reclassified into net income:
HTM securities	(33		)	(7	)	(26	)
Realized losses on disposals and OTTI of AFS securities	444			93		351
Total unrealized gains on investment securities	221,275			46,467		174,808
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	1,993			419		1,574
Total defined benefit pension and post-retirement plans	1,993			419		1,574
Other comprehensive income	223,268			46,886		176,382
Comprehensive income	$	458,365		92,219		366,146
Nine Months 2018
($ in thousands)	Gross			Tax		Net
Net income	$	159,586		26,407		133,179
Components of other comprehensive loss:
Unrealized losses on investment securities:
Unrealized holding losses during the period	(130,873		)	(27,484	)	(103,389	)
Amounts reclassified into net income:
HTM securities	(28		)	(6	)	(22	)
Realized losses on disposals and OTTI of AFS securities	18,258			3,834		14,424
Total unrealized losses on investment securities	(112,643		)	(23,656	)	(88,987	)
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	1,595			335		1,260
Total defined benefit pension and post-retirement plans	1,595			335		1,260
Other comprehensive loss	(111,048		)	(23,321	)	(87,727	)
Comprehensive income	$	48,538		3,086		45,452

The balances of, and changes in, each component of AOCI (net of taxes) as of September 30, 2019 were as follows:

September 30, 2019								Defined Benefit Pension and Post-Retirement Plans
	Net Unrealized Gains (Losses) on Investment Securities									Total AOCI
($ in thousands)	OTTI Related			HTM Related		All Other	Investments Subtotal
Balance, December 31, 2018	$	(71	)	71		1,888	1,888	(79,844	)	(77,956	)
OCI before reclassifications	—			—		174,483	174,483	—		174,483
Amounts reclassified from AOCI	—			(26	)	351	325	1,574		1,899
Net current period OCI	—			(26	)	174,834	174,808	1,574		176,382
Balance, September 30, 2019	$	(71	)	45		176,722	176,696	(78,270	)	98,426

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The reclassifications out of AOCI were as follows:

	Quarter ended September 30,					Nine Months ended September 30,				Affected Line Item in the Unaudited Consolidated Statements of Income
($ in thousands)	2019			2018		2019		2018
HTM related
Unrealized (gains) losses on HTM disposals	$	(3	)	11		(12	)	5		Net realized and unrealized (losses) gains
Amortization of net unrealized gains on HTM securities	—			(19	)	(21	)	(33	)	Net investment income earned
	(3		)	(8	)	(33	)	(28	)	Income before federal income tax
	1			2		7		6		Total federal income tax expense
	(2		)	(6	)	(26	)	(22	)	Net income
Realized losses on AFS and OTTI
Realized losses on AFS disposals and OTTI	2,821			10,839		444		18,258		Net realized and unrealized (losses) gains
	2,821			10,839		444		18,258		Income before federal income tax
	(592		)	(2,276	)	(93	)	(3,834	)	Total federal income tax expense
	2,229			8,563		351		14,424		Net income
Defined benefit pension and post-retirement life plans
Net actuarial loss	146			112		436		337		Loss and loss expense incurred
	519			420		1,557		1,258		Other insurance expenses
Total defined benefit pension and post-retirement life	665			532		1,993		1,595		Income before federal income tax
	(140		)	(112	)	(419	)	(335	)	Total federal income tax expense
	525			420		1,574		1,260		Net income
Total reclassifications for the period	$	2,752		8,977		1,899		15,662		Net income

NOTE 12. Leases

We have various operating leases for office space, equipment, and fleet vehicles. In addition, we have various finance leases for computer hardware. Such lease agreements, which expire at various dates through 2030, are generally renewed or replaced by similar leases.

We determine if an arrangement is a lease on the commencement date of the contract. Lease assets represent our right to use an underlying asset for the lease term, and lease liabilities represent our obligation to make lease payments arising from the lease. The lease asset and liability are measured by the present value of the future minimum lease payments over the lease term. Our fleet vehicle leases include a residual value guarantee; however, it is not probable of being owed. Therefore, there is no impact to the lease liability or lease asset. To measure the present value, the discount rate available in the contract is used. If the discount rate is not readily determinable, our incremental borrowing rate is used. The lease asset is then adjusted to exclude lease incentives. We recognize variable lease payments in the period in which the obligation for those payments is incurred. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Lease expense is calculated using the straight-line method.

Upon adoption of ASU 2016-02 on January 1, 2019, we recorded operating lease right-of-use assets of $20.7 million with related lease liabilities of $21.0 million. The differential of $0.3 million was recognized, on an after-tax basis, as a cumulative-effect adjustment to the opening balance of retained earnings as of January 1, 2019. Financing lease right-of-use assets and the related lease liabilities were $0.9 million as of January 1, 2019. See Note 2. "Adoption of Accounting Pronouncements" in this Form 10-Q for additional information regarding ASU 2016-02 and accounting policy elections made.

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The components of lease expense in Third Quarter and Nine Months 2019 were as follows:

($ in thousands)	Quarter ended September 30, 2019			Nine Months ended September 30, 2019
Operating lease cost, included in Other insurance expenses on the Consolidated Statements of Income	$	2,234		6,631
Finance lease cost:
Amortization of assets, included in Other insurance expenses on the Consolidated Statements of Income	217			816
Interest on lease liabilities, included in Interest expense on the Consolidated Statements of Income	5			12
Total finance lease cost	222			828
Variable lease cost, included in Other insurance expenses on the Consolidated Statements of Income	(548		)	120
Short-term lease cost, included in Other insurance expenses on the Consolidated Statements of Income	502			1,677

The following table provides supplemental information regarding our operating and finance leases.

	September 30, 2019
Weighted-average remaining lease term
Operating leases	6	years
Finance leases	2
Weighted-average discount rate
Operating leases	3.4	%
Finance leases1	2.0

¹Prior to adoption of ASU 2016-02, our historical capital lease liability and asset were measured using an un-discounted cash flow stream due to immateriality of the capital lease population.

Operating and finance lease asset and liability balances are included within the following line items on the Consolidated Balance Sheets:

($ in thousands)	September 30, 2019
Operating leases
Other assets	$	28,348
Other liabilities	29,218
Finance leases
Property and equipment - at cost, net of accumulated depreciation and amortization	899
Long-term debt	904

At September 30, 2019, the maturities of our lease liabilities were as follows:

($ in thousands)	Finance Leases		Operating Leases	Total
Year ended December 31,
2019 (excluding the nine months ended September 30, 2019)	$	171	2,071	2,242
2020	451		8,164	8,615
2021	248		6,033	6,281
2022	54		4,443	4,497
2023	—		3,232	3,232
Thereafter	—		11,446	11,446
Total lease payments	924		35,389	36,313
Less: imputed interest	20		3,230	3,250
Less: leases that have not yet commenced	—		2,941	2,941
Total lease liabilities	$	904	29,218	30,122

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At December 31, 2018, the maturities of our lease liabilities for capital and operating leases were as follows:

($ in thousands)	Capital Leases		Operating Leases	Total
2019	$	728	7,762	8,490
2020	141		7,355	7,496
2021	22		5,083	5,105
2022	—		3,641	3,641
2023	—		2,900	2,900
Thereafter	—		9,698	9,698
Total minimum payment required	$	891	36,439	37,330

Refer to Note. 3 "Statements of Cash Flows" in this Form 10-Q for supplemental cash and non-cash transactions included in the measurement of operating and finance lease liabilities.

NOTE 13. Litigation

In the ordinary course of conducting business, we can be named as defendants in various legal actions. Most are claims litigation involving our Insurance Subsidiaries as either: (i) liability insurers defending or providing indemnity for third-party claims brought against our customers; or (ii) insurers defending first-party coverage claims brought against them. We account for such activity through the establishment of unpaid loss and loss expense reserves. In ordinary course claims litigation, we expect that any potential ultimate liability, after consideration of provisions made for potential losses and costs of defense, will not be material to our consolidated financial condition, results of operations, or cash flows.

From time to time, our Insurance Subsidiaries also are named as defendants in other legal actions, some of which assert claims for substantial amounts. Plaintiffs may style these actions as putative class actions and seek judicial certification of a state or national class for allegations such as improper reimbursement of medical providers paid under workers compensation and personal and commercial automobile insurance policies or improper reimbursement for automobile parts. Similarly, our Insurance Subsidiaries can be named in individual actions seeking extra-contractual damages, punitive damages, or penalties, often alleging bad faith in the handling of insurance claims. We believe that we have valid defenses to these allegations and we account for such activity through the establishment of unpaid loss and loss expense reserves. In these other legal actions, we expect that any potential ultimate liability, after consideration of provisions made for estimated losses, will not be material to our consolidated financial condition. Nonetheless, litigation outcomes are inherently unpredictable and, because the amounts sought in certain of these actions are large or indeterminate, it is possible that any adverse outcomes could have a material adverse effect on our consolidated results of operations or cash flows in particular quarterly or annual periods.

As of September 30, 2019, we do not believe we are involved in any legal action that could have a material adverse effect on our consolidated financial condition, results of operations, or cash flows.

ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.

Forward-Looking Statements

As used herein, the "Company," "we," "us," or "our" refers to Selective Insurance Group, Inc. (the "Parent"), and its subsidiaries, except as expressly indicated or unless the context otherwise requires. In this Quarterly Report on Form 10-Q, we discuss and make statements regarding our intentions, beliefs, current expectations, and projections regarding our company’s future operations and performance. Such statements are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are often identified by words such as “anticipates,” “believes,” “expects,” “will,” “should,” and “intends” and their negatives. We caution prospective investors that such forward-looking statements are not guarantees of future performance. Risks and uncertainties are inherent in our future performance. Factors that could cause actual results to differ materially from those indicated by such forward-looking statements include, but are not limited to, those discussed under Item 1A. “Risk Factors” below in Part II. “Other Information.” These risk factors may not be exhaustive. We operate in a continually changing business environment and new risk factors emerge from time to time. We can neither predict such new risk factors nor can we assess the impact, if any, of such new risk factors on our businesses or the extent to which any factor or combination of factors may cause actual results to differ materially from those expressed or implied in any forward-looking statements in this report. In light of these risks, uncertainties, and assumptions, the forward-looking events discussed in this report might not occur. We make forward-looking statements based on currently available information and assume no obligation to update these statements due to changes in underlying factors, new information, future developments, or otherwise.

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Introduction

The Parent, through its ten insurance subsidiaries, collectively referred to as the "Insurance Subsidiaries," offers property and casualty insurance products in the standard and excess and surplus ("E&S") marketplaces. We classify our business into four reportable segments, which are as follows:

• Standard Commercial Lines;

• Standard Personal Lines;

• E&S Lines; and

• Investments.

For further details regarding these segments, refer to Note 9. "Segment Information" in Item 1. "Financial Statements." of this Form 10-Q and Note 11. "Segment Information" in Item 8. "Financial Statements and Supplementary Data." of our Annual Report on Form 10-K for the year ended December 31, 2018 ("2018 Annual Report").

Our Standard Commercial and Standard Personal Lines products and services are written through nine of our Insurance Subsidiaries, some of which write flood business through the Write Your Own ("WYO") program of the National Flood Insurance Program ("NFIP"). Our E&S products and services are written through one subsidiary, Mesa Underwriters Specialty Insurance Company. This subsidiary provides us with a nationally-authorized non-admitted platform to offer insurance products and services to customers who have not obtained coverage in the standard marketplace.

The following is Management’s Discussion and Analysis (“MD&A”) of the consolidated results of operations and financial condition, as well as known trends and uncertainties, that may have a material impact in future periods. Consequently, investors should read the MD&A in conjunction with Item 1. "Financial Statements." of this Form 10-Q and the consolidated financial statements in our 2018 Annual Report filed with the U.S. Securities and Exchange Commission. Within this MD&A, all prior year amounts for non-catastrophe property losses, and the related ratios, have been adjusted to include the related loss expenses, which is consistent with the current year presentation.

In the MD&A, we will discuss and analyze the following:

• Critical Accounting Policies and Estimates;

• Financial Highlights of Results for the third quarters ended September 30, 2019 (“Third Quarter 2019”) and September 30, 2018 (“Third Quarter 2018”) and the nine-month periods ended September 30, 2019 (“Nine Months 2019”) and September 30, 2018 (“Nine Months 2018”);

• Results of Operations and Related Information by Segment;

• Federal Income Taxes;

• Financial Condition, Liquidity, and Capital Resources;

• Ratings;

• Off-Balance Sheet Arrangements; and

• Contractual Obligations, Contingent Liabilities, and Commitments.

Critical Accounting Policies and Estimates

Our unaudited interim consolidated financial statements include amounts based on our informed estimates and judgments for those transactions that are not yet complete. Such estimates and judgments affect the reported amounts in the consolidated financial statements. Those estimates and judgments that were most critical to the preparation of the consolidated financial statements involved the following: (i) reserves for loss and loss expense; (ii) pension and post-retirement benefit plan actuarial assumptions; (iii) investment valuation and other-than-temporary-impairments ("OTTI"); and (iv) reinsurance. These estimates and judgments require the use of assumptions about matters that are highly uncertain and, therefore, are subject to change as facts and circumstances develop. If different estimates and judgments had been applied, materially different amounts might have been reported in the financial statements. For additional information regarding our critical accounting policies, refer to pages 37 through 46 of our 2018 Annual Report.

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Financial Highlights of Results for Third Quarter and Nine Months 2019 and Third Quarter and Nine Months 2018¹ 

($ and shares in thousands, except per share amounts)	Quarter ended September 30,				Change % or Points			Nine Months ended September 30,				Change % or Points
	2019			2018				2019			2018
Revenues	$	710,425		664,471	7		%	$	2,117,591		1,943,076	9		%
After-tax net investment income	45,374			42,875	6			134,319			116,254	16
After-tax underwriting income	24,728			26,068	(5	)		86,495			59,852	45
Net income before federal income tax	71,178			67,130	6			235,097			159,586	47
Net income	56,150			55,435	1			189,764			133,179	42
Diluted net income per share	0.93			0.93	—			3.16			2.23	42
Diluted weighted-average outstanding shares	60,057			59,711	1			59,960			59,626	1
Combined ratio	95.2		%	94.6	0.6		pts	94.3		%	95.8	(1.5	)	pts
Invested assets per dollar of stockholders' equity	$	3.07		3.37	(9	)	%	$	3.07		3.37	(9	)	%
After-tax yield on investments	2.8		%	3.0	(0.2	)	pts	2.9		%	2.7	0.2		pts
Book value per share	$	35.98		29.52	22		%	$	35.98		29.52	22		%
Dividends declared per share to stockholders	0.20			0.18	11			0.60			0.54	11
Annualized return on equity ("ROE")	10.7			12.9	(2.2	)	pts	12.9			10.3	2.6		pts
Non-Generally Accepted Accounting Principles ("GAAP") operating income2	$	58,765		59,216	(1	)	%	$	181,870		146,599	24		%
Diluted non-GAAP operating income per share2	0.97			0.99	(2	)		3.02			2.46	23
Annualized non-GAAP operating ROE2	11.2		%	13.8	(2.6	)	pts	12.3		%	11.3	1.0		pts

¹  Refer to the Glossary of Terms attached to our 2018 Annual Report as Exhibit 99.1 for definitions of terms used in this Form 10-Q.

²  Non-GAAP operating income is used as an important financial measure by us, analysts, and investors, because the realization of net investment gains and losses on sales of securities in any given period is largely discretionary as to timing. In addition, these net realized investment gains and losses, OTTI that are charged to earnings, unrealized gains and losses on equity securities, and the debt retirement costs could distort the analysis of trends.

Reconciliations of net income, net income per diluted share, and annualized ROE to non-GAAP operating income, non-GAAP operating income per diluted share, and annualized non-GAAP operating ROE, respectively, are provided in the tables below:

Reconciliation of net income to non-GAAP operating income	Quarter ended September 30,				Nine Months ended September 30,
($ in thousands)	2019		2018		2019		2018
Net income	$	56,150	55,435		189,764		133,179
Net realized and unrealized losses (gains), before tax	2,183		4,787		(15,295	)	16,988
Debt retirement costs, before tax	—		—		4,175		—
Tax on reconciling items	432		(1,006	)	3,226		(3,568	)
Non-GAAP operating income	$	58,765	59,216		181,870		146,599

Reconciliation of net income per diluted share to non-GAAP operating income per diluted share	Quarter ended September 30,				Nine Months ended September 30,
	2019		2018		2019		2018
Net income per diluted share	$	0.93	0.93		3.16		2.23
Net realized and unrealized losses (gains), before tax	0.04		0.08		(0.26	)	0.28
Debt retirement costs, before tax	—		—		0.07		—
Tax on reconciling items	—		(0.02	)	0.05		(0.05	)
Non-GAAP operating income per diluted share	$	0.97	0.99		3.02		2.46

Reconciliation of annualized ROE to annualized non-GAAP operating ROE	Quarter ended September 30,				Nine Months ended September 30,
	2019		2018		2019		2018
Annualized ROE	10.7	%	12.9		12.9		10.3
Net realized and unrealized losses (gains), before tax	0.4		1.1		(1.0	)	1.3
Debt retirement costs, before tax	—		—		0.3		—
Tax on reconciling items	0.1		(0.2	)	0.1		(0.3	)
Annualized non-GAAP operating ROE	11.2	%	13.8		12.3		11.3

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The components of our annualized ROE are as follows:

Annualized ROE Components	Quarter ended September 30,				Change Points		Nine Months ended September 30,				Change Points
	2019		2018				2019		2018
Standard Commercial Lines Segment	4.5	%	4.9		(0.4	)	5.0		4.5		0.5
Standard Personal Lines Segment	(0.1	)	0.6		(0.7	)	0.4		0.4		—
E&S Lines Segment	0.3		0.6		(0.3	)	0.5		(0.3	)	0.8
Total insurance operations	4.7		6.1		(1.4	)	5.9		4.6		1.3
Investment income	8.6		10.0		(1.4	)	9.1		9.0		0.1
Net realized and unrealized (losses) gains	(0.5	)	(0.9	)	0.4		0.8		(1.0	)	1.8
Total investments segment	8.1		9.1		(1.0	)	9.9		8.0		1.9
Other	(2.1	)	(2.3	)	0.2		(2.9	)	(2.3	)	(0.6	)
Annualized ROE	10.7	%	12.9		(2.2	)	12.9		10.3		2.6

In Third Quarter 2019, we generated net income per diluted share of $0.93, in line with the same quarter a year ago. Non-GAAP operating income per diluted share was $0.97, compared to $0.99 a year ago. The Third Quarter 2019 results were impacted by: (i) higher than expected levels of non-catastrophe property loss and loss expenses of $5 million, after-tax, or $0.09 per diluted share; and (ii) $3 million of after-tax employee severance-related expenses, split between underwriting and corporate expenses on the Consolidated Statements of Income, that accounted for $0.05 per diluted share. On a year-to-date basis, non-catastrophe property loss and loss expenses were generally in line with expected levels.

We generated 18% growth in book value per share through Nine Months 2019. The strong growth in book value per share was driven by net income and appreciation in the value of our fixed income securities portfolio, which experienced net unrealized after-tax gains of approximately $29 million during Third Quarter 2019 and $175 million during Nine Months 2019. This growth was partially offset by dividends paid to shareholders.

In addition to strong growth in book value per share, the financial results this year continue to build on our five-year track record of consistently generating double-digit non-GAAP operating ROEs on an annual basis. Our annualized non-GAAP operating ROE of 12.3% in Nine Months 2019 was 30 basis points above our 2019 target of 12% and 100 basis points higher than the annualized non-GAAP operating ROE in Nine Months 2018.

Despite exceeding our target, our annualized non-GAAP operating ROE was negatively impacted by net unrealized after-tax gains of $175 million on our fixed income securities portfolio, which decreased our annualized non-GAAP operating ROE by 60 basis points. We currently expect interest rates to remain low, which will likely put pressure on our ROE and non-GAAP operating ROE in 2020.

Insurance Operations

Our insurance segments delivered profitable results in Third Quarter and Nine Months 2019, contributing to a combined annualized ROE in the quarter of 4.7% and in the year-to-date period of 5.9%. The Third Quarter 2019 annualized ROE decreased 1.4 points compared to Third Quarter 2018, reflecting an increase in our combined ratio of 0.6 points. The increase was principally driven by higher non-catastrophe property loss and loss expenses and a higher expense ratio. The higher expense ratio of 1.6 points reflected the following: (i) a 0.5-point increase in employee-related expenses, including 0.3 points for employee severance-related expenses noted above; and (ii) a 0.6-point increase in profit-based compensation to our distribution partners and employees.

The annualized ROE in Nine Months 2019 increased 1.3 points compared to Nine Months 2018, because of the improvement in the combined ratio of 1.5 points. The combined ratio improvement was principally driven by: (i) lower levels of non-catastrophe property loss and loss expenses; and (ii) higher levels of favorable prior year casualty reserve development. These improvements were partially offset by the increase in the expense ratio of 0.6 points, which reflected a 0.4-point increase in profit-based compensation to our distribution partners and employees.

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The following table provides quantitative information for analyzing the combined ratio:

All Lines	Quarter ended September 30,				Change % or Points			Nine Months ended September 30,				Change % or Points
($ in thousands)	2019			2018				2019			2018
Insurance Operations Results:
Net premiums written ("NPW")	$	676,928		651,668	4		%	$	2,051,272		1,931,476	6		%
Net premiums earned (“NPE”)	653,620			614,277	6			1,928,812			1,810,941	7
Less:
Loss and loss expense incurred	398,675			379,199	5			1,166,238			1,130,468	3
Net underwriting expenses incurred	222,599			199,791	11			648,693			598,437	8
Dividends to policyholders	1,045			2,290	(54	)		4,394			6,274	(30	)
Underwriting income	$	31,301		32,997	(5	)	%	$	109,487		75,762	45		%
Combined Ratios:
Loss and loss expense ratio	60.9		%	61.7	(0.8	)	pts	60.5		%	62.5	(2.0	)	pts
Underwriting expense ratio	34.1			32.5	1.6			33.6			33.0	0.6
Dividends to policyholders ratio	0.2			0.4	(0.2	)		0.2			0.3	(0.1	)
Combined ratio	95.2			94.6	0.6			94.3			95.8	(1.5	)

Our Third Quarter and Nine Months 2019 results continue to reflect our efforts to: (i) achieve overall renewal pure price increases at levels that are in line with expected loss trend; (ii) generate new business; and (iii) improve the underlying profitability of our business through various underwriting and claims initiatives. We continue to execute on our strategy for disciplined NPW growth, with 4% growth in Third Quarter 2019 and 6% growth in Nine Months 2019 compared to the same prior year periods. This growth was primarily due to renewal pure price increases and new business growth in our Standard Commercial Lines. Our growth was aided by the net appointment of 57 retail agents, excluding agency consolidations.

Loss and Loss Expenses

The decreases in the loss and loss expense ratio during both periods presented above were driven by the following:

	Third Quarter 2019						Third Quarter 2018
($ in millions)	Loss and Loss Expense Incurred			Impact on Loss and Loss Expense Ratio			Loss and Loss Expense Incurred			Impact on Loss and Loss Expense Ratio			Change in Ratio
Catastrophe losses	$	24.2		3.7		pts	$	28.1		4.6		pts	(0.9	)	pts
(Favorable) prior year casualty reserve development	(14.0		)	(2.1	)		(12.0		)	(2.0	)		(0.1	)
Non-catastrophe property loss and loss expenses	108.8			16.7			100.8			16.4			0.3
Total	119.0			18.3			116.9			19.0			(0.7	)
	Nine Months 2019						Nine Months 2018
($ in millions)	Loss and Loss Expense Incurred			Impact on Loss and Loss Expense Ratio			Loss and Loss Expense Incurred			Impact on Loss and Loss Expense Ratio			Change in Ratio
Catastrophe losses	$	74.5		3.9		pts	$	72.9		4.0		pts	(0.1	)	pts
(Favorable) prior year casualty reserve development	(41.0		)	(2.1	)		(24.0		)	(1.3	)		(0.8	)
Non-catastrophe property loss and loss expenses	309.6			16.1			310.9			17.2			(1.1	)
Total	343.1			17.9			359.8			19.9			(2.0	)

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Details of the prior year casualty reserve development were as follows:

(Favorable)/Unfavorable Prior Year Casualty Reserve Development	Quarter ended September 30,						Nine Months ended September 30,
($ in millions)	2019				2018		2019		2018
General liability	$	(3.0	)		(8.0	)	(10.0	)	(8.0	)
Commercial automobile	—				10.0		—		25.0
Workers compensation	(13.0		)		(20.0	)	(33.0	)	(53.0	)
Total Standard Commercial Lines	(16.0		)		(18.0	)	(43.0	)	(36.0	)
Homeowners	—				—		—		—
Personal automobile	2.0				—		2.0		—
Total Standard Personal Lines	2.0				—		2.0		—
E&S	—				6.0		—		12.0
Total (favorable) prior year casualty reserve development	$	(14.0	)		(12.0	)	(41.0	)	(24.0	)
(Favorable) impact on loss ratio	(2.1		)	pts	(2.0	)	(2.1	)	(1.3	)

For additional qualitative discussions regarding reserve development, please refer to the insurance segment sections below in "Results of Operations and Related Information by Segment."

Investments Segment

Net investment income, after tax, grew 6% in Third Quarter 2019 and 16% in Nine Months 2019, compared to the same prior year periods, principally driven by: (i) cash flows from operations that were 22% of NPW in the quarter and 15% of NPW in the year-to-date period; (ii) $106 million in net proceeds from our 5.375% Senior Notes issuance earlier in 2019; and (iii) alternative investment income that, for Nine Months 2019, was $2.4 million higher than the comparable prior year period. Net investment income, after tax, contributed 8.6 points to ROE in Third Quarter 2019 and 9.1 points in Nine Months 2019, compared to 10.0 points in Third Quarter 2018 and 9.0 points in Nine Months 2018.

Net realized and unrealized gains and losses reduced ROE by 0.5 points in Third Quarter 2019, compared to a reduction of 0.9 points in Third Quarter 2018. Net realized and unrealized gains and losses increased ROE by 0.8 points in Nine Months 2019, compared to a reduction of 1.0 point in Nine Months 2018. The improvement in both periods was primarily driven by a reduction in realized losses on our fixed income securities portfolio, which was driven by less opportunistic sales. During Third Quarter 2019, we sold a significant portion of our public equity securities and generated $21.6 million of realized gains on the sale, which was principally offset by a $21.4 million reversal of previously-recorded unrealized gains on these securities.

Other

Our interest and corporate expenses, which are primarily comprised of stock compensation expense at the holding company

level, reduced ROE by 2.1 points and 2.9 points in Third Quarter and Nine Months 2019, respectively, compared to 2.3 points in both Third Quarter and Nine Months 2018. The quarter-to-date variance was driven primarily by a 0.6-point decrease in stock compensation expense related to our liability-based awards, as the stock price increase in Third Quarter 2019 was less than the increase in Third Quarter 2018, partially offset by a 0.3-point increase in stock compensation expense associated with employee severance-related expenses.

In addition, on March 1, 2019, Selective issued 5.375% Senior Notes with an aggregate principal amount of $300 million, the proceeds of which were used, in part, to redeem our 5.875% Senior Notes with an aggregate principal balance of $185 million that became callable last year. As a result of this redemption, we incurred after-tax debt retirement costs of $3.3 million, which reduced our ROE by 0.2 points in Nine Months 2019. These costs have been excluded from non-GAAP operating income.

Outlook

We ended 2018 with record levels of capital and liquidity and our strong Nine Months 2019 results have continued to improve our financial position. In the first quarter of 2019, we executed our first institutional public debt offering with the issuance of $300 million aggregate principal amount of 5.375% Senior Notes.

For 2019, we have established a non-GAAP operating ROE target of 12%, which is an appropriate return for our shareholders based on our current estimated weighted average cost of capital, the current interest rate environment, and property and casualty insurance market conditions, and have exceeded our target with 12.3% annualized non-GAAP operating ROE through Nine Months 2019.

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As we head into the closing months of 2019, our focus will be on the following areas:

• Achieving written renewal pure price increases that are in line with expected loss trend. We achieved renewal pure price increases on our overall insurance operations of 3.6% in Nine Months 2019.

• Delivering on our strategy for continued disciplined growth, which will be driven by the addition of new agents,

greater "share of wallet" in our existing agents’ offices, and geographic expansion. Our longer-term Standard Commercial Lines target is to attain a 3% market share in the states in which we operate, by appointing distribution partner relationships approximating 25% of their markets and seeking an average "share of wallet" of 12% across the relationships. This goal represents an additional premium opportunity in excess of $2.7 billion in our 27 state footprint. In Nine Months 2019, we achieved NPW growth of 6%. Our current agency market share stands at over 20%, and our average "share of wallet" is approximately 8% in our legacy states.

• Continuing to enhance the customer experience strategy that we have been highlighting over the past few years, including value-added technologies and services such as: (i) our “Selective^® Drive” program, which was first introduced to certain commercial automobile policyholders through our distribution partners in the fourth quarter of 2018; (ii) proactive communications in relation to product recalls, possible loss activity, policy changes, and risk management activities; (iii) Security Mentor, a product provided to our customers to better understand and manage cybersecurity risks; (iv) technology usage to reduce claim cycle time, such as SWIFTClaim^® fast tracking; and (v) digital self-service capabilities for our customers.

• Improving profitability in our lines of business by: (i) generating overall renewal pure price increases that are in line with expected loss trend; (ii) actively managing new and renewal books of business in targeted industry segments, which we expect will have a positive impact on profitability through business mix; (iii) deploying sophisticated claims tools, including enhanced modeling and segmentation strategies, which we expect will improve loss experience; and (iv) within our E&S segment, exiting some underperforming classes, while entering into new distribution relationships.

• Actively managing the investment portfolio to enhance after-tax yields while managing credit, duration, and liquidity

risk. There was a significant decline in interest rates in Nine Months 2019, which demonstrates the need to maintain a strong focus on underwriting discipline to generate adequate returns on invested capital.

Our agile approach to driving underwriting, pricing and claims improvements is best demonstrated by our combined ratio that has averaged 94.0% since 2014, well ahead of the U.S. property and casualty industry average combined ratio that averaged 99.6% during the same period. Our strong technical and underwriting capabilities, underwriting leverage of 1.4x, and proven track record of effectively managing renewal pricing and retention, position us well for continued success in this low interest rate environment. As we look to the remainder of 2019, we remain pleased with our financial and strategic position. Our steadfast focus on underwriting discipline, combined with the investments we are making today in our franchise distribution model, sophisticated underwriting tools and technology, and overall customer experience in an omni-channel environment, will position us for continued long-term success.

For 2019, Conning, Inc.'s ("Conning") third quarter 2019 "Property-Casualty Forecast & Analysis" forecasts a property and casualty insurance industry statutory combined ratio of 96.7%, with a return on equity of 8.5%. This suggests an operating return on equity of approximately 7.5%, after excluding Conning's forecasted after-tax realized gains. We feel positive about the overall environment, and believe our major initiatives highlighted above set the stage for continued financial outperformance.

After three quarters of results, our full-year expectations are as follows:

• A GAAP combined ratio, excluding catastrophe losses, of 91.0%. This assumes no fourth quarter prior-year casualty reserve development;

• Catastrophe losses of 3.5 points;

• After-tax net investment income of $180 million, which includes $14 million after-tax net investment income from our alternative investments;

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• An overall effective tax rate of approximately 19%, which includes an effective tax rate of 18.5% for net investment income, reflecting a tax rate of 5.25% for tax-advantaged municipal bonds and a tax rate of 21% for all other items; and

• Weighted average shares of 60 million on a diluted basis.

Results of Operations and Related Information by Segment

Standard Commercial Lines Segment

	Quarter ended September 30,				Change % or Points			Nine Months ended September 30,				Change % or Points
($ in thousands)	2019			2018				2019			2018
Insurance Segments Results:
NPW	$	532,921		502,312	6		%	$	1,636,983		1,526,318	7		%
NPE	515,161			481,056	7			1,518,994			1,422,432	7
Less:
Loss and loss expense incurred	304,038			291,110	4			895,999			858,550	4
Net underwriting expenses incurred	180,062			161,323	12			525,627			483,455	9
Dividends to policyholders	1,045			2,290	(54	)		4,394			6,274	(30	)
Underwriting income	$	30,016		26,333	14		%	$	92,974		74,153	25		%
Combined Ratios:
Loss and loss expense ratio	59.0		%	60.5	(1.5	)	pts	59.0		%	60.4	(1.4	)	pts
Underwriting expense ratio	35.0			33.5	1.5			34.6			34.0	0.6
Dividends to policyholders ratio	0.2			0.5	(0.3	)		0.3			0.4	(0.1	)
Combined ratio	94.2			94.5	(0.3	)		93.9			94.8	(0.9	)

The increases in NPW in the quarter and year-to-date periods reflected in the table above were driven by: (i) direct new business; and (ii) renewal pure price increases.

	Quarter ended September 30,				Change % or Points			Nine Months ended September 30,			Change % or Points
($ in millions)	2019			2018				2019		2018
Direct new business	$	96.5		90.4	7		%	316.2		289.5	9		%
Renewal pure price increases	3.5			3.7	(0.2	)		3.3		3.5	(0.2	)
Retention	84		%	84	—		pts	83	%	83	—		pts

The loss and loss expense ratio decreased 1.5 points in Third Quarter 2019 compared to Third Quarter 2018, and decreased 1.4 points in Nine Months 2019 compared to Nine Months 2018, and were driven by the following:

	Third Quarter 2019						Third Quarter 2018
($ in millions)	Loss and Loss Expense Incurred			Impact on Loss and Loss Expense Ratio			Loss and Loss Expense Incurred			Impact on Loss and Loss Expense Ratio			Change in Ratio
Catastrophe losses	$	14.8		2.9		pts	$	22.1		4.6		pts	(1.7	)	pts
Non-catastrophe property loss and loss expenses	76.7			14.9			67.1			13.9			1.0
(Favorable) prior year casualty reserve development	(16.0		)	(3.1	)		(18.0		)	(3.7	)		0.6
Total	75.5			14.7			71.2			14.8			(0.1	)
	Nine Months 2019						Nine Months 2018
($ in millions)	Loss and Loss Expense Incurred			Impact on Loss and Loss Expense Ratio			Loss and Loss Expense Incurred			Impact on Loss and Loss Expense Ratio			Change in Ratio
Catastrophe losses	$	52.1		3.4		pts	$	52.0		3.7		pts	(0.3	)	pts
Non-catastrophe property loss and loss expenses	213.8			14.1			208.3			14.6			(0.5	)
(Favorable) prior year casualty reserve development	(43.0		)	(2.8	)		(36.0		)	(2.5	)		(0.3	)
Total	222.9			14.7			224.3			15.8			(1.1	)

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In addition to the items described above, during the quarter there was a 1.1-point improvement in current year loss costs. This improvement reflects the impact of elevated frequencies we experienced during Third Quarter 2018 related to the then current accident year.

For additional information regarding favorable prior year casualty reserve development by line of business, see the "Financial Highlights of Results for Third Quarter and Nine Months 2019 and Third Quarter and Nine Months 2018" section above and the line of business discussions below.

There was a 1.5-point increase in the underwriting expense ratio in Third Quarter 2019 compared to Third Quarter 2018, and a 0.6-point increase in the underwriting expense ratio in Nine Months 2019 compared to Nine Months 2018. The primary driver was increased profit-based expenses to our distribution partners and employees of 0.6 points in the quarter and 0.4 points in the year-to-date period.

The following is a discussion of our most significant Standard Commercial Lines of business:

General Liability
	Quarter ended September 30,				Change % or Points			Nine Months ended September 30,					Change % or Points
($ in thousands)	2019			2018				2019			2018
NPW	$	172,471		160,105	8		%	$	536,448		494,984		8		%
Direct new business	27,788			26,768	4			92,288			86,210		7
Retention	85		%	85	—		pts	83		%	84		(1	)	pts
Renewal pure price increases	3.3			2.9	0.4			2.7			2.7		—
NPE	$	169,084		154,974	9		%	$	495,402		457,805		8		%
Underwriting income	22,399			24,374	(8	)		62,232			54,074		15
Combined ratio	86.8		%	84.3	2.5		pts	87.4		%	88.2	%	(0.8	)	pts
% of total Standard Commercial Lines NPW	32			32				33			32

The fluctuations in the combined ratios illustrated in the table above included the following:

	Third Quarter 2019						Third Quarter 2018
($ in millions)	Loss and Loss Expense Incurred			Impact on Combined Ratio			Loss and Loss Expense Incurred			Impact on Combined Ratio			Change Points
(Favorable) prior year casualty reserve development	$	(3.0	)	(1.8	)	pts	$	(8.0	)	(5.2	)	pts	3.4		pts
	Nine Months 2019						Nine Months 2018
($ in millions)	Loss and Loss Expense Incurred			Impact on Combined Ratio			Loss and Loss Expense Incurred			Impact on Combined Ratio			Change Points
(Favorable) prior year casualty reserve development	$	(10.0	)	(2.0	)	pts	$	(8.0	)	(1.7	)	pts	(0.3	)	pts

The Third Quarter and Nine Months 2019 reserve development was primarily attributable to favorable reserve development on loss severities in accident years 2015 through 2017. The Third Quarter and Nine Months 2018 reserve development was primarily attributable to favorable reserve development on loss adjustment expenses in accident years 2014 through 2017.

Commercial Automobile
	Quarter ended September 30,						Change % or Points			Nine Months ended September 30,						Change % or Points
($ in thousands)	2019				2018					2019				2018
NPW	$	150,765			135,579		11		%	$	453,201			399,506		13		%
Direct new business	24,096				23,363		3			80,840				70,668		14
Retention	85			%	82		3		pts	82			%	83		(1	)	pts
Renewal pure price increases	7.5				7.5		—			7.4				7.4		—
NPE	$	141,182			124,862		13		%	$	408,706			365,197		12		%
Underwriting loss	(11,398		)		(22,785	)	50			(28,919		)		(46,922	)	38
Combined ratio	108.1			%	118.2		(10.1	)	pts	107.1			%	112.8		(5.7	)	pts
% of total Standard Commercial Lines NPW	28				27					28				26

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The increases in NPW shown in the table above reflect renewal pure price increases on this line, coupled with an increase in new business as we continue to write commercial automobile policies as part of our overall customer accounts. The growth in NPW of 13% in Nine Months 2019 compared to Nine Months 2018 reflects an 8% growth in vehicle counts and a 7.4% renewal pure price increase, reflecting our efforts to improve profitability on this line by actively implementing price increases in recent years.

The combined ratio improvements outlined above were driven by the following:

	Third Quarter 2019				Third Quarter 2018
($ in millions)	Loss and Loss Expense Incurred		Impact on Combined Ratio		Loss and Loss Expense Incurred		Impact on Combined Ratio		Change in Ratio
Non-catastrophe property loss and loss expenses	$	26.5	18.8	pts	$	21.9	17.6	pts	1.2		pts
Unfavorable prior year casualty reserve development	—		—		10.0		8.0		(8.0	)
Catastrophe losses	1.2		0.9		0.4		0.3		0.6
Total	27.7		19.7		32.3		25.9		(6.2	)

	Nine Months 2019				Nine Months 2018
($ in millions)	Loss and Loss Expense Incurred		Impact on Combined Ratio		Loss and Loss Expense Incurred		Impact on Combined Ratio		Change in Ratio
Non-catastrophe property loss and loss expenses	$	75.5	18.5	pts	$	65.6	18.0	pts	0.5		pts
Unfavorable prior year casualty reserve development	—		—		25.0		6.8		(6.8	)
Catastrophe losses	2.3		0.6		1.9		0.5		0.1
Total	77.8		19.1		92.5		25.3		(6.2	)

Our commercial automobile line of business has not experienced prior year casualty reserve development in 2019. The unfavorable development in Third Quarter 2018 and Nine Months 2018 was primarily due to higher claim frequencies, and to some extent severities, in accident years 2015 through 2017.

This line of business remains an area of focus for both us and the industry, as profitability challenges continue to generate combined ratios that are higher than target levels. To address profitability in this line, we have been actively implementing price increases, which averaged 7.4% for Nine Months 2019. In addition to price increases, we have also been actively managing our new and renewal business, which we expect will have a positive impact on profitability through business mix improvement. Over the longer term, we expect accounts that adopt our recently introduced Selective^® Drive program will have greater insight to their commercial auto risks and have the potential to reduce their loss experience.

Workers Compensation
	Quarter ended September 30,					Change % or Points			Nine Months ended September 30,					Change % or Points
($ in thousands)	2019				2018				2019				2018
NPW	$	71,534			77,827	(8	)	%	$	238,037			248,728	(4	)	%
Direct new business	12,025				12,582	(4	)		46,765				46,000	2
Retention	84			%	84	—		pts	83			%	84	(1	)	pts
Renewal pure price (decreases) increases	(2.7		)		—	(2.7	)		(2.8		)		0.1	(2.9	)
NPE	$	75,478			78,784	(4	)	%	$	232,657			237,628	(2	)	%
Underwriting income	17,333				23,380	(26	)		42,566				61,601	(31	)
Combined ratio	77.0			%	70.3	6.7		pts	81.7			%	74.1	7.6		pts
% of total Standard Commercial Lines NPW	13				16				15				16

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The increases in the combined ratio in Third Quarter and Nine Months 2019 compared to the same prior year periods were driven by less favorable prior year casualty reserve development, as follows:

	Third Quarter 2019						Third Quarter 2018
($ in millions)	Loss and Loss Expense Incurred			Impact on Combined Ratio			Loss and Loss Expense Incurred			Impact on Combined Ratio			Change Points
(Favorable) prior year casualty reserve development	$	(13.0	)	(17.2	)	pts	$	(20.0	)	(25.4	)	pts	8.2	pts
	Nine Months 2019						Nine Months 2018
($ in millions)	Loss and Loss Expense Incurred			Impact on Combined Ratio			Loss and Loss Expense Incurred			Impact on Combined Ratio			Change Points
(Favorable) prior year casualty reserve development	$	(33.0	)	(14.2	)	pts	$	(53.0	)	(22.3	)	pts	8.1	pts

The development in both Third Quarter and Nine Months 2019 was primarily due to lower severities in accident years 2017 and prior, and the development in both Third Quarter and Nine Months 2018 was primarily due to lower severities in accident years 2016 and prior.

While reported profitability on this line remains strong due to favorable emergence on prior year reserves, current accident year margins do not support the continued negative pricing levels that are being set by the National Council on Compensation Insurance and independent state rating bureaus. A reduction or reversal in the trend of favorable frequencies and severities has the potential to significantly increase this line's combined ratio, which we are monitoring closely.

Commercial Property
	Quarter ended September 30,						Change % or Points			Nine Months ended September 30,					Change % or Points
($ in thousands)	2019				2018					2019			2018
NPW	$	97,393			89,737		9		%	$	284,861		263,318		8		%
Direct new business	22,527				18,073		25			64,960			57,485		13
Retention	83			%	83		—		pts	82		%	82		—		pts
Renewal pure price increases	2.8				3.3		(0.5	)		3.3			3.1		0.2
NPE	$	89,215			83,056		7		%	$	262,418		245,544		7		%
Underwriting (loss) income	(409		)		(6,768	)	(94	)		2,866			(9,266	)	131
Combined ratio	100.5			%	108.1		(7.6	)	pts	98.9		%	103.8		(4.9	)	pts
% of total Standard Commercial Lines NPW	18				18					17			17

The decrease in the combined ratio in Third Quarter 2019 compared to Third Quarter 2018, and the decrease in the combined ratio in Nine Months 2019 compared to Nine Months 2018, were driven by the following:

	Third Quarter 2019				Third Quarter 2018
($ in millions)	Loss and Loss Expense Incurred		Impact on Combined Ratio		Loss and Loss Expense Incurred		Impact on Combined Ratio		Change % or Points
Catastrophe losses	$	12.4	13.9	pts	$	20.1	24.2	pts	(10.3	)	pts
Non-catastrophe property loss and loss expenses	41.5		46.5		38.1		45.9		0.6
Total	53.9		60.4		58.2		70.1		(9.7	)
	Nine Months 2019				Nine Months 2018
($ in millions)	Loss and Loss Expense Incurred		Impact on Combined Ratio		Loss and Loss Expense Incurred		Impact on Combined Ratio		Change % or Points
Catastrophe losses	$	43.6	16.6	pts	$	42.6	17.4	pts	(0.8	)	pts
Non-catastrophe property loss and loss expenses	114.6		43.7		118.7		48.3		(4.6	)
Total	158.2		60.3		161.3		65.7		(5.4	)

Lower catastrophe losses in Third Quarter 2019 compared to Third Quarter 2018 was driven by the impact of Hurricane Florence in September 2018. On a year-to-date basis, non-catastrophe property loss and loss expenses were lower in Nine Month 2019 compared to Nine Months 2018, as non-catastrophe property loss and loss expenses in the first quarter of 2018 were elevated by a January deep freeze in our footprint states and an increase in the number of severe fire losses.

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Standard Personal Lines Segment

	Quarter ended September 30,					Change % or Points			Nine Months ended September 30,				Change % or Points
($ in thousands)	2019				2018				2019			2018
Insurance Segments Results:
NPW	$	81,639			84,735	(4	)	%	$	233,717		236,530	(1	)	%
NPE	76,738				77,157	(1	)		231,158			227,090	2
Less:
Loss and loss expense incurred	54,843				52,631	4			158,467			157,330	1
Net underwriting expenses incurred	22,526				21,368	5			65,617			63,303	4
Underwriting (loss) income	$	(631	)		3,158	(120	)	%	$	7,074		6,457	10		%
Combined Ratios:
Loss and loss expense ratio	71.4			%	68.2	3.2		pts	68.5		%	69.3	(0.8	)	pts
Underwriting expense ratio	29.4				27.7	1.7			28.4			27.9	0.5
Combined ratio	100.8				95.9	4.9			96.9			97.2	(0.3	)

NPW was down in both Third Quarter and Nine Months 2019 compared to the same prior year periods, reflecting the impact of a decrease in direct new business as a result of a competitive marketplace. Retention has decreased in both Third Quarter and Nine Months 2019 compared to the same periods last year, as we continue to achieve renewal pure price increases on our personal automobile line of business in excess of loss trends, while the industry has seen a softening in rate activity.  Additionally, the deteriorating competitive position on our automobile business has led to lower new homeowners business, as we typically write policies at the account level, which include both automobile and homeowners coverage.

	Quarter ended September 30,				Change % or Points			Nine Months ended September 30,				Change % or Points
($ in millions)	2019			2018				2019			2018
Direct new business	$	10.2		13.1	(22	)	%	$	31.1		40.8	(24	)	%
Retention	83		%	85	(2	)	pts	83		%	85	(2	)	pts
Renewal pure price increases	5.0			3.8	1.2			5.3			3.6	1.7

The loss and loss expense ratio increased 3.2 points in Third Quarter 2019 compared to Third Quarter 2018, and decreased 0.8 points in Nine Months 2019 compared to Nine Months 2018. The drivers of these fluctuations are as follows:

	Third Quarter 2019						Third Quarter 2018
($ in millions)	Loss and Loss Expense Incurred			Impact on Loss and Loss Expense Ratio			Loss and Loss Expense Incurred			Impact on Loss and Loss Expense Ratio			Change in Ratio
Non-catastrophe property loss and loss expenses	$	25.2		32.8		pts	$	28.2		36.5		pts	(3.7	)	pts
Catastrophe losses	7.9			10.3			5.4			7.1			3.2
Unfavorable prior year development	2.0			2.6			—			—			2.6
Flood claims handling fees	(1.1		)	(1.4	)		(2.1		)	(2.7	)		1.3
Total	34.0			44.3			31.5			40.9			3.4
	Nine Months 2019						Nine Months 2018
($ in millions)	Loss and Loss Expense Incurred			Impact on Loss and Loss Expense Ratio			Loss and Loss Expense Incurred			Impact on Loss and Loss Expense Ratio			Change in Ratio
Non-catastrophe property loss and loss expenses	$	78.7		34.1		pts	$	80.4		35.4		pts	(1.3	)	pts
Catastrophe losses	18.1			7.8			18.1			8.0			(0.2	)
Unfavorable prior year casualty reserve development	2.0			0.9			—			—			0.9
Flood claims handling fees	(2.7		)	(1.2	)		(3.6		)	(1.6	)		0.4
Total	96.1			41.6			94.9			41.8			(0.2	)

The underwriting expense ratio increased 1.7 points in the Third Quarter 2019 compared to Third Quarter 2018, and 0.5 points in Nine Months 2019 compared to Nine Months 2018. The primary drivers of these changes were increased profit-based expenses to our distribution partners and employees.

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E&S Lines Segment

	Quarter ended September 30,				Change % or Points			Nine Months ended September 30,					Change % or Points
($ in thousands)	2019			2018				2019			2018
Insurance Segments Results:
NPW	$	62,368		64,621	(3	)	%	$	180,572		168,628		7		%
NPE	61,721			56,064	10			178,660			161,419		11
Less:
Loss and loss expense incurred	39,794			35,458	12			111,772			114,588		(2	)
Net underwriting expenses incurred	20,011			17,100	17			57,449			51,679		11
Underwriting income (loss)	$	1,916		3,506	(45	)	%	$	9,439		(4,848	)	295		%
Combined Ratios:
Loss and loss expense ratio	64.5		%	63.2	1.3		pts	62.5		%	71.0		(8.5	)	pts
Underwriting expense ratio	32.4			30.5	1.9			32.2			32.0		0.2
Combined ratio	96.9			93.7	3.2			94.7			103.0		(8.3	)

NPW decreased 3% in Third Quarter 2019 and increased 7% in Nine Months 2019 compared to the respective prior year periods. Over the past two-year period, we have taken steps to exit certain underperforming classes of E&S business, while entering into new distribution relationships. The premium growth on a year-to-date basis continues to reflect the impact of one particularly large relationship that we reestablished in the second quarter of 2018. We do not anticipate the same level of year-over-year growth going forward from this relationship, as it has now been in place for a full year, which is in part the reason for the decline during the quarter compared to the same period last year.

Quantitative information on the premium in this segment is as follows:

	Quarter ended September 30,				Change % or Points			Nine Months ended September 30,				Change % or Points
($ in millions)	2019			2018				2019			2018
Direct new business	$	23.1		32.2	(28	)	%	$	73.8		70.8	4		%
Renewal pure price increases1	3.7		%	4.9	(1.2	)	pts	4.4		%	5.3	(0.9	)	pts

¹E&S casualty renewal price increases were 3.0% for Third Quarter 2019, compared to 5.2% for Third Quarter 2018, and 4.0% for Nine Months 2019, compared to 6.2% for Nine Months 2018.

The combined ratio increased 3.2 points in Third Quarter 2019 compared to Third Quarter 2018, and improved 8.3 points in Nine Months 2019 compared to Nine Months 2018, primarily due to the items outlined in the tables and commentary below:

	Third Quarter 2019				Third Quarter 2018
($ in millions)	Loss and Loss Expense Incurred		Impact on Loss and Loss Expense Ratio		Loss and Loss Expense Incurred		Impact on Loss and Loss Expense Ratio		Change in Ratio
Unfavorable prior year casualty reserve development	—		—	pts	6.0		10.7	pts	(10.7	)	pts
Non-catastrophe property loss and loss expenses	7.0		11.4		5.6		10.0		1.4
Catastrophe losses	1.5		2.4		0.6		1.0		1.4
Total	8.5		13.8		12.2		21.7		(7.9	)
	Nine Months 2019				Nine Months 2018
($ in millions)	Loss and Loss Expense Incurred		Impact on Loss and Loss Expense Ratio		Loss and Loss Expense Incurred		Impact on Loss and Loss Expense Ratio		Change in Ratio
Unfavorable prior year casualty reserve development	$	—	—	pts	$	12.0	7.4	pts	(7.4	)	pts
Non-catastrophe property loss and loss expenses	17.1		9.6		22.2		13.7		(4.1	)
Catastrophe losses	4.3		2.4		2.7		1.7		0.7
Total	21.4		12.0		36.9		22.8		(10.8	)

The improvement in prior year casualty reserve development of 10.7 points in Third Quarter 2019 compared to Third Quarter 2018 was partially offset by current year loss costs that were 8.6 points higher in Third Quarter 2019 compared to Third Quarter 2018. These variances were driven by adjustments made during 2018 as a result of the normal reserve review process, which indicated unfavorable development in older years, while showing improvements in the then current year-to-date period,

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largely due to our pricing and underwriting actions.

The underwriting expense ratio increased 1.9 points in Third Quarter 2019 compared to Third Quarter 2018, primarily driven by an increase in profit-based compensation to our distribution partners.

While the relatively small size of this segment can lead to some volatility in results from quarter to quarter, on a longer-term basis, improved underwriting, pricing, and claims outcomes have us on track to achieve our risk-adjusted profitability target for this segment by the end of 2020.

Reinsurance

We have successfully completed the renewals of our July 1, 2019 excess of loss treaties, which provide coverage for our Standard Commercial Lines, Standard Personal Lines, and E&S Lines. These treaties were renewed with principally the same structure as the expiring treaties, with an underwriting year ceded premium increase estimated at $10 million, or 14%, which reflects an increase in our estimated subject matter premium and a risk-adjusted price increase for our property treaty,driven by heavy loss activity from the 2018 underwriting year and the pricing environment in the property per-risk reinsurance marketplace.

Details of the treaties are as follows:

Property Excess of Loss

Our property excess of loss treaty ("Property Treaty") provides protection against large individual property losses with $58.0 million of coverage in excess of a $2.0 million retention:

• The per occurrence cap on the first and second layers is $84.0 million.

• The first layer has unlimited reinstatements and a limit of $8.0 million in excess of $2.0 million.

• The annual aggregate limit, for the $30.0 million in excess of $10.0 million second layer, is $120.0 million.

• A third layer has a limit of $20.0 million in excess of $40.0 million, with an annual aggregate limit of approximately $75.0 million.

• The Property Treaty excludes nuclear, biological, chemical, and radiological ("NBCR") terrorism losses, and includes non-NBCR losses from terrorism.

Casualty Excess of Loss

Our casualty excess of loss treaty (“Casualty Treaty”) provides protection against large individual casualty losses with $88.0 million of coverage in excess of a $2.0 million retention:

• The first through sixth layers provide coverage for 100% of up to $88.0 million in excess of a $2.0 million retention.

• The Casualty Treaty includes a $25.0 million limit, per life, on our workers compensation business, which remains unchanged from the prior treaty.

• The Casualty Treaty excludes NBCR terrorism losses and has annual aggregate non-NBCR terrorism limits of $208.0 million.

Investments

The primary objective of the investment portfolio is to maximize after-tax net investment income and the overall total return of the portfolio, while maintaining a high credit quality core fixed income securities portfolio and managing our duration risk profile. The effective duration of the fixed income securities portfolio as of September 30, 2019 was 3.4 years, compared to the Insurance Subsidiaries’ liability duration as of December 31, 2018 of approximately 3.6 years. The effective duration of the fixed income securities portfolio is monitored and managed to maximize yield, while managing interest rate risk at an acceptable level. We maintain a well-diversified portfolio across sectors, credit quality, and maturities that affords us ample liquidity. Purchases and sales are made with the intent of maximizing investment returns in the current market environment while balancing capital preservation. Over time, we may seek to increase or decrease the duration and overall credit quality of the portfolio based on market conditions.

Our investment philosophy includes certain return and risk objectives for the fixed income, equity, and other investment portfolios. After-tax yield and net investment income generation are key drivers to our investment strategy, which we believe will be obtained through active management of the portfolio.

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Total Invested Assets
($ in thousands)	September 30, 2019		December 31, 2018	Change
Total invested assets	$	6,551,739	5,960,651	10		%
Invested assets per dollar of stockholders' equity	3.07		3.33	(8	)
Unrealized gain – before tax1	225,100		11,916	1,789
Unrealized gain – after tax1	177,829		9,414	1,789

¹Includes unrealized gains on fixed income and equity securities.

The increase in invested assets at September 30, 2019, compared to December 31, 2018, was driven by: (i) operating cash flow generated in Nine Months 2019 of $316 million; (ii) pre-tax net unrealized gains in our fixed income and equity securities portfolios of $213 million, due to a reduction in interest rates and tightening corporate credit spreads; and (iii) net proceeds of $106 million from the issuance of our 5.375% Senior Notes. For additional information regarding these debt transactions, see Note 5. "Indebtedness" in Item 1. "Financial Statements" of this Form 10-Q.

At September 30, 2019, our fixed income securities and short-term investment portfolios represented 96% of our invested assets, compared to 95% at December 31, 2018. These portfolios had a weighted average credit rating of “ AA- ,” as of both September 30, 2019 and December 31, 2018, with 97% and 98% of the securities in the portfolio being investment grade quality, respectively. The sector composition and credit quality of our major asset categories within our fixed income securities portfolio did not significantly change from December 31, 2018.

For details regarding the credit quality of our portfolio, see Item 7A. “Quantitative and Qualitative Disclosures About Market Risk.” of our 2018 Annual Report.

Net Investment Income

The components of net investment income earned for the indicated periods were as follows:

	Quarter ended September 30,					Change % or Points			Nine Months ended September 30,				Change % or Points
($ in thousands)	2019			2018					2019		2018
Fixed income securities	$	50,749		45,088		13	%		150,689		130,903		15	%
Equity securities	1,885			2,079		(9	)		5,265		5,876		(10	)
Short-term investments	1,410			867		63			5,213		2,001		161
Other investments	5,267			7,211		(27	)		13,421		10,868		23
Investment expenses	(3,485		)	(2,802	)	(24	)		(9,639	)	(8,421	)	(14	)
Net investment income earned – before tax	55,826			52,443		6			164,949		141,227		17
Net investment income tax expense	(10,452		)	(9,568	)	(9	)		(30,630	)	(24,973	)	(23	)
Net investment income earned – after tax	$	45,374		42,875		6			134,319		116,254		16
Effective tax rate	18.7		%	18.2		0.5		pts	18.6		17.7		0.9		pts
Annualized after-tax yield on fixed income securities	2.8			2.8		—			2.9		2.8		0.1
Annualized after-tax yield on investment portfolio	2.8			3.0		(0.2	)		2.9		2.7		0.2

The increase in pre-tax net investment income in Third Quarter and Nine Months 2019, compared to the same periods last year, was primarily driven by: (i) cash flow from operations that was 22% of NPW in the quarter and 15% of NPW in the year-to-date period; and (ii) $106 million of net proceeds from our 5.375% Senior Notes issuance earlier in 2019, which were invested in fixed income securities. Additionally, Nine Months 2019 included alternative investment returns that were $2.4 million higher than the comparable prior year period.

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Realized and Unrealized Gains and Losses

Our general philosophy for sales of securities is to reduce our exposure to securities and sectors based on economic evaluations and when the fundamentals for that security or sector have deteriorated, or to opportunistically trade out of securities to other securities with better economic return characteristics. Net realized and unrealized gains and losses for the indicated periods were as follows:

	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019		2018
Net realized gains (losses) on disposals, excluding OTTI	$	20,425		(751	)	26,752		4,034
Unrealized (losses) recognized in income on equity securities	(20,317		)	(2,610	)	(8,091	)	(15,563	)
OTTI charges	(2,291		)	(1,426	)	(3,366	)	(5,459	)
Total net realized and unrealized (losses) gains	$	(2,183	)	(4,787	)	15,295		(16,988	)

The $2.6 million improvement in net realized and unrealized losses in Third Quarter 2019 compared to Third Quarter 2018 was primarily driven by an $8.3 million reduction in realized losses on our fixed income securities portfolio reflecting less opportunistic sales, partially offset by a decrease of $4.8 million in unrealized gains due to market value increases on our equity securities that were less in Third Quarter 2019 compared to Third Quarter 2018.

The significant drivers of the $32.3 million improvement in net realized and unrealized gains in Nine Months 2019 compared to net realized and unrealized losses in Nine Months 2018 were: (i) a $16.0 million reduction in realized losses on our fixed income securities portfolio driven by less opportunistic sales; and (ii) an increase of $14.2 million in unrealized gains due to more significant market value increases on our equity securities portfolio in Nine Months 2019 compared to Nine Months 2018.

In addition to the activity above, during Third Quarter 2019, we sold a significant portion of our public equity securities, realizing net gains of $21.6 million on the securities sold. These realized gains were substantially offset in the quarter by the reversal of previously-recorded unrealized gains related to the securities sold, which accounted for $21.4 million of the $20.3 million reduction in the table above.

Federal Income Taxes

The following table provides information regarding federal income taxes:

	Quarter ended September 30,				Nine Months ended September 30,
($ in millions)	2019			2018	2019	2018
Federal income tax expense	$	15.0		11.7	45.3	26.4
Effective tax rate	21.1		%	17.4	19.3	16.5

The effective tax rate in the table above differs from the statutory rate of 21% principally due to: (i) the benefit of tax-advantaged interest and dividend income; and (ii) the impact of excess tax benefits on our stock-based compensation awards, partially offset by the disallowance of certain executive compensation. The increase in the effective tax rate in Third Quarter and Nine Months 2019, compared to Third Quarter and Nine Months 2018, reflects a greater pre-tax income contribution from our insurance operations compared to the relative contribution of tax-advantaged income this year compared to last.

Financial Condition, Liquidity, and Capital Resources

Capital resources and liquidity reflect our ability to generate cash flows from business operations, borrow funds at competitive rates, and raise new capital to meet operating and growth needs.

Liquidity

We manage liquidity with a focus on generating sufficient cash flows to meet the short-term and long-term cash requirements of our business operations. Our cash, excluding restricted cash, and short-term investment position of $327 million at September 30, 2019 was comprised of $34 million at the Parent and $293 million at the Insurance Subsidiaries. Short-term investments are generally maintained in "AAA" rated money market funds approved by the National Association of Insurance Commissioners. The Parent maintains a fixed income security investment portfolio containing high-quality, highly-liquid government and corporate fixed income securities. This portfolio amounted to $224 million at September 30, 2019 and $110 million at December 31, 2018. The Parent had a total of $267 million of cash and liquid investments at September 30, 2019, compared to $146 million at December 31, 2018, with the increase driven by our capital market activities discussed below. The level of cash and invested assets may fluctuate based on various factors, including the amount and availability of dividends from our Insurance Subsidiaries, investment income, expenses, and other liquidity needs of the Parent. Our target is to

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maintain the cash and liquidity at the Parent to two times its expected annual needs, which is currently estimated at $160 million.

Sources of Liquidity

Sources of cash for the Parent have historically consisted of dividends from the Insurance Subsidiaries, the investment portfolio discussed above, borrowings under lines of credit and loan agreements with certain Insurance Subsidiaries, and the issuance of stock and debt securities. We continue to monitor these sources, giving consideration to our long-term liquidity and capital preservation strategies.

Insurance Subsidiary Dividends

We currently anticipate that the Insurance Subsidiaries may pay $110 million in total dividends to the Parent in 2019, a $10 million increase from $100 million paid in 2018, of which $83 million was paid during Nine Months 2019. As of December 31, 2018, our allowable ordinary maximum dividend was $210 million for 2019.

Any dividends to the Parent are subject to the approval and/or review of the insurance regulators in the respective Insurance Subsidiaries' domiciliary states and are generally payable only from earned surplus as reported in the statutory annual statements of those subsidiaries as of the preceding December 31. Although past dividends have historically been met with regulatory approval, there is no assurance that future dividends that may be declared will be approved. For additional information regarding dividend restrictions, refer to Note 19. “Statutory Financial Information, Capital Requirements, and Restrictions on Dividends and Transfers of Funds” in Item 8. “Financial Statements and Supplementary Data.” of our 2018 Annual Report.

The Insurance Subsidiaries generate liquidity through insurance float, which is created by collecting premiums and earning investment income before losses are paid. The period of the float can extend over many years. Our investment portfolio consists of maturity dates that continually provide a source of cash flows for claims payments in the ordinary course of business. The effective duration of the fixed income securities portfolio was 3.4 years as of September 30, 2019, while the liabilities of the Insurance Subsidiaries had a duration as of December 31, 2018 of 3.6 years. As protection for the capital resources of the Insurance Subsidiaries, we purchase reinsurance coverage for significantly large claims or catastrophes that may occur during the year.

Line of Credit

The Parent's line of credit with Wells Fargo Bank, National Association, as administrative agent, and Branch Banking and Trust Company (BB&T) (referred to as our "Line of Credit"), was renewed effective December 1, 2015 with a borrowing capacity of $30 million, which can be increased to $50 million with the approval of both lending partners. This Line of Credit expires on December 1, 2020 and has an interest rate that varies and is based on, among other factors, the Parent's debt ratings. There were no balances outstanding under the Line of Credit at September 30, 2019 or at any time during 2019.

For additional information regarding the Line of Credit agreement and corresponding representations, warranties, and covenants, refer to Note 10. "Indebtedness" in Item 8. "Financial Statements." of our 2018 Annual Report. We continue to meet all covenants under our Line of Credit agreement as of September 30, 2019.

Several of our Insurance Subsidiaries are members of certain branches of the Federal Home Loan Bank, which provides those subsidiaries with additional access to liquidity. Membership is as follows:

Branch	Insurance Subsidiary Member
Federal Home Loan Bank of Indianapolis ("FHLBI")	Selective Insurance Company of South Carolina ("SICSC")1 Selective Insurance Company of the Southeast ("SICSE")1
Federal Home Loan Bank of New York ("FHLBNY")	Selective Insurance Company of America ("SICA") Selective Insurance Company of New York ("SICNY")

¹These subsidiaries are jointly referred to as the "Indiana Subsidiaries" as they are domiciled in Indiana.

The Line of Credit permits aggregate borrowings from the FHLBI and the FHLBNY up to 10% of the respective member company’s admitted assets for the previous year end. Additionally, as SICNY is domiciled in New York, this company's borrowings from the FHLBNY are limited to the lower of 5% of admitted assets for the most recently completed fiscal quarter or 10% of admitted assets for the previous year end. We have a remaining capacity of $289.4 million for Federal Home Loan Bank borrowings, with a $12.9 million additional stock purchase requirement to allow the member companies to borrow their full remaining capacity amounts.

All borrowings from both the FHLBI and the FHLBNY are required to be secured by investments pledged as collateral. For

39

additional information regarding collateral outstanding, refer to Note 4. "Investments" in Item 1. "Financial Statements." of this Form 10-Q.

Short-term Borrowings

During Nine Months 2019, SICA borrowed the following from FHLBNY:

• $50 million in the first quarter of 2019, which was repaid on March 28, 2019.

• $15 million in Third Quarter 2019, which was repaid on August 12, 2019.

For further information regarding this borrowing, see Note 5. "Indebtedness" in Item 1. "Financial Statements." of this Form 10-Q.

Intercompany Loan Agreements

The Parent has lending agreements with the Indiana Subsidiaries that have been approved by the Indiana Department of Insurance, which provide additional liquidity to the Parent. Similar to the Line of Credit agreement, these lending agreements limit borrowings by the Parent from the Indiana Subsidiaries to 10% of the admitted assets of the respective Indiana Subsidiary. The outstanding balance on these intercompany loans was $41.3 million as of September 30, 2019, compared to $45.0 million as of December 31, 2018. The remaining capacity under these intercompany loan agreements was $80.0 million as of September 30, 2019, compared to $76.2 million as of December 31, 2018. Despite not being contractually obligated to do so, the Parent currently plans to repay the remaining outstanding balance over time.

Capital Market Activities

In the first quarter of 2019, the Parent issued $300 million of 5.375% Senior Notes at a discount of $5.9 million which, when coupled with debt issuance costs of approximately $3.3 million, resulted in net proceeds from the offering of $290.8 million. The Parent used a portion of the proceeds to fully redeem the then outstanding $185 million aggregate principal amount of its 5.875% Senior Notes, with the remaining $106 million being used for general corporate purposes. For additional information on these transactions, refer to Note 5. "Indebtedness" in Item 1. "Financial Statements." of this Form 10-Q. The Parent had no private or public issuances of stock during Nine Months 2019.

Uses of Liquidity

The liquidity generated from the sources discussed above is used, among other things, to pay dividends to our shareholders. Dividends on shares of the Parent's common stock are declared and paid at the discretion of the Board of Directors based on our operating results, financial condition, capital requirements, contractual restrictions, and other relevant factors.

On October 30, 2019, our Board of Directors declared, for stockholders of record as of November 15, 2019, a $0.23 per share dividend to be paid on December 2, 2019. This is a 15% increase compared to the dividend declared on July 31, 2019.

Our ability to meet our interest and principal repayment obligations on our debt, as well as our ability to continue to pay dividends to our stockholders, is dependent on liquidity at the Parent coupled with the ability of the Insurance Subsidiaries to pay dividends, if necessary, and/or the availability of other sources of liquidity to the Parent. Our next two principal

repayments, each in the amount of $25 million, are due in 2021, and the next principal payment is due in 2026.

Restrictions on the ability of the Insurance Subsidiaries to declare and pay dividends, without alternative liquidity options, could materially affect our ability to service debt and pay dividends on common stock.

Capital Resources

Capital resources provide protection for policyholders, furnish the financial strength to support the business of underwriting insurance risks, and facilitate continued business growth. At September 30, 2019, we had GAAP stockholders' equity of $2.1 billion and statutory surplus of $1.9 billion. With total debt of $550.7 million, our debt-to-capital ratio was 20.5% at September 30, 2019.

Our cash requirements include, but are not limited to, principal and interest payments on various notes payable, dividends to stockholders, payment of claims, payment of commitments under limited partnership agreements and capital expenditures, as well as other operating expenses, which include commissions to our distribution partners, labor costs, premium taxes, general and administrative expenses, and income taxes. For further details regarding our cash requirements, refer to the section below entitled, “Contractual Obligations, Contingent Liabilities, and Commitments.”

We continually monitor our cash requirements and the amount of capital resources that we maintain at the holding company and operating subsidiary levels. As part of our long-term capital strategy, we strive to maintain capital metrics, relative to the macroeconomic environment, that support our targeted financial strength. Based on our analysis and market conditions, we may take a variety of actions, including, but not limited to, contributing capital to the Insurance Subsidiaries in our insurance

40

operations, issuing additional debt and/or equity securities, repurchasing existing debt, repurchasing shares of the Parent’s common stock, and increasing stockholders’ dividends.

Our capital management strategy is intended to protect the interests of the policyholders of the Insurance Subsidiaries and our stockholders, while enhancing our financial strength and underwriting capacity.

Book value per share increased to $35.98 as of September 30, 2019, from $30.40 as of December 31, 2018, driven by $3.16 in net income per share and $2.94 in unrealized gains on our fixed income securities portfolio, partially offset by $0.60 in dividends to our shareholders.

Ratings

We are rated by major rating agencies that issue opinions on our financial strength, operating performance, strategic position, and ability to meet policyholder obligations. We believe that our ability to write insurance business is most influenced by our rating from A.M. Best Company ("A.M. Best"). We have been rated “A” or higher by A.M. Best for the past 89 years. A downgrade from A.M. Best to a rating below “A-” is an event of default under our Line of Credit and could affect our ability to write new business with customers and/or distribution partners, some of whom are required (under various third-party agreements) to maintain insurance with a carrier that maintains a specified A.M. Best minimum rating.

On October 31, 2019, A.M. Best reaffirmed our "A" rating and upgraded our outlook to "positive" from "stable." In taking this action, A.M. Best cited our strong balance sheet strength, favorable business profile, and appropriate enterprise risk management. In addition, the positive outlook reflects A.M. Best's view of our improved profitability over the past five years on an absolute basis and relative to our peers.

Our other ratings have not changed from those reported in our "Ratings" section of Item 7. "Management's Discussion and Analysis of Financial Condition and Results of Operations." in our 2018 Annual Report and continue to be as follows:

NRSRO	Financial Strength Rating	Outlook
Moody's Investor Services ("Moody's")	A2	Stable
Fitch Ratings ("Fitch")	A+	Stable
Standard & Poor's Global Ratings ("S&P")	A	Stable

In the second quarter of 2019, Fitch reaffirmed our "A+" rating with a "stable" outlook. In taking this action, Fitch cited our strong capitalization and financial performance, with stable underwriting results and return metrics that have remained favorable compared to our peers.

In Third Quarter 2019, S&P reaffirmed our "A" rating with a "stable" outlook. In taking this action, S&P cited our strong capital adequacy and strong operating performance, driven by sound underwriting and steady pure renewal price increases.

Our S&P, Moody's, and Fitch financial strength and associated credit ratings affect our ability to access capital markets.  The interest rate on our Line of Credit varies and is based on, among other factors, the Parent's debt ratings. There can be no assurance that our ratings will continue for any given period of time or that they will not be changed.  It is possible that positive or negative ratings actions by one or more of the rating agencies may occur in the future.

Off-Balance Sheet Arrangements

At September 30, 2019 and December 31, 2018, we did not have any material relationships with unconsolidated entities or financial partnerships, such entities often referred to as structured finance or special purpose entities, which would have been established for the purpose of facilitating off-balance sheet arrangements or for other contractually narrow or limited purposes. As such, we are not exposed to any material financing, liquidity, market, or credit risk that could arise if we had engaged in such relationships.

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Contractual Obligations, Contingent Liabilities, and Commitments

Our future cash payments associated with: (i) loss and loss expense reserves; and (ii) contractual obligations pursuant to operating and financing leases for office space and equipment have not materially changed since December 31, 2018. The following table provides future cash payments on our notes payable as of September 30, 2019, giving consideration to the $300 million 5.375% Senior Notes issuance and the redemption of our $185 million 5.875% Senior Notes in the first quarter of 2019, the details of which are contained in Note 5. "Indebtedness" in Item 1. "Financial Statements." in this Form 10-Q:

Contractual Obligations	Payment Due by Period
			Less than 1 year	1-3 years	3-5 years	More than 5 years
($ in millions)	Total
Notes payable	$	560.0	—	50.0	—	510.0
Interest on debt obligations	657.3		29.1	57.3	56.6	514.3
Total	$	1,217.3	29.1	107.3	56.6	1,024.3

As of September 30, 2019, we had contractual obligations that expire at various dates through 2036 that may require us to invest up to $229.9 million in alternative investments. There is no certainty that any such additional investment will be required. Additionally, as of September 30, 2019, we had the following contractual obligations: (i) $6.7 million to further invest in non-publicly traded common stock within our equity portfolio that expire through 2023; and (ii) $31.9 million to further invest in non-publicly traded collateralized loan obligations in our fixed income securities portfolio that expire through 2030. We expect to have the capacity to repay and/or refinance these obligations as they come due.

We have issued no material guarantees on behalf of others and have no trading activities involving non-exchange traded contracts accounted for at fair value. For additional details on transactions with related parties, see Note 16. "Related Party Transactions" in Item 8. "Financial Statements and Supplementary Data." in our 2018 Annual Report.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

There have been no material changes in the information about market risk set forth in our 2018 Annual Report.

ITEM 4. CONTROLS AND PROCEDURES.

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of our disclosure controls and procedures (as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), as of the end of the period covered by this report. In performing this evaluation, management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission in Internal Control – Integrated Framework ("COSO Framework") in 2013. Based on this evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that, as of the end of such period, our disclosure controls and procedures are: (i) effective in recording, processing, summarizing, and reporting information on a timely basis that we are required to disclose in the reports that we file or submit under the Exchange Act; and (ii) effective in ensuring that information that we are required to disclose in the reports that we file or submit under the Exchange Act is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure. No changes in our internal control over financial reporting (as such term is defined in Rule 13a-15(f) of the Exchange Act) occurred during Nine Months 2019 that materially affected, or are reasonably

likely to materially affect, our internal control over financial reporting.

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS.

In the ordinary course of conducting business, we can be named as defendants in various legal actions. Most are claims litigation involving our Insurance Subsidiaries as either: (i) liability insurers defending or providing indemnity for third-party claims brought against our customers; or (ii) insurers defending first-party coverage claims brought against them. We account for such activity through the establishment of unpaid loss and loss expense reserves. In ordinary course claims litigation, we expect that any potential ultimate liability, after consideration of provisions made for potential losses and costs of defense, will not be material to our consolidated financial condition, results of operations, or cash flows.

From time to time, our Insurance Subsidiaries also are named as defendants in other legal actions, some of which assert claims for substantial amounts. Plaintiffs may style these actions as putative class actions and seek judicial certification of a state or national class for allegations such as improper reimbursement of medical providers paid under workers compensation and personal and commercial automobile insurance policies or improper reimbursement for automobile parts. Similarly, our Insurance Subsidiaries can be named in individual actions seeking extra-contractual damages, punitive damages, or penalties,

42

often alleging bad faith in the handling of insurance claims. We believe that we have valid defenses to these allegations and we account for such activity through the establishment of unpaid loss and loss expense reserves. In these other legal actions, we expect that any potential ultimate liability, after consideration of provisions made for estimated losses, will not be material to our consolidated financial condition. Nonetheless, litigation outcomes are inherently unpredictable and, because the amounts sought in certain of these actions are large or indeterminate, it is possible that any adverse outcomes could have a material adverse effect on our consolidated results of operations or cash flows in particular quarterly or annual periods.

As of September 30, 2019, we do not believe we are involved in any legal action that could have a material adverse effect on our consolidated financial condition, results of operations, or cash flows.

ITEM 1A. RISK FACTORS.

Certain risk factors exist that can have a significant impact on our business, liquidity, capital resources, results of operations, financial condition, and debt ratings. These risk factors might affect, alter, or change actions that we might take in executing our long-term capital strategy, including but not limited to, contributing capital to any or all of the Insurance Subsidiaries, issuing additional debt and/or equity securities, repurchasing our equity securities, repurchasing our existing debt, or increasing or decreasing stockholders' dividends. We operate in a continually changing business environment and new risk factors emerge from time to time. Consequently, we can neither predict such new risk factors nor assess the potential future impact, if any, they might have on our business. There have been no material changes from the risk factors disclosed in Item 1A. “Risk Factors.” in our 2018 Annual Report other than as discussed below.

We face risks regarding our flood business because of uncertainties regarding the NFIP.

We are the fifth largest insurance group in the WYO arrangement of the NFIP, which is managed by the Mitigation Division of the Federal Emergency Management Agency ("FEMA") in the U.S. Department of Homeland Security.  Under the arrangement, we receive an expense allowance for policies written and a servicing fee for claims administered, and all losses are 100% reinsured by the Federal Government.  Effective October 1, 2019, the underwriting expense allowance increased to 30.1%, from 30.0%, of direct premium written. The claim servicing fee remains the combination of 0.9% of direct premium written and 1.5% of incurred losses.

As a WYO carrier, we are required to follow certain NFIP procedures in the administration of flood policies and claims.  Some of these requirements may differ from our normal business practices and may present a reputational risk to our brand.  While insurance companies are regulated by the states and the NFIP requires WYO carriers to be licensed in the states in which they operate, the NFIP is a federal program and WYO carriers are fiscal agents of the U.S. Government and must follow the NFIP's directives.  Consequently, we have the risk that directives from the NFIP and a state regulator on the same issue may conflict.

During Third Quarter 2019, the NFIP's authorization was extended until November 21, 2019, as a short-term solution while Congress continues to debate a more comprehensive proposal. There continues to be significant public policy and political debate in Congress about an extension of the NFIP, appropriate compensation for the WYO carriers, and solutions for flood risk throughout the country. Legislation introduced in Congress, if enacted, could greatly reduce the compensation WYO carriers receive under the NFIP. FEMA can act on its own to revise the arrangement, and did so in October 2019 by increasing the WYO’s underwriting expense allowance by 0.1 points, to 30.1%, from 30.0% .

Our flood business could be impacted by:  (i) a lapse in program authorization; (ii) further changes to WYO carrier compensation; (iii) any mandate for primary insurance carriers to provide flood insurance; or (iv) private writers becoming more prevalent in the marketplace.  The uncertainty created by the public policy debate and politics of flood insurance reform makes it difficult for us to predict the future of the NFIP and our continued participation in the program.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS.

The following table provides information regarding our purchases of our common stock in Third Quarter 2019:

Period	Total Number of Shares Purchased1	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Programs	Maximum Number of Shares that May Yet Be Purchased Under the Announced Programs
July 1 – 31, 2019	179	$	77.50	—	—
August 1 - 31, 2019	540	80.59		—	—
September 1 - 30, 2019	16,537	78.52		—	—
Total	17,256	$	78.57	—	—

¹These shares were purchased from employees in connection with the vesting of restricted stock units. These repurchases were made to satisfy tax withholding obligations with respect to those employees.

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ITEM 6. EXHIBITS.

Exhibit No.
* 11	Statement Re: Computation of Per Share Earnings.
* 31.1	Certification of Chief Executive Officer in accordance with Section 302 of the Sarbanes-Oxley Act of 2002.
* 31.2	Certification of Chief Financial Officer in accordance with Section 302 of the Sarbanes-Oxley Act of 2002.
** 32.1	Certification of Chief Executive Officer in accordance with Section 906 of the Sarbanes-Oxley Act of 2002.
** 32.2	Certification of Chief Financial Officer in accordance with Section 906 of the Sarbanes-Oxley Act of 2002.
* 101	The following financial statements from the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2019, formatted in Inline Extensible Business Reporting Language (iXBRL): (i) Consolidated Balance Sheets, (ii) Consolidated Statements of Income, (iii) Consolidated Statements of Comprehensive Income, (iv) Consolidated Statements of Stockholders' Equity, (v) Consolidated Statements of Cash Flows and (vi) Notes to Consolidated Financial Statements.
*104	The cover page from the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2019, formatted in iXBRL.

 * Filed herewith.

** Furnished and not filed herewith.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this Report to be signed on its behalf by the undersigned thereunto duly authorized.

SELECTIVE INSURANCE GROUP, INC.

Registrant 

Date:	October 31, 2019	By: /s/ Gregory E. Murphy
		Gregory E. Murphy
		Chairman of the Board and Chief Executive Officer
		(principal executive officer)
Date:	October 31, 2019	By: /s/ Mark A. Wilcox
		Mark A. Wilcox
		Executive Vice President and Chief Financial Officer
		(principal financial officer)

44

EX-11

Exhibit 11

SELECTIVE INSURANCE GROUP, INC. AND CONSOLIDATED SUBSIDIARIES

COMPUTATION OF EARNINGS PER SHARE

Third Quarter 2019	Income (Numerator)		Shares (Denominator)	Per Share Amount
(in thousands, except per share amounts)
Basic Earnings Per Share ("EPS"):
Net income available to common stockholders	$	56,150	59,494	$	0.94
Effect of dilutive securities:
Stock compensation plans	—		563
Diluted EPS:
Net income available to common stockholders	$	56,150	60,057	$	0.93
Third Quarter 2018	Income (Numerator)		Shares (Denominator)	Per Share Amount
(in thousands, except per share amounts)
Basic EPS:
Net income available to common stockholders	$	55,435	59,011	$	0.94
Effect of dilutive securities:
Stock compensation plans	—		700
Diluted EPS:
Net income available to common stockholders	$	55,435	59,711	$	0.93
Nine Months 2019	Income (Numerator)		Shares (Denominator)	Per Share Amount
(in thousands, except per share amounts)
Basic EPS:
Net income available to common stockholders	$	189,764	59,386	$	3.20
Effect of dilutive securities:
Stock compensation plans	—		574
Diluted EPS:
Net income available to common stockholders	$	189,764	59,960	$	3.16
Nine Months 2018	Income (Numerator)		Shares (Denominator)	Per Share Amount
(in thousands, except per share amounts)
Basic EPS:
Net income available to common stockholders	$	133,179	58,915	$	2.26
Effect of dilutive securities:
Stock compensation plans	—		711
Diluted EPS:
Net income available to common stockholders	$	133,179	59,626	$	2.23

EX-31.1

Exhibit 31.1

Certification pursuant to Rule 13a-14(a), as adopted pursuant to

Section 302 of the Sarbanes-Oxley Act of 2002

I, GREGORY E. MURPHY, Chairman of the Board and Chief Executive Officer of Selective Insurance Group, Inc. (the “Company”), certify, that:

1. I have reviewed this quarterly report on Form 10-Q of the Company;

2. Based on my knowledge, this quarterly report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this quarterly report, fairly present in all material respects the financial condition, results of operations, comprehensive income and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	October 31, 2019	By: /s/ Gregory E. Murphy
		Gregory E. Murphy
		Chairman of the Board and Chief Executive Officer

EX-31.2

Exhibit 31.2

Certification pursuant to Rule 13a-14(a), as adopted pursuant to

Section 302 of the Sarbanes-Oxley Act of 2002

I, MARK A. WILCOX, Executive Vice President and Chief Financial Officer of Selective Insurance Group, Inc. (the “Company”), certify, that:

1. I have reviewed this quarterly report on Form 10-Q of the Company;

2. Based on my knowledge, this quarterly report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this quarterly report, fairly present in all material respects the financial condition, results of operations, comprehensive income and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	October 31, 2019	By: /s/ Mark A. Wilcox
		Mark A. Wilcox
		Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

I, GREGORY E. MURPHY, Chairman of the Board and Chief Executive Officer of Selective Insurance Group, Inc. (the “Company”), hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the quarterly report on Form 10-Q of the Company for the quarterly period ended September 30, 2019 (the “Form 10-Q”), which this certification accompanies, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, and the information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	October 31, 2019	By: /s/ Gregory E. Murphy
		Gregory E. Murphy
		Chairman of the Board and Chief Executive Officer

EX-32.2

Exhibit 32.2

Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

I, MARK A. WILCOX, Executive Vice President and Chief Financial Officer of Selective Insurance Group, Inc. (the “Company”), hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the quarterly report on Form 10-Q of the Company for the quarterly period ended September 30, 2019 (the “Form 10-Q”), which this certification accompanies, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, and the information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	October 31, 2019	By: /s/ Mark A. Wilcox
		Mark A. Wilcox
		Executive Vice President and Chief Financial Officer

XML

Statements of Cash Flows (Cash Flow Supplemental Disclosures) (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
Interest Paid, Excluding Capitalized Interest, Operating Activities		$ 19,261	$ 15,449
Federal income tax		42,000	7,193
Operating cash flows from operating leases	[1]	6,062	0
Operating cash flows from financing leases		12	0
Financing cash flows from finance leases		811	4,891
Assets acquired under finance lease arrangements		824
Assets acquired under finance lease arrangements			4,114
Assets acquired under operating lease arrangements	[1]	13,648	0
Non-cash purchase of property and equipment		108	0
AFS Fixed Income Securities [Member]
Corporate actions related to securities	[2]	29,771	32,757
Equity Securities [Member]
Corporate actions related to securities	[2]	$ 14,250	$ 944

[1] Upon adoption of ASU 2016-02, effective January 1, 2019, we are required to disclose cash paid for amounts included in the measurement of operating lease liabilities, as well as supplemental non-cash information on operating lease liabilities arising from obtaining operating lease assets.

[2] Examples of such corporate actions include exchanges, non-cash acquisitions, and stock splits.

XML

Investments (Fair Value and Gross Pre-Tax Net Unrealized Loss of Securities By Length of Time) (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2019	Dec. 31, 2018
Percent Of Securities of Amortized Cost In An Unrealized Unrecognized Loss Position		1.00%	2.00%
AFS Fixed Income Securities [Member]
AFS Fair Value, Less than 12 Months		$ 416,634	$ 2,142,433
AFS Unrealized Losses, Less than 12 months	[1]	(4,964)	(36,948)
AFS Fair Value, 12 months or longer		214,441	275,174
AFS Unrealized Losses, 12 months or longer	[1]	(2,783)	(8,119)
AFS Fair Value		631,075	2,417,607
AFS Unrealized Losses	[1]	(7,747)	(45,067)
AFS Fixed Income Securities [Member] | U.S. Government and Government Agencies [Member]
AFS Fair Value, Less than 12 Months		5,014	6,693
AFS Unrealized Losses, Less than 12 months	[1]	(11)	(174)
AFS Fair Value, 12 months or longer		498	23,163
AFS Unrealized Losses, 12 months or longer	[1]	(1)	(418)
AFS Fair Value		5,512	29,856
AFS Unrealized Losses	[1]	(12)	(592)
AFS Fixed Income Securities [Member] | Foreign Government [Member]
AFS Fair Value, Less than 12 Months			12,208
AFS Unrealized Losses, Less than 12 months	[1]		(93)
AFS Fair Value, 12 months or longer			1,482
AFS Unrealized Losses, 12 months or longer	[1]		(14)
AFS Fair Value			13,690
AFS Unrealized Losses	[1]		(107)
AFS Fixed Income Securities [Member] | Obligations of States and Political Subdivisions [Member]
AFS Fair Value, Less than 12 Months		437	196,798
AFS Unrealized Losses, Less than 12 months	[1]	(4)	(2,074)
AFS Fair Value, 12 months or longer		0	42,821
AFS Unrealized Losses, 12 months or longer	[1]	0	(557)
AFS Fair Value		437	239,619
AFS Unrealized Losses	[1]	(4)	(2,631)
AFS Fixed Income Securities [Member] | Corporate Securities [Member]
AFS Fair Value, Less than 12 Months		89,919	1,041,952
AFS Unrealized Losses, Less than 12 months	[1]	(1,862)	(23,649)
AFS Fair Value, 12 months or longer		15,867	78,953
AFS Unrealized Losses, 12 months or longer	[1]	(537)	(4,316)
AFS Fair Value		105,786	1,120,905
AFS Unrealized Losses	[1]	(2,399)	(27,965)
AFS Fixed Income Securities [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member]
AFS Fair Value, Less than 12 Months		176,999	516,106
AFS Unrealized Losses, Less than 12 months	[1]	(2,458)	(6,750)
AFS Fair Value, 12 months or longer		180,898	16,800
AFS Unrealized Losses, 12 months or longer	[1]	(2,195)	(193)
AFS Fair Value		357,897	532,906
AFS Unrealized Losses	[1]	(4,653)	(6,943)
AFS Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member]
AFS Fair Value, Less than 12 Months		59,857	229,338
AFS Unrealized Losses, Less than 12 months	[1]	(126)	(2,548)
AFS Fair Value, 12 months or longer		7,665	66,294
AFS Unrealized Losses, 12 months or longer	[1]	(19)	(1,200)
AFS Fair Value		67,522	295,632
AFS Unrealized Losses	[1]	(145)	(3,748)
AFS Fixed Income Securities [Member] | Residential Mortgage Backed Securities [Member]
AFS Fair Value, Less than 12 Months		84,408	139,338
AFS Unrealized Losses, Less than 12 months	[1]	(503)	(1,660)
AFS Fair Value, 12 months or longer		9,513	45,661
AFS Unrealized Losses, 12 months or longer	[1]	(31)	(1,421)
AFS Fair Value		93,921	184,999
AFS Unrealized Losses	[1]	(534)	$ (3,081)
Available-for-sale Securities [Member] | AFS Fixed Income Securities [Member]
AFS Unrealized Losses 9/30/2019 compared to 12/31/2018	[1]	$ (37,300)

[1] Gross unrealized losses include non-OTTI unrealized amounts and OTTI losses recognized in AOCI. 

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Reinsurance

9 Months Ended

Sep. 30, 2019

Reinsurance Disclosures [Abstract]

Reinsurance

Reinsurance

The following table contains a listing of direct, assumed, and ceded reinsurance amounts for premiums written, premiums earned, and loss and loss expenses incurred for the periods indicated. For more information concerning reinsurance, refer to

Note 8. “Reinsurance” in Item 8. “Financial Statements and Supplementary Data.” of our 2018 Annual Report.

	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019			2018
Premiums written:
Direct	$	785,680		752,834		$	2,359,441		2,220,431
Assumed	6,882			7,084		18,770			19,891
Ceded	(115,634		)	(108,250	)	(326,939		)	(308,846	)
Net	$	676,928		651,668		$	2,051,272		1,931,476
Premiums earned:
Direct	$	752,872		706,497		$	2,221,257		2,086,953
Assumed	6,356			6,484		18,660			19,220
Ceded	(105,608		)	(98,704	)	(311,105		)	(295,232	)
Net	$	653,620		614,277		$	1,928,812		1,810,941
Loss and loss expenses incurred:
Direct	$	437,618		477,427		$	1,297,975		1,289,357
Assumed	4,362			6,529		13,975			16,897
Ceded	(43,305		)	(104,757	)	(145,712		)	(175,786	)
Net	$	398,675		379,199		$	1,166,238		1,130,468

Ceded premiums and losses related to our participation in the NFIP, under which 100% of our flood premiums, losses, and loss expenses are ceded to the NFIP, are as follows:

Ceded to NFIP	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019			2018
Ceded premiums written	$	(74,864	)	(70,100	)	$	(206,451	)	(193,110	)
Ceded premiums earned	(65,847		)	(61,448	)	(191,914		)	(180,582	)
Ceded loss and loss expenses incurred	(27,459		)	(89,396	)	(62,208		)	(115,376	)

Excluding the impact of our participation in the NFIP, ceded loss and loss expenses incurred increased in Nine Months 2019 compared to the respective prior year, due to one significant fire loss in the second quarter of 2019, which added $17.4 million to ceded loss and loss expenses. The elevated ceded loss and loss expenses incurred related to our participation in the NFIP in Third Quarter and Nine Months 2018 were due to Hurricane Florence, which impacted our footprint in September 2018.

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Statements of Cash Flows

9 Months Ended

Sep. 30, 2019

Supplemental Cash Flow Information [Abstract]

Statements of Cash Flows

Statements of Cash Flows

Supplemental cash flow information was as follows:

	Nine Months ended September 30,
($ in thousands)	2019		2018
Cash paid during the period for:
Interest	$	19,261	15,449
Federal income tax	42,000		7,193
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases1	6,062		—
Operating cash flows from financing leases	12		—
Financing cash flows from finance leases	811		4,891
Non-cash items:
Corporate actions related to fixed income securities, AFS2	29,771		32,757
Corporate actions related to equity securities2	14,250		944
Assets acquired under finance lease arrangements	824		4,114
Assets acquired under operating lease arrangements1	13,648		—
Non-cash purchase of property and equipment	108		—

¹Upon adoption of ASU 2016-02, effective January 1, 2019, we are required to disclose cash paid for amounts included in the measurement of operating lease liabilities, as well as supplemental non-cash information on operating lease liabilities arising from obtaining operating lease assets.

²Examples of such corporate actions include exchanges, non-cash acquisitions, and stock splits.

The following table provides a reconciliation of cash and restricted cash reported within the Consolidated Balance Sheets that equate to the amount reported in the Consolidated Statements of Cash Flows:

($ in thousands)	September 30, 2019		December 31, 2018
Cash	$	516	505
Restricted cash	9,647		16,414
Total cash and restricted cash shown in the Statements of Cash Flows	$	10,163	16,919

Amounts included in restricted cash represent cash received from the National Flood Insurance Program ("NFIP"), which is restricted to pay flood claims under the Write Your Own program.

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Comprehensive Income

9 Months Ended

Sep. 30, 2019

Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]

Comprehensive Income

Comprehensive Income

The components of comprehensive income, both gross and net of tax, for Third Quarter and Nine Months 2019 and Third Quarter and Nine Months 2018 were as follows:

Third Quarter 2019
($ in thousands)	Gross			Tax		Net
Net income	$	71,178		15,028		56,150
Components of OCI:
Unrealized gains on investment securities:
Unrealized holding gains during the period	34,392			7,224		27,168
Amounts reclassified into net income:
HTM securities	(3		)	(1	)	(2	)
Realized losses on disposals and OTTI of AFS securities	2,821			592		2,229
Total unrealized gains on investment securities	37,210			7,815		29,395
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	665			140		525
Total defined benefit pension and post-retirement plans	665			140		525
Other comprehensive income	37,875			7,955		29,920
Comprehensive income	$	109,053		22,983		86,070
Third Quarter 2018
($ in thousands)	Gross			Tax		Net
Net income	$	67,130		11,695		55,435
Components of other comprehensive loss:
Unrealized losses on investment securities:
Unrealized holding losses during the period	(21,565		)	(4,529	)	(17,036	)
Amounts reclassified into net income:
HTM securities	(8		)	(2	)	(6	)
Realized losses on disposals and OTTI of AFS securities	10,839			2,276		8,563
Total unrealized losses on investment securities	(10,734		)	(2,255	)	(8,479	)
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	532			112		420
Total defined benefit pension and post-retirement plans	532			112		420
Other comprehensive loss	(10,202		)	(2,143	)	(8,059	)
Comprehensive income	$	56,928		9,552		47,376

Nine Months 2019
($ in thousands)	Gross			Tax		Net
Net income	$	235,097		45,333		189,764
Components of OCI:
Unrealized gains on investment securities:
Unrealized holding gains during the period	220,864			46,381		174,483
Amounts reclassified into net income:
HTM securities	(33		)	(7	)	(26	)
Realized losses on disposals and OTTI of AFS securities	444			93		351
Total unrealized gains on investment securities	221,275			46,467		174,808
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	1,993			419		1,574
Total defined benefit pension and post-retirement plans	1,993			419		1,574
Other comprehensive income	223,268			46,886		176,382
Comprehensive income	$	458,365		92,219		366,146
Nine Months 2018
($ in thousands)	Gross			Tax		Net
Net income	$	159,586		26,407		133,179
Components of other comprehensive loss:
Unrealized losses on investment securities:
Unrealized holding losses during the period	(130,873		)	(27,484	)	(103,389	)
Amounts reclassified into net income:
HTM securities	(28		)	(6	)	(22	)
Realized losses on disposals and OTTI of AFS securities	18,258			3,834		14,424
Total unrealized losses on investment securities	(112,643		)	(23,656	)	(88,987	)
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	1,595			335		1,260
Total defined benefit pension and post-retirement plans	1,595			335		1,260
Other comprehensive loss	(111,048		)	(23,321	)	(87,727	)
Comprehensive income	$	48,538		3,086		45,452

The balances of, and changes in, each component of AOCI (net of taxes) as of September 30, 2019 were as follows:

September 30, 2019								Defined Benefit Pension and Post-Retirement Plans
	Net Unrealized Gains (Losses) on Investment Securities									Total AOCI
($ in thousands)	OTTI Related			HTM Related		All Other	Investments Subtotal
Balance, December 31, 2018	$	(71	)	71		1,888	1,888	(79,844	)	(77,956	)
OCI before reclassifications	—			—		174,483	174,483	—		174,483
Amounts reclassified from AOCI	—			(26	)	351	325	1,574		1,899
Net current period OCI	—			(26	)	174,834	174,808	1,574		176,382
Balance, September 30, 2019	$	(71	)	45		176,722	176,696	(78,270	)	98,426

The reclassifications out of AOCI were as follows:

	Quarter ended September 30,					Nine Months ended September 30,				Affected Line Item in the Unaudited Consolidated Statements of Income
($ in thousands)	2019			2018		2019		2018
HTM related
Unrealized (gains) losses on HTM disposals	$	(3	)	11		(12	)	5		Net realized and unrealized (losses) gains
Amortization of net unrealized gains on HTM securities	—			(19	)	(21	)	(33	)	Net investment income earned
	(3		)	(8	)	(33	)	(28	)	Income before federal income tax
	1			2		7		6		Total federal income tax expense
	(2		)	(6	)	(26	)	(22	)	Net income
Realized losses on AFS and OTTI
Realized losses on AFS disposals and OTTI	2,821			10,839		444		18,258		Net realized and unrealized (losses) gains
	2,821			10,839		444		18,258		Income before federal income tax
	(592		)	(2,276	)	(93	)	(3,834	)	Total federal income tax expense
	2,229			8,563		351		14,424		Net income
Defined benefit pension and post-retirement life plans
Net actuarial loss	146			112		436		337		Loss and loss expense incurred
	519			420		1,557		1,258		Other insurance expenses
Total defined benefit pension and post-retirement life	665			532		1,993		1,595		Income before federal income tax
	(140		)	(112	)	(419	)	(335	)	Total federal income tax expense
	525			420		1,574		1,260		Net income
Total reclassifications for the period	$	2,752		8,977		1,899		15,662		Net income

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Leases (Maturities of Lease Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2019		Jan. 01, 2019	Dec. 31, 2018
Lease Liabilities Payments Due [Line Items]
Finance Lease Liability, due remainder of fiscal year	$ 171
Finance lease liability, due 2020	451
Finance lease liability, due 2021	248
Finance lease liability, due 2022	54
Finance lease liability, due 2023	0
Finance lease liability, due after 2023	0
Finance lease liability, total payments	924
Finance lease imputed interest	20
Finance Lease Liability Not Yet Commenced	0
Finance lease liabilities	904	[1]	$ 900	$ 0	[1]
Operating lease liability, due remainder of fiscal year	2,071
Operating lease liability, due 2020	8,164
Operating lease liability, due 2021	6,033
Operating lease liability, due 2022	4,443
Operating lease liability, due 2023	3,232
Operating lease liability, due after 2023	11,446
Operating lease liability, total payments	35,389
Operating lease imputed interest	3,230
Operating Lease Liability Not Yet Commenced	2,941
Operating lease liability	29,218		$ 21,000
Total lease liability, due remainder of fiscal year	2,242
Total lease liability, due 2020	8,615			8,490
Total lease liability, due 2021	6,281			7,496
Total lease liability, due 2022	4,497			5,105
Total lease liability, due 2023	3,232			3,641
Total lease liability, due after 2023	11,446			9,698
Total lease liability, total payments	36,313			$ 37,330
Total imputed interest	3,250
Total Lease Liability Not Yet Commenced	2,941
Total lease liability	$ 30,122

[1] Concurrent with the adoption of ASU 2016-02 discussed in Note 2. "Adoption of Accounting Pronouncements," finance lease obligations are now captured in Long-term debt on our Consolidated Balance Sheets.

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Segment Information Narrative (Details)	9 Months Ended
	Sep. 30, 2019
Number of Operating Segments	4

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Fair Value Measurements (Quantitative Information of Our Financial Assets and Liabilities That Were Disclosed at Fair Value) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities, fair value	$ 28,356	$ 38,317
Long-term debt, fair value	657,267	448,622
Seven Point Twenty Five Percent Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	65,770	57,032
Six Point Seventy Percent Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	125,954	107,075
Five Point Three Hundred Seventy Five Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	352,156	0
Five Point Eight Hundred Seventy Five Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	177,230
One Point Sixty One Percent Borrowing From Federal Home Loan Bank Due July 21, 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	24,838	24,218
One Point Fifty Six Percent Borrowing From Federal Home Loan Bank Due August 16, 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	24,808	24,162
Three Point Zero Three Percent Borrowing From Federal Home Loan Bank Due December 16, 2026 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	63,741	58,905
Long-term Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	657,267	448,622
Obligations of States and Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities, fair value	9,426	17,969
Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities, fair value	18,930	20,348
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities, fair value	0	0
Long-term debt, fair value	0	177,230
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Six Point Seventy Percent Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Five Point Three Hundred Seventy Five Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Five Point Eight Hundred Seventy Five Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value		177,230
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | One Point Sixty One Percent Borrowing From Federal Home Loan Bank Due July 21, 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | One Point Fifty Six Percent Borrowing From Federal Home Loan Bank Due August 16, 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Three Point Zero Three Percent Borrowing From Federal Home Loan Bank Due December 16, 2026 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities, fair value	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities, fair value	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities, fair value	28,356	38,317
Long-term debt, fair value	657,267	271,392
Significant Other Observable Inputs (Level 2) [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	65,770	57,032
Significant Other Observable Inputs (Level 2) [Member] | Six Point Seventy Percent Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	125,954	107,075
Significant Other Observable Inputs (Level 2) [Member] | Five Point Three Hundred Seventy Five Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	352,156
Significant Other Observable Inputs (Level 2) [Member] | Five Point Eight Hundred Seventy Five Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value		0
Significant Other Observable Inputs (Level 2) [Member] | One Point Sixty One Percent Borrowing From Federal Home Loan Bank Due July 21, 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	24,838	24,218
Significant Other Observable Inputs (Level 2) [Member] | One Point Fifty Six Percent Borrowing From Federal Home Loan Bank Due August 16, 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	24,808	24,162
Significant Other Observable Inputs (Level 2) [Member] | Three Point Zero Three Percent Borrowing From Federal Home Loan Bank Due December 16, 2026 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	63,741	58,905
Significant Other Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities, fair value	9,426	17,969
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities, fair value	18,930	20,348
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities, fair value	0	0
Long-term debt, fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Six Point Seventy Percent Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Five Point Three Hundred Seventy Five Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0
Significant Unobservable Inputs (Level 3) [Member] | Five Point Eight Hundred Seventy Five Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value		0
Significant Unobservable Inputs (Level 3) [Member] | One Point Sixty One Percent Borrowing From Federal Home Loan Bank Due July 21, 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | One Point Fifty Six Percent Borrowing From Federal Home Loan Bank Due August 16, 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Three Point Zero Three Percent Borrowing From Federal Home Loan Bank Due December 16, 2026 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities, fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities, fair value	$ 0	$ 0

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fixed income securities, held-to-maturity, fair value	$ 28,356	$ 38,317
Fixed income securities, available-for-sale, amortized cost	5,706,656	5,270,798
Equity securities, cost	77,779	138,144
Premiums receivable, allowance for uncollectible accounts	7,800	9,400
Reinsurance recoverable, allowance for uncollectible accounts	4,400	4,500
Property and equipment - at cost, accumulated depreciation and amortization	$ 223,518	$ 211,657
Preferred stock, par value per share	$ 0	$ 0
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value per share	$ 2	$ 2
Common stock, shares authorized	360,000,000	360,000,000
Common stock, shares issued	103,421,301	102,848,394
Treasury stock - at cost, shares	44,021,732	43,899,840

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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net realized and unrealized investment (losses) gains	$ (2,183)	$ (4,787)	$ 15,295	$ (16,988)
Net investment income	(55,826)	(52,443)	(164,949)	(141,227)
Loss and loss expense incurred	398,675	379,199	1,166,238	1,130,468
Other insurance expenses	90,234	80,108	261,975	244,342
Income before federal income tax	71,178	67,130	235,097	159,586
Total federal income tax expense	(15,028)	(11,695)	(45,333)	(26,407)
Net income	56,150	55,435	189,764	133,179
Reclassification out of AOCI
Net income	2,752	8,977	1,899	15,662
Pension Plan [Member] | Reclassification out of AOCI
Loss and loss expense incurred	146	112	436	337
Other insurance expenses	519	420	1,557	1,258
Income before federal income tax	665	532	1,993	1,595
Total federal income tax expense	(140)	(112)	(419)	(335)
Net income	525	420	1,574	1,260
Held-to-maturity Securities [Member] | Reclassification out of AOCI
Net realized and unrealized investment (losses) gains	(3)	11	(12)	5
Net investment income	0	(19)	(21)	(33)
Income before federal income tax	(3)	(8)	(33)	(28)
Total federal income tax expense	1	2	7	6
Net income	(2)	(6)	(26)	(22)
Available-for-sale Securities [Member] | Reclassification out of AOCI
Net realized and unrealized investment (losses) gains	2,821	10,839	444	18,258
Income before federal income tax	2,821	10,839	444	18,258
Total federal income tax expense	(592)	(2,276)	(93)	(3,834)
Net income	$ 2,229	$ 8,563	$ 351	$ 14,424

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Retirement Plans (Components of Net Periodic Benefit Cost) (Details) - Pension Plan [Member] - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost		$ 3,376	$ 3,095	$ 10,129	$ 9,285
Expected return on plan assets		(5,278)	(5,681)	(15,835)	(17,044)
Amortization of unrecognized net actuarial loss		644	494	1,931	1,481
Total net periodic cost (benefit)	[1]	$ (1,258)	$ (2,092)	$ (3,775)	$ (6,278)

[1] The components of net periodic pension cost (benefit) are included within "Loss and loss expense incurred" and "Other insurance expenses" on the Consolidated Statements of Income.

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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	Sep. 30, 2019	Sep. 30, 2018
Preferred stock, par value per share	$ 0	$ 0
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Series A Preferred Stock [Member]
Preferred stock, par value per share	$ 0	$ 0
Preferred stock, shares authorized	300,000	300,000

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Leases (Lease Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2019		Jan. 01, 2019	Dec. 31, 2018	[1]
Lease Assets and Liabilities [Line Items]
Operating leases, Other assets	$ 28,348		$ 20,700
Operating leases, Other liabilities	29,218		21,000
Finance leases, Property and equipment - at cost, net of accumulated depreciation and amortization	899		900
Finance leases, Long-term debt	$ 904	[1]	$ 900	$ 0

[1] Concurrent with the adoption of ASU 2016-02 discussed in Note 2. "Adoption of Accounting Pronouncements," finance lease obligations are now captured in Long-term debt on our Consolidated Balance Sheets.

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Investments (Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Investment Income [Line Items]
Net investment income earned	$ 55,826	$ 52,443	$ 164,949	$ 141,227
Fixed Income Securities [Member]
Net Investment Income [Line Items]
Net investment income earned	50,749	45,088	150,689	130,903
Equity Securities [Member]
Net Investment Income [Line Items]
Net investment income earned	1,885	2,079	5,265	5,876
Short-Term Investments [Member]
Net Investment Income [Line Items]
Net investment income earned	1,410	867	5,213	2,001
Other Investments [Member]
Net Investment Income [Line Items]
Net investment income earned	5,267	7,211	13,421	10,868
Investment Expenses [Member]
Net Investment Income [Line Items]
Net investment income earned	$ (3,485)	$ (2,802)	$ (9,639)	$ (8,421)

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Investments (Net Realized Gains (Losses) on Disposals) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schedule of Realized Gains (Losses) on Disposals Excluding OTTI [Line Items]
HTM fixed income securities Gains	$ 0	$ 0	$ 1	$ 2
HTM fixed income securities Losses	0	0	(15)	0
Equity securities Gains	21,630	10,584	24,868	20,209
Equity securities Losses	(28)	(1,919)	(135)	(2,249)
Short-term investments Gains	2	3	18	6
Short-term investments Losses	(38)	(1)	(39)	(5)
Other investments Gains	0	0	7	0
Other investments Losses	0	(5)	(30)	(5)
Net realized investment gains on disposals	20,425	(751)	26,752	4,034
Proceeds from sale of fixed income securities, AFS	89,700	444,400	461,825	1,382,677
Proceeds from sale of equity securities	95,200	36,100	125,302	79,676
Fixed Maturities [Member]
Schedule of Realized Gains (Losses) on Disposals Excluding OTTI [Line Items]
AFS securities Gains	1,078	462	5,565	5,056
AFS securities Losses	$ (2,219)	$ (9,875)	$ (3,488)	$ (18,980)

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Reserve for Loss and Loss Expense (Tables)

9 Months Ended

Sep. 30, 2019

Insurance Loss Reserves [Abstract]

Schedule of Liability for Unpaid Claims and Claims Adjustment Expense

	Nine Months ended September 30,
($ in thousands)	2019			2018
Gross reserve for loss and loss expense, at beginning of year	$	3,893,868		3,771,240
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year	537,388			585,855
Net reserve for loss and loss expense, at beginning of year	3,356,480			3,185,385
Incurred loss and loss expense for claims occurring in the:
Current year	1,200,878			1,148,032
Prior years	(34,640		)	(17,564	)
Total incurred loss and loss expense	1,166,238			1,130,468
Paid loss and loss expense for claims occurring in the:
Current year	384,436			369,036
Prior years	631,589			610,734
Total paid loss and loss expense	1,016,025			979,770
Net reserve for loss and loss expense, at end of period	3,506,693			3,336,083
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period	548,938			589,072
Gross reserve for loss and loss expense at end of period	$	4,055,631		3,925,155

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Investments (Tables)

9 Months Ended

Sep. 30, 2019

Investments [Line Items]

Schedule of Available-for-sale Securities

September 30, 2019
($ in thousands)	Cost/ Amortized Cost		Unrealized Gains	Unrealized Losses		Fair Value
AFS fixed income securities:
U.S. government and government agencies	$	116,555	4,357	(12	)	120,900
Foreign government	20,947		573	—		21,520
Obligations of states and political subdivisions	1,127,709		62,910	(4	)	1,190,615
Corporate securities	1,762,981		78,345	(2,399	)	1,838,927
Collateralized loan obligations and other asset-backed securities ("CLO and other ABS")	764,038		8,998	(4,653	)	768,383
Commercial mortgage-backed securities ("CMBS")	524,441		31,435	(145	)	555,731
Residential mortgage-backed securities (“RMBS”)	1,389,985		44,710	(534	)	1,434,161
Total AFS fixed income securities	$	5,706,656	231,328	(7,747	)	5,930,237

December 31, 2018
($ in thousands)	Cost/ Amortized Cost		Unrealized Gains	Unrealized Losses		Fair Value
AFS fixed income securities:
U.S. government and government agencies	$	120,092	1,810	(592	)	121,310
Foreign government	23,202		36	(107	)	23,131
Obligations of states and political subdivisions	1,121,615		19,485	(2,631	)	1,138,469
Corporate securities	1,639,852		5,521	(27,965	)	1,617,408
CLO and other ABS	720,193		4,112	(6,943	)	717,362
CMBS	527,409		3,417	(3,748	)	527,078
RMBS	1,118,435		12,988	(3,081	)	1,128,342
Total AFS fixed income securities	$	5,270,798	47,369	(45,067	)	5,273,100

Schedule of Fair Value and Gross Pre-Tax Net Unrealized Loss of Securities by Length of Time, AFS

September 30, 2019	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	$	5,014	(11	)	498	(1	)	5,512	(12	)
Obligations of states and political subdivisions	437		(4	)	—	—		437	(4	)
Corporate securities	89,919		(1,862	)	15,867	(537	)	105,786	(2,399	)
CLO and other ABS	176,999		(2,458	)	180,898	(2,195	)	357,897	(4,653	)
CMBS	59,857		(126	)	7,665	(19	)	67,522	(145	)
RMBS	84,408		(503	)	9,513	(31	)	93,921	(534	)
Total AFS fixed income securities	$	416,634	(4,964	)	214,441	(2,783	)	631,075	(7,747	)

December 31, 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	$	6,693	(174	)	23,163	(418	)	29,856	(592	)
Foreign government	12,208		(93	)	1,482	(14	)	13,690	(107	)
Obligations of states and political subdivisions	196,798		(2,074	)	42,821	(557	)	239,619	(2,631	)
Corporate securities	1,041,952		(23,649	)	78,953	(4,316	)	1,120,905	(27,965	)
CLO and other ABS	516,106		(6,750	)	16,800	(193	)	532,906	(6,943	)
CMBS	229,338		(2,548	)	66,294	(1,200	)	295,632	(3,748	)
RMBS	139,338		(1,660	)	45,661	(1,421	)	184,999	(3,081	)
Total AFS fixed income securities	$	2,142,433	(36,948	)	275,174	(8,119	)	2,417,607	(45,067	)

  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	$	310,387	4,754	4,773
Due after one year through five years	3,296,126		16,334	17,589
Due after five years through 10 years	2,191,633		5,837	5,994
Due after 10 years	132,091		—	—
Total fixed income securities	$	5,930,237	26,925	28,356

Schedule of Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy

Other Investments	September 30, 2019				December 31, 2018
($ in thousands)	Carrying Value		Remaining Commitment	Maximum Exposure to Loss1	Carrying Value	Remaining Commitment	Maximum Exposure to Loss1
Alternative Investments
Private equity	$	105,922	97,552	203,474	84,352	93,688	178,040
Private credit	37,710		109,797	147,507	41,682	81,453	123,135
Real assets	21,828		22,534	44,362	27,862	27,129	54,991
Total alternative investments	165,460		229,883	395,343	153,896	202,270	356,166
Other securities	23,783		—	23,783	25,042	—	25,042
Total other investments	$	189,243	229,883	419,126	178,938	202,270	381,208

¹The maximum exposure to loss includes both the carry value of these investments and the related remaining 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)	2019			2018	2019	2018
Net investment (loss) income	$	(14.0	)	11.9	10.1	(29.9	)
Realized gains	121.1			124.8	370.4	1,348.3
Net change in unrealized appreciation (depreciation)	1,739.4			1,434.3	4,517.4	695.8
Net income	$	1,846.5		1,571.0	4,897.9	2,014.2
Insurance subsidiaries’ alternative investments income	$	5.2		7.1	13.0	10.6

Schedule of Securities Pledged As Collateral

($ in millions)	FHLBI Collateral		FHLBNY Collateral	State and Regulatory Deposits	Total
U.S. government and government agencies	$	—	—	22.9	22.9
Obligations of states and political subdivisions	—		—	3.9	3.9
Corporate securities	—		—	0.3	0.3
CMBS	7.3		19.6	—	26.9
RMBS	57.4		81.1	—	138.5
Total pledged as collateral	$	64.7	100.7	27.1	192.5

Schedule of Pre-Tax Net Investment Income Earned

	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019		2018
Fixed income securities	$	50,749		45,088		150,689		130,903
Equity securities	1,885			2,079		5,265		5,876
Short-term investments	1,410			867		5,213		2,001
Other investments	5,267			7,211		13,421		10,868
Investment expenses	(3,485		)	(2,802	)	(9,639	)	(8,421	)
Net investment income earned	$	55,826		52,443		164,949		141,227

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)	2019			2018		2019			2018
Net realized gains (losses) on the disposals of securities:
Fixed income securities	$	(1,141	)	(9,413	)	2,063			(13,922	)
Equity securities	21,602			8,665		24,733			17,960
Short-term investments	(36		)	2		(21		)	1
Other investments	—			(5	)	(23		)	(5	)
Net realized gains (losses) on the disposal of securities	20,425			(751	)	26,752			4,034
OTTI charges	(2,291		)	(1,426	)	(3,366		)	(5,459	)
Net realized gains (losses)	18,134			(2,177	)	23,386			(1,425	)
Unrealized (losses) recognized in income on equity securities	(20,317		)	(2,610	)	(8,091		)	(15,563	)
Total net realized and unrealized investment (losses) gains	$	(2,183	)	(4,787	)	$	15,295		(16,988	)

Schedule of Realized Gains and Losses on Disposals of Securities

	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019		2018
HTM fixed income securities
Gains	$	—		—		1		2
Losses	—			—		(15	)	—
AFS fixed income securities
Gains	1,078			462		5,565		5,056
Losses	(2,219		)	(9,875	)	(3,488	)	(18,980	)
Equity securities
Gains	21,630			10,584		24,868		20,209
Losses	(28		)	(1,919	)	(135	)	(2,249	)
Short-term investments
Gains	2			3		18		6
Losses	(38		)	(1	)	(39	)	(5	)
Other investments
Gains	—			—		7		—
Losses	—			(5	)	(30	)	(5	)
Total net realized gains on disposals of securities	$	20,425		(751	)	26,752		4,034

Equity Securities [Member]

Investments [Line Items]

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)	2019			2018		2019			2018
Unrealized gains (losses) recognized in income on equity securities:
On securities remaining in our portfolio at September 30, 2019	$	1,109		5,476		1,805			4,199
On securities sold in each respective period	(21,426		)	(8,086	)	(9,896		)	(19,762	)
Total unrealized (losses) recognized in income on equity securities	$	(20,317	)	(2,610	)	$	(8,091	)	(15,563	)

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Leases (Supplemental Lease Information) (Details)	Sep. 30, 2019
Supplemental Lease Information [Line Items]
Weighted average remaining lease term, operating leases	6 years
Weighted average remaining lease term, finance leases	2 years
Weighted average discount rate, operating leases	3.40%
Weighted average discount rate, finance leases	2.00%	[1]

[1] Prior to adoption of ASU 2016-02, our historical capital lease liability and asset were measured using an un-discounted cash flow stream due to immateriality of the capital lease population.

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Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
ASSETS
Fixed income securities, held-to-maturity – at carrying value (fair value: $28,356 – 2019; $38,317 – 2018)	$ 26,925	$ 37,110
Fixed income securities, available-for-sale – at fair value (amortized cost: $5,706,656 – 2019; $5,270,798 – 2018)	5,930,237	5,273,100
Equity securities – at fair value (cost: $77,779 – 2019; $138,144 – 2018)	79,213	147,639
Short-term investments (at cost which approximates fair value)	326,121	323,864
Other investments	189,243	178,938
Total investments (Note 4 and 6)	6,551,739	5,960,651
Cash	516	505
Restricted cash	9,647	16,414
Interest and dividends due or accrued	42,975	41,620
Premiums receivable, net of allowance for uncollectible accounts of: $7,800 – 2019; $9,400 – 2018	860,480	770,518
Reinsurance recoverable, net of allowance for uncollectible accounts of: $4,400 – 2019; $4,500 – 2018	575,984	549,172
Prepaid reinsurance premiums	173,557	157,723
Deferred federal income tax	5,509	53,540
Property and equipment – at cost, net of accumulated depreciation and amortization of: $223,518 – 2019; $211,657 – 2018	76,423	65,248
Deferred policy acquisition costs	279,239	252,612
Goodwill	7,849	7,849
Other assets	135,488	76,877
Total assets	8,719,406	7,952,729
Liabilities And Stockholders' Equity
Reserve for loss and loss expense (Note 8)	4,055,631	3,893,868
Unearned premiums	1,570,226	1,431,932
Long-term Debt	550,669
Long-term Debt		439,540
Current federal income tax	2,656	1,302
Accrued salaries and benefits	100,445	116,706
Other liabilities	302,403	277,579
Total liabilities	6,582,030	6,160,927
Stockholders' Equity:
Preferred stock of $0 par value per share: Authorized shares: 5,000,000; no shares issued or outstanding	0	0
Common stock of $2 par value per share: Authorized shares: 360,000,000; Issued: 103,421,301 – 2019; 102,848,394 – 2018	206,843	205,697
Additional paid-in capital	412,347	390,315
Retained earnings	2,012,499	1,858,414
Accumulated other comprehensive income (loss) (Note 11)	98,426	(77,956)
Treasury stock – at cost (shares: 44,021,732 – 2019; 43,899,840 – 2018)	(592,739)	(584,668)
Total stockholders' equity	2,137,376	1,791,802
Commitments and contingencies
Total liabilities and stockholders' equity	$ 8,719,406	$ 7,952,729

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Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2018			$ (77,956)
Amounts reclassified from AOCI, Non-credit OTTI			0
Amounts reclassified from AOCI, HTM related	$ (2)	$ (6)	(26)	$ (22)
Amounts reclassified from AOCI, All Other	2,229	8,563	351	14,424
OCI before reclassifications, Defined Benefit Pension and Post Retirement Plans			0
Amount reclassified into net income: Net actuarial loss	525	420	1,574	1,260
Other comprehensive income (loss)	29,920	(8,059)	176,382	(87,727)
Other comprehensive income, defined pension and post retirement plans	525	420	1,574	1,260
Ending Balance, September 30, 2019	98,426		98,426
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2018			1,888
OCI before reclassifications			174,483
Other comprehensive income (loss)			174,834
Ending Balance, September 30, 2019	176,722		176,722
Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2018			1,888
OCI before reclassifications			174,483
Amounts reclassified from AOCI			325
Other comprehensive income (loss)			174,808
Ending Balance, September 30, 2019	176,696		176,696
Accumulated Other-than-Temporary Impairment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2018			(71)
OCI before reclassifications			0
Other comprehensive income (loss)			0
Ending Balance, September 30, 2019	(71)		(71)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Held-to-maturity Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2018			71
OCI before reclassifications			0
Other comprehensive income (loss)			(26)
Ending Balance, September 30, 2019	45		45
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2018			(79,844)
Amount reclassified into net income: Net actuarial loss			1,574
Ending Balance, September 30, 2019	(78,270)		(78,270)
Accumulated other comprehensive income (loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2018			(77,956)
OCI before reclassifications			174,483
Amounts reclassified from AOCI			1,899
Other comprehensive income (loss)	29,920	$ (8,059)	176,382	$ (87,727)
Ending Balance, September 30, 2019	$ 98,426		$ 98,426

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Segment Information (Reconciliation of Segment Results to Income Before Federal Income Tax (Details)) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Investment income, before federal income tax	$ 53,643	$ 47,656	$ 180,244	$ 124,239
Interest expense	(7,397)	(6,073)	(26,289)	(18,350)
Corporate expenses	(6,369)	(7,450)	(28,345)	(22,065)
Income before federal income tax	71,178	67,130	235,097	159,586
Standard Commercial Lines [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Underwriting gain (loss), before federal income tax	30,016	26,333	92,974	74,153
Standard Personal Lines [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Underwriting gain (loss), before federal income tax	(631)	3,158	7,074	6,457
Excess And Surplus Operations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Underwriting gain (loss), before federal income tax	1,916	3,506	9,439	(4,848)
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total income, before federal income tax all segments	$ 84,944	$ 80,653	$ 289,731	$ 200,001

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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional paid-in capital [Member]	Retained Earnings [Member]	Accumulated other comprehensive income (loss) [Member]	Treasury stock [Member]
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01 [Member]				$ 30,726	$ (30,726)
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 [Member]				(5,707)	5,707
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member]				0
Balance at beginning of year, as adjusted				1,723,632	(4,849)
Beginning of year at Dec. 31, 2017		$ 204,569	$ 367,717	1,698,613	20,170	$ (578,112)
Dividend reinvestment plan		35	1,013
Stock purchase and compensation plans		969	16,721
Net income	$ 133,179			133,179
Dividends to stockholders				(32,204)
Other comprehensive income (loss)	(87,727)				(87,727)
Acquisition of treasury stock						(6,423)
End of period at Sep. 30, 2018	$ 1,738,520	205,573	385,451	1,824,607	(92,576)	(584,535)
Dividends declared per share to stockholders	$ 0.54
Common stock, shares outstanding, beginning of period at Dec. 31, 2017	58,495,122
Dividend reinvestment plan, shares	17,683
Stock purchase and compensation plan, shares	484,491
Acquisition of treasury stock, shares	(108,311)
Common stock, shares outstanding, end of period at Sep. 30, 2018	58,888,985
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01 [Member]				0	0
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 [Member]				0	0
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member]				0
Balance at beginning of year, as adjusted				1,779,928	(84,517)
Beginning of year at Jun. 30, 2018		205,460	381,641	1,779,928	(84,517)	(584,357)
Dividend reinvestment plan		10	327
Stock purchase and compensation plans		103	3,483
Net income	$ 55,435			55,435
Dividends to stockholders				(10,756)
Other comprehensive income (loss)	(8,059)				(8,059)
Acquisition of treasury stock						(178)
End of period at Sep. 30, 2018	$ 1,738,520	205,573	385,451	1,824,607	(92,576)	(584,535)
Dividends declared per share to stockholders	$ 0.18
Common stock, shares outstanding, beginning of period at Jun. 30, 2018	58,835,052
Dividend reinvestment plan, shares	5,310
Stock purchase and compensation plan, shares	51,482
Acquisition of treasury stock, shares	(2,859)
Common stock, shares outstanding, end of period at Sep. 30, 2018	58,888,985
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01 [Member]				0	0
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 [Member]				0	0
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member]				342
Balance at beginning of year, as adjusted				1,858,756	(77,956)
Beginning of year at Dec. 31, 2018	$ 1,791,802	205,697	390,315	1,858,414	(77,956)	(584,668)
Dividend reinvestment plan		31	1,095
Stock purchase and compensation plans		1,115	20,937
Net income	189,764			189,764
Dividends to stockholders				(36,021)
Other comprehensive income (loss)	176,382				176,382
Acquisition of treasury stock						(8,071)
End of period at Sep. 30, 2019	$ 2,137,376	206,843	412,347	2,012,499	98,426	(592,739)
Dividends declared per share to stockholders	$ 0.60
Common stock, shares outstanding, beginning of period at Dec. 31, 2018	58,948,554
Dividend reinvestment plan, shares	15,650
Stock purchase and compensation plan, shares	557,257
Acquisition of treasury stock, shares	(121,892)
Common stock, shares outstanding, end of period at Sep. 30, 2019	59,399,569
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01 [Member]				0	0
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 [Member]				0	0
Balance at beginning of year, as adjusted				1,968,374	68,506
Beginning of year at Jun. 30, 2019		206,665	407,382	1,968,374	68,506	(591,383)
Dividend reinvestment plan		9	366
Stock purchase and compensation plans		169	4,599
Net income	$ 56,150			56,150
Dividends to stockholders				(12,025)
Other comprehensive income (loss)	29,920				29,920
Acquisition of treasury stock						(1,356)
End of period at Sep. 30, 2019	$ 2,137,376	$ 206,843	$ 412,347	2,012,499	$ 98,426	$ (592,739)
Dividends declared per share to stockholders	$ 0.20
Common stock, shares outstanding, beginning of period at Jun. 30, 2019	59,328,108
Dividend reinvestment plan, shares	4,738
Stock purchase and compensation plan, shares	83,979
Acquisition of treasury stock, shares	(17,256)
Common stock, shares outstanding, end of period at Sep. 30, 2019	59,399,569
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member]				$ 0

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Investments (OTTI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Investments [Abstract]
OTTI Charges	$ 2,291	$ 1,426	$ 3,366	$ 5,459

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Indebtedness (Schedule of Outstanding Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2019		Jan. 01, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt Discount and Unamortized Issuance Cost	$ 10,235
Finance lease liabilities	904	[1]	$ 900	$ 0	[1]
Long-term Debt	$ 550,669
Long-term Debt				439,540
Five Point Three Hundred Seventy Five Senior Notes [Member]
Debt Instrument [Line Items]
Interest Rate	5.375%
Original Amount	$ 300,000
Debt Discount and Unamortized Issuance Cost	9,065
Long-term Debt	$ 290,935
Long-term Debt				0
Five Point Eight Hundred Seventy Five Senior Notes [Member]
Debt Instrument [Line Items]
Interest Rate	5.875%
Original Amount	$ 185,000
Debt Discount and Unamortized Issuance Cost	0
Long-term Debt	$ 0
Long-term Debt				180,771
Three Point Zero Three Percent Borrowing From Federal Home Loan Bank Due December 16, 2026 [Member]
Debt Instrument [Line Items]
Interest Rate	3.03%
Original Amount	$ 60,000
Debt Discount and Unamortized Issuance Cost	0
Long-term Debt	$ 60,000
Long-term Debt				60,000
One Point Fifty Six Percent Borrowing From Federal Home Loan Bank Due August 16, 2021 [Member]
Debt Instrument [Line Items]
Interest Rate	1.56%
Original Amount	$ 25,000
Debt Discount and Unamortized Issuance Cost	0
Long-term Debt	$ 25,000
Long-term Debt				25,000
One Point Sixty One Percent Borrowing From Federal Home Loan Bank Due July 21, 2021 [Member]
Debt Instrument [Line Items]
Interest Rate	1.61%
Original Amount	$ 25,000
Debt Discount and Unamortized Issuance Cost	0
Long-term Debt	$ 25,000
Long-term Debt				25,000
Six Point Seventy Percent Senior Notes [Member]
Debt Instrument [Line Items]
Interest Rate	6.70%
Original Amount	$ 100,000
Debt Discount and Unamortized Issuance Cost	889
Long-term Debt	$ 99,111
Long-term Debt				99,069
Seven Point Twenty Five Percent Senior Notes [Member]
Debt Instrument [Line Items]
Interest Rate	7.25%
Original Amount	$ 50,000
Debt Discount and Unamortized Issuance Cost	281
Long-term Debt	$ 49,719
Long-term Debt				$ 49,700

[1] Concurrent with the adoption of ASU 2016-02 discussed in Note 2. "Adoption of Accounting Pronouncements," finance lease obligations are now captured in Long-term debt on our Consolidated Balance Sheets.

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Reinsurance (Tables)

9 Months Ended

Sep. 30, 2019

Reinsurance Disclosures [Abstract]

Schedule of List Of Direct, Assumed, And Ceded Reinsurance Amounts

	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019			2018
Premiums written:
Direct	$	785,680		752,834		$	2,359,441		2,220,431
Assumed	6,882			7,084		18,770			19,891
Ceded	(115,634		)	(108,250	)	(326,939		)	(308,846	)
Net	$	676,928		651,668		$	2,051,272		1,931,476
Premiums earned:
Direct	$	752,872		706,497		$	2,221,257		2,086,953
Assumed	6,356			6,484		18,660			19,220
Ceded	(105,608		)	(98,704	)	(311,105		)	(295,232	)
Net	$	653,620		614,277		$	1,928,812		1,810,941
Loss and loss expenses incurred:
Direct	$	437,618		477,427		$	1,297,975		1,289,357
Assumed	4,362			6,529		13,975			16,897
Ceded	(43,305		)	(104,757	)	(145,712		)	(175,786	)
Net	$	398,675		379,199		$	1,166,238		1,130,468

Schedule of Ceded Premiums and Losses Related to Flood Operations

Ceded to NFIP	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019			2018
Ceded premiums written	$	(74,864	)	(70,100	)	$	(206,451	)	(193,110	)
Ceded premiums earned	(65,847		)	(61,448	)	(191,914		)	(180,582	)
Ceded loss and loss expenses incurred	(27,459		)	(89,396	)	(62,208		)	(115,376	)

Excluding the impact of our participation in the NFIP, ceded loss and loss expenses incurred increased in Nine Months 2019 compared to the respective prior year, due to one significant fire loss in the second quarter of 2019, which added $17.4 million to ceded loss and loss expenses. The elevated ceded loss and loss expenses incurred related to our participation in the NFIP in Third Quarter and Nine Months 2018 were due to Hurricane Florence, which impacted our footprint in September 2018.

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Statements of Cash Flow (Tables)

9 Months Ended

Sep. 30, 2019

Supplemental Cash Flow Information [Abstract]

Schedule of Cash Flow, Supplemental Disclosures

	Nine Months ended September 30,
($ in thousands)	2019		2018
Cash paid during the period for:
Interest	$	19,261	15,449
Federal income tax	42,000		7,193
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases1	6,062		—
Operating cash flows from financing leases	12		—
Financing cash flows from finance leases	811		4,891
Non-cash items:
Corporate actions related to fixed income securities, AFS2	29,771		32,757
Corporate actions related to equity securities2	14,250		944
Assets acquired under finance lease arrangements	824		4,114
Assets acquired under operating lease arrangements1	13,648		—
Non-cash purchase of property and equipment	108		—

¹Upon adoption of ASU 2016-02, effective January 1, 2019, we are required to disclose cash paid for amounts included in the measurement of operating lease liabilities, as well as supplemental non-cash information on operating lease liabilities arising from obtaining operating lease assets.

²Examples of such corporate actions include exchanges, non-cash acquisitions, and stock splits.

Schedule of Cash and Restricted Cash

($ in thousands)	September 30, 2019		December 31, 2018
Cash	$	516	505
Restricted cash	9,647		16,414
Total cash and restricted cash shown in the Statements of Cash Flows	$	10,163	16,919

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Statements of Cash Flows (Schedule of Cash and Restricted Cash) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Schedule of Cash and Restricted Cash [Line Items]
Cash	$ 516	$ 505
Restricted cash	9,647	16,414
Total cash and restricted cash shown in the Statements of Cash Flows	$ 10,163	$ 16,919	$ 12,832	$ 44,710

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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule of Fixed Income Securities [Line Items]
Due in one year or less fair value, AFS	$ 310,387
Due after one year through five years fair value, AFS	3,296,126
Due after five years through 10 years fair value, AFS	2,191,633
Due after 10 years fair value, AFS	132,091
AFS, Fair Value	5,930,237	$ 5,273,100
Due in one year or less carrying value, HTM	4,754
Due after one year through five years carrying value, HTM	16,334
Due after five years through 10 years carrying value, HTM	5,837
Due after 10 years carrying value, HTM	0
HTM, Carrying Value	26,925	37,110
Due in one year or less fair value, HTM	4,773
Due after one year through five years fair value, HTM	17,589
Due after five years through 10 years fair value, HTM	5,994
Due after 10 years fair value, HTM	0
HTM, Fair Value	$ 28,356	$ 38,317

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Retirement Plans

9 Months Ended

Sep. 30, 2019

Retirement Benefits [Abstract]

Retirement Plans

Retirement Plans

SICA's primary pension plan is the Retirement Income Plan for Selective Insurance Company of America (the “Pension Plan”). SICA also sponsors the Supplemental Excess Retirement Plan (the “Excess Plan”) and a life insurance benefit plan. All plans are closed to new entrants and benefits ceased accruing under the Pension Plan and the Excess Plan after March 31, 2016. For more information concerning SICA's retirement plans, refer to Note 14. “Retirement Plans” in Item 8. “Financial Statements and Supplementary Data.” of our 2018 Annual Report.

The following tables provide information regarding the Pension Plan:

	Pension Plan					Pension Plan
	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019		2018
Net Periodic Pension Cost (Benefit):
Interest cost	$	3,376		3,095		10,129		9,285
Expected return on plan assets	(5,278		)	(5,681	)	(15,835	)	(17,044	)
Amortization of unrecognized net actuarial loss	644			494		1,931		1,481
Total net periodic pension cost (benefit)1	$	(1,258	)	(2,092	)	(3,775	)	(6,278	)

¹ The components of net periodic pension cost (benefit) are included within "Loss and loss expense incurred" and "Other insurance expenses" on the Consolidated Statements of Income.

	Pension Plan
	Nine Months ended September 30,
	2019		2018
Weighted-Average Expense Assumptions:
Discount rate	4.46	%	3.78	%
Effective interest rate for calculation of interest cost	4.12		3.46
Expected return on plan assets	6.50		6.36

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Fair Value Measurements

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The financial assets in our investment portfolio are primarily measured at fair value as disclosed on the Consolidated Balance Sheets. The following table presents the carrying amounts and estimated fair values of our financial liabilities as of September 30, 2019 and December 31, 2018:

	September 30, 2019			December 31, 2018
($ in thousands)	Carrying Amount		Fair Value	Carrying Amount		Fair Value
Financial Liabilities
Long-term debt:
7.25% Senior Notes	49,909		65,770	49,907		57,032
6.70% Senior Notes	99,476		125,954	99,462		107,075
5.875% Senior Notes	—		—	185,000		177,230
5.375% Senior Notes	294,136		352,156	—		—
1.61% borrowings from FHLBNY	25,000		24,838	25,000		24,218
1.56% borrowings from FHLBNY	25,000		24,808	25,000		24,162
3.03% borrowings from FHLBI	60,000		63,741	60,000		58,905
Subtotal long-term debt	553,521		657,267	444,369		448,622
Unamortized debt issuance costs	(3,756	)		(4,829	)
Finance lease obligations	904			—
Total long-term debt	550,669			439,540

For a discussion of our long-term debt activity in 2019, see Note 5. "Indebtedness" in this Form 10-Q, and for a discussion of the fair value hierarchy and techniques used to value our financial assets and liabilities, refer to Note 2. "Summary of Significant Accounting Policies" in Item 8. "Financial Statements and Supplementary Data." of our 2018 Annual Report.

The following tables provide quantitative disclosures of our financial assets that were measured and recorded at fair value at September 30, 2019 and December 31, 2018:

September 30, 2019			Fair Value Measurements Using
($ in thousands)	Assets Measured at Fair Value		Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)1	Significant Other  Observable Inputs  (Level 2)1	Significant Unobservable  Inputs  (Level 3)
Description
Measured on a recurring basis:
AFS fixed income securities:
U.S. government and government agencies	$	120,900	41,619	79,281	—
Foreign government	21,520		—	21,520	—
Obligations of states and political subdivisions	1,190,615		—	1,190,615	—
Corporate securities	1,838,927		—	1,822,577	16,350
CLO and other ABS	768,383		—	748,504	19,879
CMBS	555,731		—	555,731	—
RMBS	1,434,161		—	1,434,161	—
Total AFS fixed income securities	5,930,237		41,619	5,852,389	36,229
Equity securities:
Common stock2	76,179		42,988	—	—
Preferred stock	3,034		3,034	—	—
Total equity securities	79,213		46,022	—	—
Short-term investments	326,121		319,599	6,522	—
Total assets measured at fair value	$	6,335,571	407,240	5,858,911	36,229

December 31, 2018			Fair Value Measurements Using
($ in thousands)	Assets Measured at Fair Value		Quoted Prices in  Active Markets for Identical Assets/Liabilities (Level 1)1	Significant Other Observable Inputs  (Level 2)1	Significant Unobservable Inputs  (Level 3)
Description
Measured on a recurring basis:
AFS fixed income securities:
U.S. government and government agencies	$	121,310	78,381	42,929	—
Foreign government	23,131		—	23,131	—
Obligations of states and political subdivisions	1,138,469		—	1,138,469	—
Corporate securities	1,617,408		—	1,617,408	—
CLO and other ABS	717,362		—	709,953	7,409
CMBS	527,078		—	527,078	—
RMBS	1,128,342		—	1,128,342	—
Total AFS fixed income securities	5,273,100		78,381	5,187,310	7,409
Equity securities:
Common stock2	144,727		107,397	—	—
Preferred stock	2,912		2,912	—	—
Total equity securities	147,639		110,309	—	—
Short-term investments	323,864		321,370	2,494	—
Total assets measured at fair value	$	5,744,603	510,060	5,189,804	7,409

¹  There were no transfers of securities between Level 1 and Level 2.

²  Investments amounting to $33.2 million at September 30, 2019, and $37.3 million at December 31, 2018, were measured at fair value using net asset value per share (or its practical expedient) and have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to total assets measured at fair value.

The following table provides a summary of Level 3 changes in Nine Months 2019:

September 30, 2019
($ in thousands)	Corporate Securities		CLO and Other ABS		Total
Fair value, December 31, 2018	—		7,409		7,409
Total net (losses) gains for the period included in:
OCI	(69	)	(14	)	(83	)
Net income	—		244		244
Purchases	—		18,404		18,404
Sales	—		—		—
Issuances	—		—		—
Settlements	—		(105	)	(105	)
Transfers into Level 3	16,419		13,603		30,022
Transfers out of Level 3	—		(19,662	)	(19,662	)
Fair value, September 30, 2019	16,350		19,879		36,229

There were no material changes in the fair value of securities measured using Level 3 prices in Nine Months 2018.

The following tables provide quantitative information regarding our financial assets and liabilities that were disclosed at fair value at September 30, 2019 and December 31, 2018:

September 30, 2019			Fair Value Measurements Using
($ in thousands)	Assets/ Liabilities Disclosed at Fair Value		Quoted Prices in  Active Markets for  Identical Assets/ Liabilities (Level 1)	Significant Other Observable Inputs (Level 2)	Significant Unobservable Inputs (Level 3)
Financial Assets
HTM:
Obligations of states and political subdivisions	$	9,426	—	9,426	—
Corporate securities	18,930		—	18,930	—
Total HTM fixed income securities	$	28,356	—	28,356	—
Financial Liabilities
Long-term debt:
7.25% Senior Notes	$	65,770	—	65,770	—
6.70% Senior Notes	125,954		—	125,954	—
5.375% Senior Notes	352,156		—	352,156	—
1.61% borrowings from FHLBNY	24,838		—	24,838	—
1.56% borrowings from FHLBNY	24,808		—	24,808	—
3.03% borrowings from FHLBI	63,741		—	63,741	—
Total long-term debt	$	657,267	—	657,267	—

December 31, 2018			Fair Value Measurements Using
($ in thousands)	Assets/ Liabilities Disclosed at Fair Value		Quoted Prices in  Active Markets for  Identical Assets/ Liabilities (Level 1)	Significant Other Observable Inputs (Level 2)	Significant Unobservable Inputs (Level 3)
Financial Assets
HTM:
Obligations of states and political subdivisions	$	17,969	—	17,969	—
Corporate securities	20,348		—	20,348	—
Total HTM fixed income securities	$	38,317	—	38,317	—
Financial Liabilities
Long-term debt:
7.25% Senior Notes	$	57,032	—	57,032	—
6.70% Senior Notes	107,075		—	107,075	—
5.875% Senior Notes	177,230		177,230	—	—
1.61% borrowings from FHLBNY	24,218		—	24,218	—
1.56% borrowings from FHLBNY	24,162		—	24,162	—
3.03% borrowings from FHLBI	58,905		—	58,905	—
Total long-term debt	$	448,622	177,230	271,392	—

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Accounting Pronouncements

9 Months Ended

Sep. 30, 2019

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Accounting Pronouncements

Adoption of Accounting Pronouncements 

The Financial Accounting Standards Board ("FASB") issued new leasing guidance through ASU 2016-02, Leases, which was issued in February 2016, as well as additional implementation guidance that was issued in 2018 and 2019 (collectively referred to as "ASU 2016-02"). ASU 2016-02 requires all lessees to recognize assets and liabilities on their balance sheets for the rights and obligations created by leases with terms longer than 12 months. For leases with a term of 12 months or less, an accounting policy election is allowed to recognize lease expense on a straight-line basis over the lease term.

ASU 2016-02 allows for certain practical expedients, accounting policy elections, and a transition method election. We adopted practical expedients related to reassessing: (i) whether our existing contracts are, or contain, leases; (ii) lease classification for existing leases; and (iii) initial direct costs for existing leases. Additionally, we adopted accounting policy elections to: (i) aggregate lease and non-lease components of a contract into a single lease component; and (ii) expense short-term leases on a straight-line basis over the lease term. We adopted ASU 2016-02 effective January 1, 2019. See Note 12. "Leases" in this Form 10-Q for additional information regarding our leases and the impact of this guidance on our financial condition and results of operations.

In June 2018, the FASB issued ASU 2018-07, Compensation - Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting ("ASU 2018-07"). The amendments in ASU 2018-07 expand the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. We adopted ASU 2018-07 in the first quarter of 2019 and it did not have a material impact on our financial condition or results of operations.

Pronouncements to be effective in the future

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses, as well as additional implementation guidance issued in 2018 and 2019 (collectively referred to as “ASU 2016-13”). ASU 2016-13 will change the way entities recognize impairment of financial assets by requiring immediate recognition of estimated credit losses expected to occur over the remaining life of many financial assets, including, among others, held-to-maturity ("HTM") debt securities, trade receivables, and reinsurance recoverables. ASU 2016-13 requires a valuation allowance to be calculated on financial assets, and that they be presented on the financial statements net of the valuation allowance. The valuation allowance is a measurement of expected losses that is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. This methodology is referred to as the current expected credit loss model. This ASU also made targeted changes to the impairment accounting model for available-for-sale ("AFS") debt securities. ASU 2016-13 is effective for fiscal years beginning after December 15, 2019, including interim periods within those annual periods. We are currently evaluating the impact of this guidance on our financial condition and results of operations.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement: Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement (“ASU 2018-13”). ASU 2018-13 modifies the disclosure requirements for fair value measurements. The modifications removed the following disclosure requirements: (i) the amount of, and reasons for, transfers between Level 1 and Level 2 of the fair value hierarchy; (ii) the policy for timing of transfers between levels; and (iii) the

valuation processes for Level 3 fair value measurements. This ASU added the following disclosure requirements: (i) the changes in unrealized gains and losses for the period included in other comprehensive income ("OCI") for recurring Level 3 fair value measurements held at the end of the reporting period; and (ii) the range and weighted average of significant observable inputs used to develop Level 3 fair value measurements. This update is effective for annual and interim periods beginning after December 15, 2019, with early adoption permitted. As the requirements of this literature are disclosure only, ASU 2018-13 will not impact our financial condition or results of operations.

In August 2018, the FASB issued ASU 2018-14, Compensation - Retirement Benefits - Defined Benefit Plans - General: Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans (“ASU 2018-14”). ASU 2018-14 modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. These modifications include: (i) removing the requirement to disclose the amount in accumulated other comprehensive income ("AOCI") expected to be recognized as components of net periodic benefit cost over the next fiscal year; and (ii) adding the requirement to disclose an explanation of the reasons for significant gains or losses related to changes in the benefit obligation for the period. This update is effective for fiscal years ending after December 15, 2020, with early adoption permitted. As the requirements of this literature are disclosure only, ASU 2018-14 will not impact our financial condition or results of operations.

In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software: Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (“ASU 2018-15”). ASU 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. This update is effective for annual and interim periods beginning after December 15, 2019, with early adoption permitted. We are currently evaluating the impact of this guidance on our financial condition or results of operations.

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Leases (Schedule of Future Minimum Rental Payments Prior Year) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Capital leases, due 2019		$ 728
Capital leases, due 2020		141
Capital leases, due 2021		22
Capital leases, due 2022		0
Capital leases, due 2023		0
Capital leases, due after 2023		0
Total capital lease payments		891
Operating leases, due 2019		7,762
Operating leases, due 2020		7,355
Operating leases, due 2021		5,083
Operating leases, due 2022		3,641
Operating leases, due 2023		2,900
Operating leases, due after 2023		9,698
Total operating lease payments		36,439
Total leases, due 2019	$ 8,615	8,490
Total leases, due 2020	6,281	7,496
Total leases, due 2021	4,497	5,105
Total leases, due 2022	3,232	3,641
Total leases, due 2023		2,900
Total leases, due after 2023	11,446	9,698
Total lease payments	$ 36,313	$ 37,330

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Reserve for Loss and Loss Expense (Rollforward of Reserve for Loss and Loss Expense) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Liability for Claims and Claims Adjustment Expense [Line Items]
Gross reserve for loss and loss expense, at beginning of year	$ 3,893,868	$ 3,771,240
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year	537,388	585,855
Net reserve for loss and loss expense, at beginning of year	3,356,480	3,185,385
Incurred loss and loss expense for claims occurring in the current year	1,200,878	1,148,032
Total incurred loss and loss expense	1,166,238	1,130,468
Paid loss and loss expense for claims occurring in the current year	384,436	369,036
Paid loss and loss expense for claims occurring in the prior years	631,589	610,734
Total paid loss and loss expense	1,016,025	979,770
Net reserve for loss and loss expense, at end of period	3,506,693	3,336,083
Add: reinsurance recoverable on unpaid loss and loss expense, at end of period	548,938	589,072
Gross reserve for loss and loss expense, at end of period	4,055,631	3,925,155
Change in Historical Claim Rate Experience [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year development	(34,640)	(17,564)
Casualty Insurance Product Line [Member] | Change in Historical Claim Rate Experience [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year development	(41,000)	(24,000)
Property Insurance Product Line [Member] | Change in Historical Claim Rate Experience [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year development	6,400	6,400
Workers Compensation [Member] | Casualty Insurance Product Line [Member] | Change in Historical Claim Rate Experience [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year development	(33,000)	(53,000)
General Liability [Member] | Casualty Insurance Product Line [Member] | Change in Historical Claim Rate Experience [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year development	(10,000)	(8,000)
Personal Automobile [Member] | Casualty Insurance Product Line [Member] | Change in Historical Claim Rate Experience [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year development	$ 2,000
Commercial Automobile [Member] | Casualty Insurance Product Line [Member] | Change in Historical Claim Rate Experience [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year development		25,000
Excess And Surplus Operations [Member] | Casualty Insurance Product Line [Member] | Change in Historical Claim Rate Experience [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year development		$ 12,000

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Fair Value Measurements (Change in Fair Value of Securities Using Level 3 Inputs) (Details) - Available-for-sale Securities [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, December 31, 2018	$ 0
Total net (losses) gains for the period included in OCI	(69)
Total net (losses) gains for the period included in net income	0
Purchases	0
Sales	0
Issuances	0
Settlements	0
Transfers into Level 3	16,419
Transfers out of Level 3	0
Fair value, September 30, 2019	16,350
Collateralized Loan Obligations and Other Asset Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, December 31, 2018	7,409
Total net (losses) gains for the period included in OCI	(14)
Total net (losses) gains for the period included in net income	244
Purchases	18,404
Sales	0
Issuances	0
Settlements	(105)
Transfers into Level 3	13,603
Transfers out of Level 3	(19,662)
Fair value, September 30, 2019	19,879
Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, December 31, 2018	7,409
Total net (losses) gains for the period included in OCI	(83)
Total net (losses) gains for the period included in net income	244
Purchases	18,404
Sales	0
Issuances	0
Settlements	(105)
Transfers into Level 3	30,022
Transfers out of Level 3	(19,662)
Fair value, September 30, 2019	$ 36,229

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Indebtedness (Long Term Debt Activity) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Debt Instrument [Line Items]
Net Proceeds from Debt Offering	$ 355,757	$ 130,000
Five Point Three Hundred Seventy Five Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 300,000
Interest Rate	5.375%
Debt Discount	$ 5,900
Unamortized Debt Issuance Expense	3,300
Net Proceeds from Debt Offering	290,800
Proceeds from Debt Issuance, After Redemption	106,000
Five Point Eight Hundred Seventy Five Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 185,000
Interest Rate	5.875%
Debt Retirement Costs, Before Tax	$ 4,200
Debt Retirement Costs, Net of Tax	$ 3,300

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Investments (Credit Concentration Risk) (Details)	Sep. 30, 2019	Dec. 31, 2018
Investments [Abstract]
Maximum exposure to credit concentration risk of the Company's stockholder's equity other than certain U.S. government-backed investments	10.00%	10.00%

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Investments (Realized and Unrealized Gains (Losses) on Equity Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Gain (Loss) on Securities [Line Items]
Unrealized gains recognized in income on equity securities on securities remaining in our portfolio at September 30, 2019	$ 1,109	$ 5,476	$ 1,805	$ 4,199
Unrealized (losses) recognized in income on equity securities on securities sold in each respective period	(21,426)	(8,086)	(9,896)	(19,762)
Total unrealized (losses) recognized in income on equity securities	$ (20,317)	$ (2,610)	$ (8,091)	$ (15,563)

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating Activities
Net income	$ 189,764	$ 133,179
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	42,346	34,961
Stock-based compensation expense	15,857	12,150
Undistributed gains of equity method investments	(8,832)	(4,243)
Distributions in excess of current year income of equity method investments	2,267	3,210
(Gain) loss on disposal of fixed assets	(21)	62
Net realized and unrealized (gains) losses	(15,295)	16,988
Changes in assets and liabilities:
Increase in reserve for loss and loss expense, net of reinsurance recoverable	134,951	144,920
Increase in unearned premiums, net of prepaid reinsurance	122,460	120,535
Decrease in net federal income taxes	2,408	18,339
Increase in premiums receivable	(89,962)	(79,894)
Increase in deferred policy acquisition costs	(26,627)	(22,978)
(Increase) decrease in interest and dividends due or accrued	(1,460)	72
Decrease in accrued salaries and benefits	(16,261)	(36,498)
Increase in other assets	(35,810)	(13,881)
Increase (decrease) in other liabilities	414	(34,437)
Net Cash Provided by Operating Activities	316,199	292,485
Investing Activities
Purchase of fixed income securities, held-to-maturity	0	(7,150)
Purchase of fixed income securities, available-for-sale	(1,330,827)	(1,974,253)
Purchase of equity securities	(40,233)	(57,834)
Purchase of other investments	(41,248)	(47,238)
Purchase of short-term investments	(4,108,414)	(2,711,360)
Sale of fixed income securities, available-for-sale	461,825	1,382,677
Sale of short-term investments	4,106,643	2,572,399
Redemption and maturities of fixed income securities, held-to-maturity	10,062	3,923
Redemption and maturities of fixed income securities, available-for-sale	413,220	456,037
Sale of equity securities	125,302	79,676
Sale of other investments	18,016	3,497
Distributions from other investments	19,054	23,420
Purchase of property and equipment	(24,424)	(11,150)
Fixed asset disposals	35	0
Net Cash (Used in) Investing Activities	(390,989)	(287,356)
Financing Activities
Dividends to stockholders	(34,440)	(30,694)
Acquisition of treasury stock	(8,071)	(6,423)
Net proceeds from stock purchase and compensation plans	5,599	5,001
Proceeds from borrowings	355,757	130,000
Repayments of borrowings	(250,000)	(130,000)
Repayments of finance lease obligations	(811)	(4,891)
Net Cash Provided by (Used in) Financing Activities	68,034	(37,007)
Cash and Restricted Cash, Period Increase (Decrease)	(6,756)	(31,878)
Cash and restricted cash, beginning of year	16,919	44,710
Cash and restricted cash, end of period	$ 10,163	$ 12,832

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Leases (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2019		Jan. 01, 2019	Dec. 31, 2018		Jun. 30, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use asset	$ 28,348		$ 20,700
Operating lease liability	29,218		21,000
Finance lease right-of-use asset	899		900
Finance lease liabilities	904	[1]	900	$ 0	[1]
Retained Earnings [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption	$ 0		$ 300	$ 342		$ 0	$ 0

[1] Concurrent with the adoption of ASU 2016-02 discussed in Note 2. "Adoption of Accounting Pronouncements," finance lease obligations are now captured in Long-term debt on our Consolidated Balance Sheets.

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Retirement Plans (Weighted-Average Expense Assumptions) (Details) - Pension Plan [Member]	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.46%	3.78%
Effective interest rate for calculation of interest cost	4.12%	3.46%
Expected return on plan assets	6.50%	6.36%

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Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Net premiums earned	$ 653,620	$ 614,277	$ 1,928,812	$ 1,810,941
Net investment income earned	55,826	52,443	164,949	141,227
Net realized and unrealized (losses) gains:
Net realized investment gains (losses) on disposals	20,425	(751)	26,752	4,034
Unrealized losses on equity securities	(20,317)	(2,610)	(8,091)	(15,563)
Other-than-temporary impairments	(2,291)	(1,426)	(3,366)	(5,459)
Total net realized and unrealized (losses) gains	(2,183)	(4,787)	15,295	(16,988)
Other income	3,162	2,538	8,535	7,896
Total revenues	710,425	664,471	2,117,591	1,943,076
Expenses:
Loss and loss expense incurred	398,675	379,199	1,166,238	1,130,468
Amortization of deferred policy acquisition costs	136,572	124,511	399,647	368,265
Other insurance expenses	90,234	80,108	261,975	244,342
Interest expense	7,397	6,073	26,289	18,350
Corporate expenses	6,369	7,450	28,345	22,065
Total expenses	639,247	597,341	1,882,494	1,783,490
Income before federal income tax	71,178	67,130	235,097	159,586
Federal income tax expense:
Current	13,805	10,314	44,344	23,529
Deferred	1,223	1,381	989	2,878
Total federal income tax expense	15,028	11,695	45,333	26,407
Net income	$ 56,150	$ 55,435	$ 189,764	$ 133,179
Earnings per share:
Basic net income	$ 0.94	$ 0.94	$ 3.20	$ 2.26
Diluted net income	$ 0.93	$ 0.93	$ 3.16	$ 2.23

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Indebtedness (Tables)

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Schedule of Outstanding Debt

Outstanding Debt	Issuance Date	Maturity Date	Interest Rate		Original Amount		2019	Carry Value
($ in thousands)							Debt Discount and Unamortized Issuance Costs	September 30, 2019	December 31, 2018
Description
Long term
Issuance:
Senior Notes	3/1/2019	3/1/2049	5.375	%	$	300,000	9,065	290,935	—
Redemption:
Senior Notes	2/8/2013	2/9/2043	5.875	%	185,000		—	—	180,771
Other Outstanding:
FHLBI	12/16/2016	12/16/2026	3.03	%	60,000		—	60,000	60,000
FHLBNY	8/15/2016	8/16/2021	1.56	%	25,000		—	25,000	25,000
FHLBNY	7/21/2016	7/21/2021	1.61	%	25,000		—	25,000	25,000
Senior Notes	11/3/2005	11/1/2035	6.70	%	100,000		889	99,111	99,069
Senior Notes	11/16/2004	11/15/2034	7.25	%	50,000		281	49,719	49,700
Finance lease obligations1								904	—
Total long-term debt							10,235	550,669	439,540

¹ Concurrent with the adoption of ASU 2016-02 discussed in Note 2. "Adoption of Accounting Pronouncements," finance lease obligations are now captured in Long-term debt on our Consolidated Balance Sheets.

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Leases

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Leases

Leases

We have various operating leases for office space, equipment, and fleet vehicles. In addition, we have various finance leases for computer hardware. Such lease agreements, which expire at various dates through 2030, are generally renewed or replaced by similar leases.

We determine if an arrangement is a lease on the commencement date of the contract. Lease assets represent our right to use an underlying asset for the lease term, and lease liabilities represent our obligation to make lease payments arising from the lease. The lease asset and liability are measured by the present value of the future minimum lease payments over the lease term. Our fleet vehicle leases include a residual value guarantee; however, it is not probable of being owed. Therefore, there is no impact to the lease liability or lease asset. To measure the present value, the discount rate available in the contract is used. If the discount rate is not readily determinable, our incremental borrowing rate is used. The lease asset is then adjusted to exclude lease incentives. We recognize variable lease payments in the period in which the obligation for those payments is incurred. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Lease expense is calculated using the straight-line method.

Upon adoption of ASU 2016-02 on January 1, 2019, we recorded operating lease right-of-use assets of $20.7 million with related lease liabilities of $21.0 million. The differential of $0.3 million was recognized, on an after-tax basis, as a cumulative-effect adjustment to the opening balance of retained earnings as of January 1, 2019. Financing lease right-of-use assets and the related lease liabilities were $0.9 million as of January 1, 2019. See Note 2. "Adoption of Accounting Pronouncements" in this Form 10-Q for additional information regarding ASU 2016-02 and accounting policy elections made.

The components of lease expense in Third Quarter and Nine Months 2019 were as follows:

($ in thousands)	Quarter ended September 30, 2019			Nine Months ended September 30, 2019
Operating lease cost, included in Other insurance expenses on the Consolidated Statements of Income	$	2,234		6,631
Finance lease cost:
Amortization of assets, included in Other insurance expenses on the Consolidated Statements of Income	217			816
Interest on lease liabilities, included in Interest expense on the Consolidated Statements of Income	5			12
Total finance lease cost	222			828
Variable lease cost, included in Other insurance expenses on the Consolidated Statements of Income	(548		)	120
Short-term lease cost, included in Other insurance expenses on the Consolidated Statements of Income	502			1,677

The following table provides supplemental information regarding our operating and finance leases.

	September 30, 2019
Weighted-average remaining lease term
Operating leases	6	years
Finance leases	2
Weighted-average discount rate
Operating leases	3.4	%
Finance leases1	2.0

¹Prior to adoption of ASU 2016-02, our historical capital lease liability and asset were measured using an un-discounted cash flow stream due to immateriality of the capital lease population.

Operating and finance lease asset and liability balances are included within the following line items on the Consolidated Balance Sheets:

($ in thousands)	September 30, 2019
Operating leases
Other assets	$	28,348
Other liabilities	29,218
Finance leases
Property and equipment - at cost, net of accumulated depreciation and amortization	899
Long-term debt	904

At September 30, 2019, the maturities of our lease liabilities were as follows:

($ in thousands)	Finance Leases		Operating Leases	Total
Year ended December 31,
2019 (excluding the nine months ended September 30, 2019)	$	171	2,071	2,242
2020	451		8,164	8,615
2021	248		6,033	6,281
2022	54		4,443	4,497
2023	—		3,232	3,232
Thereafter	—		11,446	11,446
Total lease payments	924		35,389	36,313
Less: imputed interest	20		3,230	3,250
Less: leases that have not yet commenced	—		2,941	2,941
Total lease liabilities	$	904	29,218	30,122

At December 31, 2018, the maturities of our lease liabilities for capital and operating leases were as follows:

($ in thousands)	Capital Leases		Operating Leases	Total
2019	$	728	7,762	8,490
2020	141		7,355	7,496
2021	22		5,083	5,105
2022	—		3,641	3,641
2023	—		2,900	2,900
Thereafter	—		9,698	9,698
Total minimum payment required	$	891	36,439	37,330

Refer to Note. 3 "Statements of Cash Flows" in this Form 10-Q for supplemental cash and non-cash transactions included in the measurement of operating and finance lease liabilities.

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Schedule of Revenue By Segment

Revenue by Segment	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019	2018
Standard Commercial Lines:
Net premiums earned:
Commercial automobile	$	141,182		124,862		408,706	365,197
Workers compensation	75,478			78,784		232,657	237,628
General liability	169,084			154,974		495,402	457,805
Commercial property	89,215			83,056		262,418	245,544
Businessowners’ policies	26,371			25,994		78,624	77,414
Bonds	8,990			8,778		26,861	25,247
Other	4,841			4,608		14,326	13,597
Miscellaneous income	2,782			2,228		7,544	6,936
Total Standard Commercial Lines revenue	517,943			483,284		1,526,538	1,429,368
Standard Personal Lines:
Net premiums earned:
Personal automobile	43,226			42,772		129,777	125,024
Homeowners	31,529			32,293		95,672	96,717
Other	1,983			2,092		5,709	5,349
Miscellaneous income	380			310		991	959
Total Standard Personal Lines revenue	77,118			77,467		232,149	228,049
E&S Lines:
Net premiums earned:
Casualty lines	47,171			42,179		136,455	120,098
Property lines	14,550			13,885		42,205	41,321
Miscellaneous income	—			—		—	1
Total E&S Lines revenue	61,721			56,064		178,660	161,420
Investments:
Net investment income	55,826			52,443		164,949	141,227
Net realized and unrealized investment (losses) gains	(2,183		)	(4,787	)	15,295	(16,988	)
Total Investments revenue	53,643			47,656		180,244	124,239
Total revenues	$	710,425		664,471		2,117,591	1,943,076

Schedule of Income Before and After Federal Income Tax

Income Before and After Federal Income Tax	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019	2018
Standard Commercial Lines:
Underwriting gain, before federal income tax	$	30,016		26,333		92,974	74,153
Underwriting gain, after federal income tax	23,713			20,803		73,450	58,581
Combined ratio	94.2		%	94.5		93.9	94.8
ROE contribution	4.5			4.9		5.0	4.5
Standard Personal Lines:
Underwriting (loss) gain, before federal income tax	$	(631	)	3,158		7,074	6,457
Underwriting (loss) gain, after federal income tax	(499		)	2,495		5,588	5,101
Combined ratio	100.8		%	95.9		96.9	97.2
ROE contribution	(0.1		)	0.6		0.4	0.4
E&S Lines:
Underwriting gain (loss), before federal income tax	$	1,916		3,506		9,439	(4,848	)
Underwriting gain (loss), after federal income tax	1,514			2,770		7,457	(3,830	)
Combined ratio	96.9		%	93.7		94.7	103.0
ROE contribution	0.3			0.6		0.5	(0.3	)
Investments:
Net investment income	$	55,826		52,443		164,949	141,227
Net realized and unrealized investment (losses) gains	(2,183		)	(4,787	)	15,295	(16,988	)
Total investment segment income, before federal income tax	53,643			47,656		180,244	124,239
Tax on investment segment income	10,884			8,562		34,733	21,405
Total investment segment income, after federal income tax	$	42,759		39,094		145,511	102,834
ROE contribution of after-tax net investment income	8.6			10.0		9.1	9.0

Schedule of Reconciliation of Segment Results to Income Before Federal Income Tax

Reconciliation of Segment Results to Income Before Federal Income Tax	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019		2018
Underwriting gain (loss)
Standard Commercial Lines	$	30,016		26,333		92,974		74,153
Standard Personal Lines	(631		)	3,158		7,074		6,457
E&S Lines	1,916			3,506		9,439		(4,848	)
Investment income	53,643			47,656		180,244		124,239
Total all segments	84,944			80,653		289,731		200,001
Interest expense	(7,397		)	(6,073	)	(26,289	)	(18,350	)
Corporate expenses	(6,369		)	(7,450	)	(28,345	)	(22,065	)
Income, before federal income tax	$	71,178		67,130		235,097		159,586

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Reserve for Loss and Loss Expense

9 Months Ended

Sep. 30, 2019

Insurance Loss Reserves [Abstract]

Reserve for Loss and Loss Expense

Reserve for Loss and Loss Expense

The table below provides a roll forward of reserve for loss and loss expense balances:

	Nine Months ended September 30,
($ in thousands)	2019			2018
Gross reserve for loss and loss expense, at beginning of year	$	3,893,868		3,771,240
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year	537,388			585,855
Net reserve for loss and loss expense, at beginning of year	3,356,480			3,185,385
Incurred loss and loss expense for claims occurring in the:
Current year	1,200,878			1,148,032
Prior years	(34,640		)	(17,564	)
Total incurred loss and loss expense	1,166,238			1,130,468
Paid loss and loss expense for claims occurring in the:
Current year	384,436			369,036
Prior years	631,589			610,734
Total paid loss and loss expense	1,016,025			979,770
Net reserve for loss and loss expense, at end of period	3,506,693			3,336,083
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period	548,938			589,072
Gross reserve for loss and loss expense at end of period	$	4,055,631		3,925,155

Prior year reserve development in Nine Months 2019 of $34.6 million included $41.0 million of favorable casualty reserve development, partially offset by $6.4 million of unfavorable property reserve development. The favorable casualty reserve development included $33.0 million in our workers compensation line of business and $10.0 million in our general liability line

of business, partially offset by $2.0 million of unfavorable casualty reserve development in our personal automobile line of business.

Prior year reserve development in Nine Months 2018 of $17.6 million included $24.0 million of favorable casualty reserve development, partially offset by $6.4 million of unfavorable property reserve development. The favorable casualty reserve development included $53.0 million of development in our workers compensation line of business and $8.0 million in our general liability line of business, partially offset by $25.0 million of unfavorable casualty reserve development in our commercial automobile line of business and $12.0 million in our excess and surplus ("E&S") casualty lines.

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Investments

9 Months Ended

Sep. 30, 2019

Investments [Abstract]

Investments

Investments

(a) Our HTM fixed income securities as of September 30, 2019 represented less than 1% of our total invested assets, down slightly compared to December 31, 2018. The carry value and net unrealized/unrecognized gains were $26.9 million and $1.5 million, respectively, at September 30, 2019, and $37.1 million and $1.3 million, respectively, at December 31, 2018. Included in the net unrealized/unrecognized gains were gross unrealized/unrecognized losses of less than $0.1 million at September 30, 2019 and $0.2 million at December 31, 2018.

Unrecognized holding gains and losses of HTM securities are not reflected in the Financial Statements, as they represent fair value fluctuations from the date a security is designated as HTM through the date of the balance sheet.

(b) Information regarding our AFS securities as of September 30, 2019 and December 31, 2018 was as follows:

September 30, 2019
($ in thousands)	Cost/ Amortized Cost		Unrealized Gains	Unrealized Losses		Fair Value
AFS fixed income securities:
U.S. government and government agencies	$	116,555	4,357	(12	)	120,900
Foreign government	20,947		573	—		21,520
Obligations of states and political subdivisions	1,127,709		62,910	(4	)	1,190,615
Corporate securities	1,762,981		78,345	(2,399	)	1,838,927
Collateralized loan obligations and other asset-backed securities ("CLO and other ABS")	764,038		8,998	(4,653	)	768,383
Commercial mortgage-backed securities ("CMBS")	524,441		31,435	(145	)	555,731
Residential mortgage-backed securities (“RMBS”)	1,389,985		44,710	(534	)	1,434,161
Total AFS fixed income securities	$	5,706,656	231,328	(7,747	)	5,930,237

December 31, 2018
($ in thousands)	Cost/ Amortized Cost		Unrealized Gains	Unrealized Losses		Fair Value
AFS fixed income securities:
U.S. government and government agencies	$	120,092	1,810	(592	)	121,310
Foreign government	23,202		36	(107	)	23,131
Obligations of states and political subdivisions	1,121,615		19,485	(2,631	)	1,138,469
Corporate securities	1,639,852		5,521	(27,965	)	1,617,408
CLO and other ABS	720,193		4,112	(6,943	)	717,362
CMBS	527,409		3,417	(3,748	)	527,078
RMBS	1,118,435		12,988	(3,081	)	1,128,342
Total AFS fixed income securities	$	5,270,798	47,369	(45,067	)	5,273,100

Unrealized gains and losses of AFS securities represent fair value fluctuations from the later of: (i) the date a security is designated as AFS; or (ii) the date that an other-than-temporary impairment ("OTTI") charge is recognized on an AFS security, through the date of the balance sheet. These unrealized gains and losses are recorded in AOCI on the Consolidated Balance Sheets.

(c) The severity of impairment on AFS securities in an unrealized/unrecognized loss position averaged approximately 1% of amortized cost at September 30, 2019 and approximately 2% at December 31, 2018. Quantitative information regarding these losses is provided below.

September 30, 2019	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	$	5,014	(11	)	498	(1	)	5,512	(12	)
Obligations of states and political subdivisions	437		(4	)	—	—		437	(4	)
Corporate securities	89,919		(1,862	)	15,867	(537	)	105,786	(2,399	)
CLO and other ABS	176,999		(2,458	)	180,898	(2,195	)	357,897	(4,653	)
CMBS	59,857		(126	)	7,665	(19	)	67,522	(145	)
RMBS	84,408		(503	)	9,513	(31	)	93,921	(534	)
Total AFS fixed income securities	$	416,634	(4,964	)	214,441	(2,783	)	631,075	(7,747	)

December 31, 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	$	6,693	(174	)	23,163	(418	)	29,856	(592	)
Foreign government	12,208		(93	)	1,482	(14	)	13,690	(107	)
Obligations of states and political subdivisions	196,798		(2,074	)	42,821	(557	)	239,619	(2,631	)
Corporate securities	1,041,952		(23,649	)	78,953	(4,316	)	1,120,905	(27,965	)
CLO and other ABS	516,106		(6,750	)	16,800	(193	)	532,906	(6,943	)
CMBS	229,338		(2,548	)	66,294	(1,200	)	295,632	(3,748	)
RMBS	139,338		(1,660	)	45,661	(1,421	)	184,999	(3,081	)
Total AFS fixed income securities	$	2,142,433	(36,948	)	275,174	(8,119	)	2,417,607	(45,067	)

  ¹ Gross unrealized losses include non-OTTI unrealized amounts and OTTI losses recognized in AOCI. 

The $37.3 million decrease in the unrealized loss position reflected: (i) lower interest rates, with an 87-basis point decrease in 2-year U.S. Treasury Note yields and a 102-basis point decrease in 10-year U.S. Treasury Note yields during Nine Months 2019; and (ii) tightening option adjusted corporate credit spreads, with a 38-basis point decrease in the Bloomberg Barclays U.S. Aggregate Corporate Bond Index during Nine Months 2019. We do not currently intend to sell any of the securities in the tables above, nor will we be required to sell any of these securities. Considering these factors, and in accordance with our review of these securities under our OTTI policy, as described in Note 2. “Summary of Significant Accounting Policies” within Item 8. “Financial Statements and Supplementary Data.” of our 2018 Annual Report, we have concluded that they are temporarily impaired as we believe: (i) they will mature at par value; (ii) they have not incurred a credit impairment; and (iii) future values of these securities will fluctuate with changes in interest rates. This conclusion reflects our current judgment as to the financial position and future prospects of the entity that issued the investment security and underlying collateral.

(d) Fixed income securities at September 30, 2019, by contractual maturity, are shown below. Mortgage-backed securities are included in the maturity tables using the estimated average life of each security. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations, with or without call or prepayment penalties.

Listed below are the contractual maturities of fixed income securities at September 30, 2019:

	AFS		HTM
($ in thousands)	Fair Value		Carrying Value	Fair Value
Due in one year or less	$	310,387	4,754	4,773
Due after one year through five years	3,296,126		16,334	17,589
Due after five years through 10 years	2,191,633		5,837	5,994
Due after 10 years	132,091		—	—
Total fixed income securities	$	5,930,237	26,925	28,356

(e) The following table summarizes our other investment portfolio by strategy:

Other Investments	September 30, 2019				December 31, 2018
($ in thousands)	Carrying Value		Remaining Commitment	Maximum Exposure to Loss1	Carrying Value	Remaining Commitment	Maximum Exposure to Loss1
Alternative Investments
Private equity	$	105,922	97,552	203,474	84,352	93,688	178,040
Private credit	37,710		109,797	147,507	41,682	81,453	123,135
Real assets	21,828		22,534	44,362	27,862	27,129	54,991
Total alternative investments	165,460		229,883	395,343	153,896	202,270	356,166
Other securities	23,783		—	23,783	25,042	—	25,042
Total other investments	$	189,243	229,883	419,126	178,938	202,270	381,208

¹The maximum exposure to loss includes both the carry value of these investments and the related remaining 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. 

We are contractually committed to make additional investments up to the remaining commitments outlined above; however, we do not have a future obligation to fund losses or debts on behalf of these investments. We have not provided any non-contractual financial support at any time during 2019 or 2018.

The following table sets forth gross summarized financial information for our other investments portfolio, including the portion not owned by us. The majority of these investments are carried under the equity method of accounting. The last line of the table below reflects our share of the aggregate income or loss, which is the portion included in our Financial Statements. As the majority of these investments report results to us on a one quarter lag, the summarized financial statement information for the three-month period ended June 30 is included in our Third Quarter results. This information is as follows:

Income Statement Information	Quarter ended September 30,				Nine Months ended September 30,
($ in millions)	2019			2018	2019	2018
Net investment (loss) income	$	(14.0	)	11.9	10.1	(29.9	)
Realized gains	121.1			124.8	370.4	1,348.3
Net change in unrealized appreciation (depreciation)	1,739.4			1,434.3	4,517.4	695.8
Net income	$	1,846.5		1,571.0	4,897.9	2,014.2
Insurance subsidiaries’ alternative investments income	$	5.2		7.1	13.0	10.6

(f) We have pledged certain AFS fixed income securities as collateral related to our relationships with the Federal Home Loan Bank of Indianapolis ("FHLBI") and the Federal Home Loan Bank of New York ("FHLBNY"). In addition, certain securities were on deposit with various state and regulatory agencies at September 30, 2019 to comply with insurance laws. We retain all rights regarding all securities pledged as collateral.

The following table summarizes the market value of these securities at September 30, 2019:

($ in millions)	FHLBI Collateral		FHLBNY Collateral	State and Regulatory Deposits	Total
U.S. government and government agencies	$	—	—	22.9	22.9
Obligations of states and political subdivisions	—		—	3.9	3.9
Corporate securities	—		—	0.3	0.3
CMBS	7.3		19.6	—	26.9
RMBS	57.4		81.1	—	138.5
Total pledged as collateral	$	64.7	100.7	27.1	192.5

(g) We did not have exposure to any credit concentration risk of a single issuer greater than 10% of our stockholders' equity, other than certain U.S. government-backed investments, as of September 30, 2019 or December 31, 2018.

(h) The components of pre-tax net investment income earned were as follows:

	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019		2018
Fixed income securities	$	50,749		45,088		150,689		130,903
Equity securities	1,885			2,079		5,265		5,876
Short-term investments	1,410			867		5,213		2,001
Other investments	5,267			7,211		13,421		10,868
Investment expenses	(3,485		)	(2,802	)	(9,639	)	(8,421	)
Net investment income earned	$	55,826		52,443		164,949		141,227

(i) OTTI charges were $2.3 million and $1.4 million in Third Quarter 2019 and Third Quarter 2018, respectively, and $3.4 million and $5.5 million in Nine Months 2019 and Nine Months 2018, respectively. All of these charges were related to securities for which we had the intent to sell. For a discussion of our evaluation for OTTI, refer to Note 2. "Summary of Significant Accounting Policies" in Item 8. "Financial Statements and Supplementary Data." of our 2018 Annual Report.

(j) Net realized and unrealized gains and losses (excluding OTTI charges) for Third Quarter 2019 and 2018 included the following:

	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019			2018
Net realized gains (losses) on the disposals of securities:
Fixed income securities	$	(1,141	)	(9,413	)	2,063			(13,922	)
Equity securities	21,602			8,665		24,733			17,960
Short-term investments	(36		)	2		(21		)	1
Other investments	—			(5	)	(23		)	(5	)
Net realized gains (losses) on the disposal of securities	20,425			(751	)	26,752			4,034
OTTI charges	(2,291		)	(1,426	)	(3,366		)	(5,459	)
Net realized gains (losses)	18,134			(2,177	)	23,386			(1,425	)
Unrealized (losses) recognized in income on equity securities	(20,317		)	(2,610	)	(8,091		)	(15,563	)
Total net realized and unrealized investment (losses) gains	$	(2,183	)	(4,787	)	$	15,295		(16,988	)

Unrealized (losses) recognized in income on equity securities, as reflected in the table above, include the following:

	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019			2018
Unrealized gains (losses) recognized in income on equity securities:
On securities remaining in our portfolio at September 30, 2019	$	1,109		5,476		1,805			4,199
On securities sold in each respective period	(21,426		)	(8,086	)	(9,896		)	(19,762	)
Total unrealized (losses) recognized in income on equity securities	$	(20,317	)	(2,610	)	$	(8,091	)	(15,563	)

The components of net realized gains on disposals of securities for the periods indicated were as follows:

	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019		2018
HTM fixed income securities
Gains	$	—		—		1		2
Losses	—			—		(15	)	—
AFS fixed income securities
Gains	1,078			462		5,565		5,056
Losses	(2,219		)	(9,875	)	(3,488	)	(18,980	)
Equity securities
Gains	21,630			10,584		24,868		20,209
Losses	(28		)	(1,919	)	(135	)	(2,249	)
Short-term investments
Gains	2			3		18		6
Losses	(38		)	(1	)	(39	)	(5	)
Other investments
Gains	—			—		7		—
Losses	—			(5	)	(30	)	(5	)
Total net realized gains on disposals of securities	$	20,425		(751	)	26,752		4,034

Realized gains and losses on the sale of investments are determined on the basis of the cost of the specific investments sold.

Proceeds from the sales of AFS fixed income securities were $89.7 million and $444.4 million in Third Quarter 2019 and Third Quarter 2018, respectively, and $461.8 million and $1,382.7 million in Nine Months 2019 and Nine Months 2018, respectively. Proceeds from the sales of equity securities were $95.2 million and $36.1 million in Third Quarter 2019 and Third Quarter 2018, respectively, and $125.3 million and $79.7 million in Nine Months 2019 and Nine Months 2018, respectively.

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Investments (Aggregated Income Statement Summarized Financial Information for Partnerhips in our Alternative Investment Portfolio) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]
Net investment income earned	$ 55,826	$ 52,443	$ 164,949	$ 141,227
Alternative Investments [Member]
Schedule of Equity Method Investments [Line Items]
Net investment income earned	5,200	7,100	13,000	10,600
Investments accounted for under the equity method [Member]
Schedule of Equity Method Investments [Line Items]
Net investment (loss) income	(14,000)	11,900	10,100	(29,900)
Realized gains	121,100	124,800	370,400	1,348,300
Net change in unrealized appreciation (depreciation)	1,739,400	1,434,300	4,517,400	695,800
Net income	$ 1,846,500	$ 1,571,000	$ 4,897,900	$ 2,014,200

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Leases (Tables)

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Components of Lease Expense

($ in thousands)	Quarter ended September 30, 2019			Nine Months ended September 30, 2019
Operating lease cost, included in Other insurance expenses on the Consolidated Statements of Income	$	2,234		6,631
Finance lease cost:
Amortization of assets, included in Other insurance expenses on the Consolidated Statements of Income	217			816
Interest on lease liabilities, included in Interest expense on the Consolidated Statements of Income	5			12
Total finance lease cost	222			828
Variable lease cost, included in Other insurance expenses on the Consolidated Statements of Income	(548		)	120
Short-term lease cost, included in Other insurance expenses on the Consolidated Statements of Income	502			1,677

Supplemental Lease Information

	September 30, 2019
Weighted-average remaining lease term
Operating leases	6	years
Finance leases	2
Weighted-average discount rate
Operating leases	3.4	%
Finance leases1	2.0

¹Prior to adoption of ASU 2016-02, our historical capital lease liability and asset were measured using an un-discounted cash flow stream due to immateriality of the capital lease population.

Lease Assets and Liabilities

($ in thousands)	September 30, 2019
Operating leases
Other assets	$	28,348
Other liabilities	29,218
Finance leases
Property and equipment - at cost, net of accumulated depreciation and amortization	899
Long-term debt	904

Maturities of Lease Liabilities

($ in thousands)	Finance Leases		Operating Leases	Total
Year ended December 31,
2019 (excluding the nine months ended September 30, 2019)	$	171	2,071	2,242
2020	451		8,164	8,615
2021	248		6,033	6,281
2022	54		4,443	4,497
2023	—		3,232	3,232
Thereafter	—		11,446	11,446
Total lease payments	924		35,389	36,313
Less: imputed interest	20		3,230	3,250
Less: leases that have not yet commenced	—		2,941	2,941
Total lease liabilities	$	904	29,218	30,122

Schedule of Future Minimum Rental Commitments For Non-Cancelable Leases

($ in thousands)	Capital Leases		Operating Leases	Total
2019	$	728	7,762	8,490
2020	141		7,355	7,496
2021	22		5,083	5,105
2022	—		3,641	3,641
2023	—		2,900	2,900
Thereafter	—		9,698	9,698
Total minimum payment required	$	891	36,439	37,330

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Investments (Available-For-Sale Securities Disclosure) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Cost/Amortized Cost	$ 5,706,656	$ 5,270,798
Unrealized Gains	231,328	47,369
Unrealized Losses	(7,747)	(45,067)
Debt Securities, Available-for-sale	5,930,237	5,273,100
AFS Fixed Income Securities [Member] | U.S. Government and Government Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Cost/Amortized Cost	116,555	120,092
Unrealized Gains	4,357	1,810
Unrealized Losses	(12)	(592)
Debt Securities, Available-for-sale	120,900	121,310
AFS Fixed Income Securities [Member] | Foreign Government [Member]
Debt Securities, Available-for-sale [Line Items]
Cost/Amortized Cost	20,947	23,202
Unrealized Gains	573	36
Unrealized Losses	0	(107)
Debt Securities, Available-for-sale	21,520	23,131
AFS Fixed Income Securities [Member] | Obligations of States and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Cost/Amortized Cost	1,127,709	1,121,615
Unrealized Gains	62,910	19,485
Unrealized Losses	(4)	(2,631)
Debt Securities, Available-for-sale	1,190,615	1,138,469
AFS Fixed Income Securities [Member] | Corporate Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Cost/Amortized Cost	1,762,981	1,639,852
Unrealized Gains	78,345	5,521
Unrealized Losses	(2,399)	(27,965)
Debt Securities, Available-for-sale	1,838,927	1,617,408
AFS Fixed Income Securities [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Cost/Amortized Cost	764,038	720,193
Unrealized Gains	8,998	4,112
Unrealized Losses	(4,653)	(6,943)
Debt Securities, Available-for-sale	768,383	717,362
AFS Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Cost/Amortized Cost	524,441	527,409
Unrealized Gains	31,435	3,417
Unrealized Losses	(145)	(3,748)
Debt Securities, Available-for-sale	555,731	527,078
AFS Fixed Income Securities [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Cost/Amortized Cost	1,389,985	1,118,435
Unrealized Gains	44,710	12,988
Unrealized Losses	(534)	(3,081)
Debt Securities, Available-for-sale	$ 1,434,161	$ 1,128,342

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Reinsurance (List of Direct, Assumed, and Ceded Reinsurance Amounts) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Premiums written:
Direct	$ 785,680	$ 752,834	$ 2,359,441	$ 2,220,431
Assumed	6,882	7,084	18,770	19,891
Ceded	(115,634)	(108,250)	(326,939)	(308,846)
Net	676,928	651,668	2,051,272	1,931,476
Premiums earned:
Direct	752,872	706,497	2,221,257	2,086,953
Assumed	6,356	6,484	18,660	19,220
Ceded	(105,608)	(98,704)	(311,105)	(295,232)
Net	653,620	614,277	1,928,812	1,810,941
Loss and loss expenses incurred:
Direct	437,618	477,427	1,297,975	1,289,357
Assumed	4,362	6,529	13,975	16,897
Ceded	(43,305)	(104,757)	(145,712)	(175,786)
Net	$ 398,675	$ 379,199	1,166,238	$ 1,130,468
Fire [Member]
Loss and loss expenses incurred:
Ceded			$ (17,400)

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Fair Value Measurements (Carrying Values and Estimated Fair Values of Financial Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2019		Jan. 01, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Finance lease liabilities	$ 904	[1]	$ 900	$ 0	[1]
Long-term Debt	550,669
Long-term Debt				439,540
Long-term debt, fair value	657,267			448,622
Seven Point Twenty Five Percent Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	49,719
Long-term Debt				49,700
Long-term debt, fair value	65,770			57,032
Seven Point Twenty Five Percent Senior Notes [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	49,909			49,907
Six Point Seventy Percent Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	99,111
Long-term Debt				99,069
Long-term debt, fair value	125,954			107,075
Six Point Seventy Percent Senior Notes [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	99,476			99,462
Five Point Eight Hundred Seventy Five Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	0
Long-term Debt				180,771
Long-term debt, fair value	0			177,230
Five Point Eight Hundred Seventy Five Senior Notes [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	0			185,000
Five Point Three Hundred Seventy Five Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	290,935
Long-term Debt				0
Long-term debt, fair value	352,156			0
Five Point Three Hundred Seventy Five Senior Notes [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	294,136			0
One Point Sixty One Percent Borrowing From Federal Home Loan Bank Due July 21, 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	25,000
Long-term Debt				25,000
Long-term debt, fair value	24,838			24,218
One Point Sixty One Percent Borrowing From Federal Home Loan Bank Due July 21, 2021 [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	25,000			25,000
One Point Fifty Six Percent Borrowing From Federal Home Loan Bank Due August 16, 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	25,000
Long-term Debt				25,000
Long-term debt, fair value	24,808			24,162
One Point Fifty Six Percent Borrowing From Federal Home Loan Bank Due August 16, 2021 [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	25,000			25,000
Three Point Zero Three Percent Borrowing From Federal Home Loan Bank Due December 16, 2026 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	60,000
Long-term Debt				60,000
Long-term debt, fair value	63,741			58,905
Three Point Zero Three Percent Borrowing From Federal Home Loan Bank Due December 16, 2026 [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	60,000			60,000
Long Term Debt Excluding Issuance Costs and Finance Lease Obligations [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	553,521			444,369
Unamortized Debt Issuance Costs [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized debt issuance costs	$ (3,756)			$ (4,829)

[1] Concurrent with the adoption of ASU 2016-02 discussed in Note 2. "Adoption of Accounting Pronouncements," finance lease obligations are now captured in Long-term debt on our Consolidated Balance Sheets.

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Segment Information (Revenue by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Total net premiums earned	$ 653,620	$ 614,277	$ 1,928,812	$ 1,810,941
Miscellaneous income	3,162	2,538	8,535	7,896
Net investment income	55,826	52,443	164,949	141,227
Net realized and unrealized investment (losses) gains	(2,183)	(4,787)	15,295	(16,988)
Total investment revenues	53,643	47,656	180,244	124,239
Total revenues	710,425	664,471	2,117,591	1,943,076
Standard Commercial Lines [Member]
Segment Reporting Information [Line Items]
Miscellaneous income	2,782	2,228	7,544	6,936
Total revenues	517,943	483,284	1,526,538	1,429,368
Standard Commercial Lines [Member] | Commercial Automobile [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	141,182	124,862	408,706	365,197
Standard Commercial Lines [Member] | Workers Compensation [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	75,478	78,784	232,657	237,628
Standard Commercial Lines [Member] | General Liability [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	169,084	154,974	495,402	457,805
Standard Commercial Lines [Member] | Commercial Property [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	89,215	83,056	262,418	245,544
Standard Commercial Lines [Member] | Business Owners' Policies [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	26,371	25,994	78,624	77,414
Standard Commercial Lines [Member] | Bonds Segment [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	8,990	8,778	26,861	25,247
Standard Commercial Lines [Member] | Other Commercial [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	4,841	4,608	14,326	13,597
Standard Personal Lines [Member]
Segment Reporting Information [Line Items]
Miscellaneous income	380	310	991	959
Total revenues	77,118	77,467	232,149	228,049
Standard Personal Lines [Member] | Personal Automobile [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	43,226	42,772	129,777	125,024
Standard Personal Lines [Member] | Homeowners [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	31,529	32,293	95,672	96,717
Standard Personal Lines [Member] | Other Personal [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	1,983	2,092	5,709	5,349
Excess And Surplus Operations [Member]
Segment Reporting Information [Line Items]
Miscellaneous income	0	0	0	1
Total revenues	61,721	56,064	178,660	161,420
Excess And Surplus Operations [Member] | Casualty Insurance Product Line [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	47,171	42,179	136,455	120,098
Excess And Surplus Operations [Member] | Property Insurance Product Line [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	$ 14,550	$ 13,885	$ 42,205	$ 41,321

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Segment Information

9 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Segment Information

Segment Information

The results of our four reportable segments are evaluated as follows:

• Our Standard Commercial Lines, Standard Personal Lines, and E&S Lines are evaluated based on before and after-tax underwriting results (net premiums earned, incurred loss and loss expense, policyholder dividends, policy acquisition costs, and other underwriting expenses), return on equity ("ROE") contribution, and combined ratios.

• Our Investments segment is primarily evaluated based on after-tax net investment income and its ROE contribution. Also included in Investment segment results are after-tax net realized and unrealized gains and losses, which are not included in non-GAAP operating income.

In computing the results of each segment, we do not make adjustments for interest expense or corporate expenses. We do not maintain separate investment portfolios for the segments and therefore, do not allocate assets to the segments.

The following summaries present revenues (net investment income and net realized and unrealized gains on investments in the case of the Investments segment) and pre-tax income for the individual segments:

Revenue by Segment	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019	2018
Standard Commercial Lines:
Net premiums earned:
Commercial automobile	$	141,182		124,862		408,706	365,197
Workers compensation	75,478			78,784		232,657	237,628
General liability	169,084			154,974		495,402	457,805
Commercial property	89,215			83,056		262,418	245,544
Businessowners’ policies	26,371			25,994		78,624	77,414
Bonds	8,990			8,778		26,861	25,247
Other	4,841			4,608		14,326	13,597
Miscellaneous income	2,782			2,228		7,544	6,936
Total Standard Commercial Lines revenue	517,943			483,284		1,526,538	1,429,368
Standard Personal Lines:
Net premiums earned:
Personal automobile	43,226			42,772		129,777	125,024
Homeowners	31,529			32,293		95,672	96,717
Other	1,983			2,092		5,709	5,349
Miscellaneous income	380			310		991	959
Total Standard Personal Lines revenue	77,118			77,467		232,149	228,049
E&S Lines:
Net premiums earned:
Casualty lines	47,171			42,179		136,455	120,098
Property lines	14,550			13,885		42,205	41,321
Miscellaneous income	—			—		—	1
Total E&S Lines revenue	61,721			56,064		178,660	161,420
Investments:
Net investment income	55,826			52,443		164,949	141,227
Net realized and unrealized investment (losses) gains	(2,183		)	(4,787	)	15,295	(16,988	)
Total Investments revenue	53,643			47,656		180,244	124,239
Total revenues	$	710,425		664,471		2,117,591	1,943,076

Income Before and After Federal Income Tax	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019	2018
Standard Commercial Lines:
Underwriting gain, before federal income tax	$	30,016		26,333		92,974	74,153
Underwriting gain, after federal income tax	23,713			20,803		73,450	58,581
Combined ratio	94.2		%	94.5		93.9	94.8
ROE contribution	4.5			4.9		5.0	4.5
Standard Personal Lines:
Underwriting (loss) gain, before federal income tax	$	(631	)	3,158		7,074	6,457
Underwriting (loss) gain, after federal income tax	(499		)	2,495		5,588	5,101
Combined ratio	100.8		%	95.9		96.9	97.2
ROE contribution	(0.1		)	0.6		0.4	0.4
E&S Lines:
Underwriting gain (loss), before federal income tax	$	1,916		3,506		9,439	(4,848	)
Underwriting gain (loss), after federal income tax	1,514			2,770		7,457	(3,830	)
Combined ratio	96.9		%	93.7		94.7	103.0
ROE contribution	0.3			0.6		0.5	(0.3	)
Investments:
Net investment income	$	55,826		52,443		164,949	141,227
Net realized and unrealized investment (losses) gains	(2,183		)	(4,787	)	15,295	(16,988	)
Total investment segment income, before federal income tax	53,643			47,656		180,244	124,239
Tax on investment segment income	10,884			8,562		34,733	21,405
Total investment segment income, after federal income tax	$	42,759		39,094		145,511	102,834
ROE contribution of after-tax net investment income	8.6			10.0		9.1	9.0

Reconciliation of Segment Results to Income Before Federal Income Tax	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019		2018
Underwriting gain (loss)
Standard Commercial Lines	$	30,016		26,333		92,974		74,153
Standard Personal Lines	(631		)	3,158		7,074		6,457
E&S Lines	1,916			3,506		9,439		(4,848	)
Investment income	53,643			47,656		180,244		124,239
Total all segments	84,944			80,653		289,731		200,001
Interest expense	(7,397		)	(6,073	)	(26,289	)	(18,350	)
Corporate expenses	(6,369		)	(7,450	)	(28,345	)	(22,065	)
Income, before federal income tax	$	71,178		67,130		235,097		159,586

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Indebtedness

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Indebtedness

Indebtedness

The table below provides a summary of our outstanding debt at September 30, 2019 and December 31, 2018:

Outstanding Debt	Issuance Date	Maturity Date	Interest Rate		Original Amount		2019	Carry Value
($ in thousands)							Debt Discount and Unamortized Issuance Costs	September 30, 2019	December 31, 2018
Description
Long term
Issuance:
Senior Notes	3/1/2019	3/1/2049	5.375	%	$	300,000	9,065	290,935	—
Redemption:
Senior Notes	2/8/2013	2/9/2043	5.875	%	185,000		—	—	180,771
Other Outstanding:
FHLBI	12/16/2016	12/16/2026	3.03	%	60,000		—	60,000	60,000
FHLBNY	8/15/2016	8/16/2021	1.56	%	25,000		—	25,000	25,000
FHLBNY	7/21/2016	7/21/2021	1.61	%	25,000		—	25,000	25,000
Senior Notes	11/3/2005	11/1/2035	6.70	%	100,000		889	99,111	99,069
Senior Notes	11/16/2004	11/15/2034	7.25	%	50,000		281	49,719	49,700
Finance lease obligations1								904	—
Total long-term debt							10,235	550,669	439,540

¹ Concurrent with the adoption of ASU 2016-02 discussed in Note 2. "Adoption of Accounting Pronouncements," finance lease obligations are now captured in Long-term debt on our Consolidated Balance Sheets.

Short-Term Debt Activity

Short-term debt activity included the following in Nine Months 2019:

• On March 7, 2019, Selective Insurance Company of America (“SICA”) borrowed short-term funds of $50 million from the FHLBNY at an interest rate of 2.64%. This borrowing was repaid on March 28, 2019.

• On August 5, 2019, SICA borrowed short-term funds of $15 million from the FHLBNY at an interest rate of 2.29%. This borrowing was repaid on August 12, 2019.

Long-Term Debt Activity

In the first quarter of 2019, we issued $300 million of 5.375% Senior Notes due 2049 at a discount of $5.9 million which, when coupled with debt issuance costs of approximately $3.3 million, resulted in net proceeds from the offering of $290.8 million. The 5.375% Senior Notes pay interest on March 1 and September 1 of each year. The first interest payment was made on September 1, 2019. A portion of the proceeds from this debt issuance was used to fully redeem the $185 million aggregate principal amount of our 5.875% Senior Notes due 2043, with the remaining $106 million being used for general corporate purposes. The 5.875% Senior Notes had pre-tax debt retirement costs of $4.2 million, or $3.3 million after tax, which was recorded in Interest expense on the Consolidated Statements of Income in the first quarter of 2019.

For detailed information on our indebtedness, see Note 10. "Indebtedness" in Item 8. "Financial Statements and Supplementary Data." of our 2018 Annual Report.

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Comprehensive Income (Tables)

9 Months Ended

Sep. 30, 2019

Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]

Schedule of Components of Comprehensive Income-Gross and Net of Tax

Third Quarter 2019
($ in thousands)	Gross			Tax		Net
Net income	$	71,178		15,028		56,150
Components of OCI:
Unrealized gains on investment securities:
Unrealized holding gains during the period	34,392			7,224		27,168
Amounts reclassified into net income:
HTM securities	(3		)	(1	)	(2	)
Realized losses on disposals and OTTI of AFS securities	2,821			592		2,229
Total unrealized gains on investment securities	37,210			7,815		29,395
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	665			140		525
Total defined benefit pension and post-retirement plans	665			140		525
Other comprehensive income	37,875			7,955		29,920
Comprehensive income	$	109,053		22,983		86,070
Third Quarter 2018
($ in thousands)	Gross			Tax		Net
Net income	$	67,130		11,695		55,435
Components of other comprehensive loss:
Unrealized losses on investment securities:
Unrealized holding losses during the period	(21,565		)	(4,529	)	(17,036	)
Amounts reclassified into net income:
HTM securities	(8		)	(2	)	(6	)
Realized losses on disposals and OTTI of AFS securities	10,839			2,276		8,563
Total unrealized losses on investment securities	(10,734		)	(2,255	)	(8,479	)
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	532			112		420
Total defined benefit pension and post-retirement plans	532			112		420
Other comprehensive loss	(10,202		)	(2,143	)	(8,059	)
Comprehensive income	$	56,928		9,552		47,376

Nine Months 2019
($ in thousands)	Gross			Tax		Net
Net income	$	235,097		45,333		189,764
Components of OCI:
Unrealized gains on investment securities:
Unrealized holding gains during the period	220,864			46,381		174,483
Amounts reclassified into net income:
HTM securities	(33		)	(7	)	(26	)
Realized losses on disposals and OTTI of AFS securities	444			93		351
Total unrealized gains on investment securities	221,275			46,467		174,808
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	1,993			419		1,574
Total defined benefit pension and post-retirement plans	1,993			419		1,574
Other comprehensive income	223,268			46,886		176,382
Comprehensive income	$	458,365		92,219		366,146
Nine Months 2018
($ in thousands)	Gross			Tax		Net
Net income	$	159,586		26,407		133,179
Components of other comprehensive loss:
Unrealized losses on investment securities:
Unrealized holding losses during the period	(130,873		)	(27,484	)	(103,389	)
Amounts reclassified into net income:
HTM securities	(28		)	(6	)	(22	)
Realized losses on disposals and OTTI of AFS securities	18,258			3,834		14,424
Total unrealized losses on investment securities	(112,643		)	(23,656	)	(88,987	)
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	1,595			335		1,260
Total defined benefit pension and post-retirement plans	1,595			335		1,260
Other comprehensive loss	(111,048		)	(23,321	)	(87,727	)
Comprehensive income	$	48,538		3,086		45,452

Schedule of Components of Accumulated Other Comprehensive Income Net of Tax

September 30, 2019								Defined Benefit Pension and Post-Retirement Plans
	Net Unrealized Gains (Losses) on Investment Securities									Total AOCI
($ in thousands)	OTTI Related			HTM Related		All Other	Investments Subtotal
Balance, December 31, 2018	$	(71	)	71		1,888	1,888	(79,844	)	(77,956	)
OCI before reclassifications	—			—		174,483	174,483	—		174,483
Amounts reclassified from AOCI	—			(26	)	351	325	1,574		1,899
Net current period OCI	—			(26	)	174,834	174,808	1,574		176,382
Balance, September 30, 2019	$	(71	)	45		176,722	176,696	(78,270	)	98,426

Schedule of Reclassifications Out Of Accumulated Other Comprehensive Income

	Quarter ended September 30,					Nine Months ended September 30,				Affected Line Item in the Unaudited Consolidated Statements of Income
($ in thousands)	2019			2018		2019		2018
HTM related
Unrealized (gains) losses on HTM disposals	$	(3	)	11		(12	)	5		Net realized and unrealized (losses) gains
Amortization of net unrealized gains on HTM securities	—			(19	)	(21	)	(33	)	Net investment income earned
	(3		)	(8	)	(33	)	(28	)	Income before federal income tax
	1			2		7		6		Total federal income tax expense
	(2		)	(6	)	(26	)	(22	)	Net income
Realized losses on AFS and OTTI
Realized losses on AFS disposals and OTTI	2,821			10,839		444		18,258		Net realized and unrealized (losses) gains
	2,821			10,839		444		18,258		Income before federal income tax
	(592		)	(2,276	)	(93	)	(3,834	)	Total federal income tax expense
	2,229			8,563		351		14,424		Net income
Defined benefit pension and post-retirement life plans
Net actuarial loss	146			112		436		337		Loss and loss expense incurred
	519			420		1,557		1,258		Other insurance expenses
Total defined benefit pension and post-retirement life	665			532		1,993		1,595		Income before federal income tax
	(140		)	(112	)	(419	)	(335	)	Total federal income tax expense
	525			420		1,574		1,260		Net income
Total reclassifications for the period	$	2,752		8,977		1,899		15,662		Net income

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Investments (Held-To-Maturity Securities Disclosure) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
HTM Securities Percent of Invested Assets	1.00%	1.00%
HTM, Carrying Value	$ 26,925	$ 37,110
Net unrealized unrecognized gains on held to maturity securities	1,500	1,300
Gross unrealized unrecognized loss	$ 100	$ 200

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Investments (Other Investment Portfolio by Strategy and the Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy) (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Carrying Value		$ 189,243	$ 178,938
Other Investments [Member]
Carrying Value		189,243	178,938
Remaining Commitment		229,883	202,270
Maximum Exposure to Loss	[1]	419,126	381,208
Alternative Investments [Member]
Carrying Value		165,460	153,896
Remaining Commitment		229,883	202,270
Maximum Exposure to Loss	[1]	395,343	356,166
Private Equity [Member] | Alternative Investments [Member]
Carrying Value		105,922	84,352
Remaining Commitment		97,552	93,688
Maximum Exposure to Loss	[1]	203,474	178,040
Private Credit [Member] | Alternative Investments [Member]
Carrying Value		37,710	41,682
Remaining Commitment		109,797	81,453
Maximum Exposure to Loss	[1]	147,507	123,135
Real Assets [Member] | Alternative Investments [Member]
Carrying Value		21,828	27,862
Remaining Commitment		22,534	27,129
Maximum Exposure to Loss	[1]	44,362	54,991
Other Securities [Member]
Carrying Value		23,783	25,042
Remaining Commitment		0	0
Maximum Exposure to Loss	[1]	$ 23,783	$ 25,042

[1] The maximum exposure to loss includes both the carry value of these investments and the related remaining 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. 

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Segment Information (Income Before and After Federal Income Tax) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Net investment income	$ 55,826	$ 52,443	$ 164,949	$ 141,227
Net realized and unrealized investment (losses) gains	(2,183)	(4,787)	15,295	(16,988)
Total investment income, before federal income tax	53,643	47,656	180,244	124,239
Tax on investment income	10,884	8,562	34,733	21,405
Total investment income, after federal income tax	42,759	39,094	145,511	102,834
Standard Commercial Lines [Member]
Segment Reporting Information [Line Items]
Underwriting gain (loss), before federal income tax	30,016	26,333	92,974	74,153
Underwriting gain (loss), after federal income tax	$ 23,713	$ 20,803	$ 73,450	$ 58,581
Combined ratio	94.20%	94.50%	93.90%	94.80%
ROE Contribution	4.50%	4.90%	5.00%	4.50%
Standard Personal Lines [Member]
Segment Reporting Information [Line Items]
Underwriting gain (loss), before federal income tax	$ (631)	$ 3,158	$ 7,074	$ 6,457
Underwriting gain (loss), after federal income tax	$ (499)	$ 2,495	$ 5,588	$ 5,101
Combined ratio	100.80%	95.90%	96.90%	97.20%
ROE Contribution	(0.10%)	0.60%	0.40%	0.40%
Excess And Surplus Operations [Member]
Segment Reporting Information [Line Items]
Underwriting gain (loss), before federal income tax	$ 1,916	$ 3,506	$ 9,439	$ (4,848)
Underwriting gain (loss), after federal income tax	$ 1,514	$ 2,770	$ 7,457	$ (3,830)
Combined ratio	96.90%	93.70%	94.70%	103.00%
ROE Contribution	0.30%	0.60%	0.50%	(0.30%)
Investments [Member]
Segment Reporting Information [Line Items]
ROE Contribution	8.60%	10.00%	9.10%	9.00%

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Reinsurance (Ceded Premiums and Losses Related to Flood Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Ceded premiums written	$ (115,634)	$ (108,250)	$ (326,939)	$ (308,846)
Ceded premiums earned	(105,608)	(98,704)	(311,105)	(295,232)
Ceded loss and loss expenses incurred	(43,305)	(104,757)	$ (145,712)	(175,786)
National Flood Insurance Program [Member]
Percentage of NFIP claims ceded by federal government			100.00%
Ceded premiums written	(74,864)	(70,100)	$ (206,451)	(193,110)
Ceded premiums earned	(65,847)	(61,448)	(191,914)	(180,582)
Ceded loss and loss expenses incurred	$ (27,459)	$ (89,396)	$ (62,208)	$ (115,376)

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Fair Value Measurements (Quantitative Disclosures of Fair Value Assets) (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
AFS Fixed Income Securities		$ 5,930,237	$ 5,273,100
Equity Securities		79,213	147,639
Short-term investments		326,121	323,864
Net Asset Value		33,200	37,300
Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities		5,930,237	5,273,100
Equity Securities		79,213	147,639
Short-term investments		326,121	323,864
Total assets measured at fair value		6,335,571	5,744,603
U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities		120,900	121,310
Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities		21,520	23,131
Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities		1,190,615	1,138,469
Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities		1,838,927	1,617,408
Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities		768,383	717,362
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities		555,731	527,078
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities		1,434,161	1,128,342
Common Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity Securities	[1]	76,179	144,727
Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity Securities		3,034	2,912
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities	[2]	41,619	78,381
Equity Securities	[2]	46,022	110,309
Short-term investments	[2]	319,599	321,370
Total assets measured at fair value	[2]	407,240	510,060
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities	[2]	41,619	78,381
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities	[2]	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities	[2]	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities	[2]	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities	[2]	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities	[2]	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities	[2]	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity Securities	[1],[2]	42,988	107,397
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity Securities	[2]	3,034	2,912
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities	[2]	5,852,389	5,187,310
Equity Securities	[2]	0	0
Short-term investments	[2]	6,522	2,494
Total assets measured at fair value	[2]	5,858,911	5,189,804
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities	[2]	79,281	42,929
Significant Other Observable Inputs (Level 2) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities	[2]	21,520	23,131
Significant Other Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities	[2]	1,190,615	1,138,469
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities	[2]	1,822,577	1,617,408
Significant Other Observable Inputs (Level 2) [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities	[2]	748,504	709,953
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities	[2]	555,731	527,078
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities	[2]	1,434,161	1,128,342
Significant Other Observable Inputs (Level 2) [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity Securities	[1],[2]	0	0
Significant Other Observable Inputs (Level 2) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity Securities	[2]	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities		36,229	7,409
Equity Securities		0	0
Short-term investments		0	0
Total assets measured at fair value		36,229	7,409
Significant Unobservable Inputs (Level 3) [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities		16,350	0
Significant Unobservable Inputs (Level 3) [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities		19,879	7,409
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
AFS Fixed Income Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity Securities	[1]	0	0
Significant Unobservable Inputs (Level 3) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity Securities		$ 0	$ 0

[1] Investments amounting to $33.2 million at September 30, 2019, and $37.3 million at December 31, 2018, were measured at fair value using net asset value per share (or its practical expedient) and have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to total assets measured at fair value.

[2] There were no transfers of securities between Level 1 and Level 2.

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Investments (Investments Pledged as Collateral) (Details) $ in Millions	Sep. 30, 2019 USD ($)
Financial Instruments Owned and Pledged as Collateral [Line Items]
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	$ 27.1
Securities Pledged As Collateral	192.5
U.S. Government and Government Agencies [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	22.9
Securities Pledged As Collateral	22.9
Obligations of States and Political Subdivisions [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	3.9
Securities Pledged As Collateral	3.9
Corporate Securities [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	0.3
Securities Pledged As Collateral	0.3
Commercial Mortgage Backed Securities [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	0.0
Securities Pledged As Collateral	26.9
Residential Mortgage Backed Securities [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	0.0
Securities Pledged As Collateral	138.5
Federal Home Loan Bank of Indianapolis [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	64.7
Federal Home Loan Bank of Indianapolis [Member] | U.S. Government and Government Agencies [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	0.0
Federal Home Loan Bank of Indianapolis [Member] | Obligations of States and Political Subdivisions [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	0.0
Federal Home Loan Bank of Indianapolis [Member] | Corporate Securities [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	0.0
Federal Home Loan Bank of Indianapolis [Member] | Commercial Mortgage Backed Securities [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	7.3
Federal Home Loan Bank of Indianapolis [Member] | Residential Mortgage Backed Securities [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	57.4
Federal Home Loan Bank of New York [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	100.7
Federal Home Loan Bank of New York [Member] | U.S. Government and Government Agencies [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	0.0
Federal Home Loan Bank of New York [Member] | Obligations of States and Political Subdivisions [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	0.0
Federal Home Loan Bank of New York [Member] | Corporate Securities [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	0.0
Federal Home Loan Bank of New York [Member] | Commercial Mortgage Backed Securities [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	19.6
Federal Home Loan Bank of New York [Member] | Residential Mortgage Backed Securities [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	$ 81.1

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Investments (Components Of Net Realized and Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on disposals of securities, fixed income securities (excluding OTTI charges)	$ 20,425	$ (751)	$ 26,752	$ 4,034
OTTI Charges	(2,291)	(1,426)	(3,366)	(5,459)
Net realized gains (losses)	18,134	(2,177)	23,386	(1,425)
Unrealized (losses) recognized in income on equity securities	(20,317)	(2,610)	(8,091)	(15,563)
Net realized and unrealized investment (losses) gains	(2,183)	(4,787)	15,295	(16,988)
Fixed Income Securities [Member]
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on disposals of securities, fixed income securities (excluding OTTI charges)	(1,141)	(9,413)	2,063	(13,922)
Equity Securities [Member]
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on disposals of securities, fixed income securities (excluding OTTI charges)	21,602	8,665	24,733	17,960
Short-Term Investments [Member]
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on disposals of securities, fixed income securities (excluding OTTI charges)	(36)	2	(21)	1
Other Investments [Member]
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on disposals of securities, fixed income securities (excluding OTTI charges)	$ 0	$ (5)	$ (23)	$ (5)

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Indebtedness (Short Term Debt Activity) (Details) $ in Millions	Sep. 30, 2019 USD ($)
Two Point Sixty Four Percent Borrowing from Federal Home Loan Bank Due March 28, 2019 [Member]
Short-term Debt [Line Items]
Federal Home Loan Bank Advances	$ 50
Federal Home Loan Bank, Advances, Interest Rate	2.64%
Two Point Twenty Nine Percent Borrowing from Federal Home Loan Bank Due August 12, 2019 [Member]
Short-term Debt [Line Items]
Federal Home Loan Bank Advances	$ 15
Federal Home Loan Bank, Advances, Interest Rate	2.29%

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Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Oct. 18, 2019
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	001-33067
Entity Registrant Name	SELECTIVE INSURANCE GROUP, INC
Entity Incorporation, State or Country Code	NJ
Entity Tax Identification Number	22-2168890
Entity Address, Address Line One	40 Wantage Avenue
Entity Address, City or Town	Branchville
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07890
City Area Code	973
Local Phone Number	948-3000
Title of 12(b) Security	Common Stock, par value $2 per share
Trading Symbol	SIGI
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock , Shares Outstanding		59,401,565
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Central Index Key	0000230557
Current Fiscal Year End Date	--12-31

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Leases (Components of Lease Expense) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Lease Expense [Line Items]
Operating lease cost	$ 2,234	$ 6,631
Finance lease cost: Amortization of assets	217	816
Finance lease cost: Interest on lease liabilities	5	12
Total finance lease cost	222	828
Variable lease cost	(548)	120
Short-term lease cost	$ 502	$ 1,677

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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net income, Gross	$ 71,178	$ 67,130	$ 235,097	$ 159,586
Unrealized holding gains (losses) during the period, Gross	34,392	(21,565)	220,864	(130,873)
Amounts reclassified into net income: HTM securities, Gross	(3)	(8)	(33)	(28)
Amounts reclassified into net income: Realized losses on disposals and OTTI of AFS securities, Gross	2,821	10,839	444	18,258
Total unrealized gains (losses) on investment securities, Gross	37,210	(10,734)	221,275	(112,643)
Amount reclassified into net income: Net actuarial loss, Gross	665	532	1,993	1,595
Total defined pension and other post-retirement benefit plans, Gross	665	532	1,993	1,595
Other comprehensive income (loss), Gross	37,875	(10,202)	223,268	(111,048)
Comprehensive income before tax	109,053	56,928	458,365	48,538
Net income, Tax	15,028	11,695	45,333	26,407
Unrealized holding gains (losses) during the period, Tax	7,224	(4,529)	46,381	(27,484)
Amounts reclassified into net income: HTM securities, Tax	(1)	(2)	(7)	(6)
Amounts reclassified into net income: Realized losses on disposals and OTTI of AFS securities, Tax	592	2,276	93	3,834
Total unrealized gains (losses) on investment securities, Tax	7,815	(2,255)	46,467	(23,656)
Amount reclassified into net income: Net actuarial loss, Tax	140	112	419	335
Total defined pension and other post-retirement benefit plans, Tax	140	112	419	335
Other comprehensive income (loss), Tax	7,955	(2,143)	46,886	(23,321)
Comprehensive income, Tax	22,983	9,552	92,219	3,086
Net income	56,150	55,435	189,764	133,179
Unrealized holding gains (losses) arising during period	27,168	(17,036)	174,483	(103,389)
Amounts reclassified into net income: HTM Securities	(2)	(6)	(26)	(22)
Amounts reclassified into net income: Realized losses on disposals and OTTI of available-for-sale securities	2,229	8,563	351	14,424
Total unrealized gains (losses) on investment securities	29,395	(8,479)	174,808	(88,987)
Amount reclassified into net income: Net actuarial loss	525	420	1,574	1,260
Total defined benefit pension and post-retirement plans	525	420	1,574	1,260
Other comprehensive income (loss)	29,920	(8,059)	176,382	(87,727)
Comprehensive income	$ 86,070	$ 47,376	$ 366,146	$ 45,452

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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net income	$ 56,150	$ 55,435	$ 189,764	$ 133,179
Unrealized holding gains (losses) arising during period	27,168	(17,036)	174,483	(103,389)
Amounts reclassified into net income: Held-to-maturity securities	(2)	(6)	(26)	(22)
Amounts reclassified into net income: Realized losses on disposals and OTTI of available-for-sale securities	2,229	8,563	351	14,424
Total unrealized gains (losses) on investment securities	29,395	(8,479)	174,808	(88,987)
Amount reclassified into net income: Net actuarial loss	525	420	1,574	1,260
Total defined benefit pension and post-retirement plans	525	420	1,574	1,260
Other comprehensive income (loss)	29,920	(8,059)	176,382	(87,727)
Comprehensive income	$ 86,070	$ 47,376	$ 366,146	$ 45,452

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Basis of Presentation

9 Months Ended

Sep. 30, 2019

Basis of Presentation And Significant Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

As used herein, the "Company,” “we,” “us,” or “our” refers to Selective Insurance Group, Inc. (the "Parent"), and its subsidiaries, except as expressly indicated or unless the context otherwise requires. Our interim unaudited consolidated financial statements (“Financial Statements”) have been prepared by us in conformity with U.S. generally accepted accounting principles (“GAAP”) and the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding interim financial reporting. The preparation of the Financial Statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported financial statement balances, as well as the disclosure of contingent assets and liabilities. Actual results could differ from those estimates. All significant intercompany accounts and transactions between the Parent and its subsidiaries are eliminated in consolidation.

Our Financial Statements reflect all adjustments that, in our opinion, are normal, recurring, and necessary for a fair presentation of our results of operations and financial condition. Our Financial Statements cover the third quarters ended September 30, 2019 (“Third Quarter 2019”) and September 30, 2018 (“Third Quarter 2018”) and the nine-month periods ended September 30, 2019 (“Nine Months 2019”) and September 30, 2018 (“Nine Months 2018”). These Financial Statements do not include all of the information and disclosures required by GAAP and the SEC for audited annual financial statements. Additionally, results of operations for any interim period are not necessarily indicative of results for a full year. Consequently, our Financial Statements should be read in conjunction with the consolidated financial statements contained in our Annual Report on Form 10-K for the year ended December 31, 2018 (“2018 Annual Report”) filed with the SEC.

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Retirement Plans (Table)

9 Months Ended

Sep. 30, 2019

Retirement Benefits [Abstract]

Schedule of Components of Net Periodic Benefit Cost

	Pension Plan					Pension Plan
	Quarter ended September 30,					Nine Months ended September 30,
($ in thousands)	2019			2018		2019		2018
Net Periodic Pension Cost (Benefit):
Interest cost	$	3,376		3,095		10,129		9,285
Expected return on plan assets	(5,278		)	(5,681	)	(15,835	)	(17,044	)
Amortization of unrecognized net actuarial loss	644			494		1,931		1,481
Total net periodic pension cost (benefit)1	$	(1,258	)	(2,092	)	(3,775	)	(6,278	)

¹ The components of net periodic pension cost (benefit) are included within "Loss and loss expense incurred" and "Other insurance expenses" on the Consolidated Statements of Income.

Schedule of Weighted-Average Expense Assumptions

	Pension Plan
	Nine Months ended September 30,
	2019		2018
Weighted-Average Expense Assumptions:
Discount rate	4.46	%	3.78	%
Effective interest rate for calculation of interest cost	4.12		3.46
Expected return on plan assets	6.50		6.36

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2019

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis

Schedule of Carrying Values and Estimated Fair Values of Financial Liabilities

	September 30, 2019			December 31, 2018
($ in thousands)	Carrying Amount		Fair Value	Carrying Amount		Fair Value
Financial Liabilities
Long-term debt:
7.25% Senior Notes	49,909		65,770	49,907		57,032
6.70% Senior Notes	99,476		125,954	99,462		107,075
5.875% Senior Notes	—		—	185,000		177,230
5.375% Senior Notes	294,136		352,156	—		—
1.61% borrowings from FHLBNY	25,000		24,838	25,000		24,218
1.56% borrowings from FHLBNY	25,000		24,808	25,000		24,162
3.03% borrowings from FHLBI	60,000		63,741	60,000		58,905
Subtotal long-term debt	553,521		657,267	444,369		448,622
Unamortized debt issuance costs	(3,756	)		(4,829	)
Finance lease obligations	904			—
Total long-term debt	550,669			439,540

Schedule of Quantitative Disclosures of Our Financial Assets That Were Measured At Fair Value

September 30, 2019			Fair Value Measurements Using
($ in thousands)	Assets Measured at Fair Value		Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)1	Significant Other  Observable Inputs  (Level 2)1	Significant Unobservable  Inputs  (Level 3)
Description
Measured on a recurring basis:
AFS fixed income securities:
U.S. government and government agencies	$	120,900	41,619	79,281	—
Foreign government	21,520		—	21,520	—
Obligations of states and political subdivisions	1,190,615		—	1,190,615	—
Corporate securities	1,838,927		—	1,822,577	16,350
CLO and other ABS	768,383		—	748,504	19,879
CMBS	555,731		—	555,731	—
RMBS	1,434,161		—	1,434,161	—
Total AFS fixed income securities	5,930,237		41,619	5,852,389	36,229
Equity securities:
Common stock2	76,179		42,988	—	—
Preferred stock	3,034		3,034	—	—
Total equity securities	79,213		46,022	—	—
Short-term investments	326,121		319,599	6,522	—
Total assets measured at fair value	$	6,335,571	407,240	5,858,911	36,229

December 31, 2018			Fair Value Measurements Using
($ in thousands)	Assets Measured at Fair Value		Quoted Prices in  Active Markets for Identical Assets/Liabilities (Level 1)1	Significant Other Observable Inputs  (Level 2)1	Significant Unobservable Inputs  (Level 3)
Description
Measured on a recurring basis:
AFS fixed income securities:
U.S. government and government agencies	$	121,310	78,381	42,929	—
Foreign government	23,131		—	23,131	—
Obligations of states and political subdivisions	1,138,469		—	1,138,469	—
Corporate securities	1,617,408		—	1,617,408	—
CLO and other ABS	717,362		—	709,953	7,409
CMBS	527,078		—	527,078	—
RMBS	1,128,342		—	1,128,342	—
Total AFS fixed income securities	5,273,100		78,381	5,187,310	7,409
Equity securities:
Common stock2	144,727		107,397	—	—
Preferred stock	2,912		2,912	—	—
Total equity securities	147,639		110,309	—	—
Short-term investments	323,864		321,370	2,494	—
Total assets measured at fair value	$	5,744,603	510,060	5,189,804	7,409

¹  There were no transfers of securities between Level 1 and Level 2.

² 

Investments amounting to $33.2 million at September 30, 2019, and $37.3 million at December 31, 2018, were measured at fair value using net asset value per share (or its practical expedient) and have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to total assets measured at fair value

Schedule of Changes in Fair Value of Securities Using Level 3 Inputs

September 30, 2019
($ in thousands)	Corporate Securities		CLO and Other ABS		Total
Fair value, December 31, 2018	—		7,409		7,409
Total net (losses) gains for the period included in:
OCI	(69	)	(14	)	(83	)
Net income	—		244		244
Purchases	—		18,404		18,404
Sales	—		—		—
Issuances	—		—		—
Settlements	—		(105	)	(105	)
Transfers into Level 3	16,419		13,603		30,022
Transfers out of Level 3	—		(19,662	)	(19,662	)
Fair value, September 30, 2019	16,350		19,879		36,229

Schedule of Quantitative Information of Our Financial Assets and Liabilities That Were Disclosed at Fair Value

September 30, 2019			Fair Value Measurements Using
($ in thousands)	Assets/ Liabilities Disclosed at Fair Value		Quoted Prices in  Active Markets for  Identical Assets/ Liabilities (Level 1)	Significant Other Observable Inputs (Level 2)	Significant Unobservable Inputs (Level 3)
Financial Assets
HTM:
Obligations of states and political subdivisions	$	9,426	—	9,426	—
Corporate securities	18,930		—	18,930	—
Total HTM fixed income securities	$	28,356	—	28,356	—
Financial Liabilities
Long-term debt:
7.25% Senior Notes	$	65,770	—	65,770	—
6.70% Senior Notes	125,954		—	125,954	—
5.375% Senior Notes	352,156		—	352,156	—
1.61% borrowings from FHLBNY	24,838		—	24,838	—
1.56% borrowings from FHLBNY	24,808		—	24,808	—
3.03% borrowings from FHLBI	63,741		—	63,741	—
Total long-term debt	$	657,267	—	657,267	—

December 31, 2018			Fair Value Measurements Using
($ in thousands)	Assets/ Liabilities Disclosed at Fair Value		Quoted Prices in  Active Markets for  Identical Assets/ Liabilities (Level 1)	Significant Other Observable Inputs (Level 2)	Significant Unobservable Inputs (Level 3)
Financial Assets
HTM:
Obligations of states and political subdivisions	$	17,969	—	17,969	—
Corporate securities	20,348		—	20,348	—
Total HTM fixed income securities	$	38,317	—	38,317	—
Financial Liabilities
Long-term debt:
7.25% Senior Notes	$	57,032	—	57,032	—
6.70% Senior Notes	107,075		—	107,075	—
5.875% Senior Notes	177,230		177,230	—	—
1.61% borrowings from FHLBNY	24,218		—	24,218	—
1.56% borrowings from FHLBNY	24,162		—	24,162	—
3.03% borrowings from FHLBI	58,905		—	58,905	—
Total long-term debt	$	448,622	177,230	271,392	—

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Litigation

9 Months Ended

Sep. 30, 2019

Loss Contingency, Information about Litigation Matters [Abstract]

Litigation

Litigation

In the ordinary course of conducting business, we can be named as defendants in various legal actions. Most are claims litigation involving our Insurance Subsidiaries as either: (i) liability insurers defending or providing indemnity for third-party claims brought against our customers; or (ii) insurers defending first-party coverage claims brought against them. We account for such activity through the establishment of unpaid loss and loss expense reserves. In ordinary course claims litigation, we expect that any potential ultimate liability, after consideration of provisions made for potential losses and costs of defense, will not be material to our consolidated financial condition, results of operations, or cash flows.

From time to time, our Insurance Subsidiaries also are named as defendants in other legal actions, some of which assert claims for substantial amounts. Plaintiffs may style these actions as putative class actions and seek judicial certification of a state or national class for allegations such as improper reimbursement of medical providers paid under workers compensation and personal and commercial automobile insurance policies or improper reimbursement for automobile parts. Similarly, our Insurance Subsidiaries can be named in individual actions seeking extra-contractual damages, punitive damages, or penalties, often alleging bad faith in the handling of insurance claims. We believe that we have valid defenses to these allegations and we account for such activity through the establishment of unpaid loss and loss expense reserves. In these other legal actions, we expect that any potential ultimate liability, after consideration of provisions made for estimated losses, will not be material to our consolidated financial condition. Nonetheless, litigation outcomes are inherently unpredictable and, because the amounts sought in certain of these actions are large or indeterminate, it is possible that any adverse outcomes could have a material adverse effect on our consolidated results of operations or cash flows in particular quarterly or annual periods.

As of September 30, 2019, we do not believe we are involved in any legal action that could have a material adverse effect on our consolidated financial condition, results of operations, or cash flows.