10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-Q

(Mark One)

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

For the quarterly period ended: June 30, 2017

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)

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.

Yesx           No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted 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 and post such files).

Yesx           No o

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 x	Accelerated filer o
Non-accelerated filer o   (Do not check if a smaller reporting company)
Emerging growth company o	Smaller reporting company o

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.

o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).                                                              Yeso          Nox

As of July 14, 2017, there were 58,364,187 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 June 30, 2017 (Unaudited) and December 31, 2016	1
	Unaudited Consolidated Statements of Income for the Quarter and Six Months Ended June 30, 2017 and 2016	2
	Unaudited Consolidated Statements of Comprehensive Income for the Quarter and Six Months Ended June 30, 2017 and 2016	3
	Unaudited Consolidated Statements of Stockholders' Equity for the Six Months Ended June 30, 2017 and 2016	4
	Unaudited Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2017 and 2016	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	24
	Introduction	24
	Critical Accounting Policies and Estimates	25
	Financial Highlights of Results for Second Quarter and Six Months 2017 and Second Quarter and Six Months 2016	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	41
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	42
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	43
Item 6.	Exhibits	43
Signatures		44

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS.

SELECTIVE INSURANCE GROUP, INC. CONSOLIDATED BALANCE SHEETS	Unaudited
($ in thousands, except share amounts)	June 30, 2017			December 31, 2016
ASSETS
Investments:
Fixed income securities, held-to-maturity – at carrying value (fair value:  $75,540 – 2017; $105,211 – 2016)	$	72,514		101,556
Fixed income securities, available-for-sale – at fair value (amortized cost: $4,923,005 – 2017; $4,753,759 – 2016)	5,018,722			4,792,540
Equity securities, available-for-sale – at fair value (cost:  $131,463 – 2017; $120,889 – 2016)	161,694			146,753
Short-term investments (at cost which approximates fair value)	133,706			221,701
Other investments	116,411			102,397
Total investments (Note 4 and 6)	5,503,047			5,364,947
Cash	8,628			458
Interest and dividends due or accrued	40,231			40,164
Premiums receivable, net of allowance for uncollectible accounts of:  $6,627 – 2017; $5,980 – 2016	764,340			681,611
Reinsurance recoverable, net of allowance for uncollectible accounts of: $5,200 – 2017; $5,500 – 2016	601,887			621,537
Prepaid reinsurance premiums	151,898			146,282
Current federal income tax	—			2,486
Deferred federal income tax	60,388			84,840
Property and equipment – at cost, net of accumulated depreciation and amortization of: $206,847 – 2017; $198,729 – 2016	66,255			69,576
Deferred policy acquisition costs	234,903			222,564
Goodwill	7,849			7,849
Other assets	88,778			113,534
Total assets	$	7,528,204		7,355,848
LIABILITIES AND STOCKHOLDERS’ EQUITY
Liabilities:
Reserve for losses and loss expenses (Note 8)	$	3,731,221		3,691,719
Unearned premiums	1,352,068			1,262,819
Long-term debt	438,894			438,667
Current federal income tax	2,104			—
Accrued salaries and benefits	103,177			132,880
Other liabilities	248,184			298,393
Total liabilities	$	5,875,648		5,824,478
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: 102,150,866 – 2017; 101,620,436 – 2016	204,302			203,241
Additional paid-in capital	359,982			347,295
Retained earnings	1,641,820			1,568,881
Accumulated other comprehensive income (loss) (Note 11)	24,497			(15,950	)
Treasury stock – at cost (shares:  43,788,147 – 2017; 43,653,237 – 2016)	(578,045		)	(572,097	)
Total stockholders’ equity	$	1,652,556		1,531,370
Commitments and contingencies
Total liabilities and stockholders’ equity	$	7,528,204		7,355,848

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 June 30,					Six Months ended June 30,
($ in thousands, except per share amounts)	2017			2016		2017		2016
Revenues:
Net premiums earned	$	568,030		531,932		1,128,884		1,054,390
Net investment income earned	41,430			31,182		78,849		61,951
Net realized gains (losses):
Net realized investment gains	2,951			2,314		5,381		3,203
Other-than-temporary impairments	(1,211		)	(559	)	(4,686	)	(4,152	)
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	(6		)	10		(6	)	10
Total net realized gains (losses)	1,734			1,765		689		(939	)
Other income	3,291			3,868		6,532		4,819
Total revenues	614,485			568,747		1,214,954		1,120,221
Expenses:
Losses and loss expenses incurred	341,559			298,479		659,031		595,623
Policy acquisition costs	196,824			190,731		393,052		373,958
Interest expense	6,081			5,620		12,187		11,226
Other expenses	11,092			11,606		24,181		25,228
Total expenses	555,556			506,436		1,088,451		1,006,035
Income before federal income tax	58,929			62,311		126,503		114,186
Federal income tax expense:
Current	17,785			18,318		32,058		32,402
Deferred	(282		)	392		2,579		1,151
Total federal income tax expense	17,503			18,710		34,637		33,553
Net income	$	41,426		43,601		91,866		80,633
Earnings per share:
Basic net income	$	0.71		0.75		1.57		1.40
Diluted net income	$	0.70		0.74		1.55		1.38
Dividends to stockholders	$	0.16		0.15		0.32		0.30

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 June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Net income	$	41,426		43,601		91,866		80,633
Other comprehensive income, net of tax:
Unrealized gains on investment securities:
Unrealized holding gains arising during period	23,326			36,188		40,087		78,917
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income	4			(6	)	4		(6	)
Amounts reclassified into net income:
Held-to-maturity securities	(28		)	(12	)	(60	)	(59	)
Realized (gains) losses on available-for-sale securities	(1,225		)	(1,145	)	(244	)	609
Total unrealized gains on investment securities	22,077			35,025		39,787		79,461
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	330			985		660		1,971
Total defined benefit pension and post-retirement plans	330			985		660		1,971
Other comprehensive income	22,407			36,010		40,447		81,432
Comprehensive income	$	63,833		79,611		132,313		162,065

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	Six Months ended June 30,
($ in thousands, except per share amounts)	2017			2016
Common stock:
Beginning of year	$	203,241		201,723
Dividend reinvestment plan (shares:  15,419 – 2017; 20,808 – 2016)	31			42
Stock purchase and compensation plans (shares:  515,011 – 2017; 569,034 – 2016)	1,030			1,138
End of period	204,302			202,903
Additional paid-in capital:
Beginning of year	347,295			326,656
Dividend reinvestment plan	693			696
Stock purchase and compensation plans	11,994			12,757
End of period	359,982			340,109
Retained earnings:
Beginning of year	1,568,881			1,446,192
Net income	91,866			80,633
Dividends to stockholders ($0.32 per share – 2017; $0.30 per share – 2016)	(18,927		)	(17,583	)
End of period	1,641,820			1,509,242
Accumulated other comprehensive income:
Beginning of year	(15,950		)	(9,425	)
Other comprehensive income	40,447			81,432
End of period	24,497			72,007
Treasury stock:
Beginning of year	(572,097		)	(567,105	)
Acquisition of treasury stock (shares: 134,910 – 2017; 138,007 – 2016)	(5,948		)	(4,419	)
End of period	(578,045		)	(571,524	)
Total stockholders’ equity	$	1,652,556		1,552,737

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	Six Months ended June 30,
($ in thousands)	2017			2016
Operating Activities
Net income	$	91,866		80,633
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	25,409			30,155
Stock-based compensation expense	8,372			7,203
Undistributed (gains) losses of equity method investments	(3,575		)	1,677
Loss on disposal of fixed assets	998			—
Net realized (gains) losses	(689		)	939
Changes in assets and liabilities:
Increase in reserve for losses and loss expenses, net of reinsurance recoverable	59,152			41,986
Increase in unearned premiums, net of prepaid reinsurance	83,633			89,109
Decrease in net federal income taxes	7,263			2,380
Increase in premiums receivable	(82,729		)	(91,391	)
Increase in deferred policy acquisition costs	(12,339		)	(15,395	)
Increase in interest and dividends due or accrued	(204		)	(1,030	)
Decrease in accrued salaries and benefits	(29,703		)	(48,603	)
Decrease (increase) in other assets	24,953			(3,877	)
Decrease in other liabilities	(48,684		)	(34,659	)
Net cash provided by operating activities	123,723			59,127
Investing Activities
Purchase of fixed income securities, held-to-maturity	—			(4,235	)
Purchase of fixed income securities, available-for-sale	(1,194,142		)	(411,538	)
Purchase of equity securities, available-for-sale	(22,115		)	(16,796	)
Purchase of other investments	(22,121		)	(17,734	)
Purchase of short-term investments	(2,259,305		)	(691,496	)
Sale of fixed income securities, available-for-sale	717,072			22,114
Sale of short-term investments	2,348,892			680,865
Redemption and maturities of fixed income securities, held-to-maturity	28,730			44,615
Redemption and maturities of fixed income securities, available-for-sale	300,430			264,244
Sale of equity securities, available-for-sale	6,289			83,793
Distributions from other investments	9,843			13,380
Purchase of property and equipment	(7,047		)	(8,187	)
Net cash used in investing activities	(93,474		)	(40,975	)
Financing Activities
Dividends to stockholders	(17,922		)	(16,569	)
Acquisition of treasury stock	(5,948		)	(4,419	)
Net proceeds from stock purchase and compensation plans	4,045			4,368
Proceeds from borrowings	64,000			55,000
Repayments of borrowings	(64,000		)	(55,000	)
Excess tax benefits from share-based payment arrangements	—			1,761
Repayments of capital lease obligations	(2,254		)	(2,661	)
Net cash used in financing activities	(22,079		)	(17,520	)
Net increase in cash	8,170			632
Cash, beginning of year	458			898
Cash, end of period	$	8,628		1,530

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 second quarters ended June 30, 2017 (“Second Quarter 2017”) and June 30, 2016 (“Second Quarter 2016”) and the six-month periods ended June 30, 2017 ("Six Months 2017") and June 30, 2016 ("Six Months 2016"). The Financial Statements do not include all of the information and disclosures required by GAAP and the SEC for audited annual financial statements. 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, 2016 (“2016 Annual Report”) filed with the SEC.

NOTE 2. Adoption of Accounting Pronouncements 

In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") 2016-09, Compensation - Stock Compensation: Improvements to Employee Share-based Payment Accounting (“ASU 2016-09”). ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions. We adopted this guidance on January 1, 2017, which resulted in the following impacts on our consolidated financial statements:

Consolidated Statements of Income

The new standard requires that the tax effects of share-based compensation be recognized in the income tax provision as discrete items outside of the annual estimated expected tax rate. In addition, all excess tax benefits and tax deficiencies should be recognized as income tax benefit or expense in the income statement. Previously, these amounts were recorded in additional paid-in capital. In addition, in calculating potential common shares used to determine diluted earnings per share, GAAP requires us to use the treasury stock method. The new standard requires that assumed proceeds under the treasury stock method be modified to exclude the amount of excess tax benefits that would have been recognized in additional paid-in capital. These changes were adopted on a prospective basis. As a result of adoption, we recognized an income tax benefit in the Consolidated Statements of Income of $0.4 million in Second Quarter 2017 and $3.3 million in Six Months 2017 related to stock grants that have vested this year.

In recording share-based compensation expense, ASU 2016-09 allows companies to make a policy election as to whether they will include an estimate of awards expected to be forfeited or whether they will account for forfeitures as they occur. We have elected to include an estimate of forfeitures in the computation of our share-based compensation expense. As this treatment is consistent with previous guidance, this election had no impact on our consolidated financial statements.

Consolidated Statements of Cash Flows

ASU 2016-09 requires that excess tax benefits from share-based awards be reported as operating activities in the consolidated statement of cash flows. Previously, these cash flows were included in financing activities. We elected to apply this change on a prospective basis; therefore, no changes have been made to the prior periods disclosed in this report.

The standard also requires that employee taxes paid when an employer withholds shares for tax-withholding purposes be reported as financing activities in the consolidated statement of cash flows. This requirement has no impact to us as we have historically reported these cash flows as part of financing activities.

In October 2016, the FASB issued ASU 2016-17, Consolidation: Interests Held through Related Parties That Are Under Common Control ("ASU 2016-17"). ASU 2016-17 changes how a decision maker considers indirect interests in a variable interest entity ("VIE") held under common control in making the primary beneficiary determination. ASU 2016-17 was effective for annual periods beginning after December 15, 2016, including interim periods within those annual periods. The adoption of ASU 2016-17 did not impact us, as we are not the decision maker in any of the VIEs in which we are invested.

6

Pronouncements to be effective in the future

In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). ASU 2016-01 provides guidance to improve certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. Specifically the guidance: (i) requires equity investments to be measured at fair value with changes in fair value recognized in earnings; (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment; (iii) eliminates the requirement to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost; (iv) requires the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes; and (v) clarifies that the need for a valuation allowance on a deferred tax asset related to an available-for-sale ("AFS") security should be evaluated with other deferred tax assets.

ASU 2016-01 is effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods. Our adoption of this guidance will require a cumulative-effect adjustment to the balance sheet as of January 1, 2018 in an amount equal to the after-tax net unrealized gain or loss on our equity portfolio as of year-end 2017. If this guidance had been adopted as of the beginning of 2017, the cumulative-effect adjustment would have been approximately $17 million and we would have recognized additional after-tax net income of approximately $3 million or $0.05 per diluted share, reflecting the change in fair value during Six Months 2017.

In February 2016, the FASB issued ASU 2016-02, Leases (“ASU 2016-02”). ASU 2016-02 requires all lessees to recognize a lease liability and a right-of-use asset, measured at the present value of the future minimum lease payments, at the lease commencement date. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim reporting periods within that fiscal year, with early adoption permitted. ASU 2016-02 requires the application of a modified retrospective approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. While we are currently evaluating ASU 2016-02, we do not expect a material impact on our financial condition or results of operations from the adoption of this guidance.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (“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 debt securities, trade receivables, and reinsurance receivables. ASU 2016-13 requires a valuation allowance to be calculated on these 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. ASU 2016-13 is effective for fiscal years beginning after December 15, 2019, including interim periods within those annual periods. Early adoption is permitted, but no earlier than fiscal years beginning after December 15, 2018. We are currently evaluating the impact of this guidance on our financial condition and results of operations.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (“ASU 2016-15”). ASU 2016-15 adds or clarifies guidance on the classification of certain cash receipts and payments in the statement of cash flows, including, but not limited to: (i) debt prepayment or debt extinguishment costs; (ii) proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; (iii) distributions received from equity method investees; and (iv) separately identifiable cash flows and application of the predominance principle. ASU 2016-15 is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. We are currently evaluating the impact of this guidance on our statement of cash flows.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows: Restricted Cash ("ASU 2016-18"). ASU 2016-18, requires that restricted cash and restricted cash equivalents be included with cash and cash equivalents in the reconciliation of beginning and ending cash on the statements of cash flows. This update also requires a reconciliation of the statement of the cash flows to the balance sheet if the balance sheet includes more than one line item of cash, cash equivalents, and restricted cash. ASU 2016-18 is effective, with retrospective adoption, for annual periods beginning after December 15, 2017, and interim periods within those annual periods. We currently have restricted cash associated with the National Flood Insurance Program ("NFIP") in "Other assets." This literature will impact the presentation of this item in both the Consolidated Balance Sheets and the Statements of Cash Flows.

In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other: Simplifying the Test for Goodwill Impairment (“ASU 2017-04”). ASU 2017-04 eliminates the second step of the two part goodwill impairment test, which

7

required entities to determine the fair value of individual assets and liabilities of a reporting unit to measure the goodwill impairment. Under the new guidance, a goodwill impairment is calculated as the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The amendments in this update should be applied on a prospective basis for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. We do not expect a material impact on our financial condition or results of operations from the adoption of this guidance.

In March 2017, the FASB issued ASU 2017-07, Compensation-Retirement Benefits:Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost ("ASU 2017-07"). ASU 2017-07 requires that an employer report a pension plan's service cost in the same line item or line items as other compensation costs arising from services rendered by pertinent employees during the period. ASU 2017-07 also requires that other components of net benefit cost be presented in the income statement separately from the service cost component. If a separate line item or items are not used, the line item or items used in the income statement to present the other components of net benefit cost must be disclosed. ASU 2017-07 is effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods, with early adoption permitted at the beginning of an annual period. As our pension plan was frozen as of March 2016, we ceased accruing additional service fee costs at that time. Therefore, the application of this guidance is not anticipated to impact our financial condition, results of operations, or disclosures.

In March 2017, the FASB issued ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs: Premium Amortization on Purchased Callable Debt Securities ("ASU 2017-08"). ASU 2017-08 revises the amortization period for certain callable debt securities held at a premium, requiring the premium to be amortized to the earliest call date. Under current GAAP, entities generally amortize the premium as an adjustment of yield over the contractual life of the instrument. ASU 2017-08 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2018, with early adoption permitted. This ASU does not impact us, as we amortize premium on these callable debt securities to the earliest call date.

In May 2017, the FASB issued ASU 2017-09, Compensation - Stock Compensation: Scope of Modification Accounting ("ASU 2017-09"). ASU 2017-09 provides clarification about which changes to the terms or conditions of a share-based payment award would require the application of modification accounting. ASU 2017-09 is effective for annual and interim periods beginning after December 15, 2017, with early adoption permitted. The adoption of this guidance is not anticipated to impact us, as we currently record modifications in accordance with this ASU.

NOTE 3. Statements of Cash Flows

Supplemental cash flow information was as follows:

	Six Months ended June 30,
($ in thousands)	2017		2016
Cash paid during the period for:
Interest	$	11,963	10,986
Federal income tax	27,000		29,000
Non-cash items:
Exchange of fixed income securities, AFS	1,029		17,702
Corporate actions related to equity securities, AFS1	—		3,032
Assets acquired under capital lease arrangements	278		2,999
Non-cash purchase of property and equipment	—		577

¹Examples of such corporate actions include non-cash acquisitions and stock splits.

Included in "Other assets" on the Consolidated Balance Sheets was $8.1 million at June 30, 2017 and $8.9 million at June 30, 2016 of cash received from the NFIP, which is restricted to pay flood claims under the Write Your Own ("WYO") program.

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NOTE 4. Investments

(a) Information regarding our held-to-maturity ("HTM") fixed income securities as of June 30, 2017 and December 31, 2016 was as follows:

June 30, 2017
($ in thousands)	Amortized Cost		Net  Unrealized Gains  (Losses)		Carrying Value	Unrecognized  Holding Gains	Unrecognized Holding  Losses	Fair Value
Obligations of states and political subdivisions	$	53,734	185		53,919	1,703	—	55,622
Corporate securities	18,714		(119	)	18,595	1,323	—	19,918
Total HTM fixed income securities	$	72,448	66		72,514	3,026	—	75,540

December 31, 2016
($ in thousands)	Amortized Cost		Net  Unrealized Gains  (Losses)		Carrying Value	Unrecognized  Holding Gains	Unrecognized Holding  Losses		Fair Value
Obligations of states and political subdivisions	$	77,466	317		77,783	2,133	—		79,916
Corporate securities	22,711		(143	)	22,568	1,665	(158	)	24,075
Commercial mortgage-backed securities ("CMBS")	1,220		(15	)	1,205	15	—		1,220
Total HTM fixed income securities	$	101,397	159		101,556	3,813	(158	)	105,211

Unrecognized holding gains and losses of HTM securities are not reflected in the Financial Statements, as they represent fair value fluctuations from the later of: (i) the date a security is designated as HTM; or (ii) the date that an other-than-temporary impairment (“OTTI”) charge is recognized on an HTM security, through the date of the balance sheet.

(b) Information regarding our AFS securities as of June 30, 2017 and December 31, 2016 was as follows:

June 30, 2017
($ in thousands)	Cost/ Amortized Cost		Unrealized Gains	Unrealized Losses		Fair Value
AFS fixed income securities:
U.S. government and government agencies	$	66,932	1,103	(32	)	68,003
Foreign government	18,157		557	—		18,714
Obligations of states and political subdivisions	1,360,211		45,641	(1,086	)	1,404,766
Corporate securities	1,782,993		39,041	(524	)	1,821,510
Collateralized loan obligations and other asset-backed securities ("CLO and other ABS")	698,594		4,108	(178	)	702,524
CMBS	277,320		2,128	(243	)	279,205
Residential mortgage-backed securities (“RMBS”)	718,798		6,068	(866	)	724,000
Total AFS fixed income securities	4,923,005		98,646	(2,929	)	5,018,722
AFS equity securities:
Common stock	115,315		30,108	(987	)	144,436
Preferred stock	16,148		1,110	—		17,258
Total AFS equity securities	131,463		31,218	(987	)	161,694
Total AFS securities	$	5,054,468	129,864	(3,916	)	5,180,416

9

December 31, 2016
($ in thousands)	Cost/ Amortized Cost		Unrealized Gains	Unrealized Losses		Fair Value
AFS fixed income securities:
U.S. government and government agencies	$	75,139	2,230	(36	)	77,333
Foreign government	26,559		322	(16	)	26,865
Obligations of states and political subdivisions	1,366,287		18,610	(5,304	)	1,379,593
Corporate securities	1,976,556		27,057	(5,860	)	1,997,753
CLO and other ABS	527,876		1,439	(355	)	528,960
CMBS	256,356		1,514	(1,028	)	256,842
RMBS	524,986		3,006	(2,798	)	525,194
Total AFS fixed income securities	4,753,759		54,178	(15,397	)	4,792,540
AFS equity securities:
Common stock	104,663		26,250	(305	)	130,608
Preferred stock	16,226		274	(355	)	16,145
Total AFS equity securities	120,889		26,524	(660	)	146,753
Total AFS securities	$	4,874,648	80,702	(16,057	)	4,939,293

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 OTTI charge is recognized on an AFS security, through the date of the balance sheet. These unrealized gains and losses are recorded in "Accumulated other comprehensive income (loss)" ("AOCI") on the Consolidated Balance Sheets.

(c) The severity of impairment on securities in an unrealized/unrecognized loss position averaged 1% of amortized cost at both June 30, 2017 and December 31, 2016. Quantitative information regarding unrealized losses on our AFS portfolio is provided below.

June 30, 2017	Less than 12 months				12 months or longer			Total
($ in thousands)	Fair Value		Unrealized Losses1		Fair Value	Unrealized Losses1		Fair Value	Unrealized Losses1
AFS fixed income securities:
U.S. government and government agencies	$	12,670	(32	)	—	—		12,670	(32	)
Obligations of states and political subdivisions	107,387		(1,086	)	—	—		107,387	(1,086	)
Corporate securities	72,991		(517	)	2,531	(7	)	75,522	(524	)
CLO and other ABS	156,406		(178	)	—	—		156,406	(178	)
CMBS	42,671		(243	)	—	—		42,671	(243	)
RMBS	179,293		(860	)	449	(6	)	179,742	(866	)
Total AFS fixed income securities	571,418		(2,916	)	2,980	(13	)	574,398	(2,929	)
AFS equity securities:
Common stock	18,423		(987	)	—	—		18,423	(987	)
Total AFS equity securities	18,423		(987	)	—	—		18,423	(987	)
Total AFS	$	589,841	(3,903	)	2,980	(13	)	592,821	(3,916	)

10

December 31, 2016	Less than 12 months				12 months or longer			Total
($ in thousands)	Fair Value		Unrealized Losses1		Fair Value	Unrealized Losses1		Fair Value	Unrealized Losses1
AFS fixed income securities:
U.S. government and government agencies	$	6,419	(36	)	—	—		6,419	(36	)
Foreign government	13,075		(16	)	—	—		13,075	(16	)
Obligations of states and political subdivisions	306,509		(5,304	)	—	—		306,509	(5,304	)
Corporate securities	462,902		(5,771	)	4,913	(89	)	467,815	(5,860	)
CLO and other ABS	189,795		(354	)	319	(1	)	190,114	(355	)
CMBS	82,492		(1,021	)	1,645	(7	)	84,137	(1,028	)
RMBS	279,480		(2,489	)	8,749	(309	)	288,229	(2,798	)
Total AFS fixed income securities	1,340,672		(14,991	)	15,626	(406	)	1,356,298	(15,397	)
AFS equity securities:
Common stock	11,271		(305	)	—	—		11,271	(305	)
Preferred stock	6,168		(355	)	—	—		6,168	(355	)
Total AFS equity securities	17,439		(660	)	—	—		17,439	(660	)
Total AFS	$	1,358,111	(15,651	)	15,626	(406	)	1,373,737	(16,057	)

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

We do not intend to sell any of the securities in the tables above, nor do we believe we will be required to sell any of these securities. We have also reviewed 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 2016 Annual Report, and have concluded that they are temporarily impaired. 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 June 30, 2017, by contractual maturity, are shown below. Mortgage-backed securities ("MBS") 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 June 30, 2017:

	AFS		HTM
($ in thousands)	Fair Value		Carrying Value	Fair Value
Due in one year or less	$	306,493	34,521	34,898
Due after one year through five years	2,095,055		29,648	31,498
Due after five years through 10 years	2,379,624		8,345	9,144
Due after 10 years	237,550		—	—
Total fixed income securities	$	5,018,722	72,514	75,540

(e) We evaluate the alternative investments and tax credit investments included in our other investments portfolio to determine whether those investments are VIEs and if so, whether consolidation is required. A VIE is an entity that either has equity investors that lack certain essential characteristics of a controlling financial interest or lacks sufficient funds to finance its own activities without financial support provided by other entities. We consider several significant factors in determining if our investments are VIEs and if we are the primary beneficiary, including whether we have: (i) the power to direct activities of the VIE; (ii) the ability to remove the decision maker of the VIE; (iii) the ability to participate in making decisions that are significant to the VIE; and (iv) the obligation to absorb losses and the right to receive benefits that could potentially be significant to the VIE. We have determined that the investments in our other investment portfolio are VIEs, but that we are not the primary beneficiary and therefore, consolidation is not required.

11

The following table summarizes our other investment portfolio by strategy:

Other Investments	June 30, 2017				December 31, 2016
($ in thousands)	Carrying Value		Remaining Commitment	Maximum Exposure to Loss1	Carrying Value	Remaining Commitment	Maximum Exposure to Loss1
Alternative Investments
Private equity	$	46,945	76,027	122,972	41,135	76,774	117,909
Private credit	29,942		57,391	87,333	28,193	40,613	68,806
Real assets	20,783		31,237	52,020	14,486	22,899	37,385
Total alternative investments	97,670		164,655	262,325	83,814	140,286	224,100
Other securities	18,741		—	18,741	18,583	3,400	21,983
Total other investments	$	116,411	164,655	281,066	102,397	143,686	246,083

¹The maximum exposure to loss includes both the carry value of these investments and the related unfunded commitments. In addition, tax credits that have been previously recognized in Other securities are subject to the risk of recapture, which we do not consider significant. 

We do not have a future obligation to fund losses or debts on behalf of the investments above; however, we are contractually committed to make additional investments up to the remaining commitment outlined above. We have not provided any non-contractual financial support at any time during 2017 or 2016.

For a description of our alternative investment strategies, as well as information regarding redemption, restrictions, and fund liquidations, refer to Note 5. “Investments” in Item 8. “Financial Statements and Supplementary Data.” of our 2016 Annual Report.

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 and six-month periods ended March 31 is included in our Second Quarter and Six Months results. This information is as follows:

Income Statement Information	Quarter ended June 30,					Six Months ended June 30,
($ in millions)	2017			2016		2017		2016
Net investment (loss) income	$	(9.9	)	(4.6	)	(62.4	)	37.0
Realized gains	(70.2		)	193.2		(304.3	)	981.1
Net change in unrealized depreciation	1,418.5			(253.9	)	1,890.0		(1,236.5	)
Net gain	$	1,338.4		(65.3	)	1,523.3		(218.4	)
Selective’s insurance subsidiaries’ other investments gain (loss)	$	5.2		(0.6	)	6.8		(1.7	)

(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 June 30, 2017 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 June 30, 2017:

($ in millions)	FHLBI Collateral		FHLBNY Collateral	State and Regulatory Deposits	Total
U.S. government and government agencies	$	3.1	—	23.9	27.0
Obligations of states and political subdivisions	—		—	2.0	2.0
CMBS	3.6		4.8	—	8.4
RMBS	60.6		51.9	—	112.5
Total pledged as collateral	$	67.3	56.7	25.9	149.9

(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 June 30, 2017 or December 31, 2016.

12

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

	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017			2016
Fixed income securities	$	37,668		31,753		$	74,559		63,397
Equity securities	1,419			2,204		2,887			4,434
Short-term investments	377			142		627			301
Other investments	5,231			(611	)	6,834			(1,677	)
Investment expenses	(3,265		)	(2,306	)	(6,058		)	(4,504	)
Net investment income earned	$	41,430		31,182		$	78,849		61,951

(i) The following tables summarize OTTI by asset type for the periods indicated:

Second Quarter 2017	Gross		Included in Other Comprehensive Income ("OCI")			Recognized in Earnings
($ in thousands)
AFS fixed income securities:
U.S. government and government agencies	$	2	—			2
Obligations of states and political subdivisions	239		—			239
Corporate securities	381		—			381
CLO and other ABS	62		—			62
CMBS	220		—			220
RMBS	71		(6		)	77
Total AFS fixed income securities	975		(6		)	981
AFS equity securities:
Common stock	46		—			46
Total AFS equity securities	46		—			46
Other Investments	190		—			190
Total OTTI losses	$	1,211	$	(6	)	$	1,217

Second Quarter 2016	Gross		Included in OCI	Recognized in Earnings
($ in thousands)
AFS fixed income securities:
Corporate securities	$	104	—	104
RMBS	98		10	88
Total AFS fixed income securities	202		10	192
AFS equity securities:
Common stock	357		—	357
Total AFS equity securities	357		—	357
Total OTTI losses	$	559	10	549

Six Months 2017	Gross		Included in Other Comprehensive Income ("OCI")			Recognized in Earnings
($ in thousands)
AFS fixed income securities:
U.S. government and government agencies	$	31	—			31
Obligations of states and political subdivisions	612		—			612
Corporate securities	575		—			575
CLO and other ABS	85		—			85
CMBS	670		—			670
RMBS	1,163		(6		)	1,169
Total AFS fixed income securities	3,136		(6		)	3,142
AFS equity securities:
Common stock	1,360		—			1,360
Total AFS equity securities	1,360		—			1,360
Other Investments	190		—			190
Total OTTI losses	$	4,686	$	(6	)	$	4,692

13

Six Months 2016	Gross		Included in OCI	Recognized in Earnings
($ in thousands)
AFS fixed income securities:
Corporate securities	$	1,077	—	1,077
RMBS	98		10	88
Total AFS fixed income securities	1,175		10	1,165
AFS equity securities:
Common stock	2,974		—	2,974
Preferred stock	3		—	3
Total AFS equity securities	2,977		—	2,977
Total OTTI losses	$	4,152	10	4,142

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 2016 Annual Report.

(j) The components of net realized gains, excluding OTTI charges, for the periods indicated were as follows:

	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
HTM fixed income securities
Gains	$	44		3		44		3
Losses	—			—		(1	)	(1	)
AFS fixed income securities
Gains	2,715			365		6,267		985
Losses	(153		)	(5	)	(1,740	)	(41	)
AFS equity securities
Gains	350			2,171		350		2,501
Losses	—			(220	)	—		(240	)
Other investments
Gains	—			—		480		—
Losses	(5		)	—		(19	)	(4	)
Total net realized gains (excluding OTTI charges)	$	2,951		2,314		5,381		3,203

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 sale of AFS securities were $123.1 million and $88.7 million in Second Quarter 2017 and Second Quarter 2016, respectively, and $723.4 million and $105.9 million in Six Months 2017 and Six Months 2016, respectively. This increase was driven by higher trading volume in our fixed income securities portfolio related to the recent hiring of new external investment managers.

NOTE 5. Indebtedness

Our long-term debt balance has not changed since December 31, 2016. However, on February 28, 2017, Selective Insurance Company of America ("SICA") borrowed $64 million in short-term funds from the FHLBNY at an interest rate of 0.75%. This borrowing was repaid on March 21, 2017.

For detailed information on our indebtedness, see Note 10. "Indebtedness" in Item 8. "Financial Statements and Supplementary Data." of our 2016 Annual Report.

NOTE 6. Fair Value Measurements

Our financial assets are measured at fair value as disclosed on the Consolidated Balance Sheets. The fair values of our long-term debt have improved since December 31, 2016, but not by more than 5% in the aggregate. For a discussion of the fair value and hierarchy of the 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 2016 Annual Report.

14

The following tables provide quantitative disclosures of our financial assets that were measured at fair value at June 30, 2017 and December 31, 2016:

June 30, 2017			Fair Value Measurements Using
($ in thousands)	Assets Measured at Fair Value at 6/30/2017		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	$	68,003	24,828	43,175	—
Foreign government	18,714		—	18,714	—
Obligations of states and political subdivisions	1,404,766		—	1,404,766	—
Corporate securities	1,821,510		—	1,821,510	—
CLO and other ABS	702,524		—	702,524	—
CMBS	279,205		—	279,205	—
RMBS	724,000		—	724,000	—
Total AFS fixed income securities	5,018,722		24,828	4,993,894	—
AFS equity securities:
Common stock	144,436		135,966	—	8,470
Preferred stock	17,258		17,258	—	—
Total AFS equity securities	161,694		153,224	—	8,470
Total AFS securities	5,180,416		178,052	4,993,894	8,470
Short-term investments	133,706		133,706	—	—
Total assets measured at fair value	$	5,314,122	311,758	4,993,894	8,470

December 31, 2016			Fair Value Measurements Using
($ in thousands)	Assets Measured at Fair Value at 12/31/2016		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	$	77,333	27,520	49,813	—
Foreign government	26,865		—	26,865	—
Obligations of states and political subdivisions	1,379,593		—	1,379,593	—
Corporate securities	1,997,753		—	1,997,753	—
CLO and other ABS	528,960		—	528,960	—
CMBS	256,842		—	256,842	—
RMBS	525,194		—	525,194	—
Total AFS fixed income securities	4,792,540		27,520	4,765,020	—
AFS equity securities:
Common stock	130,608		122,932	—	7,676
Preferred stock	16,145		16,145	—	—
Total AFS equity securities	146,753		139,077	—	7,676
Total AFS securities	4,939,293		166,597	4,765,020	7,676
Short-term investments	221,701		221,701	—	—
Total assets measured at fair value	$	5,160,994	388,298	4,765,020	7,676

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

There were no material changes in the fair value of securities measured using Level 3 inputs since December 31, 2016.

15

The following tables provide quantitative information regarding our financial assets and liabilities that were disclosed at fair value at June 30, 2017 and December 31, 2016:

June 30, 2017			Fair Value Measurements Using
($ in thousands)	Assets/ Liabilities Disclosed at Fair Value at 6/30/2017		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	$	55,622	—	55,622	—
Corporate securities	19,918		—	13,960	5,958
Total HTM fixed income securities	$	75,540	—	69,582	5,958
Financial Liabilities
Long-term debt:
7.25% Senior Notes	$	58,690	—	58,690	—
6.70% Senior Notes	112,573		—	112,573	—
5.875% Senior Notes	188,767		188,767	—	—
1.61% borrowings from FHLBNY	24,521		—	24,521	—
1.56% borrowings from FHLBNY	24,462		—	24,462	—
3.03% borrowings from FHLBI	60,837		—	60,837	—
Total long-term debt	$	469,850	188,767	281,083	—

December 31, 2016			Fair Value Measurements Using
($ in thousands)	Assets/ Liabilities Disclosed at Fair Value at 12/31/2016		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	$	79,916	—	79,916	—
Corporate securities	24,075		—	16,565	7,510
CMBS	1,220		—	1,220	—
Total HTM fixed income securities	$	105,211	—	97,701	7,510
Financial Liabilities
Long-term debt:
7.25% Senior Notes	$	56,148	—	56,148	—
6.70% Senior Notes	108,333		—	108,333	—
5.875% Senior Notes	176,860		176,860	—	—
1.61% borrowings from FHLBNY	24,286		—	24,286	—
1.56% borrowings from FHLBNY	24,219		—	24,219	—
3.03% borrowings from FHLBI	59,313		—	59,313	—
Total long-term debt	$	449,159	176,860	272,299	—

16

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 2016 Annual Report.

	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Premiums written:
Direct	$	706,408		665,862		1,390,228		1,312,140
Assumed	6,488			7,788		12,179		14,108
Ceded	(99,082		)	(95,510	)	(189,889	)	(182,749	)
Net	$	613,814		578,140		1,212,518		1,143,499
Premiums earned:
Direct	$	654,588		612,406		1,301,316		1,219,067
Assumed	6,063			7,171		11,842		13,441
Ceded	(92,621		)	(87,645	)	(184,274	)	(178,118	)
Net	$	568,030		531,932		1,128,884		1,054,390
Loss and loss expense incurred:
Direct	$	389,550		362,064		731,672		723,703
Assumed	7,766			6,140		12,203		12,495
Ceded	(55,757		)	(69,725	)	(84,844	)	(140,575	)
Net	$	341,559		298,479		659,031		595,623

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 June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Ceded premiums written	$	(63,808	)	(63,906	)	(120,142	)	(117,154	)
Ceded premiums earned	(57,655		)	(56,667	)	(114,932	)	(113,481	)
Ceded loss and loss expense incurred	(15,140		)	(24,261	)	(21,681	)	(64,979	)

NOTE 8. Reserves for Losses and Loss Expenses

The table below provides a roll forward of reserves for losses and loss expenses for beginning and ending reserve balances:

	Six Months ended June 30,
($ in thousands)	2017			2016
Gross reserves for losses and loss expenses, at beginning of year	$	3,691,719		3,517,728
Less: reinsurance recoverable on unpaid losses and loss expenses, at beginning of year	611,200			551,019
Net reserves for losses and loss expenses, at beginning of year	3,080,519			2,966,709
Incurred losses and loss expenses for claims occurring in the:
Current year	684,877			624,159
Prior years	(25,846		)	(28,536	)
Total incurred losses and loss expenses	659,031			595,623
Paid losses and loss expenses for claims occurring in the:
Current year	171,724			146,849
Prior years	425,521			402,255
Total paid losses and loss expenses	597,245			549,104
Net reserves for losses and loss expenses, at end of period	3,142,305			3,013,228
Add: Reinsurance recoverable on unpaid losses and loss expenses, at end of period	588,916			576,941
Gross reserves for losses and loss expenses at end of period	$	3,731,221		3,590,169

Prior year development in Six Months 2017 of $25.8 million was primarily driven by favorable prior year casualty reserve development of $37.4 million in our general liability line of business and $15.3 million in our workers compensation line of business. This was partially offset by unfavorable casualty reserve development of $21.0 million in our commercial automobile line of business and $4.0 million in our personal automobile line of business.

17

Prior year development in Six Months 2016 of $28.5 million was primarily due to favorable casualty reserve development of $22.0 million in our general liability line of business and $21.0 million in our workers compensation line of business. This was partially offset by unfavorable casualty reserve development of $13.0 million in our commercial automobile line of business and $3.0 million in our E&S segment.

NOTE 9. Segment Information

The disaggregated results of our four reportable segments are used by senior management to manage our operations. These reportable segments are evaluated as follows:

• Our Standard Commercial Lines, Standard Personal Lines, and Excess and Surplus ("E&S") Lines are evaluated based on statutory underwriting results (net premiums earned, incurred losses and loss expenses, policyholder dividends, policy acquisition costs, and other underwriting expenses), and statutory combined ratios.

• Our Investments segment is evaluated based on after-tax net investment income and net realized gains and losses.

In computing the results of each segment, we do not make adjustments for interest expense or net general corporate expenses; however, we do partially allocate taxes to various segments. Furthermore, 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 gains on investments in the case of the Investments segment) and pre-tax income for the individual segments:

Revenue by Segment	Quarter ended June 30,			Six Months ended June 30,
($ in thousands)	2017		2016	2017	2016
Standard Commercial Lines:
Net premiums earned:
Commercial automobile	$	108,316	98,896	215,445	194,315
Workers compensation	79,460		75,251	158,786	151,251
General liability	141,503		129,283	281,487	257,368
Commercial property	78,052		73,591	154,443	143,769
Businessowners’ policies	24,989		24,651	49,834	48,555
Bonds	6,986		5,665	13,484	11,129
Other	4,288		3,940	8,529	7,779
Miscellaneous income	3,016		3,567	5,876	4,257
Total Standard Commercial Lines revenue	446,610		414,844	887,884	818,423
Standard Personal Lines:
Net premiums earned:
Personal automobile	37,663		35,881	74,613	71,661
Homeowners	32,467		33,411	65,167	66,311
Other	1,542		1,532	3,093	3,057
Miscellaneous income	275		301	656	561
Total Standard Personal Lines revenue	71,947		71,125	143,529	141,590
E&S Lines:
Net premiums earned:
Commercial liability	39,054		36,940	76,966	73,796
Commercial property	13,710		12,891	27,037	25,399
Miscellaneous income	—		—	—	1
Total E&S Lines revenue	52,764		49,831	104,003	99,196
Investments:
Net investment income	41,430		31,182	78,849	61,951
Net realized investment gains (losses)	1,734		1,765	689	(939	)
Total Investments revenue	43,164		32,947	79,538	61,012
Total revenues	$	614,485	568,747	1,214,954	1,120,221

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Income Before Federal Income Tax	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Standard Commercial Lines:
Underwriting gain	$	34,759		40,173		77,305		71,105
GAAP combined ratio	92.2		%	90.2		91.2		91.3
Statutory combined ratio	90.6			88.6		89.5		89.1
Standard Personal Lines:
Underwriting (loss) gain	$	(5,768	)	6,125		(662	)	14,730
GAAP combined ratio	108.0		%	91.4		100.5		89.6
Statutory combined ratio	105.9			89.9		99.8		90.1
E&S Lines:
Underwriting gain (loss)	$	1,319		(2,521	)	2,889		(1,103	)
GAAP combined ratio	97.5		%	105.1		97.2		101.1
Statutory combined ratio	97.0			102.7		96.5		100.6
Investments:
Net investment income	$	41,430		31,182		78,849		61,951
Net realized investment losses	1,734			1,765		689		(939	)
Total investment income, before federal income tax	43,164			32,947		79,538		61,012
Tax on investment income	11,734			8,275		21,336		14,538
Total investment income, after federal income tax	$	31,430		24,672		58,202		46,474

Reconciliation of Segment Results to Income Before Federal Income Tax	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Underwriting gain (loss), before federal income tax
Standard Commercial Lines	$	34,759		40,173		77,305		71,105
Standard Personal Lines	(5,768		)	6,125		(662	)	14,730
E&S Lines	1,319			(2,521	)	2,889		(1,103	)
Investment income, before federal income tax	43,164			32,947		79,538		61,012
Total all segments	73,474			76,724		159,070		145,744
Interest expense	(6,081		)	(5,620	)	(12,187	)	(11,226	)
General corporate and other expenses	(8,464		)	(8,793	)	(20,380	)	(20,332	)
Income, before federal income tax	$	58,929		62,311		126,503		114,186

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 2016 Annual Report.

The following tables provide information regarding the Pension Plan:

	Pension Plan Quarter ended June 30,					Pension Plan Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Net Periodic Benefit Cost:
Service cost	$	—		—		—		1,606
Interest cost	3,110			3,101		6,221		6,203
Expected return on plan assets	(4,855		)	(3,988	)	(9,709	)	(7,976	)
Amortization of unrecognized net actuarial loss	482			1,481		963		2,961
Total net periodic cost	$	(1,263	)	594		(2,525	)	2,794

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	Pension Plan Six Months ended June 30,
	2017		2016
Weighted-Average Expense Assumptions:
Discount rate	4.41	%	4.69	%
Effective interest rate for calculation of service cost	n/a		4.52
Effective interest rate for calculation of interest cost	3.83		4.02
Expected return on plan assets	6.24		6.37
Rate of compensation increase	n/a		4.00

NOTE 11. Comprehensive Income

The components of comprehensive income, both gross and net of tax, for Second Quarter and Six Months2017 and 2016 are as follows:

Second Quarter 2017
($ in thousands)	Gross			Tax		Net
Net income	$	58,929		17,503		41,426
Components of OCI:
Unrealized gains on investment securities:
Unrealized holding gains during period	35,887			12,561		23,326
Non-credit portion of OTTI recognized in OCI	6			2		4
Amounts reclassified into net income:
HTM securities	(43		)	(15	)	(28	)
Realized gains on AFS securities	(1,885		)	(660	)	(1,225	)
Total unrealized gains on investment securities	33,965			11,888		22,077
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	508			178		330
Total defined benefit pension and post-retirement plans	508			178		330
Other comprehensive income	34,473			12,066		22,407
Comprehensive income	$	93,402		29,569		63,833

Second Quarter 2016
($ in thousands)	Gross			Tax		Net
Net income	$	62,311		18,710		43,601
Components of OCI:
Unrealized gains on investment securities:
Unrealized holding gains during period	55,675			19,487		36,188
Non-credit portion of OTTI recognized in OCI	(10		)	(4	)	(6	)
Amounts reclassified into net income:
HTM securities	(19		)	(7	)	(12	)
Realized gains on AFS securities	(1,762		)	(617	)	(1,145	)
Total unrealized gains on investment securities	53,884			18,859		35,025
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	1,517			532		985
Total defined benefit pension and post-retirement plans	1,517			532		985
Other comprehensive income	55,401			19,391		36,010
Comprehensive income	$	117,712		38,101		79,611

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Six Months 2017
($ in thousands)	Gross			Tax		Net
Net income	$	126,503		34,637		91,866
Components of OCI:
Unrealized gains on investment securities:
Unrealized holding gains during period	61,672			21,585		40,087
Non-credit portion of OTTI recognized in OCI	6			2		4
Amounts reclassified into net income:
HTM securities	(92		)	(32	)	(60	)
Realized gains on AFS securities	(375		)	(131	)	(244	)
Total unrealized gains on investment securities	61,211			21,424		39,787
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	1,015			355		660
Total defined benefit pension and post-retirement plans	1,015			355		660
Other comprehensive income	62,226			21,779		40,447
Comprehensive income	$	188,729		56,416		132,313

Six Months 2016
($ in thousands)	Gross			Tax		Net
Net income	$	114,186		33,553		80,633
Components of OCI:
Unrealized gains on investment securities:
Unrealized holding gains during period	121,412			42,495		78,917
Non-credit portion of OTTI recognized in OCI	(10		)	(4	)	(6	)
Amounts reclassified into net income:
HTM securities	(91		)	(32	)	(59	)
Realized losses on AFS securities	937			328		609
Total unrealized gains on investment securities	122,248			42,787		79,461
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	3,033			1,062		1,971
Total defined benefit pension and post-retirement plans	3,033			1,062		1,971
Other comprehensive income	125,281			43,849		81,432
Comprehensive income	$	239,467		77,402		162,065

The balances of, and changes in, each component of AOCI (net of taxes) as of June 30, 2017 were as follows:

June 30, 2017										Defined Benefit Pension and Post-Retirement Plans
	Net Unrealized Gain on Investment Securities											Total AOCI
($ in thousands)	OTTI Related			HTM Related		All Other		Investments Subtotal
Balance, December 31, 2016	$	(150	)	102		42,170		42,122		(58,072	)	(15,950	)
OCI before reclassifications	4			—		40,087		40,091		—		40,091
Amounts reclassified from AOCI	—			(60	)	(244	)	(304	)	660		356
Net current period OCI	4			(60	)	39,843		39,787		660		40,447
Balance, June 30, 2017	$	(146	)	42		82,013		81,909		(57,412	)	24,497

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The reclassifications out of AOCI were as follows:

	Quarter ended June 30,					Six Months ended June 30,				Affected Line Item in the Unaudited Consolidated Statement of Income
($ in thousands)	2017			2016		2017		2016
HTM related
Unrealized losses on HTM disposals	17			60		30		88		Net realized gains (losses)
Amortization of net unrealized gains on HTM securities	(60		)	(79	)	(122	)	(179	)	Net investment income earned
	(43		)	(19	)	(92	)	(91	)	Income before federal income tax
	15			7		32		32		Total federal income tax expense
	(28		)	(12	)	(60	)	(59	)	Net income
Realized (gains) losses on AFS and OTTI
Realized (gains) losses on AFS disposals and OTTI	(1,885		)	(1,762	)	(375	)	937		Net realized gains (losses)
	(1,885		)	(1,762	)	(375	)	937		Income before federal income tax
	660			617		131		(328	)	Total federal income tax expense
	(1,225		)	(1,145	)	(244	)	609		Net income
Defined benefit pension and post-retirement life plans
Net actuarial loss	111			329		221		658		Losses and loss expenses incurred
	397			1,188		794		2,375		Policy acquisition costs
Total defined benefit pension and post-retirement life	508			1,517		1,015		3,033		Income before federal income tax
	(178		)	(532	)	(355	)	(1,062	)	Total federal income tax expense
	330			985		660		1,971		Net income
Total reclassifications for the period	$	(923	)	(172	)	356		2,521		Net income

NOTE 12. Related Party Transactions

BlackRock, Inc., a leading publicly traded investment management firm (“BlackRock”), has purchased our common shares in the ordinary course of its investment business and has previously filed Schedules 13G/A with the SEC. On April 10, 2017, BlackRock filed a Schedule 13G/A reporting beneficial ownership as of March 31, 2017, of 12.7% of our common stock. In connection with purchasing our common shares, BlackRock filed the necessary filings with insurance regulatory authorities. On the basis of those filings, BlackRock is deemed not to be a controlling person for the purposes of applicable insurance law.

We are required to disclose related party information for our transactions with BlackRock. BlackRock is highly regulated, serves its clients as a fiduciary, and has a diverse platform of active (alpha) and index (beta) investment strategies across asset classes that enables it to tailor investment outcomes and asset allocation solutions for clients. BlackRock also offers the BlackRock Solutions^® investment and risk management technology platform, Aladdin^®, risk analytics, advisory and technology services and solutions to a broad base of institutional and wealth management investors. In Second Quarter 2017 and Six Months 2017, we incurred BlackRock-related expenses of $0.5 million and $1.0 million for services rendered, respectively. No material expenses were incurred with BlackRock in Second Quarter 2016 and Six Months 2016. Amounts payable for such services at June 30, 2017 and December 31, 2016, were $0.9 million and $0.4 million, respectively. All contracts with BlackRock were consummated in the ordinary course of business on an arm's-length basis.

We have no additional material transactions with related parties other than those disclosed in Note 16. "Related Party Transactions" included in Item 8. "Financial Statements and Supplementary Data." of our 2016 Annual Report.

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NOTE 13. Litigation

In the ordinary course of conducting business, we are named as defendants in various legal proceedings. Most of these proceedings are claims litigation involving our ten insurance subsidiaries ("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 losses and loss expense reserves. We expect that any potential ultimate liability in such ordinary course claims litigation will not be material to our consolidated financial condition, results of operations, or cash flows after consideration of provisions made for potential losses and costs of defense.

From time to time, our Insurance Subsidiaries also are named as defendants in other legal actions, some of which assert claims for substantial amounts. These actions include, among others, putative class actions seeking certification of a state or national class. Such putative class actions have alleged, for example, improper reimbursement of medical providers paid under workers compensation and personal and commercial automobile insurance policies. Similarly, our Insurance Subsidiaries are also named from time-to-time in individual actions seeking extra-contractual damages, punitive damages, or penalties, some of which allege bad faith in the handling of insurance claims. We believe that we have valid defenses to these cases. We expect that any potential ultimate liability in any such lawsuit will not be material to our consolidated financial condition, after consideration of provisions made for estimated losses. Nonetheless, given the inherent unpredictability of litigation and the large or indeterminate amounts sought in certain of these actions, an adverse outcome in certain matters could possibly have a material adverse effect on our consolidated results of operations or cash flows in particular quarterly or annual periods.

As of June 30, 2017, we do not believe the Company was involved in any legal action that could have a material adverse effect on our consolidated financial condition, results of operations, or cash flows.

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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.

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, 2016 ("2016 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 ("MUSIC"). 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 the consolidated financial statements in our 2016 Annual Report filed with the U.S. Securities and Exchange Commission ("SEC").

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

• Critical Accounting Policies and Estimates;

• Financial Highlights of Results for the second quarters ended June 30, 2017 (“Second Quarter 2017”) and June 30, 2016 (“Second Quarter 2016”) and the six-month periods ended June 30, 2017 ("Six Months 2017") and June 30, 2016 ("Six Months 2016");

• 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.

24

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 expenses; (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 45 of our 2016 Annual Report.

Financial Highlights of Results for Second Quarter and Six Months2017 and Second Quarter and Six Months2016¹

($ and shares in thousands, except per share amounts)	Quarter ended June 30,				Change % or Points			Six Months ended June 30,				Change % or Points
	2017			2016				2017			2016
Generally Accepted Accounting Principles ("GAAP") measures:
Revenues	$	614,485		568,747	8		%	$	1,214,954		1,120,221	8		%
After-tax net investment income	30,303			23,525	29			57,754			47,085	23
Pre-tax net income	58,929			62,311	(5	)		126,503			114,186	11
Net income	41,426			43,601	(5	)		91,866			80,633	14
Diluted net income per share	0.70			0.74	(5	)		1.55			1.38	12
Diluted weighted-average outstanding shares	59,222			58,598	1			59,185			58,552	1
GAAP combined ratio	94.7		%	91.8	2.9		pts	93.0		%	92.0	1.0		pts
Statutory combined ratio	93.1			90.1	3.0			91.4			90.4	1.0
Invested assets per dollar of stockholders' equity	$	3.33		3.39	(2	)	%	$	3.33		3.39	(2	)	%
After-tax yield on investments	2.2		%	1.8	0.4		pts	2.1		%	1.8	0.3		pts
Annualized return on average equity ("ROE")	10.2			11.5	(1.3	)		11.5			10.9	0.6
Non-GAAP measures:
Operating income2	$	40,299		42,454	(5	)	%	$	91,418		81,244	13		%
Diluted operating income per share2	0.68			0.72	(6	)		1.54			1.39	11
Annualized operating ROE2	9.9		%	11.2	(1.3	)	pts	11.5		%	11.0	0.5		pts

¹  Refer to the Glossary of Terms attached to our 2016 Annual Report as Exhibit 99.1 for definitions of terms used in this Form 10-Q.

²  Operating income is used as an important financial measure by us, analysts, and investors, because the realization of investment gains and losses on sales in any given period is largely discretionary as to timing. In addition, these realized investment gains and losses, as well as OTTI that are charged to earnings and the results of discontinued operations, could distort the analysis of trends.

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

Reconciliation of net income to operating income	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Net income	$	41,426		43,601		91,866		80,633
Exclude: Net realized (gains) losses	(1,734		)	(1,765	)	(689	)	939
Exclude: Tax on net realized (gains) losses	607			618		241		(328	)
Operating income	$	40,299		42,454		91,418		81,244

Reconciliation of net income per share to operating income per share	Quarter ended June 30,					Six Months ended June 30,
	2017			2016		2017		2016
Diluted net income per share	$	0.70		0.74		1.55		1.38
Exclude: Net realized (gains) losses per share	(0.03		)	(0.03	)	(0.01	)	0.02
Exclude: Tax on net realized (gains) losses per share	0.01			0.01		—		(0.01	)
Diluted operating income per share	$	0.68		0.72		1.54		1.39

Reconciliation of annualized ROE to annualized operating ROE	Quarter ended June 30,				Six Months ended June 30,
	2017		2016		2017		2016
Annualized ROE	10.2	%	11.5		11.5		10.9
Exclude: Net realized (gains) losses	(0.4	)	(0.5	)	(0.1	)	0.1
Exclude: Tax on net realized (gains) losses	0.1		0.2		0.1		—
Annualized operating ROE	9.9	%	11.2		11.5		11.0

25

Our Six Months 2017 results continue to reflect our hard work to drive renewal pure price increases within our Standard Commercial and Personal Lines segments as well as our E&S segment, generate new business, and improve the underlying profitability of our book of business through various underwriting and claims initiatives. Our net premiums written ("NPW") growth of 6% in Six Months 2017 was driven by our strong franchise value with our "ivy league" distribution partners. Over the past eight years, our Standard Commercial Lines renewal pure price increases have cumulatively outperformed the Willis Towers Watson Commercial Lines Pricing (or CLIPs) survey by approximately 1,800 basis points, while maintaining high retention rates. In addition, NPW growth was aided by the appointment of 46 retail agents in 2016 and 10 retail agents in Six Months 2017, which is exclusive of 25 agents that have been appointed in our expansion states. These expansion state agents will begin generating premium for us in the second half of 2017.

In addition to the cumulative pure renewal price increases we have achieved over the past several years, we have benefited from underwriting and claims process enhancements, as well as a shift in our business mix towards higher quality accounts. For example, our workers compensation book of business, which represents approximately 20% of our Standard Commercial Lines business, continues to benefit from the steps we have taken in recent years to increase premium rates and improve the business mix by shifting towards lower hazard and smaller accounts from higher hazard and larger accounts. Additionally, claims initiatives, such as having an increased focus on reducing workers compensation medical costs through more favorable Preferred Provider Organization ("PPO") contracts and greater PPO penetration, have helped improve profitability of this line. The workers compensation statutory combined ratio was a profitable 86.9% in Six Months 2017. Our E&S segment has also seen some improvement in underwriting results as we have continued to deploy our corporate claims practices into this smaller operation; although we have not yet met our financial targets for this segment. For a full discussion of the claims initiatives that we have deployed, refer to the “Reserves for Loss and Loss Expenses” section within Critical Accounting Policies in Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations” of our 2016 Annual Report.

After-tax net investment income grew 23% in Six Months 2017 compared to Six Months 2016, driven by higher yields on our fixed income portfolio and improved returns on our alternative investments. In 2016, we determined that a more active management approach to our investment portfolio was necessary to maximize the risk-adjusted after-tax income and total return of the portfolio in an investment environment of low interest rates, while maintaining a similar level of credit quality and duration risk. We have increased our long-term target risk asset allocation and modestly increased our exposure to non-investment grade fixed income securities, private equity investments, and private credit strategies to further diversify our allocation within risk assets. Our risk assets, which include public equities, non-investment grade fixed income securities, private equity investments, and other limited partnership private investments, represented 7% of our total invested assets at June 30, 2017 and may increase to approximately 10% over time.

The improvements to our underwriting profitability and the more active management of our investment portfolio contributed to our long-term goal of generating an operating ROE that is approximately 300 basis points in excess of our weighted average cost of capital over time. Our annualized operating ROE increased in Six Months 2017 to 11.5%, compared to 11.0% in Six Months 2016, mainly due to the increase in investment income mentioned above. Our annualized ROE and operating ROE contributions by component are as follows:

ROE	Quarter ended June 30,				Six Months ended June 30,
	2017		2016		2017		2016
Insurance segments	4.9	%	7.5		6.5	%	7.5
Investment income1	7.5		6.2		7.3		6.4
Other	(2.5	)	(2.5	)	(2.3	)	(2.9	)
Net realized gains (losses)1, net of tax at 35%	0.3		0.3		—		(0.1	)
Annualized ROE	10.2		11.5		11.5		10.9
Exclude: Net realized gains (losses)1, net of tax at 35%	(0.3	)	(0.3	)	—		0.1
Annualized operating ROE	9.9	%	11.2		11.5	%	11.0
Weighted average cost of capital, as of the prior year-end	8.5	%	8.7		8.5	%	8.7

¹ Investment segment results are the combination of "Net investment income earned" and "Net realized losses".

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Insurance Segments

The key metric in understanding our insurance segments’ contribution to annualized operating ROE is the GAAP combined ratio. The following table provides a quantitative foundation for analyzing this ratio:

All Lines	Quarter ended June 30,				Change % or Points			Six Months ended June 30,				Change % or Points
($ in thousands)	2017			2016				2017			2016
GAAP Insurance Operations Results:
NPW	$	613,814		578,140	6		%	$	1,212,518		1,143,499	6		%
Net premiums earned (“NPE”)	568,030			531,932	7			1,128,884			1,054,390	7
Less:
Losses and loss expenses incurred	341,559			298,479	14			659,031			595,623	11
Net underwriting expenses incurred	194,237			188,058	3			388,494			370,764	5
Dividends to policyholders	1,924			1,618	19			1,827			3,271	(44	)
Underwriting gain	$	30,310		43,777	(31	)	%	$	79,532		84,732	(6	)	%
GAAP Ratios:
Loss and loss expense ratio	60.2		%	56.1	4.1		pts	58.4		%	56.5	1.9		pts
Underwriting expense ratio	34.2			35.4	(1.2	)		34.4			35.2	(0.8	)
Dividends to policyholders ratio	0.3			0.3	—			0.2			0.3	(0.1	)
Combined ratio	94.7			91.8	2.9			93.0			92.0	1.0
Statutory Ratios:
Loss and loss expense ratio	60.0			56.0	4.0			58.2			56.4	1.8
Underwriting expense ratio	32.8			33.8	(1.0	)		33.0			33.7	(0.7	)
Dividends to policyholders ratio	0.3			0.3	—			0.2			0.3	(0.1	)
Combined ratio	93.1		%	90.1	3.0		pts	91.4		%	90.4	1.0		pts

The GAAP combined ratio increased by 2.9 points in Second Quarter 2017 and 1.0 point in Six Months 2017 compared to the same periods last year, driven by:

	Second Quarter 2017						Second Quarter 2016
($ in millions)	Losses and Loss Expenses Incurred			Impact on Loss and Loss Expense Ratio			Losses and Loss Expenses Incurred			Impact on Loss and Loss Expense Ratio			Change in Ratio
Catastrophe losses	$	29.3		5.2		pts	$	8.4		1.6		pts	3.6		pts
Non-catastrophe property losses	73.3			12.9			64.3			12.1			0.8
Favorable prior year casualty reserve development	(14.3		)	(2.5	)		(10.0		)	(1.9	)		(0.6	)
Total	88.3			15.6			62.7			11.8			3.8

	Six Months 2017						Six Months 2016
($ in millions)	Losses and Loss Expenses Incurred			Impact on Loss and Loss Expense Ratio			Losses and Loss Expenses Incurred			Impact on Loss and Loss Expense Ratio			Change in Ratio
Catastrophe losses	$	41.5		3.7		pts	$	22.8		2.2		pts	1.5	pts
Non-catastrophe property losses	144.7			12.8			130.8			12.4			0.4
Favorable prior year casualty reserve development	(28.7		)	(2.5	)		(27.0		)	(2.6	)		0.1
Total	157.5			14.0			126.6			12.0			2.0

The Second Quarter 2017 catastrophe losses included $11.9 million of development, or 2.1 points, from prior period storms. The most significant of these were three hail storms that occurred in March 2017 that added $8.8 million, or 1.5 points, to Second Quarter 2017 losses.

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

(Favorable)/Unfavorable Prior Year Casualty Reserve Development	Quarter ended June 30,						Six Months ended June 30,
($ in millions)	2017				2016		2017		2016
General liability	$	(15.0	)		(11.0	)	(37.4	)	(22.0	)
Commercial automobile	15.0				8.0		21.0		13.0
Workers compensation	(15.3		)		(9.0	)	(15.3	)	(21.0	)
Bonds	(2.0		)		—		(2.0	)	—
Total Standard Commercial Lines	(17.3		)		(12.0	)	(33.7	)	(30.0	)
Homeowners	1.0				—		1.0		—
Personal automobile	2.0				—		4.0		—
Total Standard Personal Lines	3.0				—		5.0		—
E&S	—				2.0		—		3.0
Total (favorable) prior year casualty reserve development	$	(14.3	)		(10.0	)	(28.7	)	(27.0	)
(Favorable) impact on loss ratio	(2.5		)	pts	(1.9	)	(2.5	)	(2.6	)

For a qualitative discussion of this reserve development, please refer to the respective insurance segment section below in

"Results of Operations and Related Information by Segment."

Improvements in the GAAP underwriting expense ratio in Second Quarter 2017 of 1.2 points and Six Months 2017 of 0.8 points compared to the same periods last year included the following:

• A 0.3-point and 0.2-point decrease in supplemental commissions to our distribution partners in Second Quarter 2017 and Six Months 2017, respectively; and

• A 0.3-point and 0.4-point decrease in pension expense in Second Quarter 2017 and Six Months 2017, respectively. As our pension plan ceased accruing benefits on March 31, 2016, we extended the amortization period for the net actuarial loss from the average remaining service life of active participants to the average remaining life expectancy of plan participants. This reduced amortization, coupled with interest costs in the quarter, did not fully offset the expected return on our pension assets, thereby creating the benefit that reduced our overall expense ratio. For additional information on our pension plan, refer to Note 10. "Retirement Plans" in Item 1. "Financial Statements." of this Form 10-Q.

Investments Segment

In total, our investment segment contributed 7.8 points to our overall annualized ROE in Second Quarter 2017 and 7.3 points in Six Months 2017, compared to 6.5 points and 6.3 points in Second Quarter and Six Months 2016, respectively. These increases were driven by improved yields on our fixed income securities portfolio. Additionally, our alternative investment portfolio reported pre-tax income of $5.2 million in Second Quarter 2017 and $6.8 million in Six Months 2017 compared to pre-tax losses of $0.6 million and $1.7 million in Second Quarter and Six Months 2016, respectively, which were negatively impacted by the energy sector in the prior year.

Other

Our other expenses, which are primarily comprised of expenses at the holding company level, reduced our overall annualized ROE by 2.5 points in both Second Quarter 2017 and Second Quarter 2016 and 2.3 points in Six Months 2017 compared to 2.9 points in Six Months 2016. The year-to-date variance was driven primarily by the tax effects of share-based compensation, which benefited our overall annualized ROE by 0.4 points in Six Months 2017. We do not expect this tax benefit to be replicated throughout the remainder of 2017. We had expected expense reductions and increased stability related to our share-based payment awards beginning in 2017, as we have restructured our 2017 awards to be more aligned with grant date fair value expense treatment and lowered the allocation to awards that require fair value adjustments subsequent to grant date. However, the 16% increase in our stock price during Six Months 2017 has resulted in fair value adjustments to our outstanding awards during Six Months 2017 that have offset the savings associated with the structural changes made to the awards granted in 2017.

For additional information on the tax effects of share-based compensation, refer to Note 2. "Adoption of Accounting Pronouncements" in Item 1. "Financial Statements." of this Form 10-Q.

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Outlook

In 2017, we continue to focus on seeking out additional growth opportunities in our insurance operations while achieving rate and working towards our profit targets. We have been able to achieve NPW growth that has exceeded the industry’s growth rate, while at the same time generating solid underwriting margins. In addition, we have about a 1.3% standard commercial lines market share in the 22 states in which we operate and our long-term goal is to increase this market share to approximately 3%. By offering our distribution partners superior technology solutions and customer experience, we are targeting a 12% share of the standard commercial lines business within our independent agencies, which we refer to as our "share of wallet." As of June 30, 2017, our share of wallet with agencies with which we have an established relationship was 8%. We are also seeking to increase our agency appointments over time to represent a 25% market share of the states in which we are fully operational, from our current 18% share. We believe our relationships with our distribution partners are among the strongest in the industry and underpin our success. During Six Months 2017, we appointed 35 of the 85 new agents we are planning for this year, net of agency terminations.

Our expansion plans are well on track for Arizona and New Hampshire. We have appointed a total of 25 agents in these states, with appointments in each state controlling about 25% of that state's available commercial lines premium. We began quoting business during Second Quarter 2017, with policies being effective on or after July 1, 2017. Our approach to entering these states has been consistent with our agent franchise business model, which is predicated around our field-based underwriting, claims, and customer service.

In our Investments segment, we generated after-tax net investment income of $57.8 million in Six Months 2017 and are on track to meet our full-year guidance outlined below. Our challenge in 2017 is navigating the increased market volatility that may accompany uncertainty regarding fiscal and monetary policy changes. For instance, the potential impact of limiting or eliminating tax-advantage municipal bond interest may be significant to the returns of our municipal bond portfolio. Likewise, a reduction in the corporate tax rate or a border-adjustment tax may have significant repercussions in the marketplace. Weighing these risks when seeking new opportunities, and managing the risks for existing positions and sectors in the portfolio, will be a key focus throughout the remainder of the year.

In summary, we are positioning ourselves for a more competitive environment with a focus on generating adequate returns for our shareholders. We are preparing ourselves for changes in a period of heightened uncertainty surrounding interest rates, tax law changes, legislative changes, and inflation. We also have a number of internal strategic initiatives in place to enhance our technological offerings to our agents while improving the overall customer experience.

After two quarters of better than expected results, we are revising our full-year expectations to the following:

• A statutory combined ratio, excluding catastrophe losses, of 89.5%, an improvement of 100 basis points from our original guidance. This assumes no additional prior year casualty reserve development;

• Catastrophe losses of 3.5 points;

• After-tax investment income of $113 million, up from our original guidance of $110 million; and

• Weighted average shares of 59.2 million.

29

Results of Operations and Related Information by Segment

Standard Commercial Lines

	Quarter ended June 30,				Change % or Points			Six Months ended June 30,				Change % or Points
($ in thousands)	2017			2016				2017			2016
GAAP Insurance Operations Results:
NPW	$	478,917		449,008	7		%	$	962,465		904,071	6		%
NPE	443,594			411,277	8			882,008			814,166	8
Less:
Losses and loss expenses incurred	252,876			221,618	14			494,440			444,968	11
Net underwriting expenses incurred	154,035			147,868	4			308,436			294,822	5
Dividends to policyholders	1,924			1,618	19			1,827			3,271	(44	)
Underwriting gain	$	34,759		40,173	(13	)	%	$	77,305		71,105	9		%
GAAP Ratios:
Loss and loss expense ratio	57.1		%	53.9	3.2		pts	56.0		%	54.7	1.3		pts
Underwriting expense ratio	34.7			35.9	(1.2	)		35.0			36.2	(1.2	)
Dividends to policyholders ratio	0.4			0.4	—			0.2			0.4	(0.2	)
Combined ratio	92.2			90.2	2.0			91.2			91.3	(0.1	)
Statutory Ratios:
Loss and loss expense ratio	56.9			53.8	3.1			56.0			54.5	1.5
Underwriting expense ratio	33.3			34.4	(1.1	)		33.3			34.2	(0.9	)
Dividends to policyholders ratio	0.4			0.4	—			0.2			0.4	(0.2	)
Combined ratio	90.6		%	88.6	2.0		pts	89.5		%	89.1	0.4		pts

The increases in NPW in Second Quarter and Six Months2017 compared to Second Quarter and Six Months2016 were driven by: (i) direct new business; (ii) renewal pure price increases; and (iii) solid retention.

	Quarter ended June 30,				Six Months ended June 30,
($ in millions)	2017			2016	2017			2016
Retention	83		%	83	83		%	83
Renewal pure price increases	3.1			2.6	3.1			2.7
Direct new business	$	98.0		95.5	$	187.5		183.2

The NPE increases in Second Quarter and Six Months2017 compared to Second Quarter and Six Months2016 were consistent with the fluctuation in NPW for the twelve-month period ended June 30, 2017 compared with the twelve-month period ended June 30, 2016.

The GAAP loss and loss expense ratio increased 3.2 points in Second Quarter 2017 compared to Second Quarter 2016 and 1.3 points in Six Months2017 compared to Six Months2016, reflecting the following items, which were partially offset by underwriting improvements, claims initiatives, and earned rate that outpaced loss costs:

	Second Quarter 2017						Second Quarter 2016
($ in millions)	Losses and Loss Expenses Incurred			Impact on Loss and Loss Expense Ratio			Losses and Loss Expenses Incurred			Impact on Loss and Loss Expense Ratio			Change in Ratio
Catastrophe losses	$	17.0		3.8		pts	$	3.6		0.9		pts	2.9		pts
Non-catastrophe property losses	48.2			10.9			41.6			10.1			0.8
Favorable prior year casualty reserve development	(17.3		)	(3.9	)		(12.0		)	(2.9	)		(1.0	)
Total	47.9			10.8			33.2			8.1			2.7

	Six Months 2017						Six Months 2016
($ in millions)	Losses and Loss Expenses Incurred			Impact on Loss and Loss Expense Ratio			Losses and Loss Expenses Incurred			Impact on Loss and Loss Expense Ratio			Change in Ratio
Catastrophe losses	$	23.9		2.7		pts	$	15.3		1.9		pts	0.8		pts
Non-catastrophe property losses	98.0			11.1			85.2			10.5			0.6
Favorable prior year casualty reserve development	(33.7		)	(3.8	)		(30.0		)	(3.7	)		(0.1	)
Total	88.2			10.0			70.5			8.7			1.3

30

For additional information regarding the favorable prior year casualty reserve development by line of business, see the "Financial Highlights of Results for Second Quarter and Six Months 2017 and Second Quarter and Six Months 2016" section above and the line of business discussions below.

The decreases in the GAAP underwriting expense ratio in both the quarter and year-to-date periods of 1.2 points were primarily attributable to: (i) lower pension expense of 0.3 points in the quarter and 0.4 points in the year-to-date period; and (ii) lower supplemental commissions to our distribution partners of approximately 0.2 points in both periods. In addition, labor expenses decreased as a percentage of premium as we recognized productivity gains relative to the growth of our business.

The following is a discussion of our most significant Standard Commercial Lines of business and their respective statutory results:

General Liability
	Quarter ended June 30,				Change % or Points			Six Months ended June 30,				Change % or Points
($ in thousands)	2017			2016				2017			2016
Statutory NPW	$	158,721		145,489	9		%	$	313,858		290,195	8		%
Direct new business	30,012			28,865	4			56,919			54,976	4
Retention	84		%	83	1		pts	84		%	83	1		pts
Renewal pure price increases	2.9			1.6	1.3			2.6			1.8	0.8
Statutory NPE	$	141,503		129,283	9		%	$	281,487		257,368	9		%
Statutory combined ratio	78.4		%	83.5	(5.1	)	pts	75.8		%	83.4	(7.6	)	pts
% of total statutory Standard Commercial Lines NPW	33			32				33			32

The statutory combined ratio decrease in Second Quarter and Six Months2017 compared to Second Quarter and Six Months2016 was driven primarily by: (i) favorable prior year casualty reserve development, as illustrated in the tables below; (ii) lower supplemental commissions to our distribution partners of 0.3 points in each period; and (iii) lower pension expense of 0.3 points in the quarter and 0.5 points in the year-to-date period.

	Second Quarter 2017						Second Quarter 2016
($ in millions)	(Benefit) Expense			Impact on Combined Ratio			(Benefit) Expense			Impact on Combined Ratio			Change Points
Favorable prior year casualty reserve development	$	(15.0	)	(10.6	)	pts	$	(11.0	)	(8.5	)	pts	(2.1	)	pts

	Six Months 2017						Six Months 2016
($ in millions)	(Benefit) Expense			Impact on Combined Ratio			(Benefit) Expense			Impact on Combined Ratio			Change Points
Favorable prior year casualty reserve development	$	(37.4	)	(13.3	)	pts	$	(22.0	)	(8.5	)	pts	(4.8	)	pts

The significant drivers of the development were as follows:

• Second Quarter and Six Months2017: Development was primarily attributable to lower claims frequencies and severities primarily in accident years 2015 and prior, particularly in the products liability and excess liability segments.

• Second Quarter and Six Months2016: Development was primarily attributable to lower claims frequencies and severities in the 2012 through 2014 accident years, particularly in the products liability and excess liability segments.

31

Commercial Automobile
	Quarter ended June 30,				Change % or Points		Six Months ended June 30,				Change % or Points
($ in thousands)	2017			2016			2017			2016
Statutory NPW	$	119,063		108,888	9	%	$	236,449		217,096	9	%
Direct new business	20,990			20,682	1		39,550			39,272	1
Retention	84		%	84	—	pts	84		%	84	—	pts
Renewal pure price increases	6.9			4.8	2.1		6.7			4.9	1.8
Statutory NPE	$	108,316		98,896	10	%	$	215,445		194,315	11	%
Statutory combined ratio	114.1		%	107.0	7.1	pts	109.9		%	106.0	3.9	pts
% of total statutory Standard Commercial Lines NPW	25			24			25			24

The increases in the statutory combined ratio in Second Quarter and Six Months 2017 compared to the prior year periods were driven by:

• Unfavorable prior year casualty reserve development that was higher by 5.7 points in Second Quarter 2017 and 3.0 points in Six Months 2017. This development was mainly due to higher casualty claim frequency, and some increases in claim severity, in accident years 2015 and 2016; and

• Catastrophe losses that were higher by 0.6 points in Second Quarter 2017 and 0.3 points in Six Months 2017.

Quantitative information regarding the development and catastrophe losses is as follows:

	Second Quarter 2017				Second Quarter 2016
($ in millions)	Losses Incurred		Impact on Loss Ratio		Losses Incurred		Impact on  Loss Ratio		Change in Ratio
Unfavorable prior year casualty reserve development	$	15.0	13.8	pts	$	8.0	8.1	pts	5.7	pts
Catastrophe losses	0.9		0.8		0.2		0.2		0.6
Total	15.9		14.6		8.2		8.3		6.3

	Six Months 2017				Six Months 2016
($ in millions)	Losses Incurred		Impact on Loss Ratio		Losses Incurred		Impact on  Loss Ratio		Change in Ratio
Unfavorable prior year casualty reserve development	$	21.0	9.7	pts	$	13.0	6.7	pts	3.0	pts
Catastrophe losses	1.1		0.5		0.3		0.2		0.3
Total	22.1		10.2		13.3		6.9		3.3

Workers Compensation
	Quarter ended June 30,				Change % or Points			Six Months ended June 30,				Change % or Points
($ in thousands)	2017			2016				2017			2016
Statutory NPW	$	81,354		79,074	3		%	$	173,194		170,386	2		%
Direct new business	17,269			17,081	1			34,306			34,811	(1	)
Retention	83		%	84	(1	)	pts	83		%	84	(1	)	pts
Renewal pure price increases	0.5			1.3	(0.8	)		0.6			1.5	(0.9	)
Statutory NPE	$	79,460		75,251	6		%	$	158,786		151,251	5		%
Statutory combined ratio	78.3		%	87.7	(9.4	)	pts	86.9		%	84.3	2.6		pts
% of total statutory Standard Commercial Lines NPW	17			18				18			19

The variances in the statutory combined ratio in Second Quarter and Six Months2017 compared to the same prior year periods were due primarily to: (i) prior year casualty reserve development, as shown in the tables below; (ii) lower supplemental commissions to our distribution partners of 0.8 points in the quarter and 0.6 points in the year-to-date period; and (iii) lower pension expense of 0.4 points in the quarter and 0.6 points in the year-to-date period.

32

	Second Quarter 2017						Second Quarter 2016
($ in millions)	(Benefit) Expense			Impact on Combined Ratio			(Benefit) Expense			Impact on Combined Ratio			Change Points
Favorable prior year casualty reserve development	$	(15.3	)	(19.3	)	pts	$	(9.0	)	(12.0	)	pts	(7.3	)	pts

	Six Months 2017						Six Months 2016
($ in millions)	(Benefit) Expense			Impact on Combined Ratio			(Benefit) Expense			Impact on Combined Ratio			Change Points
Favorable prior year casualty reserve development	$	(15.3	)	(9.6	)	pts	$	(21.0	)	(13.9	)	pts	4.3	pts

The significant drivers of the development were as follows:

• Second Quarter and Six Months2017: Development was primarily due to lower severities in accident years 2016 and prior.

• Second Quarter and Six Months2016: Development was primarily due to lower severities in accident years 2013 and prior.

For more information regarding the initiatives that we have undertaken regarding this line of business, refer to the Standard Market Workers Compensation Line of Business discussion within the Reserves for Losses and Loss Expenses section of "Critical Accounting Policies and Estimates" of our 2016 Annual Report.

Commercial Property
	Quarter ended June 30,				Change % or Points			Six Months ended June 30,				Change % or Points
($ in thousands)	2017			2016				2017			2016
Statutory NPW	$	81,971		79,354	3		%	$	162,474		154,998	5		%
Direct new business	19,850			20,339	(2	)		37,163			38,149	(3	)
Retention	82		%	82	—		pts	82		%	82	—		pts
Renewal pure price increases	1.6			2.7	(1.1	)		2.0			2.5	(0.5	)
Statutory NPE	$	78,052		73,591	6		%	$	154,443		143,769	7		%
Statutory combined ratio	101.4		%	78.2	23.2		pts	93.7		%	84.8	8.9		pts
% of total statutory Standard Commercial Lines NPW	17			18				17			17

The fluctuation in the statutory combined ratio in Second Quarter and Six Months2017 compared to Second Quarter and Six Months2016 was driven by the following:

	Second Quarter 2017				Second Quarter 2016
($ in millions)	(Benefit) Expense		Impact on Combined Ratio		(Benefit) Expense		Impact on Combined Ratio		Change % or Points
Catastrophe losses	$	14.4	18.5	pts	$	2.9	4.0	pts	14.5	pts
Non-catastrophe property losses	31.0		39.7		23.2		31.5		8.2
Total	45.4		58.2		26.1		35.5		22.7

	Six Months 2017				Six Months 2016
($ in millions)	(Benefit) Expense		Impact on Combined Ratio		(Benefit) Expense		Impact on Combined Ratio		Change % or Points
Non-catastrophe property losses	$	58.1	37.6	pts	$	46.3	32.2	pts	5.4	pts
Catastrophe losses	20.5		13.3		13.1		9.1		4.2
Total	78.6		50.9		59.4		41.3		9.6

The increase in catastrophe losses in Second Quarter 2017 included $7.4 million, or 9.4 points, related to prior period storms. The most significant of these were three hail storms from March 2017 that added $5.5 million, or 7.0 points, to Second Quarter 2017 losses. The increase in non-catastrophe property losses in Second Quarter and Six Months2017 was driven by higher fire and weather-related losses than in Second Quarter and Six Months2016, reflecting volatility from period to period that is normally associated with our commercial property line of business.

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Standard Personal Lines

	Quarter ended June 30,					Change % or Points			Six Months ended June 30,					Change % or Points
($ in thousands)	2017				2016				2017				2016
GAAP Insurance Operations Results:
NPW	$	78,107			75,576	3		%	$	142,803			137,545	4		%
NPE	71,672				70,824	1			142,873				141,029	1
Less:
Losses and loss expenses incurred	54,725				42,212	30			99,015				81,907	21
Net underwriting expenses incurred	22,715				22,487	1			44,520				44,392	—
Underwriting (loss) gain	$	(5,768	)		6,125	(194	)	%	$	(662	)		14,730	104		%
GAAP Ratios:
Loss and loss expense ratio	76.3			%	59.6	16.7		pts	69.3			%	58.1	11.2		pts
Underwriting expense ratio	31.7				31.8	(0.1	)		31.2				31.5	(0.3	)
Combined ratio	108.0				91.4	16.6			100.5				89.6	10.9
Statutory Ratios:
Loss and loss expense ratio	76.4				59.6	16.8			69.3				58.1	11.2
Underwriting expense ratio	29.5				30.3	(0.8	)		30.5				32.0	(1.5	)
Combined ratio	105.9			%	89.9	16.0		pts	99.8			%	90.1	9.7		pts

The increases in NPW in Second Quarter and Six Months2017 compared to Second Quarter and Six Months2016 were due primarily to: (i) an increase in new business; (ii) renewal pure price increases; and (iii) improving retention.

	Quarter ended June 30,				Six Months ended June 30,
($ in millions)	2017			2016	2017			2016
New business	$	13.2		9.6	$	24.6		17.0
Retention	84		%	83	84		%	82
Renewal pure price increases	2.6			5.2	2.7			5.1

The NPE increases in Second Quarter and Six Months2017 compared to Second Quarter and Six Months2016 were consistent with the fluctuations in NPW for the twelve-month period ended June 30, 2017 compared with the twelve-month period ended June 30, 2016.

The GAAP loss and loss expense ratio increased 16.7 points in Second Quarter 2017 compared to Second Quarter 2016 and 11.2 points in Six Months 2017 compared to Six Months 2016. The quantitative breakout of these drivers were as follows:

	Second Quarter 2017						Second Quarter 2016
($ in millions)	Losses and Loss Expenses Incurred			Impact on Loss and Loss Expense Ratio			Losses and Loss Expenses Incurred			Impact on Loss and Loss Expense Ratio			Change in Ratio
Catastrophe losses	$	9.4		13.0		pts	$	2.1		3.0		pts	10.0	pts
Unfavorable prior year casualty reserve development	3.0			4.2			—			—			4.2
Non-catastrophe property losses	20.0			27.9			18.4			25.9			2.0
Flood claims handling fees	(0.8		)	(1.1	)		(0.9		)	(1.3	)		0.2
Total	31.6			44.0			19.6			27.6			16.4

	Six Months 2017						Six Months 2016
($ in millions)	Losses and Loss Expenses Incurred			Impact on Loss and Loss Expense Ratio			Losses and Loss Expenses Incurred			Impact on Loss and Loss Expense Ratio			Change in Ratio
Catastrophe losses	$	13.3		9.3		pts	$	4.3		3.1		pts	6.2	pts
Unfavorable prior year casualty reserve development	5.0			3.5			—			—			3.5
Non-catastrophe property losses	36.4			25.4			34.7			24.6			0.8
Flood claims handling fees	(1.4		)	(1.0	)		(2.0		)	(1.4	)		0.4
Total	53.3			37.2			37.0			26.3			10.9

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The prior year casualty reserve development in Second Quarter and Six Months 2017 was primarily driven by increased frequency and severity in the personal automobile liability line for accident year 2016.

The GAAP expense ratio remained relatively flat in Second Quarter and Six Months 2017 compared to Second Quarter and Six Months 2016.

E&S Insurance Operations

	Quarter ended June 30,					Change % or Points			Six Months ended June 30,					Change % or Points
($ in thousands)	2017			2016					2017			2016
GAAP Insurance Operations Results:
NPW	$	56,790		53,556		6		%	$	107,250		101,883		5		%
NPE	52,764			49,831		6			104,003			99,195		5
Less:
Losses and loss expenses incurred	33,958			34,649		(2	)		65,576			68,748		(5	)
Net underwriting expenses incurred	17,487			17,703		(1	)		35,538			31,550		13
Underwriting gain (loss)	$	1,319		(2,521	)	152		%	$	2,889		(1,103	)	362		%
GAAP Ratios:
Loss and loss expense ratio	64.4		%	69.5		(5.1	)	pts	63.0		%	69.3		(6.3	)	pts
Underwriting expense ratio	33.1			35.6		(2.5	)		34.2			31.8		2.4
Combined ratio	97.5			105.1		(7.6	)		97.2			101.1		(3.9	)
Statutory Ratios:
Loss and loss expense ratio	64.3			69.6		(5.3	)		63.2			69.3		(6.1	)
Underwriting expense ratio	32.7			33.1		(0.4	)		33.3			31.3		2.0
Combined ratio	97.0		%	102.7		(5.7	)	pts	96.5		%	100.6		(4.1	)	pts

The increase in NPW in Second Quarter and Six Months2017 compared to Second Quarter and Six Months2016 was due primarily to new business and price increases as follows:

	Quarter ended June 30,				Six Months ended June 30,
($ in millions)	2017			2016	2017		2016
Direct new business	$	24.9		25.4	48.7		47.9
Price increases	3.7		%	4.3	5.6	%	4.1

The NPE increases in Second Quarter and Six Months2017, compared to Second Quarter and Six Months2016, were consistent with the fluctuations in NPW for the twelve-month period ended June 30, 2017 compared with the twelve-month period ended June 30, 2016.

The GAAP loss and loss expense ratio decreased 5.1 points in Second Quarter 2017 and 6.3 points in Six Months 2017 compared to the same prior year periods reflecting underwriting improvements, claims initiatives, and earned rate that outpaced loss costs, which in total decreased current year loss costs by approximately 2.5 points in the quarter and 3.5 points in the year-to-date period, along with the following:

	Second Quarter 2017				Second Quarter 2016
($ in millions)	Losses and Loss Expenses Incurred		Impact on Loss and Loss Expense Ratio		Losses and Loss Expenses Incurred		Impact on Loss and Loss Expense Ratio		Change in Ratio
Non-catastrophe property losses	$	5.1	9.7	pts	$	4.4	8.7	pts	1.0		pts
Catastrophe losses	3.0		5.7		2.7		5.4		0.3
Unfavorable prior year casualty reserve development	—		—		2.0		4.0		(4.0	)
Total	8.1		15.4		9.1		18.1		(2.7	)

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	Six Months 2017				Six Months 2016
($ in millions)	Losses and Loss Expenses Incurred		Impact on Loss and Loss Expense Ratio		Losses and Loss Expenses Incurred		Impact on Loss and Loss Expense Ratio		Change in Ratio
Catastrophe losses	$	4.4	4.2	pts	$	3.2	3.2	pts	1.0		pts
Unfavorable prior year casualty reserve development	—		—		3.0		3.0		(3.0	)
Non-catastrophe property losses	10.4		10.0		10.8		10.9		(0.9	)
Total	14.8		14.2		17.0		17.1		(2.9	)

There was a 2.5-point decrease in the GAAP underwriting expense ratio in Second Quarter2017 compared to Second Quarter2016, driven primarily by the growth in premiums earned, which has more than outpaced the increase in fixed expenses, and lower supplemental commissions to our wholesale general agents of 0.8 points. These were partially offset by a higher allocation of corporate support services to this segment.

The 2.4-point increase in the GAAP underwriting expense ratio in Six Months 2017 compared to Six Months 2016 was driven by a lower cash incentive plan payment in the first quarter of 2016 for employees in this segment based on 2015 underwriting results and a higher allocation of corporate support services to this segment in 2017.

Reinsurance

We have successfully completed negotiations of our July 1, 2017 excess of loss treaties, which provide coverage for our Standard Commercial Lines, Standard Personal Lines, and E&S Lines. The renewal of these treaties included some enhancements in terms and conditions, with the same structure as the expiring treaties as follows:

Property Excess of Loss

The property excess of loss treaty ("Property Treaty") provides $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 $75.5 million.

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

Casualty Excess of Loss

The casualty excess of loss treaty (“Casualty Treaty”) provides $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 risk-adjusted after-tax income and total return of the portfolio, while maintaining our historic credit quality and duration risk profile. Our investment philosophy includes certain return and risk objectives for the fixed income, equity, and other investment portfolios. After-tax yield and income generation are key drivers to our investment strategy, which we believe will be obtained through more active management of the portfolio.

Total Invested Assets
($ in thousands)	June 30, 2017		December 31, 2016	Change % or Points
Total invested assets	$	5,503,047	5,364,947	3		%
Invested assets per dollar of stockholders' equity	3.33		3.50	(5	)
Unrealized gain – before tax	126,014		64,803	94
Unrealized gain – after tax	81,909		42,122	94

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The increase in invested assets at June 30, 2017 compared to December 31, 2016 was primarily driven by operating cash flow of $123.7 million, and an increase in unrealized gains of $61.2 million. The $61.2 million change in unrealized gains was driven by our fixed income securities portfolio, which was favorably impacted by tightening credit spreads and a decrease in risk-free rates.

Fixed Income Securities

At June 30, 2017, our fixed income securities portfolio represented 93% of our total invested assets, largely unchanged compared to December 31, 2016. The effective duration and spread duration of the fixed income securities portfolio as of June 30, 2017 was 3.7 years and 4.4 years, respectively, including short-term investments. The Insurance Subsidiaries’ liability duration is approximately 4.0 years. Effective duration provides an approximate measure of the portfolio's price sensitivity to a change in interest rates, while spread duration provides an approximate measure of the portfolio's price sensitivity to spread changes, which are the differences between the yields on particular debt instruments and the yields of U.S. Treasury debt securities with similar maturities. The effective and spread durations of the fixed income securities portfolio are monitored and managed to maximize yield while managing interest rate risk and credit risk, respectively, at an acceptable level. We maintain a well-diversified portfolio across sectors, credit quality, and maturities that affords us ample liquidity. Every purchase or sale is made with the intent of maximizing risk-adjusted investment returns in the current market environment while balancing capital preservation.

Our fixed income securities portfolio had a weighted average credit rating of "AA-" with 97% of the securities in the portfolio being investment grade quality at both June 30, 2017 and December 31, 2016. Within our fixed income securities portfolio, we maintained an allocation of non-investment grade high-yield securities, which represented 3% of our fixed income securities portfolio as of both June 30, 2017 and December 31, 2016. The sector composition and credit quality of our major asset categories within our fixed income securities portfolio did not significantly change from December 31, 2016. However, we have recently increased our exposure to floating rate fixed income securities, which is largely reflective of our increased allocation to collateralized loan obligations ("CLO"). Floating rate securities represented approximately 17% of our fixed income securities portfolio as of June 30, 2017, compared to 13% as of December 31, 2016. The increase in floating rate instruments, which are primarily indexed to the 90-day LIBOR, will increase the sensitivity of changes to our book yield and investment income.

For details regarding the credit quality of our portfolio, see Item 7A. “Quantitative and Qualitative Disclosures About Market Risk.” of our 2016 Annual Report.

Net Investment Income

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

	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Fixed income securities	$	37,668		31,753		74,559		63,397
Equity securities	1,419			2,204		2,887		4,434
Short-term investments	377			142		627		301
Other investments	5,231			(611	)	6,834		(1,677	)
Investment expenses	(3,265		)	(2,306	)	(6,058	)	(4,504	)
Net investment income earned – before tax	41,430			31,182		78,849		61,951
Net investment income tax expense	(11,127		)	(7,657	)	(21,095	)	(14,866	)
Net investment income earned – after tax	$	30,303		23,525		57,754		47,085
Effective tax rate	26.9		%	24.6		26.8		24.0
Annualized after-tax yield on fixed income securities	2.2			2.0		2.2		2.0
Annualized after-tax yield on investment portfolio	2.2			1.8		2.1		1.8

The increase in net investment income in both Second Quarter2017 and Six Months 2017 was driven primarily by our fixed income securities portfolio, which benefited fromimproved new money reinvestment yields, our increased allocation to non-investment grade securities, and repositioning within the investment grade fixed income portfolio. In addition, income from our alternative investment portfolio increased in both periods due to valuation improvements in the private equity and energy-related sectors.

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Realized 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 gains (losses) for the indicated periods were as follows:

	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Net realized gains, excluding OTTI	$	2.9		2.3		5.4		3.2
OTTI	(1.2		)	(0.5	)	(4.7	)	(4.1	)
Total net realized gains (losses)	1.7			1.8		0.7		(0.9	)

For further discussion of our realized gains and losses, as well as our OTTI methodology, see Note 2. “Summary of Significant Accounting Policies” in Item 8. “Financial Statements and Supplementary Data.” of our 2016 Annual Report. For additional information about our OTTI charges, see Note 4. "Investments" in Item 1. "Financial Statements." of this Form 10-Q.

Federal Income Taxes

The following table provides information regarding federal income taxes:

	Quarter ended June 30,				Six Months ended June 30,
($ in millions)	2017			2016	2017	2016
Federal income tax expense	$	17.5		18.7	34.6	33.6
Effective tax rate	29.7		%	30.0	27.4	29.4

The effective tax rate in the table above differs from the statutory tax rate of 35% primarily because of tax-advantaged interest

and dividend income. The decrease in our effective tax rate in Second Quarter and Six Months 2017 compared to Second Quarter and Six Months 2016 was driven primarily by our adoption of ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-based Payment Accounting ("ASU 2016-09") on January 1, 2017, which requires that the tax effects of share-based compensation be recognized in the income tax provision as discrete items outside of the annual estimated expected tax rate. All excess tax benefits and tax deficiencies are recognized as income tax benefit or expense in the income statement and reduced our effective tax rate by 0.6 points and 2.6 points in Second Quarter and Six Months 2017, respectively. Previously, these amounts were recorded in additional paid-in capital. For further information on our adoption of ASU 2016-09, refer to Note 2. "Adoption of Accounting Pronouncements" in Item 1. "Financial Statements." of this Form 10-Q.

We believe that our future effective tax rate will continue to be impacted by similar items, assuming no significant changes to

tax laws. However, the U.S. federal income tax structure is currently under significant debate as a result of the last

Presidential election. We are unable to provide an estimate of the magnitude of potential changes.

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 and short-term investment position of $142 million at June 30, 2017 was comprised of $21 million at the Parent and $121 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 $84 million at June 30, 2017, compared to $74 million at December 31, 2016.

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.

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Insurance Subsidiary Dividends

We currently anticipate that the Insurance Subsidiaries will pay $80 million in total dividends to the Parent in 2017, of which $40 million was paid during Six Months2017. As of June 30, 2017, our allowable ordinary maximum dividend was $199 million for 2017, which is a $6 million increase from December 31, 2016 due to an Indiana regulation change regarding the calculation of ordinary dividends, which impacted two of our insurance subsidiaries.

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 2016 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, including short-term investments, was 3.7 years as of June 30, 2017, while the liabilities of the Insurance Subsidiaries have a duration of 4.0 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 which varies and is based on, among other factors, the Parent's debt ratings. There were no balances outstanding under the Line of Credit at June 30, 2017 or at any time during 2017.

The Line of Credit agreement contains representations, warranties, and covenants that are customary for credit facilities of this type, including, without limitation, financial covenants under which we are obligated to maintain a minimum consolidated net worth, a minimum combined statutory surplus, and a maximum ratio of consolidated debt to total capitalization, as well as covenants limiting our ability to: (i) merge or liquidate; (ii) incur debt or liens; (iii) dispose of assets; (iv) make certain investments and acquisitions; and (v) engage in transactions with affiliates.

The table below outlines information regarding certain of the covenants in the Line of Credit:

	Required as of June 30, 2017	Actual as of June 30, 2017
Consolidated net worth	Not less than $1.1 billion	$1.7 billion
Statutory surplus	Not less than $750 million	$1.7 billion
Debt-to-capitalization ratio1	Not to exceed 35%	21.2%
A.M. Best financial strength rating	Minimum of A-	A

¹  Calculated in accordance with the Line of Credit agreement.

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.

39

All borrowings from both the FHLBI and the FHLBNY are required to be secured by investments pledged as collateral. For additional information regarding collateral outstanding, refer to Note 4. "Investments" in Item 1. "Financial Statements." of this Form 10-Q. The following table provides information on the remaining capacity for Federal Home Loan Bank borrowings as of June 30, 2017 based on these restrictions, as well as the amount of additional stock that would need to be purchased to allow these member companies to borrow their remaining capacity:

($ in millions)	Admitted Assets		Borrowing Limitation		Amount Borrowed	Remaining Capacity	Additional Stock Requirements
SICSC	$	644.9	$	64.5	32.0	32.5	1.4
SICSE	490.7		49.1		28.0	21.1	0.9
SICA	2,314.2		231.4		50.0	181.4	8.2
SICNY	427.4		21.4		—	21.4	1.0
Total			$	366.4	110.0	256.4	11.5

Short-term Borrowings

In the first quarter of 2017, SICA borrowed $64 million from the FHLBNY, which was repaid on March 21, 2017. 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 following table provides information on the Parent’s borrowings and remaining borrowing capacity from the Indiana Subsidiaries:

($ in millions)	Admitted Assets as of December 31, 2016		Borrowing Limitation		Amount Borrowed	Remaining Capacity
As of June 30, 2017
SICSC	$	644.9	$	64.5	27.0	37.5
SICSE	490.7		49.1		18.0	31.1
Total			$	113.6	45.0	68.6

Capital Market Activities

The Parent had no private or public issuances of stock or debt instruments during Six Months 2017.

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.

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 principal debt repayment is due in 2021.

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 June 30, 2017, we had GAAP stockholders' equity and statutory surplus of $1.7 billion. With total debt of $438.9 million, our debt-to-capital ratio was approximately 21.0% at June 30, 2017.

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.”

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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 operations, issuing additional debt and/or equity securities, 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 by 7% to $28.32 as of June 30, 2017, from $26.42 as of December 31, 2016, due to $1.55 in net income and $0.68 in unrealized gains on our investment portfolio, partially offset by $0.32 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. We have been rated “A” or higher by A.M. Best for the past 87 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.

Our 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 2016 Annual Report and continue to be as follows:

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

In Second Quarter 2017, Fitch reaffirmed our "A+" rating with a "stable" outlook. In taking this action, Fitch cited our strong underwriting results, solid capitalization with growth in stockholders' equity, stable leverage metrics, and stable interest coverage metrics.

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 June 30, 2017 and December 31, 2016, 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.

Contractual Obligations, Contingent Liabilities, and Commitments

Our future cash payments associated with: (i) loss and loss expense reserves; (ii) contractual obligations pursuant to operating leases for office space and equipment; and (iii) debt have not materially changed since December 31, 2016. As of June 30, 2017, we had contractual obligations that expire at various dates through 2030 that may require us to invest up to $165 million in alternative and other investments. There is no certainty that any such additional investment will be required. Additionally, as of June 30, 2017, we had contractual obligations that expire in 2019 to invest $12.0 million in a non-publicly traded common stock within our AFS portfolio. 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 12. "Related Party Transactions" in Item 1. "Financial Statements." of this Form 10-Q.

41

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 2016 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 Six Months 2017 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 are named as defendants in various legal proceedings. Most of these proceedings 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 losses and loss expense reserves. We expect that any potential ultimate liability in such ordinary course claims litigation will not be material to our consolidated financial condition, results of operations, or cash flows after consideration of provisions made for potential losses and costs of defense.

From time to time, our insurance subsidiaries also are named as defendants in other legal actions, some of which assert claims for substantial amounts. These actions include, among others, putative class actions seeking certification of a state or national class. Such putative class actions have alleged, for example, improper reimbursement of medical providers paid under workers compensation and personal and commercial automobile insurance policies. Similarly, our Insurance Subsidiaries are also named from time-to-time in individual actions seeking extra-contractual damages, punitive damages, or penalties, some of which allege bad faith in the handling of insurance claims. We believe that we have valid defenses to these cases. We expect that any potential ultimate liability in any such lawsuit will not be material to our consolidated financial condition, after consideration of provisions made for estimated losses. Nonetheless, given the inherent unpredictability of litigation and the large or indeterminate amounts sought in certain of these actions, an adverse outcome in certain matters could possibly have a material adverse effect on our consolidated results of operations or cash flows in particular quarterly or annual periods.

As of June 30, 2017, we do not believe the Company was 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, redeeming our fixed income securities, 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 2016 Annual Report.

42

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

The following table provides information regarding our purchases of our common stock in Second Quarter 2017:

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
April 1 – 30, 2017	792	$	50.14	—	—
May 1 - 31, 2017	4,835	51.74		—	—
June 1 - 30, 2017	1,636	49.78		—	—
Total	7,263	$	51.12	—	—

¹During Second Quarter 2017, 2,428 shares were purchased from employees in connection with the vesting of restricted stock units and 4,835 shares were purchased from employees in connection with option exercises. These repurchases were made to satisfy tax withholding obligations and/or option costs with respect to those employees. These shares were not purchased as part of any publicly announced program. The shares that were purchased in connection with the vesting of restricted stock units were purchased at fair market value as defined in the Selective Insurance Group, Inc. 2014 Omnibus Stock Plan and the Selective Insurance Group, Inc. 2005 Omnibus Stock Plan As Amended and Restated Effective as of May 1, 2010. The shares purchased in connection with the option exercises were purchased at the current market prices of our common stock on the dates the options were exercised.

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.INS	XBRL Instance Document.
** 101.SCH	XBRL Taxonomy Extension Schema Document.
** 101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document.
** 101.LAB	XBRL Taxonomy Extension Label Linkbase Document.
** 101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document.
** 101.DEF	XBRL Taxonomy Extension Definition Linkbase Document.

 * Filed herewith.

** Furnished and not filed herewith.

43

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

By: /s/ Gregory E. Murphy	July 27, 2017
Gregory E. Murphy
Chairman of the Board and Chief Executive Officer
By: /s/ Mark A. Wilcox	July 27, 2017
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

Second Quarter 2017	Income (Numerator)		Shares (Denominator)	Per Share Amount
(in thousands, except per share amounts)
Basic Earnings Per Share ("EPS"):
Net income available to common stockholders	$	41,426	58,441	$	0.71
Effect of dilutive securities:
Stock compensation plans	—		781
Diluted EPS:
Net income available to common stockholders	$	41,426	59,222	$	0.70

Second Quarter 2016	Income (Numerator)		Shares (Denominator)	Per Share Amount
(in thousands, except per share amounts)
Basic EPS:
Net income available to common stockholders	$	43,601	57,861	$	0.75
Effect of dilutive securities:
Stock compensation plans	—		737
Diluted EPS:
Net income available to common stockholders	$	43,601	58,598	$	0.74

Six Months 2017	Income (Numerator)		Shares (Denominator)	Per Share Amount
(in thousands, except per share amounts)
Basic EPS:
Net income available to common stockholders	$	91,866	58,363	$	1.57
Effect of dilutive securities:
Stock compensation plans	—		822
Diluted EPS:
Net income available to common stockholders	$	91,866	59,185	$	1.55

Six Months 2016	Income (Numerator)		Shares (Denominator)	Per Share Amount
(in thousands, except per share amounts)
Basic EPS:
Net income available to common stockholders	$	80,633	57,768	$	1.40
Effect of dilutive securities:
Stock compensation plans	—		784
Diluted EPS:
Net income available to common stockholders	$	80,633	58,552	$	1.38

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:	July 27, 2017	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:	July 27, 2017	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 June 30, 2017 (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:	July 27, 2017	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 June 30, 2017 (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:	July 27, 2017	By: /s/ Mark A. Wilcox
		Mark A. Wilcox
		Executive Vice President and Chief Financial Officer

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 14, 2017
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Entity Registrant Name	SELECTIVE INSURANCE GROUP INC
Entity Central Index Key	0000230557
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock , Shares Outstanding		58,364,187

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
ASSETS
Fixed income securities, held-to-maturity – at carrying value (fair value: $75,540 – 2017; $105,211 – 2016)	$ 72,514	$ 101,556
Fixed income securities, available-for-sale – at fair value (amortized cost: $4,923,005 – 2017; $4,753,759 – 2016)	5,018,722	4,792,540
Equity securities, available-for-sale – at fair value (cost: $131,463 – 2017; $120,889 – 2016)	161,694	146,753
Short-term investments (at cost which approximates fair value)	133,706	221,701
Other investments	116,411	102,397
Total investments (Note 4 and 6)	5,503,047	5,364,947
Cash	8,628	458
Interest and dividends due or accrued	40,231	40,164
Premiums receivable, net of allowance for uncollectible accounts of: $6,627 – 2017; $5,980 – 2016	764,340	681,611
Reinsurance recoverable, net of allowance for uncollectible accounts of: $5,200 – 2017; $5,500 – 2016	601,887	621,537
Prepaid reinsurance premiums	151,898	146,282
Current federal income tax	0	2,486
Deferred federal income tax	60,388	84,840
Property and equipment – at cost, net of accumulated depreciation and amortization of: $206,847 – 2017; $198,729 – 2016	66,255	69,576
Deferred policy acquisition costs	234,903	222,564
Goodwill	7,849	7,849
Other assets	88,778	113,534
Total assets	7,528,204	7,355,848
Liabilities And Stockholders' Equity
Reserve for losses and loss expenses (Note 8)	3,731,221	3,691,719
Unearned premiums	1,352,068	1,262,819
Long-term debt	438,894	438,667
Current federal income tax	2,104	0
Accrued salaries and benefits	103,177	132,880
Other liabilities	248,184	298,393
Total liabilities	5,875,648	5,824,478
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: 102,150,866 – 2017; 101,620,436 – 2016	204,302	203,241
Additional paid-in capital	359,982	347,295
Retained earnings	1,641,820	1,568,881
Accumulated other comprehensive income (loss) (Note 11)	24,497	(15,950)
Treasury stock – at cost (shares: 43,788,147 – 2017; 43,653,237 – 2016)	(578,045)	(572,097)
Total stockholders' equity	1,652,556	1,531,370
Commitments and contingencies
Total liabilities and stockholders' equity	$ 7,528,204	$ 7,355,848

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fixed income securities, held-to-maturity, fair value	$ 75,540	$ 105,211
Fixed income securities, available-for-sale, amortized cost	4,923,005	4,753,759
Equity securities, available-for-sale, cost	131,463	120,889
Premiums receivable, allowance for uncollectible accounts	6,627	5,980
Reinsurance recoverable, allowance for uncollectible accounts	5,200	5,500
Property and equipment - at cost, accumulated depreciation and amortization	$ 206,847	$ 198,729
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	102,150,866	101,620,436
Treasury stock - at cost, shares	43,788,147	43,653,237

XML

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Net premiums earned	$ 568,030	$ 531,932	$ 1,128,884	$ 1,054,390
Net investment income earned	41,430	31,182	78,849	61,951
Net realized gains (losses):
Net realized investment gains	2,951	2,314	5,381	3,203
Other-than-temporary impairments	(1,211)	(559)	(4,686)	(4,152)
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	(6)	10	(6)	10
Total net realized gains (losses)	1,734	1,765	689	(939)
Other income	3,291	3,868	6,532	4,819
Total revenues	614,485	568,747	1,214,954	1,120,221
Expenses:
Losses and loss expenses incurred	341,559	298,479	659,031	595,623
Policy acquisition costs	196,824	190,731	393,052	373,958
Interest expense	6,081	5,620	12,187	11,226
Other expenses	11,092	11,606	24,181	25,228
Total expenses	555,556	506,436	1,088,451	1,006,035
Income before federal income tax	58,929	62,311	126,503	114,186
Federal income tax expense:
Current	17,785	18,318	32,058	32,402
Deferred	(282)	392	2,579	1,151
Total federal income tax expense	17,503	18,710	34,637	33,553
Net income	$ 41,426	$ 43,601	$ 91,866	$ 80,633
Earnings per share:
Basic net income	$ 0.71	$ 0.75	$ 1.57	$ 1.40
Diluted net income	0.70	0.74	1.55	1.38
Dividends to stockholders	$ 0.16	$ 0.15	$ 0.32	$ 0.30

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net income	$ 41,426	$ 43,601	$ 91,866	$ 80,633
Unrealized holding gains arising during period	23,326	36,188	40,087	78,917
Non-Credit Portion of Other-Than-Temporary Impairments Recognized in Other Comprehensive Income	4	(6)	4	(6)
Amounts reclassified into net income: Held-to-maturity securities	(28)	(12)	(60)	(59)
Amounts reclassified into net income: Realized (gains) losses on available-for-sale securities	(1,225)	(1,145)	(244)	609
Total unrealized gains on investment securities	22,077	35,025	39,787	79,461
Amount reclassified into net income: Net actuarial loss	330	985	660	1,971
Total defined benefit pension and post-retirement plans	330	985	660	1,971
Other comprehensive income	22,407	36,010	40,447	81,432
Comprehensive income	$ 63,833	$ 79,611	$ 132,313	$ 162,065

XML

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Accumulated other comprehensive income [Member]	Treasury stock [Member]
Beginning of year at Dec. 31, 2015		$ 201,723	$ 326,656	$ 1,446,192	$ (9,425)	$ (567,105)
Dividend reinvestment plan (shares: 15,419 – 2017; 20,808 – 2016)		42	696
Stock purchase and compensation plans (shares: 515,011 – 2017; 569,034 – 2016)		1,138	12,757
Net income	$ 80,633			80,633
Dividends to stockholders ($0.32 per share – 2017; $0.30 per share – 2016)				(17,583)
Other comprehensive income	81,432				81,432
Acquisition of treasury stock (shares: 134,910 – 2017; 138,007 – 2016)						(4,419)
End of period at Jun. 30, 2016	1,552,737	202,903	340,109	1,509,242	72,007	(571,524)
Beginning of year at Dec. 31, 2016	1,531,370	203,241	347,295	1,568,881	(15,950)	(572,097)
Dividend reinvestment plan (shares: 15,419 – 2017; 20,808 – 2016)		31	693
Stock purchase and compensation plans (shares: 515,011 – 2017; 569,034 – 2016)		1,030	11,994
Net income	91,866			91,866
Dividends to stockholders ($0.32 per share – 2017; $0.30 per share – 2016)				(18,927)
Other comprehensive income	40,447				40,447
Acquisition of treasury stock (shares: 134,910 – 2017; 138,007 – 2016)						(5,948)
End of period at Jun. 30, 2017	$ 1,652,556	$ 204,302	$ 359,982	$ 1,641,820	$ 24,497	$ (578,045)

XML

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Dividend reinvestment plan, shares			15,419	20,808
Stock purchase and compensation plans, shares			515,011	569,034
Dividends to stockholders, per share	$ 0.16	$ 0.15	$ 0.32	$ 0.30
Acquisition of treasury stock, shares			134,910	138,007
Preferred stock, par value per share	$ 0	$ 0	$ 0	$ 0	$ 0
Preferred stock, shares authorized	5,000,000	5,000,000	5,000,000	5,000,000	5,000,000
Preferred stock, shares issued	0	0	0	0	0
Series A Preferred Stock [Member]
Preferred stock, par value per share	$ 0	$ 0	$ 0	$ 0
Preferred stock, shares authorized	300,000	300,000	300,000	300,000

XML

Consolidated Statements of Cash Flow - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating Activities
Net income	$ 91,866	$ 80,633
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	25,409	30,155
Stock-based compensation expense	8,372	7,203
Undistributed (gains) losses of equity method investments	(3,575)	1,677
Loss on disposal of fixed assets	998	0
Net realized (gains) losses	(689)	939
Changes in assets and liabilities:
Increase in reserve for losses and loss expenses, net of reinsurance recoverable	59,152	41,986
Increase in unearned premiums, net of prepaid reinsurance	83,633	89,109
Decrease in net federal income taxes	7,263	2,380
Increase in premiums receivable	(82,729)	(91,391)
Increase in deferred policy acquisition costs	(12,339)	(15,395)
Increase in interest and dividends due or accrued	(204)	(1,030)
Decrease in accrued salaries and benefits	(29,703)	(48,603)
Decrease (increase) in other assets	24,953	(3,877)
Decrease in other liabilities	(48,684)	(34,659)
Net cash provided by operating activities	123,723	59,127
Investing Activities
Purchase of fixed income securities, held-to-maturity	0	(4,235)
Purchase of fixed income securities, available-for-sale	(1,194,142)	(411,538)
Purchase of equity securities, available-for-sale	(22,115)	(16,796)
Purchase of other investments	(22,121)	(17,734)
Purchase of short-term investments	(2,259,305)	(691,496)
Sale of fixed income securities, available-for-sale	717,072	22,114
Sale of short-term investments	2,348,892	680,865
Redemption and maturities of fixed income securities, held-to-maturity	28,730	44,615
Redemption and maturities of fixed income securities, available-for-sale	300,430	264,244
Sale of equity securities, available-for-sale	6,289	83,793
Distributions from other investments	9,843	13,380
Purchase of property and equipment	(7,047)	(8,187)
Net cash used in investing activities	(93,474)	(40,975)
Financing Activities
Dividends to stockholders	(17,922)	(16,569)
Acquisition of treasury stock	(5,948)	(4,419)
Net proceeds from stock purchase and compensation plans	4,045	4,368
Proceeds from borrowings	64,000	55,000
Repayments of borrowings	(64,000)	(55,000)
Excess tax benefits from share-based payment arrangements	0	1,761
Repayments of capital lease obligations	(2,254)	(2,661)
Net cash used in financing activities	(22,079)	(17,520)
Net increase in cash	8,170	632
Cash, beginning of year	458	898
Cash, end of period	$ 8,628	$ 1,530

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Basis of Presentation

6 Months Ended

Jun. 30, 2017

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 second quarters ended June 30, 2017 (“Second Quarter 2017”) and June 30, 2016 (“Second Quarter 2016”) and the six-month periods ended June 30, 2017 ("Six Months 2017") and June 30, 2016 ("Six Months 2016"). The Financial Statements do not include all of the information and disclosures required by GAAP and the SEC for audited annual financial statements. 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, 2016 (“2016 Annual Report”) filed with the SEC.

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Accounting Pronouncements

6 Months Ended

Jun. 30, 2017

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Accounting Pronouncements

Accounting Pronouncements 

In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") 2016-09, Compensation - Stock Compensation: Improvements to Employee Share-based Payment Accounting (“ASU 2016-09”). ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions. We adopted this guidance on January 1, 2017, which resulted in the following impacts on our consolidated financial statements:

Consolidated Statements of Income

The new standard requires that the tax effects of share-based compensation be recognized in the income tax provision as discrete items outside of the annual estimated expected tax rate. In addition, all excess tax benefits and tax deficiencies should be recognized as income tax benefit or expense in the income statement. Previously, these amounts were recorded in additional paid-in capital. In addition, in calculating potential common shares used to determine diluted earnings per share, GAAP requires us to use the treasury stock method. The new standard requires that assumed proceeds under the treasury stock method be modified to exclude the amount of excess tax benefits that would have been recognized in additional paid-in capital. These changes were adopted on a prospective basis. As a result of adoption, we recognized an income tax benefit in the Consolidated Statements of Income of $0.4 million in Second Quarter 2017 and $3.3 million in Six Months 2017 related to stock grants that have vested this year.

In recording share-based compensation expense, ASU 2016-09 allows companies to make a policy election as to whether they will include an estimate of awards expected to be forfeited or whether they will account for forfeitures as they occur. We have elected to include an estimate of forfeitures in the computation of our share-based compensation expense. As this treatment is consistent with previous guidance, this election had no impact on our consolidated financial statements.

Consolidated Statements of Cash Flows

ASU 2016-09 requires that excess tax benefits from share-based awards be reported as operating activities in the consolidated statement of cash flows. Previously, these cash flows were included in financing activities. We elected to apply this change on a prospective basis; therefore, no changes have been made to the prior periods disclosed in this report.

The standard also requires that employee taxes paid when an employer withholds shares for tax-withholding purposes be reported as financing activities in the consolidated statement of cash flows. This requirement has no impact to us as we have historically reported these cash flows as part of financing activities.

In October 2016, the FASB issued ASU 2016-17, Consolidation: Interests Held through Related Parties That Are Under Common Control ("ASU 2016-17"). ASU 2016-17 changes how a decision maker considers indirect interests in a variable interest entity ("VIE") held under common control in making the primary beneficiary determination. ASU 2016-17 was effective for annual periods beginning after December 15, 2016, including interim periods within those annual periods. The adoption of ASU 2016-17 did not impact us, as we are not the decision maker in any of the VIEs in which we are invested.

Pronouncements to be effective in the future

In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). ASU 2016-01 provides guidance to improve certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. Specifically the guidance: (i) requires equity investments to be measured at fair value with changes in fair value recognized in earnings; (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment; (iii) eliminates the requirement to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost; (iv) requires the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes; and (v) clarifies that the need for a valuation allowance on a deferred tax asset related to an available-for-sale ("AFS") security should be evaluated with other deferred tax assets.

ASU 2016-01 is effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods. Our adoption of this guidance will require a cumulative-effect adjustment to the balance sheet as of January 1, 2018 in an amount equal to the after-tax net unrealized gain or loss on our equity portfolio as of year-end 2017. If this guidance had been adopted as of the beginning of 2017, the cumulative-effect adjustment would have been approximately $17 million and we would have recognized additional after-tax net income of approximately $3 million or $0.05 per diluted share, reflecting the change in fair value during Six Months 2017.

In February 2016, the FASB issued ASU 2016-02, Leases (“ASU 2016-02”). ASU 2016-02 requires all lessees to recognize a lease liability and a right-of-use asset, measured at the present value of the future minimum lease payments, at the lease commencement date. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim reporting periods within that fiscal year, with early adoption permitted. ASU 2016-02 requires the application of a modified retrospective approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. While we are currently evaluating ASU 2016-02, we do not expect a material impact on our financial condition or results of operations from the adoption of this guidance.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (“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 debt securities, trade receivables, and reinsurance receivables. ASU 2016-13 requires a valuation allowance to be calculated on these 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. ASU 2016-13 is effective for fiscal years beginning after December 15, 2019, including interim periods within those annual periods. Early adoption is permitted, but no earlier than fiscal years beginning after December 15, 2018. We are currently evaluating the impact of this guidance on our financial condition and results of operations.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (“ASU 2016-15”). ASU 2016-15 adds or clarifies guidance on the classification of certain cash receipts and payments in the statement of cash flows, including, but not limited to: (i) debt prepayment or debt extinguishment costs; (ii) proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; (iii) distributions received from equity method investees; and (iv) separately identifiable cash flows and application of the predominance principle. ASU 2016-15 is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. We are currently evaluating the impact of this guidance on our statement of cash flows.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows: Restricted Cash ("ASU 2016-18"). ASU 2016-18, requires that restricted cash and restricted cash equivalents be included with cash and cash equivalents in the reconciliation of beginning and ending cash on the statements of cash flows. This update also requires a reconciliation of the statement of the cash flows to the balance sheet if the balance sheet includes more than one line item of cash, cash equivalents, and restricted cash. ASU 2016-18 is effective, with retrospective adoption, for annual periods beginning after December 15, 2017, and interim periods within those annual periods. We currently have restricted cash associated with the National Flood Insurance Program ("NFIP") in "Other assets." This literature will impact the presentation of this item in both the Consolidated Balance Sheets and the Statements of Cash Flows.

In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other: Simplifying the Test for Goodwill Impairment (“ASU 2017-04”). ASU 2017-04 eliminates the second step of the two part goodwill impairment test, which required entities to determine the fair value of individual assets and liabilities of a reporting unit to measure the goodwill impairment. Under the new guidance, a goodwill impairment is calculated as the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The amendments in this update should be applied on a prospective basis for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. We do not expect a material impact on our financial condition or results of operations from the adoption of this guidance.

In March 2017, the FASB issued ASU 2017-07, Compensation-Retirement Benefits:Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost ("ASU 2017-07"). ASU 2017-07 requires that an employer report a pension plan's service cost in the same line item or line items as other compensation costs arising from services rendered by pertinent employees during the period. ASU 2017-07 also requires that other components of net benefit cost be presented in the income statement separately from the service cost component. If a separate line item or items are not used, the line item or items used in the income statement to present the other components of net benefit cost must be disclosed. ASU 2017-07 is effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods, with early adoption permitted at the beginning of an annual period. As our pension plan was frozen as of March 2016, we ceased accruing additional service fee costs at that time. Therefore, the application of this guidance is not anticipated to impact our financial condition, results of operations, or disclosures.

In March 2017, the FASB issued ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs: Premium Amortization on Purchased Callable Debt Securities ("ASU 2017-08"). ASU 2017-08 revises the amortization period for certain callable debt securities held at a premium, requiring the premium to be amortized to the earliest call date. Under current GAAP, entities generally amortize the premium as an adjustment of yield over the contractual life of the instrument. ASU 2017-08 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2018, with early adoption permitted. This ASU does not impact us, as we amortize premium on these callable debt securities to the earliest call date.

In May 2017, the FASB issued ASU 2017-09, Compensation - Stock Compensation: Scope of Modification Accounting ("ASU 2017-09"). ASU 2017-09 provides clarification about which changes to the terms or conditions of a share-based payment award would require the application of modification accounting. ASU 2017-09 is effective for annual and interim periods beginning after December 15, 2017, with early adoption permitted. The adoption of this guidance is not anticipated to impact us, as we currently record modifications in accordance with this ASU.

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Statements of Cash Flow

6 Months Ended

Jun. 30, 2017

Supplemental Cash Flow Information [Abstract]

Statements of Cash Flow

Statements of Cash Flows

Supplemental cash flow information was as follows:

	Six Months ended June 30,
($ in thousands)	2017		2016
Cash paid during the period for:
Interest	$	11,963	10,986
Federal income tax	27,000		29,000
Non-cash items:
Exchange of fixed income securities, AFS	1,029		17,702
Corporate actions related to equity securities, AFS1	—		3,032
Assets acquired under capital lease arrangements	278		2,999
Non-cash purchase of property and equipment	—		577

¹Examples of such corporate actions include non-cash acquisitions and stock splits.

Included in "Other assets" on the Consolidated Balance Sheets was $8.1 million at June 30, 2017 and $8.9 million at June 30, 2016 of cash received from the NFIP, which is restricted to pay flood claims under the Write Your Own ("WYO") program.

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Investments

6 Months Ended

Jun. 30, 2017

Investments [Abstract]

Investments

Investments

(a) Information regarding our held-to-maturity ("HTM") fixed income securities as of June 30, 2017 and December 31, 2016 was as follows:

June 30, 2017
($ in thousands)	Amortized Cost		Net  Unrealized Gains  (Losses)		Carrying Value	Unrecognized  Holding Gains	Unrecognized Holding  Losses	Fair Value
Obligations of states and political subdivisions	$	53,734	185		53,919	1,703	—	55,622
Corporate securities	18,714		(119	)	18,595	1,323	—	19,918
Total HTM fixed income securities	$	72,448	66		72,514	3,026	—	75,540

December 31, 2016
($ in thousands)	Amortized Cost		Net  Unrealized Gains  (Losses)		Carrying Value	Unrecognized  Holding Gains	Unrecognized Holding  Losses		Fair Value
Obligations of states and political subdivisions	$	77,466	317		77,783	2,133	—		79,916
Corporate securities	22,711		(143	)	22,568	1,665	(158	)	24,075
Commercial mortgage-backed securities ("CMBS")	1,220		(15	)	1,205	15	—		1,220
Total HTM fixed income securities	$	101,397	159		101,556	3,813	(158	)	105,211

Unrecognized holding gains and losses of HTM securities are not reflected in the Financial Statements, as they represent fair value fluctuations from the later of: (i) the date a security is designated as HTM; or (ii) the date that an other-than-temporary impairment (“OTTI”) charge is recognized on an HTM security, through the date of the balance sheet.

(b) Information regarding our AFS securities as of June 30, 2017 and December 31, 2016 was as follows:

June 30, 2017
($ in thousands)	Cost/ Amortized Cost		Unrealized Gains	Unrealized Losses		Fair Value
AFS fixed income securities:
U.S. government and government agencies	$	66,932	1,103	(32	)	68,003
Foreign government	18,157		557	—		18,714
Obligations of states and political subdivisions	1,360,211		45,641	(1,086	)	1,404,766
Corporate securities	1,782,993		39,041	(524	)	1,821,510
Collateralized loan obligations and other asset-backed securities ("CLO and other ABS")	698,594		4,108	(178	)	702,524
CMBS	277,320		2,128	(243	)	279,205
Residential mortgage-backed securities (“RMBS”)	718,798		6,068	(866	)	724,000
Total AFS fixed income securities	4,923,005		98,646	(2,929	)	5,018,722
AFS equity securities:
Common stock	115,315		30,108	(987	)	144,436
Preferred stock	16,148		1,110	—		17,258
Total AFS equity securities	131,463		31,218	(987	)	161,694
Total AFS securities	$	5,054,468	129,864	(3,916	)	5,180,416

December 31, 2016
($ in thousands)	Cost/ Amortized Cost		Unrealized Gains	Unrealized Losses		Fair Value
AFS fixed income securities:
U.S. government and government agencies	$	75,139	2,230	(36	)	77,333
Foreign government	26,559		322	(16	)	26,865
Obligations of states and political subdivisions	1,366,287		18,610	(5,304	)	1,379,593
Corporate securities	1,976,556		27,057	(5,860	)	1,997,753
CLO and other ABS	527,876		1,439	(355	)	528,960
CMBS	256,356		1,514	(1,028	)	256,842
RMBS	524,986		3,006	(2,798	)	525,194
Total AFS fixed income securities	4,753,759		54,178	(15,397	)	4,792,540
AFS equity securities:
Common stock	104,663		26,250	(305	)	130,608
Preferred stock	16,226		274	(355	)	16,145
Total AFS equity securities	120,889		26,524	(660	)	146,753
Total AFS securities	$	4,874,648	80,702	(16,057	)	4,939,293

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 OTTI charge is recognized on an AFS security, through the date of the balance sheet. These unrealized gains and losses are recorded in "Accumulated other comprehensive income (loss)" ("AOCI") on the Consolidated Balance Sheets.

(c) The severity of impairment on securities in an unrealized/unrecognized loss position averaged 1% of amortized cost at both June 30, 2017 and December 31, 2016. Quantitative information regarding unrealized losses on our AFS portfolio is provided below.

June 30, 2017	Less than 12 months				12 months or longer			Total
($ in thousands)	Fair Value		Unrealized Losses1		Fair Value	Unrealized Losses1		Fair Value	Unrealized Losses1
AFS fixed income securities:
U.S. government and government agencies	$	12,670	(32	)	—	—		12,670	(32	)
Obligations of states and political subdivisions	107,387		(1,086	)	—	—		107,387	(1,086	)
Corporate securities	72,991		(517	)	2,531	(7	)	75,522	(524	)
CLO and other ABS	156,406		(178	)	—	—		156,406	(178	)
CMBS	42,671		(243	)	—	—		42,671	(243	)
RMBS	179,293		(860	)	449	(6	)	179,742	(866	)
Total AFS fixed income securities	571,418		(2,916	)	2,980	(13	)	574,398	(2,929	)
AFS equity securities:
Common stock	18,423		(987	)	—	—		18,423	(987	)
Total AFS equity securities	18,423		(987	)	—	—		18,423	(987	)
Total AFS	$	589,841	(3,903	)	2,980	(13	)	592,821	(3,916	)

December 31, 2016	Less than 12 months				12 months or longer			Total
($ in thousands)	Fair Value		Unrealized Losses1		Fair Value	Unrealized Losses1		Fair Value	Unrealized Losses1
AFS fixed income securities:
U.S. government and government agencies	$	6,419	(36	)	—	—		6,419	(36	)
Foreign government	13,075		(16	)	—	—		13,075	(16	)
Obligations of states and political subdivisions	306,509		(5,304	)	—	—		306,509	(5,304	)
Corporate securities	462,902		(5,771	)	4,913	(89	)	467,815	(5,860	)
CLO and other ABS	189,795		(354	)	319	(1	)	190,114	(355	)
CMBS	82,492		(1,021	)	1,645	(7	)	84,137	(1,028	)
RMBS	279,480		(2,489	)	8,749	(309	)	288,229	(2,798	)
Total AFS fixed income securities	1,340,672		(14,991	)	15,626	(406	)	1,356,298	(15,397	)
AFS equity securities:
Common stock	11,271		(305	)	—	—		11,271	(305	)
Preferred stock	6,168		(355	)	—	—		6,168	(355	)
Total AFS equity securities	17,439		(660	)	—	—		17,439	(660	)
Total AFS	$	1,358,111	(15,651	)	15,626	(406	)	1,373,737	(16,057	)

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

We do not intend to sell any of the securities in the tables above, nor do we believe we will be required to sell any of these securities. We have also reviewed 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 2016 Annual Report, and have concluded that they are temporarily impaired. 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 June 30, 2017, by contractual maturity, are shown below. Mortgage-backed securities ("MBS") 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 June 30, 2017:

	AFS		HTM
($ in thousands)	Fair Value		Carrying Value	Fair Value
Due in one year or less	$	306,493	34,521	34,898
Due after one year through five years	2,095,055		29,648	31,498
Due after five years through 10 years	2,379,624		8,345	9,144
Due after 10 years	237,550		—	—
Total fixed income securities	$	5,018,722	72,514	75,540

(e) We evaluate the alternative investments and tax credit investments included in our other investments portfolio to determine whether those investments are VIEs and if so, whether consolidation is required. A VIE is an entity that either has equity investors that lack certain essential characteristics of a controlling financial interest or lacks sufficient funds to finance its own activities without financial support provided by other entities. We consider several significant factors in determining if our investments are VIEs and if we are the primary beneficiary, including whether we have: (i) the power to direct activities of the VIE; (ii) the ability to remove the decision maker of the VIE; (iii) the ability to participate in making decisions that are significant to the VIE; and (iv) the obligation to absorb losses and the right to receive benefits that could potentially be significant to the VIE. We have determined that the investments in our other investment portfolio are VIEs, but that we are not the primary beneficiary and therefore, consolidation is not required.

The following table summarizes our other investment portfolio by strategy:

Other Investments	June 30, 2017				December 31, 2016
($ in thousands)	Carrying Value		Remaining Commitment	Maximum Exposure to Loss1	Carrying Value	Remaining Commitment	Maximum Exposure to Loss1
Alternative Investments
Private equity	$	46,945	76,027	122,972	41,135	76,774	117,909
Private credit	29,942		57,391	87,333	28,193	40,613	68,806
Real assets	20,783		31,237	52,020	14,486	22,899	37,385
Total alternative investments	97,670		164,655	262,325	83,814	140,286	224,100
Other securities	18,741		—	18,741	18,583	3,400	21,983
Total other investments	$	116,411	164,655	281,066	102,397	143,686	246,083

¹The maximum exposure to loss includes both the carry value of these investments and the related unfunded commitments. In addition, tax credits that have been previously recognized in Other securities are subject to the risk of recapture, which we do not consider significant. 

We do not have a future obligation to fund losses or debts on behalf of the investments above; however, we are contractually committed to make additional investments up to the remaining commitment outlined above. We have not provided any non-contractual financial support at any time during 2017 or 2016.

For a description of our alternative investment strategies, as well as information regarding redemption, restrictions, and fund liquidations, refer to Note 5. “Investments” in Item 8. “Financial Statements and Supplementary Data.” of our 2016 Annual Report.

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 and six-month periods ended March 31 is included in our Second Quarter and Six Months results. This information is as follows:

Income Statement Information	Quarter ended June 30,					Six Months ended June 30,
($ in millions)	2017			2016		2017		2016
Net investment (loss) income	$	(9.9	)	(4.6	)	(62.4	)	37.0
Realized gains	(70.2		)	193.2		(304.3	)	981.1
Net change in unrealized depreciation	1,418.5			(253.9	)	1,890.0		(1,236.5	)
Net gain	$	1,338.4		(65.3	)	1,523.3		(218.4	)
Selective’s insurance subsidiaries’ other investments gain (loss)	$	5.2		(0.6	)	6.8		(1.7	)

(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 June 30, 2017 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 June 30, 2017:

($ in millions)	FHLBI Collateral		FHLBNY Collateral	State and Regulatory Deposits	Total
U.S. government and government agencies	$	3.1	—	23.9	27.0
Obligations of states and political subdivisions	—		—	2.0	2.0
CMBS	3.6		4.8	—	8.4
RMBS	60.6		51.9	—	112.5
Total pledged as collateral	$	67.3	56.7	25.9	149.9

(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 June 30, 2017 or December 31, 2016.

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

	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017			2016
Fixed income securities	$	37,668		31,753		$	74,559		63,397
Equity securities	1,419			2,204		2,887			4,434
Short-term investments	377			142		627			301
Other investments	5,231			(611	)	6,834			(1,677	)
Investment expenses	(3,265		)	(2,306	)	(6,058		)	(4,504	)
Net investment income earned	$	41,430		31,182		$	78,849		61,951

(i) The following tables summarize OTTI by asset type for the periods indicated:

Second Quarter 2017	Gross		Included in Other Comprehensive Income ("OCI")			Recognized in Earnings
($ in thousands)
AFS fixed income securities:
U.S. government and government agencies	$	2	—			2
Obligations of states and political subdivisions	239		—			239
Corporate securities	381		—			381
CLO and other ABS	62		—			62
CMBS	220		—			220
RMBS	71		(6		)	77
Total AFS fixed income securities	975		(6		)	981
AFS equity securities:
Common stock	46		—			46
Total AFS equity securities	46		—			46
Other Investments	190		—			190
Total OTTI losses	$	1,211	$	(6	)	$	1,217

Second Quarter 2016	Gross		Included in OCI	Recognized in Earnings
($ in thousands)
AFS fixed income securities:
Corporate securities	$	104	—	104
RMBS	98		10	88
Total AFS fixed income securities	202		10	192
AFS equity securities:
Common stock	357		—	357
Total AFS equity securities	357		—	357
Total OTTI losses	$	559	10	549

Six Months 2017	Gross		Included in Other Comprehensive Income ("OCI")			Recognized in Earnings
($ in thousands)
AFS fixed income securities:
U.S. government and government agencies	$	31	—			31
Obligations of states and political subdivisions	612		—			612
Corporate securities	575		—			575
CLO and other ABS	85		—			85
CMBS	670		—			670
RMBS	1,163		(6		)	1,169
Total AFS fixed income securities	3,136		(6		)	3,142
AFS equity securities:
Common stock	1,360		—			1,360
Total AFS equity securities	1,360		—			1,360
Other Investments	190		—			190
Total OTTI losses	$	4,686	$	(6	)	$	4,692

Six Months 2016	Gross		Included in OCI	Recognized in Earnings
($ in thousands)
AFS fixed income securities:
Corporate securities	$	1,077	—	1,077
RMBS	98		10	88
Total AFS fixed income securities	1,175		10	1,165
AFS equity securities:
Common stock	2,974		—	2,974
Preferred stock	3		—	3
Total AFS equity securities	2,977		—	2,977
Total OTTI losses	$	4,152	10	4,142

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 2016 Annual Report.

(j) The components of net realized gains, excluding OTTI charges, for the periods indicated were as follows:

	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
HTM fixed income securities
Gains	$	44		3		44		3
Losses	—			—		(1	)	(1	)
AFS fixed income securities
Gains	2,715			365		6,267		985
Losses	(153		)	(5	)	(1,740	)	(41	)
AFS equity securities
Gains	350			2,171		350		2,501
Losses	—			(220	)	—		(240	)
Other investments
Gains	—			—		480		—
Losses	(5		)	—		(19	)	(4	)
Total net realized gains (excluding OTTI charges)	$	2,951		2,314		5,381		3,203

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 sale of AFS securities were $123.1 million and $88.7 million in Second Quarter 2017 and Second Quarter 2016, respectively, and $723.4 million and $105.9 million in Six Months 2017 and Six Months 2016, respectively. This increase was driven by higher trading volume in our fixed income securities portfolio related to the recent hiring of new external investment managers.

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Indebtedness Indebtedness

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Debt Disclosure [Text Block]

Indebtedness

Our long-term debt balance has not changed since December 31, 2016. However, on February 28, 2017, Selective Insurance Company of America ("SICA") borrowed $64 million in short-term funds from the FHLBNY at an interest rate of 0.75%. This borrowing was repaid on March 21, 2017.

For detailed information on our indebtedness, see Note 10. "Indebtedness" in Item 8. "Financial Statements and Supplementary Data." of our 2016 Annual Report.

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Fair Value Measurements

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

Our financial assets are measured at fair value as disclosed on the Consolidated Balance Sheets. The fair values of our long-term debt have improved since December 31, 2016, but not by more than 5% in the aggregate. For a discussion of the fair value and hierarchy of the 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 2016 Annual Report.

The following tables provide quantitative disclosures of our financial assets that were measured at fair value at June 30, 2017 and December 31, 2016:

June 30, 2017			Fair Value Measurements Using
($ in thousands)	Assets Measured at Fair Value at 6/30/2017		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	$	68,003	24,828	43,175	—
Foreign government	18,714		—	18,714	—
Obligations of states and political subdivisions	1,404,766		—	1,404,766	—
Corporate securities	1,821,510		—	1,821,510	—
CLO and other ABS	702,524		—	702,524	—
CMBS	279,205		—	279,205	—
RMBS	724,000		—	724,000	—
Total AFS fixed income securities	5,018,722		24,828	4,993,894	—
AFS equity securities:
Common stock	144,436		135,966	—	8,470
Preferred stock	17,258		17,258	—	—
Total AFS equity securities	161,694		153,224	—	8,470
Total AFS securities	5,180,416		178,052	4,993,894	8,470
Short-term investments	133,706		133,706	—	—
Total assets measured at fair value	$	5,314,122	311,758	4,993,894	8,470

December 31, 2016			Fair Value Measurements Using
($ in thousands)	Assets Measured at Fair Value at 12/31/2016		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	$	77,333	27,520	49,813	—
Foreign government	26,865		—	26,865	—
Obligations of states and political subdivisions	1,379,593		—	1,379,593	—
Corporate securities	1,997,753		—	1,997,753	—
CLO and other ABS	528,960		—	528,960	—
CMBS	256,842		—	256,842	—
RMBS	525,194		—	525,194	—
Total AFS fixed income securities	4,792,540		27,520	4,765,020	—
AFS equity securities:
Common stock	130,608		122,932	—	7,676
Preferred stock	16,145		16,145	—	—
Total AFS equity securities	146,753		139,077	—	7,676
Total AFS securities	4,939,293		166,597	4,765,020	7,676
Short-term investments	221,701		221,701	—	—
Total assets measured at fair value	$	5,160,994	388,298	4,765,020	7,676

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

There were no material changes in the fair value of securities measured using Level 3 inputs since December 31, 2016.

The following tables provide quantitative information regarding our financial assets and liabilities that were disclosed at fair value at June 30, 2017 and December 31, 2016:

June 30, 2017			Fair Value Measurements Using
($ in thousands)	Assets/ Liabilities Disclosed at Fair Value at 6/30/2017		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	$	55,622	—	55,622	—
Corporate securities	19,918		—	13,960	5,958
Total HTM fixed income securities	$	75,540	—	69,582	5,958
Financial Liabilities
Long-term debt:
7.25% Senior Notes	$	58,690	—	58,690	—
6.70% Senior Notes	112,573		—	112,573	—
5.875% Senior Notes	188,767		188,767	—	—
1.61% borrowings from FHLBNY	24,521		—	24,521	—
1.56% borrowings from FHLBNY	24,462		—	24,462	—
3.03% borrowings from FHLBI	60,837		—	60,837	—
Total long-term debt	$	469,850	188,767	281,083	—

December 31, 2016			Fair Value Measurements Using
($ in thousands)	Assets/ Liabilities Disclosed at Fair Value at 12/31/2016		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	$	79,916	—	79,916	—
Corporate securities	24,075		—	16,565	7,510
CMBS	1,220		—	1,220	—
Total HTM fixed income securities	$	105,211	—	97,701	7,510
Financial Liabilities
Long-term debt:
7.25% Senior Notes	$	56,148	—	56,148	—
6.70% Senior Notes	108,333		—	108,333	—
5.875% Senior Notes	176,860		176,860	—	—
1.61% borrowings from FHLBNY	24,286		—	24,286	—
1.56% borrowings from FHLBNY	24,219		—	24,219	—
3.03% borrowings from FHLBI	59,313		—	59,313	—
Total long-term debt	$	449,159	176,860	272,299	—

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Reinsurance

6 Months Ended

Jun. 30, 2017

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 2016 Annual Report.

	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Premiums written:
Direct	$	706,408		665,862		1,390,228		1,312,140
Assumed	6,488			7,788		12,179		14,108
Ceded	(99,082		)	(95,510	)	(189,889	)	(182,749	)
Net	$	613,814		578,140		1,212,518		1,143,499
Premiums earned:
Direct	$	654,588		612,406		1,301,316		1,219,067
Assumed	6,063			7,171		11,842		13,441
Ceded	(92,621		)	(87,645	)	(184,274	)	(178,118	)
Net	$	568,030		531,932		1,128,884		1,054,390
Loss and loss expense incurred:
Direct	$	389,550		362,064		731,672		723,703
Assumed	7,766			6,140		12,203		12,495
Ceded	(55,757		)	(69,725	)	(84,844	)	(140,575	)
Net	$	341,559		298,479		659,031		595,623

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 June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Ceded premiums written	$	(63,808	)	(63,906	)	(120,142	)	(117,154	)
Ceded premiums earned	(57,655		)	(56,667	)	(114,932	)	(113,481	)
Ceded loss and loss expense incurred	(15,140		)	(24,261	)	(21,681	)	(64,979	)

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Reserve for Losses and Loss Expenses Reserves for Losses and Loss Expenses

6 Months Ended

Jun. 30, 2017

Insurance Loss Reserves [Abstract]

Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block]

Reserves for Losses and Loss Expenses

The table below provides a roll forward of reserves for losses and loss expenses for beginning and ending reserve balances:

	Six Months ended June 30,
($ in thousands)	2017			2016
Gross reserves for losses and loss expenses, at beginning of year	$	3,691,719		3,517,728
Less: reinsurance recoverable on unpaid losses and loss expenses, at beginning of year	611,200			551,019
Net reserves for losses and loss expenses, at beginning of year	3,080,519			2,966,709
Incurred losses and loss expenses for claims occurring in the:
Current year	684,877			624,159
Prior years	(25,846		)	(28,536	)
Total incurred losses and loss expenses	659,031			595,623
Paid losses and loss expenses for claims occurring in the:
Current year	171,724			146,849
Prior years	425,521			402,255
Total paid losses and loss expenses	597,245			549,104
Net reserves for losses and loss expenses, at end of period	3,142,305			3,013,228
Add: Reinsurance recoverable on unpaid losses and loss expenses, at end of period	588,916			576,941
Gross reserves for losses and loss expenses at end of period	$	3,731,221		3,590,169

Prior year development in Six Months 2017 of $25.8 million was primarily driven by favorable prior year casualty reserve development of $37.4 million in our general liability line of business and $15.3 million in our workers compensation line of business. This was partially offset by unfavorable casualty reserve development of $21.0 million in our commercial automobile line of business and $4.0 million in our personal automobile line of business.

Prior year development in Six Months 2016 of $28.5 million was primarily due to favorable casualty reserve development of $22.0 million in our general liability line of business and $21.0 million in our workers compensation line of business. This was partially offset by unfavorable casualty reserve development of $13.0 million in our commercial automobile line of business and $3.0 million in our E&S segment.

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Segment Information

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Segment Information

Segment Information

The disaggregated results of our four reportable segments are used by senior management to manage our operations. These reportable segments are evaluated as follows:

• Our Standard Commercial Lines, Standard Personal Lines, and Excess and Surplus ("E&S") Lines are evaluated based on statutory underwriting results (net premiums earned, incurred losses and loss expenses, policyholder dividends, policy acquisition costs, and other underwriting expenses), and statutory combined ratios.

• Our Investments segment is evaluated based on after-tax net investment income and net realized gains and losses.

In computing the results of each segment, we do not make adjustments for interest expense or net general corporate expenses; however, we do partially allocate taxes to various segments. Furthermore, 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 gains on investments in the case of the Investments segment) and pre-tax income for the individual segments:

Revenue by Segment	Quarter ended June 30,			Six Months ended June 30,
($ in thousands)	2017		2016	2017	2016
Standard Commercial Lines:
Net premiums earned:
Commercial automobile	$	108,316	98,896	215,445	194,315
Workers compensation	79,460		75,251	158,786	151,251
General liability	141,503		129,283	281,487	257,368
Commercial property	78,052		73,591	154,443	143,769
Businessowners’ policies	24,989		24,651	49,834	48,555
Bonds	6,986		5,665	13,484	11,129
Other	4,288		3,940	8,529	7,779
Miscellaneous income	3,016		3,567	5,876	4,257
Total Standard Commercial Lines revenue	446,610		414,844	887,884	818,423
Standard Personal Lines:
Net premiums earned:
Personal automobile	37,663		35,881	74,613	71,661
Homeowners	32,467		33,411	65,167	66,311
Other	1,542		1,532	3,093	3,057
Miscellaneous income	275		301	656	561
Total Standard Personal Lines revenue	71,947		71,125	143,529	141,590
E&S Lines:
Net premiums earned:
Commercial liability	39,054		36,940	76,966	73,796
Commercial property	13,710		12,891	27,037	25,399
Miscellaneous income	—		—	—	1
Total E&S Lines revenue	52,764		49,831	104,003	99,196
Investments:
Net investment income	41,430		31,182	78,849	61,951
Net realized investment gains (losses)	1,734		1,765	689	(939	)
Total Investments revenue	43,164		32,947	79,538	61,012
Total revenues	$	614,485	568,747	1,214,954	1,120,221

Income Before Federal Income Tax	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Standard Commercial Lines:
Underwriting gain	$	34,759		40,173		77,305		71,105
GAAP combined ratio	92.2		%	90.2		91.2		91.3
Statutory combined ratio	90.6			88.6		89.5		89.1
Standard Personal Lines:
Underwriting (loss) gain	$	(5,768	)	6,125		(662	)	14,730
GAAP combined ratio	108.0		%	91.4		100.5		89.6
Statutory combined ratio	105.9			89.9		99.8		90.1
E&S Lines:
Underwriting gain (loss)	$	1,319		(2,521	)	2,889		(1,103	)
GAAP combined ratio	97.5		%	105.1		97.2		101.1
Statutory combined ratio	97.0			102.7		96.5		100.6
Investments:
Net investment income	$	41,430		31,182		78,849		61,951
Net realized investment losses	1,734			1,765		689		(939	)
Total investment income, before federal income tax	43,164			32,947		79,538		61,012
Tax on investment income	11,734			8,275		21,336		14,538
Total investment income, after federal income tax	$	31,430		24,672		58,202		46,474

Reconciliation of Segment Results to Income Before Federal Income Tax	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Underwriting gain (loss), before federal income tax
Standard Commercial Lines	$	34,759		40,173		77,305		71,105
Standard Personal Lines	(5,768		)	6,125		(662	)	14,730
E&S Lines	1,319			(2,521	)	2,889		(1,103	)
Investment income, before federal income tax	43,164			32,947		79,538		61,012
Total all segments	73,474			76,724		159,070		145,744
Interest expense	(6,081		)	(5,620	)	(12,187	)	(11,226	)
General corporate and other expenses	(8,464		)	(8,793	)	(20,380	)	(20,332	)
Income, before federal income tax	$	58,929		62,311		126,503		114,186

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Retirement Plans

6 Months Ended

Jun. 30, 2017

Compensation and Retirement Disclosure [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 2016 Annual Report.

The following tables provide information regarding the Pension Plan:

	Pension Plan Quarter ended June 30,					Pension Plan Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Net Periodic Benefit Cost:
Service cost	$	—		—		—		1,606
Interest cost	3,110			3,101		6,221		6,203
Expected return on plan assets	(4,855		)	(3,988	)	(9,709	)	(7,976	)
Amortization of unrecognized net actuarial loss	482			1,481		963		2,961
Total net periodic cost	$	(1,263	)	594		(2,525	)	2,794

	Pension Plan Six Months ended June 30,
	2017		2016
Weighted-Average Expense Assumptions:
Discount rate	4.41	%	4.69	%
Effective interest rate for calculation of service cost	n/a		4.52
Effective interest rate for calculation of interest cost	3.83		4.02
Expected return on plan assets	6.24		6.37
Rate of compensation increase	n/a		4.00

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Comprehensive Income

6 Months Ended

Jun. 30, 2017

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 Second Quarter and Six Months2017 and 2016 are as follows:

Second Quarter 2017
($ in thousands)	Gross			Tax		Net
Net income	$	58,929		17,503		41,426
Components of OCI:
Unrealized gains on investment securities:
Unrealized holding gains during period	35,887			12,561		23,326
Non-credit portion of OTTI recognized in OCI	6			2		4
Amounts reclassified into net income:
HTM securities	(43		)	(15	)	(28	)
Realized gains on AFS securities	(1,885		)	(660	)	(1,225	)
Total unrealized gains on investment securities	33,965			11,888		22,077
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	508			178		330
Total defined benefit pension and post-retirement plans	508			178		330
Other comprehensive income	34,473			12,066		22,407
Comprehensive income	$	93,402		29,569		63,833

Second Quarter 2016
($ in thousands)	Gross			Tax		Net
Net income	$	62,311		18,710		43,601
Components of OCI:
Unrealized gains on investment securities:
Unrealized holding gains during period	55,675			19,487		36,188
Non-credit portion of OTTI recognized in OCI	(10		)	(4	)	(6	)
Amounts reclassified into net income:
HTM securities	(19		)	(7	)	(12	)
Realized gains on AFS securities	(1,762		)	(617	)	(1,145	)
Total unrealized gains on investment securities	53,884			18,859		35,025
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	1,517			532		985
Total defined benefit pension and post-retirement plans	1,517			532		985
Other comprehensive income	55,401			19,391		36,010
Comprehensive income	$	117,712		38,101		79,611

Six Months 2017
($ in thousands)	Gross			Tax		Net
Net income	$	126,503		34,637		91,866
Components of OCI:
Unrealized gains on investment securities:
Unrealized holding gains during period	61,672			21,585		40,087
Non-credit portion of OTTI recognized in OCI	6			2		4
Amounts reclassified into net income:
HTM securities	(92		)	(32	)	(60	)
Realized gains on AFS securities	(375		)	(131	)	(244	)
Total unrealized gains on investment securities	61,211			21,424		39,787
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	1,015			355		660
Total defined benefit pension and post-retirement plans	1,015			355		660
Other comprehensive income	62,226			21,779		40,447
Comprehensive income	$	188,729		56,416		132,313

Six Months 2016
($ in thousands)	Gross			Tax		Net
Net income	$	114,186		33,553		80,633
Components of OCI:
Unrealized gains on investment securities:
Unrealized holding gains during period	121,412			42,495		78,917
Non-credit portion of OTTI recognized in OCI	(10		)	(4	)	(6	)
Amounts reclassified into net income:
HTM securities	(91		)	(32	)	(59	)
Realized losses on AFS securities	937			328		609
Total unrealized gains on investment securities	122,248			42,787		79,461
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	3,033			1,062		1,971
Total defined benefit pension and post-retirement plans	3,033			1,062		1,971
Other comprehensive income	125,281			43,849		81,432
Comprehensive income	$	239,467		77,402		162,065

The balances of, and changes in, each component of AOCI (net of taxes) as of June 30, 2017 were as follows:

June 30, 2017										Defined Benefit Pension and Post-Retirement Plans
	Net Unrealized Gain on Investment Securities											Total AOCI
($ in thousands)	OTTI Related			HTM Related		All Other		Investments Subtotal
Balance, December 31, 2016	$	(150	)	102		42,170		42,122		(58,072	)	(15,950	)
OCI before reclassifications	4			—		40,087		40,091		—		40,091
Amounts reclassified from AOCI	—			(60	)	(244	)	(304	)	660		356
Net current period OCI	4			(60	)	39,843		39,787		660		40,447
Balance, June 30, 2017	$	(146	)	42		82,013		81,909		(57,412	)	24,497

The reclassifications out of AOCI were as follows:

	Quarter ended June 30,					Six Months ended June 30,				Affected Line Item in the Unaudited Consolidated Statement of Income
($ in thousands)	2017			2016		2017		2016
HTM related
Unrealized losses on HTM disposals	17			60		30		88		Net realized gains (losses)
Amortization of net unrealized gains on HTM securities	(60		)	(79	)	(122	)	(179	)	Net investment income earned
	(43		)	(19	)	(92	)	(91	)	Income before federal income tax
	15			7		32		32		Total federal income tax expense
	(28		)	(12	)	(60	)	(59	)	Net income
Realized (gains) losses on AFS and OTTI
Realized (gains) losses on AFS disposals and OTTI	(1,885		)	(1,762	)	(375	)	937		Net realized gains (losses)
	(1,885		)	(1,762	)	(375	)	937		Income before federal income tax
	660			617		131		(328	)	Total federal income tax expense
	(1,225		)	(1,145	)	(244	)	609		Net income
Defined benefit pension and post-retirement life plans
Net actuarial loss	111			329		221		658		Losses and loss expenses incurred
	397			1,188		794		2,375		Policy acquisition costs
Total defined benefit pension and post-retirement life	508			1,517		1,015		3,033		Income before federal income tax
	(178		)	(532	)	(355	)	(1,062	)	Total federal income tax expense
	330			985		660		1,971		Net income
Total reclassifications for the period	$	(923	)	(172	)	356		2,521		Net income

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Related Party Transactions Related Party Transactions

6 Months Ended

Jun. 30, 2017

Related Party Transaction [Line Items]

Related Party Transactions Disclosure [Text Block]

Related Party Transactions

BlackRock, Inc., a leading publicly traded investment management firm (“BlackRock”), has purchased our common shares in the ordinary course of its investment business and has previously filed Schedules 13G/A with the SEC. On April 10, 2017, BlackRock filed a Schedule 13G/A reporting beneficial ownership as of March 31, 2017, of 12.7% of our common stock. In connection with purchasing our common shares, BlackRock filed the necessary filings with insurance regulatory authorities. On the basis of those filings, BlackRock is deemed not to be a controlling person for the purposes of applicable insurance law.

We are required to disclose related party information for our transactions with BlackRock. BlackRock is highly regulated, serves its clients as a fiduciary, and has a diverse platform of active (alpha) and index (beta) investment strategies across asset classes that enables it to tailor investment outcomes and asset allocation solutions for clients. BlackRock also offers the BlackRock Solutions^® investment and risk management technology platform, Aladdin^®, risk analytics, advisory and technology services and solutions to a broad base of institutional and wealth management investors. In Second Quarter 2017 and Six Months 2017, we incurred BlackRock-related expenses of $0.5 million and $1.0 million for services rendered, respectively. No material expenses were incurred with BlackRock in Second Quarter 2016 and Six Months 2016. Amounts payable for such services at June 30, 2017 and December 31, 2016, were $0.9 million and $0.4 million, respectively. All contracts with BlackRock were consummated in the ordinary course of business on an arm's-length basis.

We have no additional material transactions with related parties other than those disclosed in Note 16. "Related Party Transactions" included in Item 8. "Financial Statements and Supplementary Data." of our 2016 Annual Report.

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Litigation

6 Months Ended

Jun. 30, 2017

Loss Contingency, Information about Litigation Matters [Abstract]

Litigation

Litigation

In the ordinary course of conducting business, we are named as defendants in various legal proceedings. Most of these proceedings are claims litigation involving our ten insurance subsidiaries ("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 losses and loss expense reserves. We expect that any potential ultimate liability in such ordinary course claims litigation will not be material to our consolidated financial condition, results of operations, or cash flows after consideration of provisions made for potential losses and costs of defense.

From time to time, our Insurance Subsidiaries also are named as defendants in other legal actions, some of which assert claims for substantial amounts. These actions include, among others, putative class actions seeking certification of a state or national class. Such putative class actions have alleged, for example, improper reimbursement of medical providers paid under workers compensation and personal and commercial automobile insurance policies. Similarly, our Insurance Subsidiaries are also named from time-to-time in individual actions seeking extra-contractual damages, punitive damages, or penalties, some of which allege bad faith in the handling of insurance claims. We believe that we have valid defenses to these cases. We expect that any potential ultimate liability in any such lawsuit will not be material to our consolidated financial condition, after consideration of provisions made for estimated losses. Nonetheless, given the inherent unpredictability of litigation and the large or indeterminate amounts sought in certain of these actions, an adverse outcome in certain matters could possibly have a material adverse effect on our consolidated results of operations or cash flows in particular quarterly or annual periods.

As of June 30, 2017, we do not believe the Company was involved in any legal action that could have a material adverse effect on our consolidated financial condition, results of operations, or cash flows.

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Statements of Cash Flow (Tables)

6 Months Ended

Jun. 30, 2017

Supplemental Cash Flow Information [Abstract]

Schedule of Cash Flow, Supplemental Disclosures

	Six Months ended June 30,
($ in thousands)	2017		2016
Cash paid during the period for:
Interest	$	11,963	10,986
Federal income tax	27,000		29,000
Non-cash items:
Exchange of fixed income securities, AFS	1,029		17,702
Corporate actions related to equity securities, AFS1	—		3,032
Assets acquired under capital lease arrangements	278		2,999
Non-cash purchase of property and equipment	—		577

¹Examples of such corporate actions include non-cash acquisitions and stock splits.

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Investments (Tables)

6 Months Ended

Jun. 30, 2017

Investments [Line Items]

Schedule of Held-to-maturity Securities

June 30, 2017
($ in thousands)	Amortized Cost		Net  Unrealized Gains  (Losses)		Carrying Value	Unrecognized  Holding Gains	Unrecognized Holding  Losses	Fair Value
Obligations of states and political subdivisions	$	53,734	185		53,919	1,703	—	55,622
Corporate securities	18,714		(119	)	18,595	1,323	—	19,918
Total HTM fixed income securities	$	72,448	66		72,514	3,026	—	75,540

December 31, 2016
($ in thousands)	Amortized Cost		Net  Unrealized Gains  (Losses)		Carrying Value	Unrecognized  Holding Gains	Unrecognized Holding  Losses		Fair Value
Obligations of states and political subdivisions	$	77,466	317		77,783	2,133	—		79,916
Corporate securities	22,711		(143	)	22,568	1,665	(158	)	24,075
Commercial mortgage-backed securities ("CMBS")	1,220		(15	)	1,205	15	—		1,220
Total HTM fixed income securities	$	101,397	159		101,556	3,813	(158	)	105,211

Schedule of Available-for-sale Securities

June 30, 2017
($ in thousands)	Cost/ Amortized Cost		Unrealized Gains	Unrealized Losses		Fair Value
AFS fixed income securities:
U.S. government and government agencies	$	66,932	1,103	(32	)	68,003
Foreign government	18,157		557	—		18,714
Obligations of states and political subdivisions	1,360,211		45,641	(1,086	)	1,404,766
Corporate securities	1,782,993		39,041	(524	)	1,821,510
Collateralized loan obligations and other asset-backed securities ("CLO and other ABS")	698,594		4,108	(178	)	702,524
CMBS	277,320		2,128	(243	)	279,205
Residential mortgage-backed securities (“RMBS”)	718,798		6,068	(866	)	724,000
Total AFS fixed income securities	4,923,005		98,646	(2,929	)	5,018,722
AFS equity securities:
Common stock	115,315		30,108	(987	)	144,436
Preferred stock	16,148		1,110	—		17,258
Total AFS equity securities	131,463		31,218	(987	)	161,694
Total AFS securities	$	5,054,468	129,864	(3,916	)	5,180,416

December 31, 2016
($ in thousands)	Cost/ Amortized Cost		Unrealized Gains	Unrealized Losses		Fair Value
AFS fixed income securities:
U.S. government and government agencies	$	75,139	2,230	(36	)	77,333
Foreign government	26,559		322	(16	)	26,865
Obligations of states and political subdivisions	1,366,287		18,610	(5,304	)	1,379,593
Corporate securities	1,976,556		27,057	(5,860	)	1,997,753
CLO and other ABS	527,876		1,439	(355	)	528,960
CMBS	256,356		1,514	(1,028	)	256,842
RMBS	524,986		3,006	(2,798	)	525,194
Total AFS fixed income securities	4,753,759		54,178	(15,397	)	4,792,540
AFS equity securities:
Common stock	104,663		26,250	(305	)	130,608
Preferred stock	16,226		274	(355	)	16,145
Total AFS equity securities	120,889		26,524	(660	)	146,753
Total AFS securities	$	4,874,648	80,702	(16,057	)	4,939,293

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

June 30, 2017	Less than 12 months				12 months or longer			Total
($ in thousands)	Fair Value		Unrealized Losses1		Fair Value	Unrealized Losses1		Fair Value	Unrealized Losses1
AFS fixed income securities:
U.S. government and government agencies	$	12,670	(32	)	—	—		12,670	(32	)
Obligations of states and political subdivisions	107,387		(1,086	)	—	—		107,387	(1,086	)
Corporate securities	72,991		(517	)	2,531	(7	)	75,522	(524	)
CLO and other ABS	156,406		(178	)	—	—		156,406	(178	)
CMBS	42,671		(243	)	—	—		42,671	(243	)
RMBS	179,293		(860	)	449	(6	)	179,742	(866	)
Total AFS fixed income securities	571,418		(2,916	)	2,980	(13	)	574,398	(2,929	)
AFS equity securities:
Common stock	18,423		(987	)	—	—		18,423	(987	)
Total AFS equity securities	18,423		(987	)	—	—		18,423	(987	)
Total AFS	$	589,841	(3,903	)	2,980	(13	)	592,821	(3,916	)

December 31, 2016	Less than 12 months				12 months or longer			Total
($ in thousands)	Fair Value		Unrealized Losses1		Fair Value	Unrealized Losses1		Fair Value	Unrealized Losses1
AFS fixed income securities:
U.S. government and government agencies	$	6,419	(36	)	—	—		6,419	(36	)
Foreign government	13,075		(16	)	—	—		13,075	(16	)
Obligations of states and political subdivisions	306,509		(5,304	)	—	—		306,509	(5,304	)
Corporate securities	462,902		(5,771	)	4,913	(89	)	467,815	(5,860	)
CLO and other ABS	189,795		(354	)	319	(1	)	190,114	(355	)
CMBS	82,492		(1,021	)	1,645	(7	)	84,137	(1,028	)
RMBS	279,480		(2,489	)	8,749	(309	)	288,229	(2,798	)
Total AFS fixed income securities	1,340,672		(14,991	)	15,626	(406	)	1,356,298	(15,397	)
AFS equity securities:
Common stock	11,271		(305	)	—	—		11,271	(305	)
Preferred stock	6,168		(355	)	—	—		6,168	(355	)
Total AFS equity securities	17,439		(660	)	—	—		17,439	(660	)
Total AFS	$	1,358,111	(15,651	)	15,626	(406	)	1,373,737	(16,057	)

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

Schedule of Fixed Maturity Securities By Contractual Maturities

	AFS		HTM
($ in thousands)	Fair Value		Carrying Value	Fair Value
Due in one year or less	$	306,493	34,521	34,898
Due after one year through five years	2,095,055		29,648	31,498
Due after five years through 10 years	2,379,624		8,345	9,144
Due after 10 years	237,550		—	—
Total fixed income securities	$	5,018,722	72,514	75,540

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

Other Investments	June 30, 2017				December 31, 2016
($ in thousands)	Carrying Value		Remaining Commitment	Maximum Exposure to Loss1	Carrying Value	Remaining Commitment	Maximum Exposure to Loss1
Alternative Investments
Private equity	$	46,945	76,027	122,972	41,135	76,774	117,909
Private credit	29,942		57,391	87,333	28,193	40,613	68,806
Real assets	20,783		31,237	52,020	14,486	22,899	37,385
Total alternative investments	97,670		164,655	262,325	83,814	140,286	224,100
Other securities	18,741		—	18,741	18,583	3,400	21,983
Total other investments	$	116,411	164,655	281,066	102,397	143,686	246,083

¹The maximum exposure to loss includes both the carry value of these investments and the related unfunded commitments. In addition, tax credits that have been previously recognized in Other securities are subject to the risk of recapture, which we do not consider significant. 

Schedule of Aggregated Summarized Income Statement Financial Information For Partnerships In Our Alternative Investment Portfolio

Income Statement Information	Quarter ended June 30,					Six Months ended June 30,
($ in millions)	2017			2016		2017		2016
Net investment (loss) income	$	(9.9	)	(4.6	)	(62.4	)	37.0
Realized gains	(70.2		)	193.2		(304.3	)	981.1
Net change in unrealized depreciation	1,418.5			(253.9	)	1,890.0		(1,236.5	)
Net gain	$	1,338.4		(65.3	)	1,523.3		(218.4	)
Selective’s insurance subsidiaries’ other investments gain (loss)	$	5.2		(0.6	)	6.8		(1.7	)

Schedule of Securities Pledged As Collateral

($ in millions)	FHLBI Collateral		FHLBNY Collateral	State and Regulatory Deposits	Total
U.S. government and government agencies	$	3.1	—	23.9	27.0
Obligations of states and political subdivisions	—		—	2.0	2.0
CMBS	3.6		4.8	—	8.4
RMBS	60.6		51.9	—	112.5
Total pledged as collateral	$	67.3	56.7	25.9	149.9

Schedule of Net Investment Income Earned

	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017			2016
Fixed income securities	$	37,668		31,753		$	74,559		63,397
Equity securities	1,419			2,204		2,887			4,434
Short-term investments	377			142		627			301
Other investments	5,231			(611	)	6,834			(1,677	)
Investment expenses	(3,265		)	(2,306	)	(6,058		)	(4,504	)
Net investment income earned	$	41,430		31,182		$	78,849		61,951

Schedule of OTTI By Asset Type

Second Quarter 2017	Gross		Included in Other Comprehensive Income ("OCI")			Recognized in Earnings
($ in thousands)
AFS fixed income securities:
U.S. government and government agencies	$	2	—			2
Obligations of states and political subdivisions	239		—			239
Corporate securities	381		—			381
CLO and other ABS	62		—			62
CMBS	220		—			220
RMBS	71		(6		)	77
Total AFS fixed income securities	975		(6		)	981
AFS equity securities:
Common stock	46		—			46
Total AFS equity securities	46		—			46
Other Investments	190		—			190
Total OTTI losses	$	1,211	$	(6	)	$	1,217

Second Quarter 2016	Gross		Included in OCI	Recognized in Earnings
($ in thousands)
AFS fixed income securities:
Corporate securities	$	104	—	104
RMBS	98		10	88
Total AFS fixed income securities	202		10	192
AFS equity securities:
Common stock	357		—	357
Total AFS equity securities	357		—	357
Total OTTI losses	$	559	10	549

Six Months 2017	Gross		Included in Other Comprehensive Income ("OCI")			Recognized in Earnings
($ in thousands)
AFS fixed income securities:
U.S. government and government agencies	$	31	—			31
Obligations of states and political subdivisions	612		—			612
Corporate securities	575		—			575
CLO and other ABS	85		—			85
CMBS	670		—			670
RMBS	1,163		(6		)	1,169
Total AFS fixed income securities	3,136		(6		)	3,142
AFS equity securities:
Common stock	1,360		—			1,360
Total AFS equity securities	1,360		—			1,360
Other Investments	190		—			190
Total OTTI losses	$	4,686	$	(6	)	$	4,692

Six Months 2016	Gross		Included in OCI	Recognized in Earnings
($ in thousands)
AFS fixed income securities:
Corporate securities	$	1,077	—	1,077
RMBS	98		10	88
Total AFS fixed income securities	1,175		10	1,165
AFS equity securities:
Common stock	2,974		—	2,974
Preferred stock	3		—	3
Total AFS equity securities	2,977		—	2,977
Total OTTI losses	$	4,152	10	4,142

Schedule of Components of Net Realized Gains Excluding OTTI Charges

	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
HTM fixed income securities
Gains	$	44		3		44		3
Losses	—			—		(1	)	(1	)
AFS fixed income securities
Gains	2,715			365		6,267		985
Losses	(153		)	(5	)	(1,740	)	(41	)
AFS equity securities
Gains	350			2,171		350		2,501
Losses	—			(220	)	—		(240	)
Other investments
Gains	—			—		480		—
Losses	(5		)	—		(19	)	(4	)
Total net realized gains (excluding OTTI charges)	$	2,951		2,314		5,381		3,203

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2017

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

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

June 30, 2017			Fair Value Measurements Using
($ in thousands)	Assets Measured at Fair Value at 6/30/2017		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	$	68,003	24,828	43,175	—
Foreign government	18,714		—	18,714	—
Obligations of states and political subdivisions	1,404,766		—	1,404,766	—
Corporate securities	1,821,510		—	1,821,510	—
CLO and other ABS	702,524		—	702,524	—
CMBS	279,205		—	279,205	—
RMBS	724,000		—	724,000	—
Total AFS fixed income securities	5,018,722		24,828	4,993,894	—
AFS equity securities:
Common stock	144,436		135,966	—	8,470
Preferred stock	17,258		17,258	—	—
Total AFS equity securities	161,694		153,224	—	8,470
Total AFS securities	5,180,416		178,052	4,993,894	8,470
Short-term investments	133,706		133,706	—	—
Total assets measured at fair value	$	5,314,122	311,758	4,993,894	8,470

December 31, 2016			Fair Value Measurements Using
($ in thousands)	Assets Measured at Fair Value at 12/31/2016		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	$	77,333	27,520	49,813	—
Foreign government	26,865		—	26,865	—
Obligations of states and political subdivisions	1,379,593		—	1,379,593	—
Corporate securities	1,997,753		—	1,997,753	—
CLO and other ABS	528,960		—	528,960	—
CMBS	256,842		—	256,842	—
RMBS	525,194		—	525,194	—
Total AFS fixed income securities	4,792,540		27,520	4,765,020	—
AFS equity securities:
Common stock	130,608		122,932	—	7,676
Preferred stock	16,145		16,145	—	—
Total AFS equity securities	146,753		139,077	—	7,676
Total AFS securities	4,939,293		166,597	4,765,020	7,676
Short-term investments	221,701		221,701	—	—
Total assets measured at fair value	$	5,160,994	388,298	4,765,020	7,676

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

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

June 30, 2017			Fair Value Measurements Using
($ in thousands)	Assets/ Liabilities Disclosed at Fair Value at 6/30/2017		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	$	55,622	—	55,622	—
Corporate securities	19,918		—	13,960	5,958
Total HTM fixed income securities	$	75,540	—	69,582	5,958
Financial Liabilities
Long-term debt:
7.25% Senior Notes	$	58,690	—	58,690	—
6.70% Senior Notes	112,573		—	112,573	—
5.875% Senior Notes	188,767		188,767	—	—
1.61% borrowings from FHLBNY	24,521		—	24,521	—
1.56% borrowings from FHLBNY	24,462		—	24,462	—
3.03% borrowings from FHLBI	60,837		—	60,837	—
Total long-term debt	$	469,850	188,767	281,083	—

December 31, 2016			Fair Value Measurements Using
($ in thousands)	Assets/ Liabilities Disclosed at Fair Value at 12/31/2016		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	$	79,916	—	79,916	—
Corporate securities	24,075		—	16,565	7,510
CMBS	1,220		—	1,220	—
Total HTM fixed income securities	$	105,211	—	97,701	7,510
Financial Liabilities
Long-term debt:
7.25% Senior Notes	$	56,148	—	56,148	—
6.70% Senior Notes	108,333		—	108,333	—
5.875% Senior Notes	176,860		176,860	—	—
1.61% borrowings from FHLBNY	24,286		—	24,286	—
1.56% borrowings from FHLBNY	24,219		—	24,219	—
3.03% borrowings from FHLBI	59,313		—	59,313	—
Total long-term debt	$	449,159	176,860	272,299	—

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Reinsurance (Tables)

6 Months Ended

Jun. 30, 2017

Reinsurance Disclosures [Abstract]

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

	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Premiums written:
Direct	$	706,408		665,862		1,390,228		1,312,140
Assumed	6,488			7,788		12,179		14,108
Ceded	(99,082		)	(95,510	)	(189,889	)	(182,749	)
Net	$	613,814		578,140		1,212,518		1,143,499
Premiums earned:
Direct	$	654,588		612,406		1,301,316		1,219,067
Assumed	6,063			7,171		11,842		13,441
Ceded	(92,621		)	(87,645	)	(184,274	)	(178,118	)
Net	$	568,030		531,932		1,128,884		1,054,390
Loss and loss expense incurred:
Direct	$	389,550		362,064		731,672		723,703
Assumed	7,766			6,140		12,203		12,495
Ceded	(55,757		)	(69,725	)	(84,844	)	(140,575	)
Net	$	341,559		298,479		659,031		595,623

Schedule of Ceded Premiums and Losses Related to Flood Operations

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 June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Ceded premiums written	$	(63,808	)	(63,906	)	(120,142	)	(117,154	)
Ceded premiums earned	(57,655		)	(56,667	)	(114,932	)	(113,481	)
Ceded loss and loss expense incurred	(15,140		)	(24,261	)	(21,681	)	(64,979	)

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Reserve for Losses and Loss Expenses Reserves for Losses and Loss Expenses (Tables)

6 Months Ended

Jun. 30, 2017

Insurance Loss Reserves [Abstract]

Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]

	Six Months ended June 30,
($ in thousands)	2017			2016
Gross reserves for losses and loss expenses, at beginning of year	$	3,691,719		3,517,728
Less: reinsurance recoverable on unpaid losses and loss expenses, at beginning of year	611,200			551,019
Net reserves for losses and loss expenses, at beginning of year	3,080,519			2,966,709
Incurred losses and loss expenses for claims occurring in the:
Current year	684,877			624,159
Prior years	(25,846		)	(28,536	)
Total incurred losses and loss expenses	659,031			595,623
Paid losses and loss expenses for claims occurring in the:
Current year	171,724			146,849
Prior years	425,521			402,255
Total paid losses and loss expenses	597,245			549,104
Net reserves for losses and loss expenses, at end of period	3,142,305			3,013,228
Add: Reinsurance recoverable on unpaid losses and loss expenses, at end of period	588,916			576,941
Gross reserves for losses and loss expenses at end of period	$	3,731,221		3,590,169

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Segment Information (Tables)

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Schedule of Revenue By Segment

Revenue by Segment	Quarter ended June 30,			Six Months ended June 30,
($ in thousands)	2017		2016	2017	2016
Standard Commercial Lines:
Net premiums earned:
Commercial automobile	$	108,316	98,896	215,445	194,315
Workers compensation	79,460		75,251	158,786	151,251
General liability	141,503		129,283	281,487	257,368
Commercial property	78,052		73,591	154,443	143,769
Businessowners’ policies	24,989		24,651	49,834	48,555
Bonds	6,986		5,665	13,484	11,129
Other	4,288		3,940	8,529	7,779
Miscellaneous income	3,016		3,567	5,876	4,257
Total Standard Commercial Lines revenue	446,610		414,844	887,884	818,423
Standard Personal Lines:
Net premiums earned:
Personal automobile	37,663		35,881	74,613	71,661
Homeowners	32,467		33,411	65,167	66,311
Other	1,542		1,532	3,093	3,057
Miscellaneous income	275		301	656	561
Total Standard Personal Lines revenue	71,947		71,125	143,529	141,590
E&S Lines:
Net premiums earned:
Commercial liability	39,054		36,940	76,966	73,796
Commercial property	13,710		12,891	27,037	25,399
Miscellaneous income	—		—	—	1
Total E&S Lines revenue	52,764		49,831	104,003	99,196
Investments:
Net investment income	41,430		31,182	78,849	61,951
Net realized investment gains (losses)	1,734		1,765	689	(939	)
Total Investments revenue	43,164		32,947	79,538	61,012
Total revenues	$	614,485	568,747	1,214,954	1,120,221

Income Before Federal Income Tax	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Standard Commercial Lines:
Underwriting gain	$	34,759		40,173		77,305		71,105
GAAP combined ratio	92.2		%	90.2		91.2		91.3
Statutory combined ratio	90.6			88.6		89.5		89.1
Standard Personal Lines:
Underwriting (loss) gain	$	(5,768	)	6,125		(662	)	14,730
GAAP combined ratio	108.0		%	91.4		100.5		89.6
Statutory combined ratio	105.9			89.9		99.8		90.1
E&S Lines:
Underwriting gain (loss)	$	1,319		(2,521	)	2,889		(1,103	)
GAAP combined ratio	97.5		%	105.1		97.2		101.1
Statutory combined ratio	97.0			102.7		96.5		100.6
Investments:
Net investment income	$	41,430		31,182		78,849		61,951
Net realized investment losses	1,734			1,765		689		(939	)
Total investment income, before federal income tax	43,164			32,947		79,538		61,012
Tax on investment income	11,734			8,275		21,336		14,538
Total investment income, after federal income tax	$	31,430		24,672		58,202		46,474

Schedule of Income Before Federal Income Tax

Income Before Federal Income Tax	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Standard Commercial Lines:
Underwriting gain	$	34,759		40,173		77,305		71,105
GAAP combined ratio	92.2		%	90.2		91.2		91.3
Statutory combined ratio	90.6			88.6		89.5		89.1
Standard Personal Lines:
Underwriting (loss) gain	$	(5,768	)	6,125		(662	)	14,730
GAAP combined ratio	108.0		%	91.4		100.5		89.6
Statutory combined ratio	105.9			89.9		99.8		90.1
E&S Lines:
Underwriting gain (loss)	$	1,319		(2,521	)	2,889		(1,103	)
GAAP combined ratio	97.5		%	105.1		97.2		101.1
Statutory combined ratio	97.0			102.7		96.5		100.6
Investments:
Net investment income	$	41,430		31,182		78,849		61,951
Net realized investment losses	1,734			1,765		689		(939	)
Total investment income, before federal income tax	43,164			32,947		79,538		61,012
Tax on investment income	11,734			8,275		21,336		14,538
Total investment income, after federal income tax	$	31,430		24,672		58,202		46,474

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

Reconciliation of Segment Results to Income Before Federal Income Tax	Quarter ended June 30,					Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Underwriting gain (loss), before federal income tax
Standard Commercial Lines	$	34,759		40,173		77,305		71,105
Standard Personal Lines	(5,768		)	6,125		(662	)	14,730
E&S Lines	1,319			(2,521	)	2,889		(1,103	)
Investment income, before federal income tax	43,164			32,947		79,538		61,012
Total all segments	73,474			76,724		159,070		145,744
Interest expense	(6,081		)	(5,620	)	(12,187	)	(11,226	)
General corporate and other expenses	(8,464		)	(8,793	)	(20,380	)	(20,332	)
Income, before federal income tax	$	58,929		62,311		126,503		114,186

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Retirement Plans (Table)

6 Months Ended

Jun. 30, 2017

Compensation and Retirement Disclosure [Abstract]

Schedule of Components of Net Periodic Benefit Cost

	Pension Plan Quarter ended June 30,					Pension Plan Six Months ended June 30,
($ in thousands)	2017			2016		2017		2016
Net Periodic Benefit Cost:
Service cost	$	—		—		—		1,606
Interest cost	3,110			3,101		6,221		6,203
Expected return on plan assets	(4,855		)	(3,988	)	(9,709	)	(7,976	)
Amortization of unrecognized net actuarial loss	482			1,481		963		2,961
Total net periodic cost	$	(1,263	)	594		(2,525	)	2,794

	Pension Plan Six Months ended June 30,
	2017		2016
Weighted-Average Expense Assumptions:
Discount rate	4.41	%	4.69	%
Effective interest rate for calculation of service cost	n/a		4.52
Effective interest rate for calculation of interest cost	3.83		4.02
Expected return on plan assets	6.24		6.37
Rate of compensation increase	n/a		4.00

Schedule of Weighted-Average Expense Assumptions

	Pension Plan Six Months ended June 30,
	2017		2016
Weighted-Average Expense Assumptions:
Discount rate	4.41	%	4.69	%
Effective interest rate for calculation of service cost	n/a		4.52
Effective interest rate for calculation of interest cost	3.83		4.02
Expected return on plan assets	6.24		6.37
Rate of compensation increase	n/a		4.00

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Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2017

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

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

Second Quarter 2017
($ in thousands)	Gross			Tax		Net
Net income	$	58,929		17,503		41,426
Components of OCI:
Unrealized gains on investment securities:
Unrealized holding gains during period	35,887			12,561		23,326
Non-credit portion of OTTI recognized in OCI	6			2		4
Amounts reclassified into net income:
HTM securities	(43		)	(15	)	(28	)
Realized gains on AFS securities	(1,885		)	(660	)	(1,225	)
Total unrealized gains on investment securities	33,965			11,888		22,077
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	508			178		330
Total defined benefit pension and post-retirement plans	508			178		330
Other comprehensive income	34,473			12,066		22,407
Comprehensive income	$	93,402		29,569		63,833

Second Quarter 2016
($ in thousands)	Gross			Tax		Net
Net income	$	62,311		18,710		43,601
Components of OCI:
Unrealized gains on investment securities:
Unrealized holding gains during period	55,675			19,487		36,188
Non-credit portion of OTTI recognized in OCI	(10		)	(4	)	(6	)
Amounts reclassified into net income:
HTM securities	(19		)	(7	)	(12	)
Realized gains on AFS securities	(1,762		)	(617	)	(1,145	)
Total unrealized gains on investment securities	53,884			18,859		35,025
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	1,517			532		985
Total defined benefit pension and post-retirement plans	1,517			532		985
Other comprehensive income	55,401			19,391		36,010
Comprehensive income	$	117,712		38,101		79,611

Six Months 2017
($ in thousands)	Gross			Tax		Net
Net income	$	126,503		34,637		91,866
Components of OCI:
Unrealized gains on investment securities:
Unrealized holding gains during period	61,672			21,585		40,087
Non-credit portion of OTTI recognized in OCI	6			2		4
Amounts reclassified into net income:
HTM securities	(92		)	(32	)	(60	)
Realized gains on AFS securities	(375		)	(131	)	(244	)
Total unrealized gains on investment securities	61,211			21,424		39,787
Defined benefit pension and post-retirement plans:
Amounts reclassified into net income:
Net actuarial loss	1,015			355		660
Total defined benefit pension and post-retirement plans	1,015			355		660
Other comprehensive income	62,226			21,779		40,447
Comprehensive income	$	188,729		56,416		132,313

Schedule of Components of Accumulated Other Comprehensive Income

June 30, 2017										Defined Benefit Pension and Post-Retirement Plans
	Net Unrealized Gain on Investment Securities											Total AOCI
($ in thousands)	OTTI Related			HTM Related		All Other		Investments Subtotal
Balance, December 31, 2016	$	(150	)	102		42,170		42,122		(58,072	)	(15,950	)
OCI before reclassifications	4			—		40,087		40,091		—		40,091
Amounts reclassified from AOCI	—			(60	)	(244	)	(304	)	660		356
Net current period OCI	4			(60	)	39,843		39,787		660		40,447
Balance, June 30, 2017	$	(146	)	42		82,013		81,909		(57,412	)	24,497

Schedule of Reclassifications Out Of Accumulated Other Comprehensive Income

	Quarter ended June 30,					Six Months ended June 30,				Affected Line Item in the Unaudited Consolidated Statement of Income
($ in thousands)	2017			2016		2017		2016
HTM related
Unrealized losses on HTM disposals	17			60		30		88		Net realized gains (losses)
Amortization of net unrealized gains on HTM securities	(60		)	(79	)	(122	)	(179	)	Net investment income earned
	(43		)	(19	)	(92	)	(91	)	Income before federal income tax
	15			7		32		32		Total federal income tax expense
	(28		)	(12	)	(60	)	(59	)	Net income
Realized (gains) losses on AFS and OTTI
Realized (gains) losses on AFS disposals and OTTI	(1,885		)	(1,762	)	(375	)	937		Net realized gains (losses)
	(1,885		)	(1,762	)	(375	)	937		Income before federal income tax
	660			617		131		(328	)	Total federal income tax expense
	(1,225		)	(1,145	)	(244	)	609		Net income
Defined benefit pension and post-retirement life plans
Net actuarial loss	111			329		221		658		Losses and loss expenses incurred
	397			1,188		794		2,375		Policy acquisition costs
Total defined benefit pension and post-retirement life	508			1,517		1,015		3,033		Income before federal income tax
	(178		)	(532	)	(355	)	(1,062	)	Total federal income tax expense
	330			985		660		1,971		Net income
Total reclassifications for the period	$	(923	)	(172	)	356		2,521		Net income

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Accounting Pronouncements Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 400		$ 3,300
Unrealized gain on equity securities	$ 24,497		24,497		$ (15,950)
Change in unrealized gains on equity securities, net of tax			$ 3,000
Earnings per share impact	$ 0.70	$ 0.74	$ 1.55	$ 1.38
Equity Securities [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unrealized gain on equity securities					$ 17,000
Earnings per share impact			$ 0.05

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Statements of Cash Flow (Cash Flow Supplemental Disclosures) (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016
Interest		$ 11,963	$ 10,986
Federal income tax		27,000	29,000
Corporate actions related to equity securities, AFS	[1]	0	3,032
Assets acquired under capital lease arrangements		278	2,999
Non-cash purchase of property and equipment		0	577
AFS Fixed Maturity Securities [Member]
Exchange of fixed income securities		1,029	17,702
National Flood Insurance Program [Member]
Restricted cash		$ 8,100	$ 8,900

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

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Investments (Held-To-Maturity Securities Disclosure) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 72,448	$ 101,397
Net Unrealized Gains (Losses)	66	159
Carrying Value	72,514	101,556
Unrecognized Holding Gains	3,026	3,813
Unrecognized Holding Losses	0	(158)
Held-to-maturity Securities, Fair Value	75,540	105,211
Obligations of States and Political Subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	53,734	77,466
Net Unrealized Gains (Losses)	185	317
Carrying Value	53,919	77,783
Unrecognized Holding Gains	1,703	2,133
Unrecognized Holding Losses	0	0
Held-to-maturity Securities, Fair Value	55,622	79,916
Corporate Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	18,714	22,711
Net Unrealized Gains (Losses)	(119)	(143)
Carrying Value	18,595	22,568
Unrecognized Holding Gains	1,323	1,665
Unrecognized Holding Losses	0	(158)
Held-to-maturity Securities, Fair Value	$ 19,918	24,075
Commercial Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		1,220
Net Unrealized Gains (Losses)		(15)
Carrying Value		1,205
Unrecognized Holding Gains		15
Unrecognized Holding Losses		0
Held-to-maturity Securities, Fair Value		$ 1,220

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Investments (Available-For-Sale Securities Disclosure) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	$ 5,054,468	$ 4,874,648
Unrealized Gains	129,864	80,702
Unrealized Losses	(3,916)	(16,057)
Total AFS securities	5,180,416	4,939,293
AFS Fixed Income Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	4,923,005	4,753,759
Unrealized Gains	98,646	54,178
Unrealized Losses	(2,929)	(15,397)
Total AFS securities	5,018,722	4,792,540
AFS Fixed Income Securities [Member] | U.S. Government and Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	66,932	75,139
Unrealized Gains	1,103	2,230
Unrealized Losses	(32)	(36)
Total AFS securities	68,003	77,333
AFS Fixed Income Securities [Member] | Foreign Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	18,157	26,559
Unrealized Gains	557	322
Unrealized Losses	0	(16)
Total AFS securities	18,714	26,865
AFS Fixed Income Securities [Member] | Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	1,360,211	1,366,287
Unrealized Gains	45,641	18,610
Unrealized Losses	(1,086)	(5,304)
Total AFS securities	1,404,766	1,379,593
AFS Fixed Income Securities [Member] | Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	1,782,993	1,976,556
Unrealized Gains	39,041	27,057
Unrealized Losses	(524)	(5,860)
Total AFS securities	1,821,510	1,997,753
AFS Fixed Income Securities [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	698,594	527,876
Unrealized Gains	4,108	1,439
Unrealized Losses	(178)	(355)
Total AFS securities	702,524	528,960
AFS Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	277,320	256,356
Unrealized Gains	2,128	1,514
Unrealized Losses	(243)	(1,028)
Total AFS securities	279,205	256,842
AFS Fixed Income Securities [Member] | Residential Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	718,798	524,986
Unrealized Gains	6,068	3,006
Unrealized Losses	(866)	(2,798)
Total AFS securities	724,000	525,194
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	131,463	120,889
Unrealized Gains	31,218	26,524
Unrealized Losses	(987)	(660)
Total AFS securities	161,694	146,753
Equity Securities [Member] | Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	115,315	104,663
Unrealized Gains	30,108	26,250
Unrealized Losses	(987)	(305)
Total AFS securities	144,436	130,608
Equity Securities [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	16,148	16,226
Unrealized Gains	1,110	274
Unrealized Losses	0	(355)
Total AFS securities	$ 17,258	$ 16,145

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Investments (Fair Value and Gross Pre-Tax Net Unrealized Unrecognized Loss of Securities By Length of Time) (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
AFS Fair Value, Less than 12 months		$ 589,841	$ 1,358,111
AFS Unrealized Losses, Less than 12 months	[1]	(3,903)	(15,651)
AFS Fair Value, 12 months or longer		2,980	15,626
AFS Unrealized Losses, 12 months or longer	[1]	(13)	(406)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		592,821	1,373,737
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[1]	(3,916)	(16,057)
AFS Fixed Income Securities [Member]
AFS Fair Value, Less than 12 months		571,418	1,340,672
AFS Unrealized Losses, Less than 12 months	[1]	(2,916)	(14,991)
AFS Fair Value, 12 months or longer		2,980	15,626
AFS Unrealized Losses, 12 months or longer	[1]	(13)	(406)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		574,398	1,356,298
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[1]	(2,929)	(15,397)
AFS Fixed Income Securities [Member] | U.S. Government and Government Agencies [Member]
AFS Fair Value, Less than 12 months		12,670	6,419
AFS Unrealized Losses, Less than 12 months	[1]	(32)	(36)
AFS Fair Value, 12 months or longer		0	0
AFS Unrealized Losses, 12 months or longer	[1]	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		12,670	6,419
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[1]	(32)	(36)
AFS Fixed Income Securities [Member] | Foreign Government [Member]
AFS Fair Value, Less than 12 months			13,075
AFS Unrealized Losses, Less than 12 months	[1]		(16)
AFS Fair Value, 12 months or longer			0
AFS Unrealized Losses, 12 months or longer	[1]		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value			13,075
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[1]		(16)
AFS Fixed Income Securities [Member] | Obligations of States and Political Subdivisions [Member]
AFS Fair Value, Less than 12 months		107,387	306,509
AFS Unrealized Losses, Less than 12 months	[1]	(1,086)	(5,304)
AFS Fair Value, 12 months or longer		0	0
AFS Unrealized Losses, 12 months or longer	[1]	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		107,387	306,509
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[1]	(1,086)	(5,304)
AFS Fixed Income Securities [Member] | Corporate Securities [Member]
AFS Fair Value, Less than 12 months		72,991	462,902
AFS Unrealized Losses, Less than 12 months	[1]	(517)	(5,771)
AFS Fair Value, 12 months or longer		2,531	4,913
AFS Unrealized Losses, 12 months or longer	[1]	(7)	(89)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		75,522	467,815
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[1]	(524)	(5,860)
AFS Fixed Income Securities [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member]
AFS Fair Value, Less than 12 months		156,406	189,795
AFS Unrealized Losses, Less than 12 months	[1]	(178)	(354)
AFS Fair Value, 12 months or longer		0	319
AFS Unrealized Losses, 12 months or longer	[1]	0	(1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		156,406	190,114
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[1]	(178)	(355)
AFS Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member]
AFS Fair Value, Less than 12 months		42,671	82,492
AFS Unrealized Losses, Less than 12 months	[1]	(243)	(1,021)
AFS Fair Value, 12 months or longer		0	1,645
AFS Unrealized Losses, 12 months or longer	[1]	0	(7)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		42,671	84,137
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[1]	(243)	(1,028)
AFS Fixed Income Securities [Member] | Residential Mortgage Backed Securities [Member]
AFS Fair Value, Less than 12 months		179,293	279,480
AFS Unrealized Losses, Less than 12 months	[1]	(860)	(2,489)
AFS Fair Value, 12 months or longer		449	8,749
AFS Unrealized Losses, 12 months or longer	[1]	(6)	(309)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		179,742	288,229
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[1]	(866)	(2,798)
Equity Securities [Member]
AFS Fair Value, Less than 12 months		18,423	17,439
AFS Unrealized Losses, Less than 12 months	[1]	(987)	(660)
AFS Fair Value, 12 months or longer		0	0
AFS Unrealized Losses, 12 months or longer	[1]	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		18,423	17,439
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[1]	(987)	(660)
Equity Securities [Member] | Common Stock [Member]
AFS Fair Value, Less than 12 months		18,423	11,271
AFS Unrealized Losses, Less than 12 months	[1]	(987)	(305)
AFS Fair Value, 12 months or longer		0	0
AFS Unrealized Losses, 12 months or longer	[1]	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		18,423	11,271
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[1]	$ (987)	(305)
Equity Securities [Member] | Preferred Stock [Member]
AFS Fair Value, Less than 12 months			6,168
AFS Unrealized Losses, Less than 12 months	[1]		(355)
AFS Fair Value, 12 months or longer			0
AFS Unrealized Losses, 12 months or longer	[1]		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value			6,168
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	[1]		$ (355)

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

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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Due in one year or less fair value	$ 306,493
Due after one year through five years fair value	2,095,055
Due after five years through 10 years fair value	2,379,624
Due after ten years fair value	237,550
AFS, Fair Value	5,018,722	$ 4,792,540
Due in one year or less carrying value	34,521
Due after one year through five years carrying value	29,648
Due after five years through 10 years carrying value	8,345
Due after 10 years carrying value	0
Carrying Value	72,514	101,556
Due in one year or less fair value	34,898
Due after one year through five years fair value	31,498
Due after five years through 10 years fair value	9,144
Due after 10 years fair value	0
HTM, Fair Value	$ 75,540	$ 105,211

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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		Jun. 30, 2017	Dec. 31, 2016
Carrying Value		$ 116,411	$ 102,397
Other Investments [Member]
Carrying Value		116,411	102,397
Remaining Commitment		164,655	143,686
Maximum Exposure to Loss	[1]	281,066	246,083
Alternative Investments [Member]
Carrying Value		97,670	83,814
Remaining Commitment		164,655	140,286
Maximum Exposure to Loss	[1]	262,325	224,100
Private Equity [Member] | Alternative Investments [Member]
Carrying Value		46,945	41,135
Remaining Commitment		76,027	76,774
Maximum Exposure to Loss	[1]	122,972	117,909
Private Credit [Member] | Alternative Investments [Member]
Carrying Value		29,942	28,193
Remaining Commitment		57,391	40,613
Maximum Exposure to Loss	[1]	87,333	68,806
Real Assets [Member] | Alternative Investments [Member]
Carrying Value		20,783	14,486
Remaining Commitment		31,237	22,899
Maximum Exposure to Loss	[1]	52,020	37,385
Other Securities [Member]
Carrying Value		18,741	18,583
Remaining Commitment		0	3,400
Maximum Exposure to Loss	[1]	$ 18,741	$ 21,983

[1] The maximum exposure to loss includes both the carry value of these investments and the related unfunded commitments. In addition, tax credits that have been previously recognized in Other securities are subject to the risk of recapture, which we do not consider significant.

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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				6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016
Schedule of Equity Method Investments [Line Items]
Net investment income earned	$ 41,430		$ 31,182		$ 78,849		$ 61,951
Alternative Investments [Member]
Schedule of Equity Method Investments [Line Items]
Net investment income earned	$ 5,200		$ (600)		$ 6,800		$ (1,700)
Investments accounted for under the equity method [Member]
Schedule of Equity Method Investments [Line Items]
Net investment (loss) income		$ (9,900)		$ (4,600)		$ (62,400)		$ 37,000
Realized gains		(70,200)		193,200		(304,300)		981,100
Net change in unrealized depreciation		1,418,500		(253,900)		1,890,000		(1,236,500)
Net gain		$ 1,338,400		$ (65,300)		$ 1,523,300		$ (218,400)

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Investments (Investments Pledged as Collateral) (Details) $ in Millions	Jun. 30, 2017 USD ($)
Investments Pledged As Collateral [Line Items]
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	$ 25.9
Securities Pledged As Collateral	149.9
U.S. Government and Government Agencies [Member]
Investments Pledged As Collateral [Line Items]
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	23.9
Securities Pledged As Collateral	27.0
Obligations of States and Political Subdivisions [Member]
Investments Pledged As Collateral [Line Items]
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	2.0
Securities Pledged As Collateral	2.0
Commercial Mortgage Backed Securities [Member]
Investments Pledged As Collateral [Line Items]
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	0.0
Securities Pledged As Collateral	8.4
Residential Mortgage Backed Securities [Member]
Investments Pledged As Collateral [Line Items]
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	0.0
Securities Pledged As Collateral	112.5
Federal Home Loan Bank of Indianapolis [Member]
Investments Pledged As Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	67.3
Federal Home Loan Bank of Indianapolis [Member] | U.S. Government and Government Agencies [Member]
Investments Pledged As Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	3.1
Federal Home Loan Bank of Indianapolis [Member] | Obligations of States and Political Subdivisions [Member]
Investments 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]
Investments Pledged As Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	3.6
Federal Home Loan Bank of Indianapolis [Member] | Residential Mortgage Backed Securities [Member]
Investments Pledged As Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	60.6
Federal Home Loan Bank of New York [Member]
Investments Pledged As Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	56.7
Federal Home Loan Bank of New York [Member] | U.S. Government and Government Agencies [Member]
Investments 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]
Investments 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]
Investments Pledged As Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	4.8
Federal Home Loan Bank of New York [Member] | Residential Mortgage Backed Securities [Member]
Investments Pledged As Collateral [Line Items]
Fixed Income Securities Pledged For FHLB Collateral	$ 51.9

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Investments (Credit Concentration Risk) (Details)	Jun. 30, 2017	Dec. 31, 2016
Investments [Abstract]
Maximum exposure to credit concentration risk of the Company's stockholder's equity other than certain U.S. government agencies	10.00%	10.00%

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Investments (Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net Investment Income [Line Items]
Net investment income earned	$ 41,430	$ 31,182	$ 78,849	$ 61,951
Fixed Income Securities [Member]
Net Investment Income [Line Items]
Net investment income earned	37,668	31,753	74,559	63,397
Equity Securities [Member]
Net Investment Income [Line Items]
Net investment income earned	1,419	2,204	2,887	4,434
Short-Term Investments [Member]
Net Investment Income [Line Items]
Net investment income earned	377	142	627	301
Other Investments [Member]
Net Investment Income [Line Items]
Net investment income earned	5,231	(611)	6,834	(1,677)
Investment Expenses [Member]
Net Investment Income [Line Items]
Net investment income earned	$ (3,265)	$ (2,306)	$ (6,058)	$ (4,504)

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Investments (OTTI by Asset Type) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
OTTI Losses Gross	$ 1,211	$ 559	$ 4,686	$ 4,152
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	(6)	10	(6)	10
OTTI Losses Recognized in Earnings	1,217	549	4,692	4,142
US Treasury and Government [Member]
OTTI Losses Gross	2		31
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0		0
OTTI Losses Recognized in Earnings	2		31
Obligations of States and Political Subdivisions [Member]
OTTI Losses Gross	239		612
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0		0
OTTI Losses Recognized in Earnings	239		612
Collateralized Loan Obligations and Other Asset Backed Securities [Member]
OTTI Losses Gross	62		85
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0		0
OTTI Losses Recognized in Earnings	62		85
Commercial Mortgage Backed Securities [Member]
OTTI Losses Gross	220		670
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0		0
OTTI Losses Recognized in Earnings	220		670
Other Investments [Member]
OTTI Losses Gross	190		190
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0		0
OTTI Losses Recognized in Earnings	190		190
AFS Fixed Income Securities [Member]
OTTI Losses Gross	975	202	3,136	1,175
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	(6)	10	(6)	10
OTTI Losses Recognized in Earnings	981	192	3,142	1,165
AFS Fixed Income Securities [Member] | Corporate Securities [Member]
OTTI Losses Gross	381	104	575	1,077
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0	0	0	0
OTTI Losses Recognized in Earnings	381	104	575	1,077
AFS Fixed Income Securities [Member] | Residential Mortgage Backed Securities [Member]
OTTI Losses Gross	71	98	1,163	98
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	(6)	10	(6)	10
OTTI Losses Recognized in Earnings	77	88	1,169	88
Total AFS Securities [Member] | Equity Securities [Member]
OTTI Losses Gross	46	357	1,360	2,977
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0	0	0	0
OTTI Losses Recognized in Earnings	46	357	1,360	2,977
Common Stock [Member] | Total AFS Securities [Member] | Equity Securities [Member]
OTTI Losses Gross	46	357	1,360	2,974
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0	0	0	0
OTTI Losses Recognized in Earnings	$ 46	$ 357	$ 1,360	2,974
Preferred Stock [Member] | Total AFS Securities [Member] | Equity Securities [Member]
OTTI Losses Gross				3
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income				0
OTTI Losses Recognized in Earnings				$ 3

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Investments (Components Of Net Realized Gains, Excluding OTTI Charges) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Available-for-sale and held-to-maturity Securities [Line Items]
HTM securities realized gain	$ 44	$ 3	$ 44	$ 3
HTM fixed income securities losses	0	0	(1)	(1)
Other investments gains	0	0	480	0
Other investments losses	(5)	0	(19)	(4)
Total net realized gains (excluding OTTI charges)	2,951	2,314	5,381	3,203
Proceeds from sale of available for sale securities	123,100	88,700	723,400	105,900
Fixed Income Securities [Member]
Schedule of Available-for-sale and held-to-maturity Securities [Line Items]
AFS securities gains	2,715	365	6,267	985
AFS securities losses	(153)	(5)	(1,740)	(41)
Equity Securities [Member]
Schedule of Available-for-sale and held-to-maturity Securities [Line Items]
AFS securities gains	350	2,171	350	2,501
AFS securities losses	$ 0	$ (220)	$ 0	$ (240)

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Indebtedness Indebtedness (Details) - Zero Point Seventy Five Percent Borrowing From Federal Home Loan Bank Due March 21, 2017 [Member] $ in Millions	Jun. 30, 2017 USD ($)
Short-term Debt [Line Items]
Federal Home Loan Bank Advances	$ 64
Federal Home Loan Bank, Advances, Interest Rate	0.75%

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Fair Value Measurements (Quantitative Disclosures of Fair Value Assets) (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Available-for-sale Securities, Debt Securities		$ 5,018,722	$ 4,792,540
Equity securities, AFS		161,694	146,753
Total AFS securities		5,180,416	4,939,293
Short-term investments		133,706	221,701
Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		5,018,722	4,792,540
Equity securities, AFS		161,694	146,753
Total AFS securities		5,180,416	4,939,293
Short-term investments		133,706	221,701
Total assets measured at fair value		5,314,122	5,160,994
U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		68,003	77,333
Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		18,714	26,865
Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		1,404,766	1,379,593
Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		1,821,510	1,997,753
Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		702,524	528,960
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		279,205	256,842
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		724,000	525,194
Common Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS		144,436	130,608
Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS		17,258	16,145
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	24,828	27,520
Equity securities, AFS	[1]	153,224	139,077
Total AFS securities	[1]	178,052	166,597
Short-term investments	[1]	133,706	221,701
Total assets measured at fair value	[1]	311,758	388,298
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	24,828	27,520
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	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]
Available-for-sale Securities, Debt Securities	[1]	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	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]
Available-for-sale Securities, Debt Securities	[1]	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS	[1]	135,966	122,932
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS	[1]	17,258	16,145
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	4,993,894	4,765,020
Equity securities, AFS	[1]	0	0
Total AFS securities	[1]	4,993,894	4,765,020
Short-term investments	[1]	0	0
Total assets measured at fair value	[1]	4,993,894	4,765,020
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	43,175	49,813
Significant Other Observable Inputs (Level 2) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	18,714	26,865
Significant Other Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	1,404,766	1,379,593
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	1,821,510	1,997,753
Significant Other Observable Inputs (Level 2) [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	702,524	528,960
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	279,205	256,842
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	724,000	525,194
Significant Other Observable Inputs (Level 2) [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS	[1]	0	0
Significant Other Observable Inputs (Level 2) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS	[1]	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		0	0
Equity securities, AFS		8,470	7,676
Total AFS securities		8,470	7,676
Short-term investments		0	0
Total assets measured at fair value		8,470	7,676
Significant Unobservable Inputs (Level 3) [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS		8,470	7,676
Significant Unobservable Inputs (Level 3) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS		$ 0	$ 0

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

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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	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	$ 75,540	$ 105,211
Long-term debt	438,894	438,667
Seven Point Twenty Five Percent Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	58,690	56,148
Six Point Seventy Percent Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	112,573	108,333
Five Point Eight Hundred Seventy Five Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	188,767	176,860
One Point Sixty One Percent Borrowing From Federal Home Loan Bank Due July 21, 2021 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	24,521	24,286
One Point Fifty Six Percent Borrowing From Federal Home Loan Bank Due August 16, 2021 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	24,462	24,219
Three Point Zero Three Percent Borrowing From Federal Home Loan Bank Due December 16, 2026 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	60,837	59,313
Long-term Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	469,850	449,159
Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	55,622	79,916
Corporate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	19,918	24,075
Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value		1,220
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Long-term debt	188,767	176,860
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Six Point Seventy Percent Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Five Point Eight Hundred Seventy Five Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	188,767	176,860
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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value		0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	69,582	97,701
Long-term debt	281,083	272,299
Significant Other Observable Inputs (Level 2) [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	58,690	56,148
Significant Other Observable Inputs (Level 2) [Member] | Six Point Seventy Percent Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	112,573	108,333
Significant Other Observable Inputs (Level 2) [Member] | Five Point Eight Hundred Seventy Five Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0	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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	24,521	24,286
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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	24,462	24,219
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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	60,837	59,313
Significant Other Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	55,622	79,916
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	13,960	16,565
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value		1,220
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	5,958	7,510
Long-term debt	0	0
Significant Unobservable Inputs (Level 3) [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0	0
Significant Unobservable Inputs (Level 3) [Member] | Six Point Seventy Percent Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0	0
Significant Unobservable Inputs (Level 3) [Member] | Five Point Eight Hundred Seventy Five Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	$ 5,958	7,510
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value		$ 0

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Reinsurance (List of Direct, Assumed, and Ceded Reinsurance Amounts) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Premiums written:
Direct	$ 706,408	$ 665,862	$ 1,390,228	$ 1,312,140
Assumed	6,488	7,788	12,179	14,108
Ceded	(99,082)	(95,510)	(189,889)	(182,749)
Net	613,814	578,140	1,212,518	1,143,499
Premiums earned:
Direct	654,588	612,406	1,301,316	1,219,067
Assumed	6,063	7,171	11,842	13,441
Ceded	(92,621)	(87,645)	(184,274)	(178,118)
Net	568,030	531,932	1,128,884	1,054,390
Loss and loss expense incurred:
Direct	389,550	362,064	731,672	723,703
Assumed	7,766	6,140	12,203	12,495
Ceded	(55,757)	(69,725)	(84,844)	(140,575)
Net	341,559	298,479	659,031	595,623
National Flood Insurance Program [Member]
Premiums written:
Ceded	(63,808)	(63,906)	(120,142)	(117,154)
Premiums earned:
Ceded	(57,655)	(56,667)	(114,932)	(113,481)
Loss and loss expense incurred:
Ceded	$ (15,140)	$ (24,261)	$ (21,681)	$ (64,979)

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Reinsurance (Ceded Premiums and Losses Related to Flood Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Ceded premiums written	$ (99,082)	$ (95,510)	$ (189,889)	$ (182,749)
Ceded premiums earned	(92,621)	(87,645)	(184,274)	(178,118)
Ceded loss and loss expense incurred	(55,757)	(69,725)	(84,844)	(140,575)
National Flood Insurance Program [Member]
Ceded premiums written	(63,808)	(63,906)	(120,142)	(117,154)
Ceded premiums earned	(57,655)	(56,667)	(114,932)	(113,481)
Ceded loss and loss expense incurred	$ (15,140)	$ (24,261)	$ (21,681)	$ (64,979)
Percentage of NFIP claims ceded by federal government			100.00%

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Reserve for Losses and Loss Expenses Reserves for Losses and Loss Expenses (Rollforward of Reserves for Losses and Loss Expenses) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Liability for Catastrophe Claims [Line Items]
Gross reserves for losses and loss expenses, at beginning of year	$ 3,691,719	$ 3,517,728
Less: reinsurance recoverable on unpaid losses and loss expenses, at beginning of year	611,200	551,019
Net reserves for losses and loss expenses, at beginning of year	3,080,519	2,966,709
Incurred losses and loss expenses for claims occurring in the current year	684,877	624,159
Incurred losses and loss expenses for claims occurring in the prior year	(25,846)	(28,536)
Total incurred losses and loss expenses	659,031	595,623
Paid losses and loss expenses for claims occurring in the current year	171,724	146,849
Paid losses and loss expenses for claims occurring in the prior years	425,521	402,255
Total paid losses and loss expenses	597,245	549,104
Net reserves for losses and loss expenses, at end of period	3,142,305	3,013,228
Add: reinsurance recoverable on unpaid losses and loss expenses, at end of period	588,916	576,941
Gross reserves for losses and loss expenses, at end of period	3,731,221	3,590,169
Change in Historical Claim Rate Experience [Member]
Liability for Catastrophe Claims [Line Items]
Incurred losses and loss expenses for claims occurring in the prior year	25,800	28,500
Change in Historical Claim Rate Experience [Member] | General Liability [Member]
Liability for Catastrophe Claims [Line Items]
Incurred losses and loss expenses for claims occurring in the prior year	37,400	22,000
Change in Historical Claim Rate Experience [Member] | Workers Compensation [Member]
Liability for Catastrophe Claims [Line Items]
Incurred losses and loss expenses for claims occurring in the prior year	15,300	21,000
Change in Historical Claim Rate Experience [Member] | Commercial Automobile [Member]
Liability for Catastrophe Claims [Line Items]
Incurred losses and loss expenses for claims occurring in the prior year	21,000	13,000
Change in Historical Claim Rate Experience [Member] | Personal Automobile [Member]
Liability for Catastrophe Claims [Line Items]
Incurred losses and loss expenses for claims occurring in the prior year	$ 4,000
Change in Historical Claim Rate Experience [Member] | Excess And Surplus Operations [Member]
Liability for Catastrophe Claims [Line Items]
Incurred losses and loss expenses for claims occurring in the prior year		$ 3,000

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Segment Information Narrative (Details)	6 Months Ended
	Jun. 30, 2017
Number of Operating Segments	4

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Segment Information (Revenue by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Total net premiums earned	$ 568,030	$ 531,932	$ 1,128,884	$ 1,054,390
Net investment income	41,430	31,182	78,849	61,951
Net realized investment gains (losses)	1,734	1,765	689	(939)
Total investment revenues	43,164	32,947	79,538	61,012
Other income	3,291	3,868	6,532	4,819
Total revenues	614,485	568,747	1,214,954	1,120,221
Standard Commercial Lines [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	446,610	414,844	887,884	818,423
Standard Commercial Lines [Member] | Commercial Automobile [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	108,316	98,896	215,445	194,315
Standard Commercial Lines [Member] | Workers Compensation [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	79,460	75,251	158,786	151,251
Standard Commercial Lines [Member] | General Liability [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	141,503	129,283	281,487	257,368
Standard Commercial Lines [Member] | Commercial Property [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	78,052	73,591	154,443	143,769
Standard Commercial Lines [Member] | Business Owners' Policies [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	24,989	24,651	49,834	48,555
Standard Commercial Lines [Member] | Bonds Segment [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	6,986	5,665	13,484	11,129
Standard Commercial Lines [Member] | Other Commercial [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	4,288	3,940	8,529	7,779
Standard Commercial Lines [Member] | Miscellaneous Income [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	3,016	3,567	5,876	4,257
Standard Personal Lines [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	71,947	71,125	143,529	141,590
Standard Personal Lines [Member] | Miscellaneous Income [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	275	301	656	561
Standard Personal Lines [Member] | Personal Automobile [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	37,663	35,881	74,613	71,661
Standard Personal Lines [Member] | Homeowners [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	32,467	33,411	65,167	66,311
Standard Personal Lines [Member] | Other Personal [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	1,542	1,532	3,093	3,057
Excess And Surplus Operations [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	52,764	49,831	104,003	99,196
Excess And Surplus Operations [Member] | General Liability [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	39,054	36,940	76,966	73,796
Excess And Surplus Operations [Member] | Commercial Property [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	13,710	12,891	27,037	25,399
Excess And Surplus Operations [Member] | Miscellaneous Income [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	$ 0	$ 0	$ 0	$ 1

XML

Segment Information (Income Before Federal Income Tax) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Net investment income	$ 41,430	$ 31,182	$ 78,849	$ 61,951
Net realized investment gains (losses)	1,734	1,765	689	(939)
Total investment income, before federal income tax	43,164	32,947	79,538	61,012
Tax on investment income	11,734	8,275	21,336	14,538
Total investment income, after federal income tax	31,430	24,672	58,202	46,474
Standard Commercial Lines [Member]
Segment Reporting Information [Line Items]
Underwriting gain (loss), before federal income tax	$ 34,759	$ 40,173	$ 77,305	$ 71,105
GAAP combined ratio	92.20%	90.20%	91.20%	91.30%
Statutory combined ratio	90.60%	88.60%	89.50%	89.10%
Standard Personal Lines [Member]
Segment Reporting Information [Line Items]
Underwriting gain (loss), before federal income tax	$ (5,768)	$ 6,125	$ (662)	$ 14,730
GAAP combined ratio	108.00%	91.40%	100.50%	89.60%
Statutory combined ratio	105.90%	89.90%	99.80%	90.10%
Excess And Surplus Operations [Member]
Segment Reporting Information [Line Items]
Underwriting gain (loss), before federal income tax	$ 1,319	$ (2,521)	$ 2,889	$ (1,103)
GAAP combined ratio	97.50%	105.10%	97.20%	101.10%
Statutory combined ratio	97.00%	102.70%	96.50%	100.60%

XML

Segment Information (Reconciliation of Segment Results to Income Before Federal Income Tax (Details)) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Investment income, before federal income tax	$ 43,164	$ 32,947	$ 79,538	$ 61,012
Interest expense	(6,081)	(5,620)	(12,187)	(11,226)
General corporate and other expenses	(8,464)	(8,793)	(20,380)	(20,332)
Income before federal income tax	58,929	62,311	126,503	114,186
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	34,759	40,173	77,305	71,105
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	(5,768)	6,125	(662)	14,730
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	1,319	(2,521)	2,889	(1,103)
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total all segments	$ 73,474	$ 76,724	$ 159,070	$ 145,744

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Retirement Plans (Components of Net Periodic Benefit Cost) (Details) - Pension Plan [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 1,606
Interest cost	3,110	3,101	6,221	6,203
Expected return on plan assets	(4,855)	(3,988)	(9,709)	(7,976)
Amortization of unrecognized net actuarial loss	482	1,481	963	2,961
Total net periodic cost	$ (1,263)	$ 594	$ (2,525)	$ 2,794

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Retirement Plans (Weighted-Average Expense Assumptions) (Details) - Pension Plan [Member]	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.41%	4.69%
Effective interest rate for calculation of service cost		4.52%
Effective interest rate for calculation of interest cost	3.83%	4.02%
Expected return on plan assets	6.24%	6.37%
Rate of compensation increase		4.00%

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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net income, Gross	$ 58,929	$ 62,311	$ 126,503	$ 114,186
Unrealized holding gains during the period, Gross	35,887	55,675	61,672	121,412
Non Credit Portion Of Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income Gross	6	(10)	6	(10)
Amounts reclassified into net income: HTM securities, Gross	(43)	(19)	(92)	(91)
Amounts reclassified into net income: Realized losses on AFS securities, Gross	(1,885)	(1,762)	(375)	937
Total unrealized gains on investment securities, Gross	33,965	53,884	61,211	122,248
Amount reclassified into net income: Net actuarial loss, Gross	508	1,517	1,015	3,033
Total defined pension and other post-retirement benefit plans, Gross	508	1,517	1,015	3,033
Other comprehensive income, Gross	34,473	55,401	62,226	125,281
Comprehensive income before tax	93,402	117,712	188,729	239,467
Net income, Tax	17,503	18,710	34,637	33,553
Unrealized holding gains during the period, Tax	12,561	19,487	21,585	42,495
Non-Credit Portion of Other-Than-Temporary Impairment Losses Recognized In Other Comprehensive Income, Tax	2	(4)	2	(4)
Amounts reclassified into net income: HTM securities, Tax	(15)	(7)	(32)	(32)
Amounts reclassified into net income: Realized losses on AFS securities, Tax	(660)	(617)	(131)	328
Total unrealized gains on investment securities, Tax	11,888	18,859	21,424	42,787
Amount reclassified into net income: Net actuarial loss, Tax	178	532	355	1,062
Total defined pension and other post-retirement benefit plans, Tax	178	532	355	1,062
Other comprehensive income, Tax	12,066	19,391	21,779	43,849
Comprehensive income, Tax	29,569	38,101	56,416	77,402
Net income	41,426	43,601	91,866	80,633
Unrealized holding gains arising during period	23,326	36,188	40,087	78,917
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent	4	6	4	6
Amounts reclassified into net income: HTM Securities	(28)	(12)	(60)	(59)
Amounts reclassified into net income: Realized (gains) losses on available-for-sale securities	(1,225)	(1,145)	(244)	609
Total unrealized gains on investment securities	22,077	35,025	39,787	79,461
Amount reclassified into net income: Net actuarial loss	330	985	660	1,971
Total defined benefit pension and post-retirement plans	330	985	660	1,971
Other comprehensive income	22,407	36,010	40,447	81,432
Comprehensive income	$ 63,833	$ 79,611	$ 132,313	$ 162,065

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Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2016			$ (15,950)
Amounts reclassified into net income: Non-credit OTTI			0
OCI before reclassifications, Defined Benefit Pension and Post Retirement Plans			0
Amount reclassified into net income: Net actuarial loss	$ 330	$ 985	660	$ 1,971
Amounts reclassified from AOCI, HTM related	(28)	(12)	(60)	(59)
Amounts reclassified from AOCI, All Other	(1,225)	(1,145)	(244)	609
Other comprehensive income	22,407	36,010	40,447	81,432
Other Comprehensive Income, Defined Benefit Pension and Post Retirement Plans, Adjustment, Net of Tax	330	$ 985	660	1,971
Ending Balance, June 30, 2017	24,497		24,497
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2016			42,170
OCI before reclassifications			40,087
Other comprehensive income			39,843
Ending Balance, June 30, 2017	82,013		82,013
Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2016			42,122
OCI before reclassifications			40,091
Amounts reclassified from AOCI			(304)
Other comprehensive income			39,787
Ending Balance, June 30, 2017	81,909		81,909
Accumulated Other-than-Temporary Impairment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2016			(150)
OCI before reclassifications			4
Other comprehensive income			4
Ending Balance, June 30, 2017	(146)		(146)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Held-to-maturity Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2016			102
OCI before reclassifications			0
Other comprehensive income			(60)
Ending Balance, June 30, 2017	42		42
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2016			(58,072)
Amount reclassified into net income: Net actuarial loss			660
Ending Balance, June 30, 2017	(57,412)		(57,412)
Accumulated other comprehensive income (loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2016			(15,950)
OCI before reclassifications			40,091
Amounts reclassified from AOCI			356
Other comprehensive income			40,447	$ 81,432
Ending Balance, June 30, 2017	$ 24,497		$ 24,497

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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Total net realized gains (losses)	$ 1,734	$ 1,765	$ 689	$ (939)
Net investment income	41,430	31,182	78,849	61,951
Losses and loss expenses incurred	341,559	298,479	659,031	595,623
Policy acquisition costs	196,824	190,731	393,052	373,958
Income before federal income tax	58,929	62,311	126,503	114,186
Total federal income tax expense	(17,503)	(18,710)	(34,637)	(33,553)
Net income	41,426	43,601	91,866	80,633
Reclassification out of AOCI
Net income	(923)	(172)	356	2,521
Reclassification out of AOCI | Pension Plan [Member]
Losses and loss expenses incurred	111	329	221	658
Policy acquisition costs	397	1,188	794	2,375
Income before federal income tax	508	1,517	1,015	3,033
Total federal income tax expense	(178)	(532)	(355)	(1,062)
Net income	330	985	660	1,971
Reclassification out of AOCI | Held-to-maturity Securities [Member]
Total net realized gains (losses)	17	60	30	88
Net investment income	(60)	(79)	(122)	(179)
Income before federal income tax	(43)	(19)	(92)	(91)
Total federal income tax expense	15	7	32	32
Net income	(28)	(12)	(60)	(59)
Reclassification out of AOCI | Available-for-sale Securities [Member]
Total net realized gains (losses)	(1,885)	(1,762)	(375)	937
Income before federal income tax	(1,885)	(1,762)	(375)	937
Total federal income tax expense	660	617	131	(328)
Net income	$ (1,225)	$ (1,145)	$ (244)	$ 609

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Related Party Transactions Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Percentage Common Stock Owned by Related Party					12.70%
Expenses Incurred, Related Parties	$ 0.5	$ 0.0	$ 1.0	$ 0.0
Due to Related Parties	$ 0.9		$ 0.9			$ 0.4