$SIGI
SELECTIVE INSURANCE GROUP INC Stock $sigi

$sigi Overview Financials Valuation SEC Filings Company Website

2023 Q2 Form 10-Q Financial Statement

#000023055723000012 Filed on May 04, 2023

Income Statement

Concept	2023 Q2	2023 Q1	2022 Q1
Revenue	$1.041B	$999.8M	$846.1M
YoY Change	20.33%	18.17%	5.24%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin	$9.300M	$12.10M	$11.02M
YoY Change	17.74%	9.79%	14.8%
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$194.8M	$189.8M	$169.8M
YoY Change	12.35%	11.78%	13.89%
% of Gross Profit
Operating Expenses	$959.2M	$877.8M	$769.0M
YoY Change	18.76%	14.15%	16.36%
Operating Profit
YoY Change
Interest Expense	-$7.300M	-$7.200M	-$9.322M
YoY Change	-74.92%	-22.76%	25.97%
% of Operating Profit
Other Income/Expense, Net	$100.0K	$100.0K
YoY Change
Pretax Income	$74.20M	$114.8M	$69.89M
YoY Change	48.69%	64.2%	-48.47%
Income Tax	$15.50M	$22.19M	$13.56M
% Of Pretax Income	20.89%	19.33%	19.4%
Net Earnings	$56.30M	$92.57M	$56.33M
YoY Change	42.46%	64.34%	-48.45%
Net Earnings / Revenue	5.41%	9.26%	6.66%
Basic Earnings Per Share	$0.93	$1.49	$0.89
Diluted Earnings Per Share	$0.92	$1.48	$0.89
COMMON SHARES
Basic Shares Outstanding	60.49M shares	60.34M shares	60.19M shares
Diluted Shares Outstanding	60.94M shares	60.91M shares	60.82M shares

Balance Sheet

Concept	2023 Q2	2023 Q1	2022 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$21.26M	$35.67M	$17.88M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$81.30M	$83.37M	$83.18M
YoY Change	-2.48%	0.22%	9.31%
Goodwill	$7.849M	$7.849M	$7.849M
YoY Change	0.0%	0.0%	0.0%
Intangibles
YoY Change
Long-Term Investments	$8.133B	$8.029B	$7.775B
YoY Change	7.22%	3.28%	2.85%
Other Assets	$192.8M	$193.6M	$72.75M
YoY Change	65.31%	166.12%	766.05%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$11.22B	$11.02B	$10.31B
YoY Change	8.72%	6.83%	4.69%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$92.00M	$88.80M	$90.58M
YoY Change	-10.27%	-1.97%	8.22%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$94.60M	$109.1M	$107.1M
YoY Change	-7.73%	1.91%	-14.83%
LONG-TERM LIABILITIES
Long-Term Debt	$503.6M	$504.2M	$505.6M
YoY Change	-0.29%	-0.27%	-8.23%
Other Long-Term Liabilities	$519.6M	$540.4M	$402.6M
YoY Change	22.2%	34.22%	7.08%
Total Long-Term Liabilities	$1.023B	$1.045B	$908.2M
YoY Change	9.99%	15.02%	-2.02%
TOTAL LIABILITIES
Total Short-Term Liabilities	$94.60M	$109.1M	$107.1M
Total Long-Term Liabilities	$1.023B	$1.045B	$908.2M
Total Liabilities	$8.546B	$8.346B	$7.532B
YoY Change	10.65%	10.8%	6.02%
SHAREHOLDERS EQUITY
Retained Earnings	$2.860B	$2.822B	$2.640B
YoY Change	7.48%	6.86%	11.73%
Common Stock	$722.3M	$712.9M	$682.1M
YoY Change	4.55%	4.51%	4.14%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$634.8M	$634.7M	$614.5M
YoY Change	2.22%	3.29%	0.95%
Treasury Stock Shares			44.34M shares
Shareholders Equity	$2.671B	$2.669B	$2.778B
YoY Change
Total Liabilities & Shareholders Equity	$11.22B	$11.02B	$10.31B
YoY Change	8.72%	6.83%	4.69%

Cashflow Statement

Concept	2023 Q2	2023 Q1	2022 Q1
OPERATING ACTIVITIES
Net Income	$56.30M	$92.57M	$56.33M
YoY Change	42.46%	64.34%	-48.45%
Depreciation, Depletion And Amortization	$194.8M	$189.8M	$169.8M
YoY Change	12.35%	11.78%	13.89%
Cash From Operating Activities	$157.9M	$135.8M	$92.68M
YoY Change	4.69%	46.49%	-28.85%
INVESTING ACTIVITIES
Capital Expenditures	$4.039M	$5.510M	$7.677M
YoY Change	-162.87%	-28.23%	68.32%
Acquisitions
YoY Change
Other Investing Activities	-$151.3M	-$92.73M	-$88.23M
YoY Change	14.47%	5.1%	-17.08%
Cash From Investing Activities	-$155.3M	-$98.24M	-$95.91M
YoY Change	12.08%	2.43%	-13.55%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$5.592M
YoY Change			-36.78%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-16.96M	-$27.08M	-$23.95M
YoY Change	-24.73%	13.04%	-6.57%
NET CHANGE
Cash From Operating Activities	157.9M	$135.8M	$92.68M
Cash From Investing Activities	-155.3M	-$98.24M	-$95.91M
Cash From Financing Activities	-16.96M	-$27.08M	-$23.95M
Net Change In Cash	-14.41M	$10.46M	-$27.18M
YoY Change	39.63%	-138.47%	330.39%
FREE CASH FLOW
Cash From Operating Activities	$157.9M	$135.8M	$92.68M
Capital Expenditures	$4.039M	$5.510M	$7.677M
Free Cash Flow	$153.8M	$130.3M	$85.00M
YoY Change	-2.16%	53.24%	-32.37%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2023Q1	dei	Amendment Flag AmendmentFlag	false
CY2023Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2023Q1	dei	Entity Central Index Key EntityCentralIndexKey	0000230557
CY2023Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023Q1	dei	Document Type DocumentType	10-Q
CY2023Q1	dei	Document Quarterly Report DocumentQuarterlyReport	true
CY2023Q1	dei	Document Period End Date DocumentPeriodEndDate	2023-03-31
CY2023Q1	dei	Document Transition Report DocumentTransitionReport	false
CY2023Q1	dei	Entity File Number EntityFileNumber	001-33067
CY2023Q1	dei	Entity Registrant Name EntityRegistrantName	SELECTIVE INSURANCE GROUP, INC
CY2023Q1	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	NJ
CY2023Q1	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	22-2168890
CY2023Q1	dei	Entity Address Address Line1 EntityAddressAddressLine1	40 Wantage Avenue
CY2023Q1	dei	Entity Address City Or Town EntityAddressCityOrTown	Branchville
CY2023Q1	dei	Entity Address State Or Province EntityAddressStateOrProvince	NJ
CY2023Q1	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	07890
CY2023Q1	dei	City Area Code CityAreaCode	(973)
CY2023Q1	dei	Local Phone Number LocalPhoneNumber	948-3000
CY2023Q1	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023Q1	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023Q1	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023Q1	dei	Entity Small Business EntitySmallBusiness	false
CY2023Q1	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	60492814	shares
CY2023Q1	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	23522000	usd
CY2022Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	29837000	usd
CY2023Q1	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	24650000	usd
CY2022Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	31157000	usd
CY2023Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	0	usd
CY2022Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	0	usd
CY2023Q1	us-gaap	Debt Securities Held To Maturity Amortized Cost After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss	24650000	usd
CY2022Q4	us-gaap	Debt Securities Held To Maturity Amortized Cost After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss	31157000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	33554000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	45721000	usd
CY2023Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	7441048000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	7185754000	usd
CY2023Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	6964516000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	6612107000	usd
CY2023Q1	sigi	Commercialmortgageloanfairvalue Commercialmortgageloanfairvalue	147540000	usd
CY2022Q4	sigi	Commercialmortgageloanfairvalue Commercialmortgageloanfairvalue	139243000	usd
CY2023Q1	sigi	Commercialmortgageloans Gross CommercialmortgageloansGross	157283000	usd
CY2022Q4	sigi	Commercialmortgageloans Gross CommercialmortgageloansGross	149305000	usd
CY2023Q1	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	99000	usd
CY2022Q4	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	116000	usd
CY2023Q1	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	157184000	usd
CY2022Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	149189000	usd
CY2023Q1	us-gaap	Equity Securities Fv Ni Cost EquitySecuritiesFvNiCost	134358000	usd
CY2022Q4	us-gaap	Equity Securities Fv Ni Cost EquitySecuritiesFvNiCost	167431000	usd
CY2023Q1	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	132175000	usd
CY2022Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	162000000	usd
CY2023Q1	us-gaap	Other Short Term Investments OtherShortTermInvestments	302750000	usd
CY2022Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	440456000	usd
CY2023Q1	us-gaap	Alternative Investment AlternativeInvestment	380028000	usd
CY2022Q4	us-gaap	Alternative Investment AlternativeInvestment	371316000	usd
CY2023Q1	us-gaap	Other Investments OtherInvestments	68141000	usd
CY2022Q4	us-gaap	Other Investments OtherInvestments	71244000	usd
CY2023Q1	us-gaap	Investments Investments	8029444000	usd
CY2022Q4	us-gaap	Investments Investments	7837469000	usd
CY2023Q1	us-gaap	Cash Cash	149000	usd
CY2022Q4	us-gaap	Cash Cash	26000	usd
CY2023Q1	us-gaap	Restricted Cash RestrictedCash	35516000	usd
CY2022Q4	us-gaap	Restricted Cash RestrictedCash	25183000	usd
CY2023Q1	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	57340000	usd
CY2022Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	59167000	usd
CY2023Q1	us-gaap	Premiums Receivable Gross PremiumsReceivableGross	1171265000	usd
CY2022Q4	us-gaap	Premiums Receivable Gross PremiumsReceivableGross	1101787000	usd
CY2023Q1	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	17100000	usd
CY2022Q4	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	16100000	usd
CY2023Q1	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	1154165000	usd
CY2022Q4	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	1085687000	usd
CY2023Q1	us-gaap	Reinsurance Recoverables On Unpaid Losses Gross ReinsuranceRecoverablesOnUnpaidLossesGross	669342000	usd
CY2022Q4	us-gaap	Reinsurance Recoverables On Unpaid Losses Gross ReinsuranceRecoverablesOnUnpaidLossesGross	784410000	usd
CY2023Q1	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	2300000	usd
CY2022Q4	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	1600000	usd
CY2023Q1	us-gaap	Reinsurance Recoverables On Paid And Unpaid Losses ReinsuranceRecoverablesOnPaidAndUnpaidLosses	667042000	usd
CY2022Q4	us-gaap	Reinsurance Recoverables On Paid And Unpaid Losses ReinsuranceRecoverablesOnPaidAndUnpaidLosses	782810000	usd
CY2023Q1	us-gaap	Prepaid Reinsurance Premiums PrepaidReinsurancePremiums	174574000	usd
CY2022Q4	us-gaap	Prepaid Reinsurance Premiums PrepaidReinsurancePremiums	172371000	usd
CY2023Q1	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	0	usd
CY2022Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	3545000	usd
CY2023Q1	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	158078000	usd
CY2022Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	172733000	usd
CY2023Q1	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	257277000	usd
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	251209000	usd
CY2023Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	83367000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	84306000	usd
CY2023Q1	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	387944000	usd
CY2022Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	368624000	usd
CY2023Q1	us-gaap	Goodwill Goodwill	7849000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	7849000	usd
CY2023Q1	us-gaap	Other Assets OtherAssets	259547000	usd
CY2022Q4	us-gaap	Other Assets OtherAssets	202491000	usd
CY2023Q1	us-gaap	Assets Assets	11015015000	usd
CY2022Q4	us-gaap	Assets Assets	10802261000	usd
CY2023Q1	us-gaap	Liability For Claims And Claims Adjustment Expense Property Casualty Liability LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability	5099450000	usd
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CY2023Q1	us-gaap	Unearned Premiums UnearnedPremiums	2092416000	usd
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CY2023Q1	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	504150000	usd
CY2022Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	504676000	usd
CY2023Q1	us-gaap	Accrued Income Taxes AccruedIncomeTaxes	20295000	usd
CY2022Q4	us-gaap	Accrued Income Taxes AccruedIncomeTaxes	0	usd
CY2023Q1	us-gaap	Employee Related Liabilities Current And Noncurrent EmployeeRelatedLiabilitiesCurrentAndNoncurrent	88779000	usd
CY2022Q4	us-gaap	Employee Related Liabilities Current And Noncurrent EmployeeRelatedLiabilitiesCurrentAndNoncurrent	115185000	usd
CY2023Q1	us-gaap	Other Liabilities OtherLiabilities	540521000	usd
CY2022Q4	us-gaap	Other Liabilities OtherLiabilities	517234000	usd
CY2023Q1	us-gaap	Liabilities Liabilities	8345611000	usd
CY2022Q4	us-gaap	Liabilities Liabilities	8274697000	usd
CY2023Q1	us-gaap	Preferred Stock Value PreferredStockValue	200000000	usd
CY2022Q4	us-gaap	Preferred Stock Value PreferredStockValue	200000000	usd
CY2023Q1	us-gaap	Common Stock Value CommonStockValue	210149000	usd
CY2022Q4	us-gaap	Common Stock Value CommonStockValue	209694000	usd
CY2023Q1	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	502713000	usd
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CY2023Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2821613000	usd
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2749703000	usd
CY2023Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-430349000	usd
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CY2022Q4	us-gaap	Treasury Stock Value TreasuryStockValue	627279000	usd
CY2023Q1	us-gaap	Stockholders Equity StockholdersEquity	2669404000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	2527564000	usd
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CY2023Q1	us-gaap	Premiums Earned Net Property And Casualty PremiumsEarnedNetPropertyAndCasualty	902336000	usd
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CY2022Q1	us-gaap	Net Investment Income NetInvestmentIncome	72602000	usd
CY2023Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	3344000	usd
CY2022Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	-40352000	usd
CY2023Q1	us-gaap	Other Income OtherIncome	2634000	usd
CY2022Q1	us-gaap	Other Income OtherIncome	1529000	usd
CY2023Q1	us-gaap	Revenues Revenues	999820000	usd
CY2022Q1	us-gaap	Revenues Revenues	846062000	usd
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CY2023Q1	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	189761000	usd
CY2022Q1	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	169757000	usd
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CY2022Q1	us-gaap	Other Underwriting Expense OtherUnderwritingExpense	93990000	usd
CY2023Q1	us-gaap	Interest Expense Debt InterestExpenseDebt	7166000	usd
CY2022Q1	us-gaap	Interest Expense Debt InterestExpenseDebt	7168000	usd
CY2023Q1	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	12108000	usd
CY2022Q1	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	11021000	usd
CY2023Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	885061000	usd
CY2022Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	776172000	usd
CY2023Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	114759000	usd
CY2022Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	69890000	usd
CY2023Q1	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	25505000	usd
CY2022Q1	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	17178000	usd
CY2023Q1	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-3320000	usd
CY2022Q1	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-3618000	usd
CY2023Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22185000	usd
CY2022Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13560000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	92574000	usd
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	56330000	usd
CY2023Q1	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	2300000	usd
CY2022Q1	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	2300000	usd
CY2023Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	90274000	usd
CY2022Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	54030000	usd
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.49
CY2022Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.89
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.48
CY2022Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.89
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	92574000	usd
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	56330000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	52079000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-206848000	usd
CY2023Q1	sigi	Non Credit Portionof Other Than Temporary Impairments Recognizedin Other Comprehensive Income NonCreditPortionofOtherThanTemporaryImpairmentsRecognizedinOtherComprehensiveIncome	17721000	usd
CY2022Q1	sigi	Non Credit Portionof Other Than Temporary Impairments Recognizedin Other Comprehensive Income NonCreditPortionofOtherThanTemporaryImpairmentsRecognizedinOtherComprehensiveIncome	-68430000	usd
CY2023Q1	sigi	Amortization Of Net Unrealized Gains Losses On Held To Maturity Transferred From Available For Sale Netof Tax AmortizationOfNetUnrealizedGainsLossesOnHeldToMaturityTransferredFromAvailableForSaleNetofTax	0	usd
CY2022Q1	sigi	Amortization Of Net Unrealized Gains Losses On Held To Maturity Transferred From Available For Sale Netof Tax AmortizationOfNetUnrealizedGainsLossesOnHeldToMaturityTransferredFromAvailableForSaleNetofTax	-1000	usd
CY2023Q1	sigi	Oci Reclassification Adjustmentfrom Aoc Ifor Writedownof Securities Netof Tax OCIReclassificationAdjustmentfromAOCIforWritedownofSecuritiesNetofTax	4822000	usd
CY2022Q1	sigi	Oci Reclassification Adjustmentfrom Aoc Ifor Writedownof Securities Netof Tax OCIReclassificationAdjustmentfromAOCIforWritedownofSecuritiesNetofTax	12633000	usd
CY2023Q1	sigi	Debt Securities Availableforsale Allowancefor Credit Loss Net DebtSecuritiesAvailableforsaleAllowanceforCreditLossNet	-7527000	usd
CY2022Q1	sigi	Debt Securities Availableforsale Allowancefor Credit Loss Net DebtSecuritiesAvailableforsaleAllowanceforCreditLossNet	17421000	usd
CY2023Q1	sigi	Total Unrealized Gains Losseson Investment Securities TotalUnrealizedGainsLossesonInvestmentSecurities	-67095000	usd
CY2022Q1	sigi	Total Unrealized Gains Losseson Investment Securities TotalUnrealizedGainsLossesonInvestmentSecurities	245223000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-598000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-329000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-598000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-329000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	67693000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-244894000	usd
CY2023Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	160267000	usd
CY2022Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-188564000	usd
CY2023Q1	us-gaap	Stockholders Equity StockholdersEquity	2669404000	usd
CY2022Q1	us-gaap	Stockholders Equity StockholdersEquity	2778241000	usd
CY2023Q1	us-gaap	Preferred Stock Dividends Per Share Declared PreferredStockDividendsPerShareDeclared	287.50
CY2022Q1	us-gaap	Preferred Stock Dividends Per Share Declared PreferredStockDividendsPerShareDeclared	287.50
CY2023Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.30
CY2022Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.28
CY2022Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	8000	shares
CY2021Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	8000	shares
CY2023Q1	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	8000	shares
CY2022Q1	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	8000	shares
CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	60338900	shares
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	60184382	shares
CY2023Q1	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	4650	shares
CY2022Q1	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	5641	shares
CY2023Q1	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	222816	shares
CY2022Q1	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	218442	shares
CY2023Q1	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	0	shares
CY2022Q1	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	1000	shares
CY2023Q1	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	73780	shares
CY2022Q1	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	71993	shares
CY2023Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	60492586	shares
CY2022Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	60335472	shares
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	92574000	usd
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	56330000	usd
CY2023Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	8957000	usd
CY2022Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	12807000	usd
CY2023Q1	us-gaap	Share Based Compensation ShareBasedCompensation	7719000	usd
CY2022Q1	us-gaap	Share Based Compensation ShareBasedCompensation	7031000	usd
CY2023Q1	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	6693000	usd
CY2022Q1	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	9406000	usd
CY2023Q1	sigi	Proceedsfromequityinvestmentsinexcessofcurrentyearearnings Proceedsfromequityinvestmentsinexcessofcurrentyearearnings	1876000	usd
CY2022Q1	sigi	Proceedsfromequityinvestmentsinexcessofcurrentyearearnings Proceedsfromequityinvestmentsinexcessofcurrentyearearnings	11626000	usd
CY2023Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	3344000	usd
CY2022Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	-40352000	usd
CY2023Q1	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	0	usd
CY2022Q1	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-2000	usd
CY2023Q1	sigi	Increase Decrease In Reserves For Losses And Loss Expenses Net Of Reinsurance Recoverables IncreaseDecreaseInReservesForLossesAndLossExpensesNetOfReinsuranceRecoverables	70397000	usd
CY2022Q1	sigi	Increase Decrease In Reserves For Losses And Loss Expenses Net Of Reinsurance Recoverables IncreaseDecreaseInReservesForLossesAndLossExpensesNetOfReinsuranceRecoverables	86197000	usd
CY2023Q1	sigi	Increase Decrease In Unearned Premiums Net Of Prepaid Reinsurance IncreaseDecreaseInUnearnedPremiumsNetOfPrepaidReinsurance	97432000	usd
CY2022Q1	sigi	Increase Decrease In Unearned Premiums Net Of Prepaid Reinsurance IncreaseDecreaseInUnearnedPremiumsNetOfPrepaidReinsurance	77515000	usd
CY2023Q1	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	20522000	usd
CY2022Q1	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	13656000	usd
CY2023Q1	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	68478000	usd
CY2022Q1	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	66346000	usd
CY2023Q1	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	19320000	usd
CY2022Q1	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	14774000	usd
CY2023Q1	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	-1456000	usd
CY2022Q1	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	185000	usd
CY2023Q1	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-26406000	usd
CY2022Q1	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-30473000	usd
CY2023Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	4083000	usd
CY2022Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	10789000	usd
CY2023Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-36840000	usd
CY2022Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-80864000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	135769000	usd
CY2022Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	92679000	usd
CY2023Q1	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	0	usd
CY2022Q1	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	5000000	usd
CY2023Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1003617000	usd
CY2022Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	874665000	usd
CY2023Q1	sigi	Payments To Acquire Commercial Mortgage Loans PaymentsToAcquireCommercialMortgageLoans	-8447000	usd
CY2022Q1	sigi	Payments To Acquire Commercial Mortgage Loans PaymentsToAcquireCommercialMortgageLoans	-20399000	usd
CY2023Q1	us-gaap	Payments To Acquire Equity Securities Fv Ni PaymentsToAcquireEquitySecuritiesFvNi	3229000	usd
CY2022Q1	us-gaap	Payments To Acquire Equity Securities Fv Ni PaymentsToAcquireEquitySecuritiesFvNi	13952000	usd
CY2023Q1	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	7736000	usd
CY2022Q1	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	15555000	usd
CY2023Q1	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	1361774000	usd
CY2022Q1	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	910191000	usd
CY2023Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	639365000	usd
CY2022Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	425234000	usd
CY2023Q1	us-gaap	Proceeds From Sale And Collection Of Mortgage Notes Receivable ProceedsFromSaleAndCollectionOfMortgageNotesReceivable	469000	usd
CY2022Q1	us-gaap	Proceeds From Sale And Collection Of Mortgage Notes Receivable ProceedsFromSaleAndCollectionOfMortgageNotesReceivable	301000	usd
CY2023Q1	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	1499963000	usd
CY2022Q1	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	1101725000	usd
CY2023Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	6507000	usd
CY2022Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	756000	usd
CY2023Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	109999000	usd
CY2022Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	216024000	usd
CY2023Q1	us-gaap	Proceeds From Sale Of Equity Securities Fv Ni ProceedsFromSaleOfEquitySecuritiesFvNi	32918000	usd
CY2022Q1	us-gaap	Proceeds From Sale Of Equity Securities Fv Ni ProceedsFromSaleOfEquitySecuritiesFvNi	2626000	usd
CY2023Q1	us-gaap	Proceeds From Sale Of Other Investments ProceedsFromSaleOfOtherInvestments	0	usd
CY2022Q1	us-gaap	Proceeds From Sale Of Other Investments ProceedsFromSaleOfOtherInvestments	525000	usd
CY2023Q1	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	2854000	usd
CY2022Q1	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	4342000	usd
CY2023Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	5510000	usd
CY2022Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	7677000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-98238000	usd
CY2022Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-95906000	usd
CY2023Q1	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	2300000	usd
CY2022Q1	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	2300000	usd
CY2023Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	17690000	usd
CY2022Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	16447000	usd
CY2023Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	7443000	usd
CY2022Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	5592000	usd
CY2023Q1	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	973000	usd
CY2022Q1	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	999000	usd
CY2023Q1	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	615000	usd
CY2022Q1	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	612000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-27075000	usd
CY2022Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-23952000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	10456000	usd
CY2022Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-27179000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	25209000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	45063000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	35665000	usd
CY2022Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	17884000	usd
CY2023Q1	us-gaap	Interest Paid Net InterestPaidNet	8528000	usd
CY2022Q1	us-gaap	Interest Paid Net InterestPaidNet	8523000	usd
CY2023Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	0	usd
CY2022Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-800000	usd
CY2023Q1	us-gaap	Operating Lease Payments OperatingLeasePayments	2235000	usd
CY2022Q1	us-gaap	Operating Lease Payments OperatingLeasePayments	2058000	usd
CY2023Q1	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	11000	usd
CY2022Q1	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	11000	usd
CY2023Q1	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	615000	usd
CY2022Q1	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	612000	usd
CY2023Q1	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	0	usd
CY2022Q1	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	38000	usd
CY2023Q1	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	4237000	usd
CY2022Q1	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	5760000	usd
CY2023Q1	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	23000	usd
CY2022Q1	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	0	usd
CY2023Q1	us-gaap	Cash Cash	149000	usd
CY2022Q4	us-gaap	Cash Cash	26000	usd
CY2023Q1	us-gaap	Restricted Cash RestrictedCash	35516000	usd
CY2022Q4	us-gaap	Restricted Cash RestrictedCash	25183000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	35665000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	25209000	usd
CY2023Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	7441048000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	33554000	usd
CY2023Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	20461000	usd
CY2023Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	463439000	usd
CY2023Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	6964516000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	7185754000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	45721000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	9262000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	537188000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	6612107000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	45721000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not Previously Recorded DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded	3730000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Purchased With Credit Deterioration Increase DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease	0	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not To Sell Before Recovery Credit Loss Previously Recorded Expense Reversal DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal	-13259000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Securities Sold DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold	-2627000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Sell Before Recovery DebtSecuritiesAvailableForSaleAllowanceForCreditLossSellBeforeRecovery	-11000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	33554000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	9724000	usd
CY2022Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not Previously Recorded DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded	18588000	usd
CY2022Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Purchased With Credit Deterioration Increase DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease	8318000	usd
CY2022Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not To Sell Before Recovery Credit Loss Previously Recorded Expense Reversal DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal	3463000	usd
CY2022Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Securities Sold DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold	-1395000	usd
CY2022Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Sell Before Recovery DebtSecuritiesAvailableForSaleAllowanceForCreditLossSellBeforeRecovery	-1099000	usd
CY2022Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	37599000	usd
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	348132000	usd
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	658000	usd
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	657000	usd
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	3062605000	usd
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	14597000	usd
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	13944000	usd
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	2814604000	usd
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	9395000	usd
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	8921000	usd
CY2023Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	739175000	usd
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	0	usd
CY2023Q1	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	0	usd
CY2023Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	6964516000	usd
CY2023Q1	us-gaap	Debt Securities Held To Maturity Amortized Cost After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss	24650000	usd
CY2023Q1	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	23522000	usd
CY2023Q1	us-gaap	Assets Held By Insurance Regulators AssetsHeldByInsuranceRegulators	23400000	usd
CY2023Q1	sigi	Fair Value Of Security Owned And Pledged As Collateral FairValueOfSecurityOwnedAndPledgedAsCollateral	127100000	usd
CY2022Q4	sigi	Maximumexposuretocreditconcentrationriskofthe Companysstockholdersequityotherthancertain U.S.Governmentagencies MaximumexposuretocreditconcentrationriskoftheCompanysstockholdersequityotherthancertainU.S.governmentagencies	0.10
CY2023Q1	sigi	Maximumexposuretocreditconcentrationriskofthe Companysstockholdersequityotherthancertain U.S.Governmentagencies MaximumexposuretocreditconcentrationriskoftheCompanysstockholdersequityotherthancertainU.S.governmentagencies	0.10
CY2023Q1	us-gaap	Net Investment Income NetInvestmentIncome	91506000	usd
CY2022Q1	us-gaap	Net Investment Income NetInvestmentIncome	72602000	usd
CY2023Q1	sigi	Debt And Equity Securities Realized Gains DebtAndEquitySecuritiesRealizedGains	3784000	usd
CY2022Q1	sigi	Debt And Equity Securities Realized Gains DebtAndEquitySecuritiesRealizedGains	2197000	usd
CY2023Q1	sigi	Debt And Equity Securities Realized Losses DebtAndEquitySecuritiesRealizedLosses	12930000	usd
CY2022Q1	sigi	Debt And Equity Securities Realized Losses DebtAndEquitySecuritiesRealizedLosses	13560000	usd
CY2023Q1	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-9146000	usd
CY2022Q1	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-11363000	usd
CY2023Q1	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	3248000	usd
CY2022Q1	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-2154000	usd
CY2023Q1	sigi	Losses On Investment Securities For Which We Have The Intent To Sell LossesOnInvestmentSecuritiesForWhichWeHaveTheIntentToSell	304000	usd
CY2022Q1	sigi	Losses On Investment Securities For Which We Have The Intent To Sell LossesOnInvestmentSecuritiesForWhichWeHaveTheIntentToSell	4797000	usd
CY2023Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	3344000	usd
CY2022Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	-40352000	usd
CY2023Q1	sigi	Change In Gain Loss On Investments ChangeInGainLossOnInvestments	43700000	usd
CY2023Q1	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-142000	usd
CY2022Q1	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-2220000	usd
CY2023Q1	sigi	Unrealized Gain Losson Equity Securities Sold UnrealizedGainLossonEquitySecuritiesSold	3390000	usd
CY2022Q1	sigi	Unrealized Gain Losson Equity Securities Sold UnrealizedGainLossonEquitySecuritiesSold	66000	usd
CY2023Q1	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	3248000	usd
CY2022Q1	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-2154000	usd
CY2023Q1	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	494738000	usd
CY2022Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	466603000	usd
CY2023Q1	us-gaap	Finance Lease Liability FinanceLeaseLiability	3103000	usd
CY2022Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	3718000	usd
CY2023Q1	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	504150000	usd
CY2022Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	504676000	usd
CY2023Q1	sigi	Net Asset Value NetAssetValue	107900000	usd
CY2022Q4	sigi	Net Asset Value NetAssetValue	103600000	usd
CY2023Q1	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	23522000	usd
CY2023Q1	sigi	Commercialmortgageloanfairvalue Commercialmortgageloanfairvalue	147540000	usd
CY2022Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	29837000	usd
CY2022Q4	sigi	Commercialmortgageloanfairvalue Commercialmortgageloanfairvalue	139243000	usd
CY2022Q4	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	16100000	usd
CY2021Q4	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	13600000	usd
CY2023Q1	sigi	Change In Allowance For Credit Losses On Premiums Receivable ChangeInAllowanceForCreditLossesOnPremiumsReceivable	2200000	usd
CY2022Q1	sigi	Change In Allowance For Credit Losses On Premiums Receivable ChangeInAllowanceForCreditLossesOnPremiumsReceivable	1200000	usd
CY2023Q1	us-gaap	Reinsurance Recoverables On Unpaid Losses Gross ReinsuranceRecoverablesOnUnpaidLossesGross	669342000	usd
CY2023Q1	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	2300000	usd
CY2023Q1	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	667042000	usd
CY2022Q4	us-gaap	Reinsurance Recoverables On Unpaid Losses Gross ReinsuranceRecoverablesOnUnpaidLossesGross	784410000	usd
CY2022Q4	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	1600000	usd
CY2022Q4	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	782810000	usd
CY2022Q4	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	1600000	usd
CY2021Q4	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	1600000	usd
CY2023Q1	us-gaap	Reinsurance Recoverable Credit Loss Expense Reversal ReinsuranceRecoverableCreditLossExpenseReversal	700000	usd
CY2022Q1	us-gaap	Reinsurance Recoverable Credit Loss Expense Reversal ReinsuranceRecoverableCreditLossExpenseReversal	0	usd
CY2023Q1	us-gaap	Reinsurance Loss On Uncollectible Accounts In Period Amount ReinsuranceLossOnUncollectibleAccountsInPeriodAmount	0	usd
CY2022Q1	us-gaap	Reinsurance Loss On Uncollectible Accounts In Period Amount ReinsuranceLossOnUncollectibleAccountsInPeriodAmount	0	usd
CY2023Q1	us-gaap	Reinsurance Recoverable Allowance For Credit Loss Recovery ReinsuranceRecoverableAllowanceForCreditLossRecovery	0	usd
CY2022Q1	us-gaap	Reinsurance Recoverable Allowance For Credit Loss Recovery ReinsuranceRecoverableAllowanceForCreditLossRecovery	0	usd
CY2023Q1	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	2300000	usd
CY2022Q1	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	1600000	usd
CY2023Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	91011000	usd
CY2023Q1	us-gaap	Schedule Of Liability For Unpaid Claims And Claims Adjustment Expense ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense	<table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:70.537%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.384%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:12.496%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.384%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:12.499%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"/><td colspan="9" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">Quarter ended March 31,</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">($ in thousands)</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">2023</span></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">2022</span></td></tr><tr><td colspan="3" style="background-color:#ccffcc;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Gross reserve for loss and loss expense, at beginning of period</span></td><td colspan="3" style="background-color:#ccffcc;border-top:1pt solid #000000;padding:0 1pt"/><td style="background-color:#ccffcc;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">$</span></td><td style="background-color:#ccffcc;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">5,144,821</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#ccffcc;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ccffcc;padding:0 1pt"/><td colspan="2" style="background-color:#ccffcc;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">4,580,903 </span></td><td style="background-color:#ccffcc;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of period</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">757,513</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%"> </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">578,641 </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ccffcc;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Net reserve for loss and loss expense, at beginning of period</span></td><td colspan="3" style="background-color:#ccffcc;padding:0 1pt"/><td colspan="2" style="background-color:#ccffcc;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">4,387,308</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#ccffcc;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ccffcc;padding:0 1pt"/><td colspan="2" style="background-color:#ccffcc;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">4,002,262 </span></td><td style="background-color:#ccffcc;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Incurred loss and loss expense for claims occurring in the:</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%"> </span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%"> </span></td></tr><tr><td colspan="3" style="background-color:#ccffcc;padding:2px 1pt 2px 7.75pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Current year</span></td><td colspan="3" style="background-color:#ccffcc;padding:0 1pt"/><td colspan="2" style="background-color:#ccffcc;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">580,408</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#ccffcc;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ccffcc;padding:0 1pt"/><td colspan="2" style="background-color:#ccffcc;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">508,299 </span></td><td style="background-color:#ccffcc;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="padding:2px 1pt 2px 7.75pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Prior years</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">(12,970)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">(14,063)</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ccffcc;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Total incurred loss and loss expense</span></td><td colspan="3" style="background-color:#ccffcc;padding:0 1pt"/><td colspan="2" style="background-color:#ccffcc;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">567,438</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#ccffcc;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ccffcc;padding:0 1pt"/><td colspan="2" style="background-color:#ccffcc;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">494,236 </span></td><td style="background-color:#ccffcc;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Paid loss and loss expense for claims occurring in the:</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%"> </span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%"> </span></td></tr><tr><td colspan="3" style="background-color:#ccffcc;padding:2px 1pt 2px 7.75pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Current year</span></td><td colspan="3" style="background-color:#ccffcc;padding:0 1pt"/><td colspan="2" style="background-color:#ccffcc;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">91,011</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#ccffcc;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ccffcc;padding:0 1pt"/><td colspan="2" style="background-color:#ccffcc;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">91,292 </span></td><td style="background-color:#ccffcc;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="padding:2px 1pt 2px 7.75pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Prior years</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">418,194</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%"> </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">312,926 </span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ccffcc;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Total paid loss and loss expense</span></td><td colspan="3" style="background-color:#ccffcc;padding:0 1pt"/><td colspan="2" style="background-color:#ccffcc;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">509,205</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#ccffcc;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ccffcc;padding:0 1pt"/><td colspan="2" style="background-color:#ccffcc;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">404,218 </span></td><td style="background-color:#ccffcc;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Net reserve for loss and loss expense, at end of period</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">4,445,541</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%"> </span></td><td style="border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">4,092,280 </span></td><td style="border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#d0ffd0;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period</span></td><td colspan="3" style="background-color:#d0ffd0;padding:0 1pt"/><td colspan="2" style="background-color:#d0ffd0;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">653,909</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#d0ffd0;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#d0ffd0;padding:0 1pt"/><td colspan="2" style="background-color:#d0ffd0;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">552,111 </span></td><td style="background-color:#d0ffd0;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Gross reserve for loss and loss expense, at end of period</span></td><td colspan="3" style="padding:0 1pt"/><td style="border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">$</span></td><td style="border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">5,099,450</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%"> </span></td><td style="border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">4,644,391 </span></td><td style="border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr></table>
CY2022Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	5144821000	usd
CY2021Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	4580903000	usd
CY2022Q4	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	757513000	usd
CY2021Q4	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	578641000	usd
CY2022Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	4387308000	usd
CY2021Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	4002262000	usd
CY2023Q1	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	580408000	usd
CY2022Q1	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	508299000	usd
CY2023Q1	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-12970000	usd
CY2022Q1	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-14063000	usd
CY2023Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	567438000	usd
CY2022Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	494236000	usd
CY2022Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	91292000	usd
CY2023Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	418194000	usd
CY2022Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	312926000	usd
CY2023Q1	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	509205000	usd
CY2022Q1	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	404218000	usd
CY2023Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	4445541000	usd
CY2022Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	4092280000	usd
CY2023Q1	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	653909000	usd
CY2022Q1	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	552111000	usd
CY2023Q1	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	5099450000	usd
CY2022Q1	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	4644391000	usd
CY2023Q1	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	4
CY2023Q1	us-gaap	Net Investment Income NetInvestmentIncome	91506000	usd
CY2022Q1	us-gaap	Net Investment Income NetInvestmentIncome	72602000	usd
CY2023Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	3344000	usd
CY2022Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	-40352000	usd
CY2023Q1	sigi	Total Investmentsrevenue TotalInvestmentsrevenue	94850000	usd
CY2022Q1	sigi	Total Investmentsrevenue TotalInvestmentsrevenue	32250000	usd
CY2023Q1	us-gaap	Revenues Revenues	999820000	usd
CY2022Q1	us-gaap	Revenues Revenues	846062000	usd
CY2023Q1	us-gaap	Net Investment Income NetInvestmentIncome	91506000	usd
CY2022Q1	us-gaap	Net Investment Income NetInvestmentIncome	72602000	usd
CY2023Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	3344000	usd
CY2022Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	-40352000	usd
CY2023Q1	sigi	Total Investmentsrevenue TotalInvestmentsrevenue	94850000	usd
CY2022Q1	sigi	Total Investmentsrevenue TotalInvestmentsrevenue	32250000	usd
CY2023Q1	sigi	Taxoninvestmentincome Taxoninvestmentincome	19156000	usd
CY2022Q1	sigi	Taxoninvestmentincome Taxoninvestmentincome	5613000	usd
CY2023Q1	sigi	Totalinvestmentsegmentincomeafterfederalincometax Totalinvestmentsegmentincomeafterfederalincometax	75694000	usd
CY2022Q1	sigi	Totalinvestmentsegmentincomeafterfederalincometax Totalinvestmentsegmentincomeafterfederalincometax	26637000	usd
CY2023Q1	sigi	Total Investmentsrevenue TotalInvestmentsrevenue	94850000	usd
CY2022Q1	sigi	Total Investmentsrevenue TotalInvestmentsrevenue	32250000	usd
CY2023Q1	us-gaap	Interest Expense Debt InterestExpenseDebt	7166000	usd
CY2022Q1	us-gaap	Interest Expense Debt InterestExpenseDebt	7168000	usd
CY2023Q1	us-gaap	Other General Expense OtherGeneralExpense	12108000	usd
CY2022Q1	us-gaap	Other General Expense OtherGeneralExpense	11021000	usd
CY2023Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	114759000	usd
CY2022Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	69890000	usd
CY2023Q1	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	2300000	usd
CY2022Q1	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	2300000	usd
CY2023Q1	sigi	Income Available To Common Stockholders Before Federal Income Tax IncomeAvailableToCommonStockholdersBeforeFederalIncomeTax	112459000	usd
CY2022Q1	sigi	Income Available To Common Stockholders Before Federal Income Tax IncomeAvailableToCommonStockholdersBeforeFederalIncomeTax	67590000	usd
CY2023Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	114759000	usd
CY2023Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22185000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	92574000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	65925000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	13846000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	52079000	usd
CY2023Q1	sigi	Non Credit Portionof Other Than Temporary Impairments Recognizedin Other Comprehensive Income Gross NonCreditPortionofOtherThanTemporaryImpairmentsRecognizedinOtherComprehensiveIncomeGross	22431000	usd
CY2023Q1	sigi	Non Credit Portionof Other Than Temporary Impairments Recognizedin Other Comprehensive Income Tax NonCreditPortionofOtherThanTemporaryImpairmentsRecognizedinOtherComprehensiveIncomeTax	4710000	usd
CY2023Q1	sigi	Non Credit Portionof Other Than Temporary Impairments Recognizedin Other Comprehensive Income NonCreditPortionofOtherThanTemporaryImpairmentsRecognizedinOtherComprehensiveIncome	17721000	usd
CY2023Q1	sigi	Oci Reclassification Adjustmentfrom Aoc Ifor Writedownof Securitiesbefore Tax OCIReclassificationAdjustmentfromAOCIforWritedownofSecuritiesbeforeTax	6104000	usd
CY2023Q1	sigi	Oci Reclassification Adjustmentfrom Aoc Ifor Writedownof Securities Tax OCIReclassificationAdjustmentfromAOCIforWritedownofSecuritiesTax	1282000	usd
CY2023Q1	sigi	Oci Reclassification Adjustmentfrom Aoc Ifor Writedownof Securities Netof Tax OCIReclassificationAdjustmentfromAOCIforWritedownofSecuritiesNetofTax	4822000	usd
CY2023Q1	sigi	Debt Securities Availableforsale Allowancefor Credit Loss Gross DebtSecuritiesAvailableforsaleAllowanceforCreditLossGross	-9529000	usd
CY2023Q1	sigi	Debt Securities Availableforsale Allowancefor Credit Loss Tax DebtSecuritiesAvailableforsaleAllowanceforCreditLossTax	-2002000	usd
CY2023Q1	sigi	Debt Securities Availableforsale Allowancefor Credit Loss Net DebtSecuritiesAvailableforsaleAllowanceforCreditLossNet	-7527000	usd
CY2023Q1	sigi	Total Unrealized Gains Losses On Investment Securities Gross TotalUnrealizedGainsLossesOnInvestmentSecuritiesGross	84931000	usd
CY2023Q1	sigi	Total Unrealized Gains Losses On Investment Securities Tax TotalUnrealizedGainsLossesOnInvestmentSecuritiesTax	17836000	usd
CY2023Q1	sigi	Total Unrealized Gains Losseson Investment Securities TotalUnrealizedGainsLossesonInvestmentSecurities	-67095000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-757000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-159000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-598000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-757000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-159000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-598000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	85688000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	17995000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	67693000	usd
CY2023Q1	sigi	Comprehensive Income Loss Before Tax ComprehensiveIncomeLossBeforeTax	200447000	usd
CY2023Q1	sigi	Comprehensive Income Loss Tax ComprehensiveIncomeLossTax	40180000	usd
CY2023Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	160267000	usd
CY2022Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	69890000	usd
CY2022Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13560000	usd
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	56330000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-261832000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-54984000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-206848000	usd
CY2022Q1	sigi	Non Credit Portionof Other Than Temporary Impairments Recognizedin Other Comprehensive Income Gross NonCreditPortionofOtherThanTemporaryImpairmentsRecognizedinOtherComprehensiveIncomeGross	-86621000	usd
CY2022Q1	sigi	Non Credit Portionof Other Than Temporary Impairments Recognizedin Other Comprehensive Income Tax NonCreditPortionofOtherThanTemporaryImpairmentsRecognizedinOtherComprehensiveIncomeTax	-18191000	usd
CY2022Q1	sigi	Non Credit Portionof Other Than Temporary Impairments Recognizedin Other Comprehensive Income NonCreditPortionofOtherThanTemporaryImpairmentsRecognizedinOtherComprehensiveIncome	-68430000	usd
CY2022Q1	sigi	Amortization Of Net Unrealized Gains Losses On Held To Maturity Transferred From Available For Sale Before Tax AmortizationOfNetUnrealizedGainsLossesOnHeldToMaturityTransferredFromAvailableForSaleBeforeTax	-1000	usd
CY2022Q1	sigi	Amortization Of Net Unrealized Gains Losses On Held To Maturity Transferred From Available For Sale Tax AmortizationOfNetUnrealizedGainsLossesOnHeldToMaturityTransferredFromAvailableForSaleTax	0	usd
CY2022Q1	sigi	Amortization Of Net Unrealized Gains Losses On Held To Maturity Transferred From Available For Sale Netof Tax AmortizationOfNetUnrealizedGainsLossesOnHeldToMaturityTransferredFromAvailableForSaleNetofTax	-1000	usd
CY2022Q1	sigi	Oci Reclassification Adjustmentfrom Aoc Ifor Writedownof Securitiesbefore Tax OCIReclassificationAdjustmentfromAOCIforWritedownofSecuritiesbeforeTax	15991000	usd
CY2022Q1	sigi	Oci Reclassification Adjustmentfrom Aoc Ifor Writedownof Securities Tax OCIReclassificationAdjustmentfromAOCIforWritedownofSecuritiesTax	3358000	usd
CY2022Q1	sigi	Oci Reclassification Adjustmentfrom Aoc Ifor Writedownof Securities Netof Tax OCIReclassificationAdjustmentfromAOCIforWritedownofSecuritiesNetofTax	12633000	usd
CY2022Q1	sigi	Debt Securities Availableforsale Allowancefor Credit Loss Gross DebtSecuritiesAvailableforsaleAllowanceforCreditLossGross	22052000	usd
CY2022Q1	sigi	Debt Securities Availableforsale Allowancefor Credit Loss Tax DebtSecuritiesAvailableforsaleAllowanceforCreditLossTax	4631000	usd
CY2022Q1	sigi	Debt Securities Availableforsale Allowancefor Credit Loss Net DebtSecuritiesAvailableforsaleAllowanceforCreditLossNet	17421000	usd
CY2022Q1	sigi	Total Unrealized Gains Losses On Investment Securities Gross TotalUnrealizedGainsLossesOnInvestmentSecuritiesGross	-310409000	usd
CY2022Q1	sigi	Total Unrealized Gains Losses On Investment Securities Tax TotalUnrealizedGainsLossesOnInvestmentSecuritiesTax	-65186000	usd
CY2022Q1	sigi	Total Unrealized Gains Losseson Investment Securities TotalUnrealizedGainsLossesonInvestmentSecurities	245223000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-417000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-88000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-329000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-417000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-88000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-329000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-309992000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-65098000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-244894000	usd
CY2022Q1	sigi	Comprehensive Income Loss Before Tax ComprehensiveIncomeLossBeforeTax	-240102000	usd
CY2022Q1	sigi	Comprehensive Income Loss Tax ComprehensiveIncomeLossTax	-51538000	usd
CY2022Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-188564000	usd
CY2023Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	90274000	usd
CY2022Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	54030000	usd
CY2023Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	60536000	shares
CY2022Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	60384000	shares
CY2023Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	372000	shares
CY2022Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	440000	shares
CY2023Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	60908000	shares
CY2022Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	60824000	shares
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.49
CY2022Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.89
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.48
CY2022Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.89

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0000230557-23-000012-xbrl.zip	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
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$SIGI
SELECTIVE INSURANCE GROUP INC Stock $sigi

2023 Q2 Form 10-Q Financial Statement

#000023055723000012 Filed on May 04, 2023

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SIGI SELECTIVE INSURANCE GROUP INC Stock $sigi

2023 Q2 Form 10-Q Financial Statement

#000023055723000012 Filed on May 04, 2023

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SIGI
SELECTIVE INSURANCE GROUP INC Stock $sigi