XML 78 R38.htm IDEA: XBRL DOCUMENT v2.4.0.6

Investments (HTM Fixed Maturity Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Investments [Abstract]
Due in one year or less Carrying Value	$ 81,754
Due after one year through five years Carrying Value	495,428
Due after five years through 10 years Carrying Value	83,147
Due after 10 years Carrying Value	6,863
Total HTM fixed maturity securities Carrying Value	667,192
Due in one year or less Fair Value	86,784
Due after one year through five years Fair Value	525,309
Due after five years through 10 years Fair Value	91,452
Due after 10 years Fair Value	8,186
Total HTM fixed maturity securities Fair Value	$ 711,731

X

- Definition

For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity; such investments are measured at carrying value, which represents amortized cost adjusted for net unrealized gains (losses) resulting from: (i) an other-than-temporary impairment; or (ii) a previous available-for-sale designation. The held-to-maturity category is for those securities that the Entity has the positive intent and ability to hold until maturity.

+ References

No definition available.

+ Details

Name:	sigi_HeldToMaturityAtCarryValue
Namespace Prefix:	sigi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents investments in debt securities which are categorized as held-to-maturity which are expected to mature after five years and through ten years from balance sheet date; such investments are measured at carrying value, which represents amortized cost adjusted for net unrealized gains (losses) resulting from: (i) an other-than-temporary impairment; or (ii) a previous available-for-sale designation. The held-to-maturity category is for those securities that the Entity has the positive intent and ability to hold until maturity.

+ References

No definition available.

+ Details

Name:	sigi_HeldToMaturityDebtSecuritiesMaturitiesDueAfterFiveYearsThroughTenYearsNetCarryingAmount
Namespace Prefix:	sigi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents investments in debt securities which are categorized as held-to-maturity which are expected to mature after one year and through five years from balance sheet date; such investments are measured at carrying value, which represents amortized cost adjusted for net unrealized gains (losses) resulting from: (i) an other-than-temporary impairment; or (ii) a previous available-for-sale designation. The held-to-maturity category is for those securities that the Entity has the positive intent and ability to hold until maturity.

+ References

No definition available.

+ Details

Name:	sigi_HeldToMaturityDebtSecuritiesMaturitiesDueAfterOneYearThroughFiveYearsCarryingValue
Namespace Prefix:	sigi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents investments in debt securities which are categorized as held-to-maturity which are expected to mature after ten years from balance sheet date; such investments are measured at carrying value, which represents amortized cost adjusted for net unrealized gains (losses) resulting from: (i) an other-than-temporary impairment; or (ii) a previous available-for-sale designation. The held-to-maturity category is for those securities that the Entity has the positive intent and ability to hold until maturity.

+ References

No definition available.

+ Details

Name:	sigi_HeldToMaturityDebtSecuritiesMaturitiesDueAfterTenYearsNetCarryingAmount
Namespace Prefix:	sigi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents investments in debt securities which are categorized as held-to-maturity which are expected to mature within one year from the balance sheet date; such investments are measured at carrying value, which represents amortized cost adjusted for net unrealized gains (losses) resulting from: (i) an other-than-temporary impairment; or (ii) a previous available-for-sale designation. The held-to-maturity category is for those securities that the Entity has the positive intent and ability to hold until maturity.

+ References

No definition available.

+ Details

Name:	sigi_HeldToMaturityDebtSecuritiesMaturitiesDueWithinOneYearNetCarryingAmount
Namespace Prefix:	sigi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the fair value of debt securities which are expected to mature after five years and through ten years from the balance sheet date and which are categorized as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 20

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 320

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the fair value of debt securities which are expected to mature after one year and through five years from the balance sheet date and which are categorized as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 20

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 320

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the fair value of debt securities which are expected to mature after ten years from the balance sheet date which are categorized as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 20

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 320

-Section 50

-Paragraph 3

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the total of all debt securities grouped by maturity dates, at fair value, which are categorized as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesDebtMaturitiesFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the fair value of debt securities which are expected to mature within one year of the balance sheet date and which are categorized as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 20

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 320

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_InvestmentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration