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RETIREMENT PLANS: (Details 4)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Pension Plan [Member]
Defined Benefit Plan Percentage Of Plan Assets	100.00%	100.00%
Employee Stock Ownership Plan [Member]
Defined Benefit Plan Percentage Of Plan Assets	100.00%	100.00%
Equity Securities [Member]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	88.00%
Equity Securities [Member] | Pension Plan [Member]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	61.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	63.00%
Defined Benefit Plan Percentage Of Plan Assets	55.00%	49.00%
Equity Securities [Member] | Employee Stock Ownership Plan [Member]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	99.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	100.00%
Defined Benefit Plan Percentage Of Plan Assets	98.00%	99.00%
Convertible Debt Securities [Member] | Pension Plan [Member]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	33.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	36.00%
Defined Benefit Plan Percentage Of Plan Assets	33.00%	36.00%
Convertible Debt Securities [Member] | Employee Stock Ownership Plan [Member]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	0.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	0.00%
Defined Benefit Plan Percentage Of Plan Assets	0.00%	0.00%
Other Securities [Member] | Pension Plan [Member]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	1.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	6.00%
Defined Benefit Plan Percentage Of Plan Assets	12.00%	15.00%
Other Securities [Member] | Employee Stock Ownership Plan [Member]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	0.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	1.00%
Defined Benefit Plan Percentage Of Plan Assets	2.00%	1.00%

X

- Definition

The percentage of plan assets during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsfg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(i)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(i)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration