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FAIR VALUES OF FINANCIAL INSTRUMENTS: (Details 2) (Level 3, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
State and Municipal Obligations
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 9,911
Valuation Technique(s)	Discounted cash flow
Unobservable Inputs	Discount rate
State and Municipal Obligations | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of Inputs	3.05%
State and Municipal Obligations | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of Inputs	5.50%
State And Municipal Obligations
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation Technique(s)	Probability of default
Unobservable Inputs	Probability of default
Range of Inputs	0.00%
Other Real Estate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	7,722	5,000
Valuation Technique(s)	Sales comparison/income approach
Unobservable Inputs	Discount rate for age of appraisal and market conditions
Other Real Estate | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of Inputs	5.00%
Other Real Estate | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of Inputs	20.00%
Impaired Loans
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 25,948	$ 28,400
Valuation Technique(s)	Sales comparison/income approach
Unobservable Inputs	Discount rate for age of appraisal and market conditions
Impaired Loans | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of Inputs	0.00%
Impaired Loans | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of Inputs	50.00%

X

- Definition

The description of the unobservable input used to measure the fair value of assets at the end of the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsfg_
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X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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Balance Type:	debit
Period Type:	instant

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X

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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X

- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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