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Fair Value (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range of Inputs | 5.00% |
Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range of Inputs | 20.00% |
State and Municipal Obligations | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | $ 6,502 |
Valuation Technique(s) | Discounted cash flow |
Unobservable Inputs | Discount rate |
State and Municipal Obligations | Minimum [Member] | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range of Inputs | 3.05% |
State and Municipal Obligations | Maximum [Member] | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range of Inputs | 5.50% |
State And Municipal Obligations | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Unobservable Inputs | Probability of default |
Range of Inputs | 0.00% |
Other Real Estate | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | 7,752 |
Valuation Technique(s) | Sales comparison/income approach |
Unobservable Inputs | Discount rate for age of appraisal and market conditions |
Other Real Estate | Minimum [Member] | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range of Inputs | 5.00% |
Other Real Estate | Maximum [Member] | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range of Inputs | 20.00% |
Impaired Loans | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | $ 26,789 | $ 26,000
Valuation Technique(s) | Sales comparison/income approach |
Unobservable Inputs | Discount rate for age of appraisal and market conditions |
Impaired Loans | Minimum [Member] | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range of Inputs | 0.00% |
Impaired Loans | Maximum [Member] | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range of Inputs | 50.00% |

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- 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_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- 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 + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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 + Details
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