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FAIR VALUES OF FINANCIAL INSTRUMENTS: (Details Textual) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Valuation allowance for impaired loans | $ 7,609,000 | $ 4,273,000
Provision for impaired loan losses | 4,200,000 | 3,300,000
Other Real Estate Commercial loan | Level 3 |  |
Fair Value | 5,700,000 | 2,800,000
Other Real Estate Residential Loan | Level 3 |  |
Fair Value | 2,000,000 | 2,200,000
Municipal Securities | Level 3 |  |
Fair Value | 1,200,000 | 9,700,000
Other Real Estate | Level 3 |  |
Fair Value | 7,722,000 | 5,000,000
Assets fair value adjustment | 234,000 | 892,000
Impaired Loans | Level 3 |  |
Fair Value | 25,948,000 | 28,400,000
Valuation allowance for impaired loans | $ 7,600,000 | $ 4,300,000

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- Definition Represents the provision for impaired loan losses. + References No definition available. + Details
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Namespace Prefix: | fsfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Adjustment to the amount at which an asset could be bought or sold in a current transaction between willing parties, that is, other than in a forced or liquidation sale. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueAdjustment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant