Fair Value Measurements and Fair Values of Financial Instruments (Fair Value, by Balance Sheet Grouping) (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
FHLB stock	$ 472,400	$ 698,200
Accrued interest receivable	482,930	554,307
Carrying Amount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	11,554,000	8,801,000
Securities held to maturity	27,917,000	25,749,000
FHLB stock	472,000	698,000
Loans receivable	87,356,000	95,162,000
Accrued interest receivable	483,000	554,000
Deposits	117,530,000	114,923,000
Advances from FHLB	5,393,000	10,082,000
Accrued interest payable	2,000	5,000
Estimated Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	11,554,000	8,801,000
Securities held to maturity	29,658,000	27,402,000
FHLB stock	472,000	698,000
Loans receivable	90,778,000	101,557,000
Accrued interest receivable	483,000	554,000
Deposits	117,857,000	116,442,000
Advances from FHLB	5,396,000	10,113,000
Accrued interest payable	2,000	5,000
(Level 1) Quoted Prices in Active Markets for Identical Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	11,554,000
Accrued interest receivable	483,000
Deposits	39,439,000
Accrued interest payable	2,000
(Level 2) Significant Other Observable Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity	29,658,000
FHLB stock	472,000
Deposits	78,418,000
Advances from FHLB	5,396,000
(Level 3) Significant Unobservable Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable	$ 90,778,000

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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FLATBUSH FEDERAL BANCORP INC 10-Q/A