Loans Receivable (Impaired Loans and Related Interest Income by Loan Portfolio Class) (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Impaired Loans With Specific Allowances: Recorded Investment		$ 6,712,000
Impaired Loans With Specific Allowances: Related Allowance		1,290,000
Impaired Loans With No Specific Allowances: Recorded Investment	8,202,000	2,936,000
Impaired Financing Receivable, Recorded Investment, Total	8,202,000	9,648,000
Total Impaired Loans: Unpaid Principal Balance	8,821,000	9,648,000
Construction and land [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans With Specific Allowances: Recorded Investment		2,176,000
Impaired Loans With Specific Allowances: Related Allowance		407,000
Total Impaired Loans: Unpaid Principal Balance		2,176,000
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans With Specific Allowances: Recorded Investment		2,297,000
Impaired Loans With Specific Allowances: Related Allowance		623,000
Impaired Loans With No Specific Allowances: Recorded Investment	744,000	29,000
Impaired Financing Receivable, Recorded Investment, Total	744,000	2,325,000
Total Impaired Loans: Unpaid Principal Balance	1,013,000	2,325,000
Residential One-to-four-Family Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans With Specific Allowances: Recorded Investment		2,239,000
Impaired Loans With Specific Allowances: Related Allowance		260,000
Impaired Loans With No Specific Allowances: Recorded Investment	7,458,000	2,904,000
Impaired Financing Receivable, Recorded Investment, Total	7,458,000	5,143,000
Total Impaired Loans: Unpaid Principal Balance	7,808,000	5,143,000
Credit Card [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans With No Specific Allowances: Recorded Investment		3,000
Impaired Financing Receivable, Recorded Investment, Total		3,000
Total Impaired Loans: Unpaid Principal Balance		$ 3,000

FLATBUSH FEDERAL BANCORP INC 10-Q/A