Note 16 - Concentration of Credit Risk (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Risks and Uncertainties [Abstract]
Lending Limit to Single Borrower	$ 70.8ffic_LendingLimitToSingleBorrower
Largest Aggregate Amount of Loans to Single Borrower	$ 66.7

Largest aggregate amount of loans to a single borrower.

No definition available.

Name:	ffic_LargestAggregateAmountOfLoansToSingleBorrower
Namespace Prefix:	ffic_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant