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Note 16 - Concentration of Credit Risk (Details Textual) $ in Millions	Dec. 31, 2017 USD ($)
Lending Limit to Single Borrower	$ 94.7
Largest Aggregate Amount of Loans to Single Borrower	$ 74.2

X

- Definition

Largest aggregate amount of loans to a single borrower.

+ References

No definition available.

+ Details

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

X

- Definition

Represents lending limit to a single borrower.

+ References

No definition available.

+ Details

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