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Note 16 - Concentration of Credit Risk (Details Textual) $ in Millions | Dec. 31, 2017 USD ($)
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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