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Note 18 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Carried at Fair Value on a Recurring Basis, and the Method Used to Determine Their Fair Value - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Securities available for sale |  |
Assets | $ 993,445 | $ 973,394
Liabilities: |  |
Liabilities | 33,332 | 31,420
Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale |  |
Assets | 668,740 | 704,933
Other Securities [Member] |  |
Securities available for sale |  |
Assets | 324,657 | 268,377
Interest Rate Swaps [Member] |  |
Securities available for sale |  |
Assets | 48 | 84
Liabilities: |  |
Liabilities | 4,314 | 2,649
Borrowings [Member] |  |
Liabilities: |  |
Liabilities | 29,018 | 28,771
Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale |  |
Assets | 0 | 0
Liabilities: |  |
Liabilities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale |  |
Assets | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Other Securities [Member] |  |
Securities available for sale |  |
Assets | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swaps [Member] |  |
Securities available for sale |  |
Assets | 0 | 0
Liabilities: |  |
Liabilities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Borrowings [Member] |  |
Liabilities: |  |
Liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale |  |
Assets | 986,233 | 950,785
Liabilities: |  |
Liabilities | 4,314 | 2,649
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale |  |
Assets | 668,740 | 704,933
Fair Value, Inputs, Level 2 [Member] | Other Securities [Member] |  |
Securities available for sale |  |
Assets | 317,445 | 245,768
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps [Member] |  |
Securities available for sale |  |
Assets | 48 | 84
Liabilities: |  |
Liabilities | 4,314 | 2,649
Fair Value, Inputs, Level 2 [Member] | Borrowings [Member] |  |
Liabilities: |  |
Liabilities | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale |  |
Assets | 7,212 | 22,609
Liabilities: |  |
Liabilities | 29,018 | 28,771
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale |  |
Assets | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Other Securities [Member] |  |
Securities available for sale |  |
Assets | 7,212 | 22,609
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swaps [Member] |  |
Securities available for sale |  |
Assets | 0 | 0
Liabilities: |  |
Liabilities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Borrowings [Member] |  |
Liabilities: |  |
Liabilities | $ 29,018 | $ 28,771

X
- References No definition available. + Details
Name: | ffic_LiabilitiesAbstract0
Namespace Prefix: | ffic_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | ffic_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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- Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |