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v3.23.3

Leases (Details) | Sep. 30, 2023 lease agreement | Dec. 31, 2022 agreement
--- | --- | ---
Number lease agreements qualified as short-term leases | agreement | 4 | 2
Minimum [Member] |  |
Term of contract | 1 month |
Maximum [Member] |  |
Term of contract | 13 years |
Branches And Office Space [Member] |  |
Number of leases | 31 |
Vehicles [Member] |  |
Number of leases | 9 |
Equipment [Member] |  |
Number of leases | 1 |

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- Definition Represents information pertaining to number of leases. + References No definition available. + Details
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Namespace Prefix: | ffic_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of short term lease agreements. + References No definition available. + Details
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Namespace Prefix: | ffic_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
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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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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