XML 67 R52.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Nature of Operations (Details) | 12 Months Ended
--- | ---
Dec. 31, 2023 Office
Nature of Operations |
Number of full service banking offices | 27
Queens County |
Nature of Operations |
Number of full service banking offices | 10
Nassau County |
Nature of Operations |
Number of full service banking offices | 4
Suffolk County |
Nature of Operations |
Number of full service banking offices | 4
Kings County |
Nature of Operations |
Number of full service banking offices | 6
New York County |
Nature of Operations |
Number of full service banking offices | 3

X
- Definition Line items represent nature of operations. + References No definition available. + Details
Name: | ffic_NatureOfOperationsLineItems
Namespace Prefix: | ffic_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of full service banking offices. + References No definition available. + Details
Name: | ffic_NumberOfFullServiceBankingOffices
Namespace Prefix: | ffic_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=ffic_QueensCountyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=ffic_NassauCountyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=ffic_SuffolkCountyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=ffic_KingsCountyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=ffic_NewYorkCountyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |