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Use of Estimates (Details) $ in Thousands	Sep. 30, 2020 USD ($) loan	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Goodwill	$ 16,127		$ 16,127
Loans Receivable [Member]
Number of active forbearances | loan	509
Outstanding balance in active forbearance	$ 846,200	$ 1,300,000
Financing Receivable	$ 28,400

X

- Definition

The outstanding balance of financing receivable that are in active forbearance.

+ References

No definition available.

+ Details

Name:	ffic_FinancingReceivableActiveForbearance
Namespace Prefix:	ffic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of financing receivable in principal, interest and escrow deferred as a result of unusual or infrequent event.

+ References

No definition available.

+ Details

Name:	ffic_FinancingReceivableDefermentPrincipalInterestAndEscrow
Namespace Prefix:	ffic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The number of financing receivables in active forbearances.

+ References

No definition available.

+ Details

Name:	ffic_FinancingReceivableNumberOfActiveForbearances
Namespace Prefix:	ffic_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_LoansReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: