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v3.19.3.a.u2

Other Real Estate Owned (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Other Real Estate, Roll Forward [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31,
​ |  | 2019 |  | 2018 |  | 2017
​ | ​ | (In thousands)
Balance at beginning of year | ​ | $ | — | ​ | $ | — | ​ | $ | 533
Additions | ​ |  | 239 | ​ |  | 638 | ​ |  | —
Sales | ​ |  | — | ​ |  | (638) | ​ |  | (533)
Balance at end of year | ​ | $ | 239 | ​ | $ | — | ​ | $ | —
Gross Gains, Gross (Losses) and Write-downs of OREO [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31,
​ |  | 2019 |  | 2018 |  | 2017
​ | ​ | (In thousands)
Gross gains | ​ | $ | — | ​ | $ | 27 | ​ | $ | 50
Gross losses | ​ |  | — | ​ |  | — | ​ |  | —
Write-down of carrying value | ​ |  | — | ​ |  | — | ​ |  | —
Total income | ​ | $ | — | ​ | $ | 27 | ​ | $ | 50

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- Definition Represents gross gain, gross losses and write downs of OREO. + References No definition available. + Details
Name: | ffic_GrossGainsGrossLossesAndWriteDownsOfOREOTableTextBlock
Namespace Prefix: | ffic_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of the change in other real estate on properties owned. Excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure by banks. + References No definition available. + Details
Name: | us-gaap_OtherRealEstateRollForwardTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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