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Note 18 - Fair Value of Financial Instruments (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Financial Assets at Fair Value Option | $ 13,800 | $ 14,300 |
Financial Liabilities at Fair Value Option | 41,800 | 37,000 |
Proceeds from Sale of Long-term Investments | 200 | 3,000 |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | (4,122) | (3,465) | $ (3,434)
Financial Liabilites at Fair Value Option Contractual Principal | 61,900 | 61,900 |
Financial Liabilities at Fair Value Option Accrued Interest Payable | $ 200 | 200 |
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount |  | 11,600 |
Appraised Value of Property [Member] |  |  |
Collateral Dependent Loans Measurement Input | 0.85 |  |
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 0 | 0 |
Interest Rate Swaps [Member] |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | $ 900 | $ (600) | $ 1,500

X
- Definition Represents the collateral dependent loans measurement input. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

X
- Definition The fair value option of financial assets. + References No definition available. + Details
Name: | ffic_FinancialAssetsAtFairValueOption
Namespace Prefix: | ffic_
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Balance Type: | debit
Period Type: | instant

X
- Definition The fair value of the option contractual principal. + References No definition available. + Details
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Balance Type: | credit
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X
- Definition The fair value option of financial liabilities. + References No definition available. + Details
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X
- Definition The fair value of the accrued interest payable on the option. + References No definition available. + Details
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X
- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, beyond the current operating cycle. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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