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Note 9 - Borrowed Funds (Details Textual) - USD ($) $ in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 03, 2007 | Jun. 21, 2007 | Jun. 20, 2007 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 30, 2015
Prepayment Penalty on Advances |  |  |  |  | $ 10,400 |  |
Advances from Federal Home Loan Banks and Letters of Credit |  |  |  | $ 1,600,800 |  |  |
Secured Debt, Repurchase Agreements |  |  |  | $ 0 | $ 0 |  |
Advances Outstanding, Collateral Agreement, Collateralized Percentage |  |  |  | 110.00% |  |  |
Subordinated Borrowing, Interest Rate |  |  |  |  | 5.25% |  |
Capital Securities [Member] | Flushing Financial Capital Trust IV [Member] |  |  |  |  |  |  |
Proceeds from Issuance of Debt | $ 20,600 |  |  |  |  |  |
Capital Securities [Member] | Flushing Financial Capital Trust II [Member] |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  | $ 20,600 |  |  |  |
Capital Securities [Member] | Flushing Financial Capital Trust III [Member] |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  | $ 20,600 |  |  |  |  |
Unsecured Line of Credit [Member] |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  | $ 100,000 |  |  |
Securities Sold under Agreements to Repurchase [Member] |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  | $ 78,000 |  |
Debt, Average Cost, Percentage |  |  |  |  | 3.80% |  |
Federal Home Loan Bank of New York [Member] |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Repayment and Penalties |  |  |  |  | $ 130,000 | $ 80,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  |  |  |  | 2.82% | 3.46% | 4.41%
Extended Average Maturity Without Prepayment Penalty |  |  |  |  |  | 2 years 109 days |
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available |  |  |  | $ 2,819,500 |  |  |
Federal Home Loan Bank Advances [Member] | Federal Home Loan Bank of New York [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 1 day |  |  |
Federal Home Loan Bank Advances [Member] | Federal Home Loan Bank of New York [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 5 years |  |  |
Subordinated Debt [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 75,000 |  |

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- Definition Represents the percentage of advances outstanding which must be collateralized pursuant to the collateral agreement. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount of repayments and penalties incurred in the satisfaction or roll-over of Federal Home Loan Bank (FHLB) advance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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