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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 28, 2025
Jun. 28, 2024
Cover [Abstract]      
Document Type 10-K/A    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2024    
Entity File Number 001-33013    
Entity Registrant Name Flushing Financial Corporation    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 11-3209278    
Entity Address, Address Line One 220 RXR Plaza    
Entity Address, City or Town Uniondale    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 11556    
City Area Code (718)    
Local Phone Number 961-5400    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol FFIC    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 358,910,000
Entity Common Stock, Shares Outstanding (in shares)   33,776,688  
Auditor Name BDO USA, P.C.    
Auditor Firm ID 243    
Auditor Location New York, New York    
Entity Central Index Key 0000923139    
Document Fiscal Period Focus FY    
Amendment Flag true    
Amendment Description Flushing Financial Corporation (the “Company”) is filing this Amendment No. 1 on Form 10-K/A (this “Amendment”) to amend the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024 (the “Original Filing”), which was originally filed with the U.S. Securities and Exchange Commission (the “SEC”) on March 11, 2025 (the “Original Filing Date”). The sole purpose of this Amendment is to supplement the Exhibits contained in Item 15(a)(3) of Part IV of the Original Filing to include Exhibit 19, Insider Trading Policy, under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), which was inadvertently omitted in the Original Filing.    
Documents Incorporated by Reference [Text Block] Portions of the Company’s definitive Proxy Statement for the Annual Meeting of Stockholders to be held on May 28, 2025 are incorporated herein by reference in Part III