BankFinancial (BFIN) 10-K/A 16 Apr 24 2023 FY Annual report (amended) Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Feb. 28, 2024	Jun. 30, 2023
Document Information [Line Items]
Entity, Registrant Name	BANKFINANCIAL CORPORATION
Current Fiscal Year End Date	--12-31
Document, Fiscal Period Focus	FY
Document, Fiscal Year Focus	2023
Document, Type	10-K/A
Document, Annual Report	true
Document, Period End Date	Dec. 31, 2023
Document, Transition Report	false
Entity, File Number	0-51331
Entity, Incorporation, State or Country Code	MD
Entity, Tax Identification Number	75-3199276
Entity, Address, Address Line One	60 North Frontage Road
Entity, Address, City or Town	Burr Ridge
Entity, Address, State or Province	IL
Entity, Address, Postal Zip Code	60527
City Area Code	800
Local Phone Number	894-6900
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	BFIN
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	Non-accelerated Filer
Entity, Small Business	true
Entity, Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Document, Financial Statement Error Correction Flag	false
Entity, Shell Company	false
Entity, Public Float			$ 94.8
Entity, Common Stock Shares, Outstanding		12,460,678
Amendment Description	BankFinancial Corporation (the “Company”) is filing this Amendment No. 1 on Form 10-K/A to its Report on Form 10-K for the year ended December 31, 2023, as filed with the Securities and Exchange Commission on March 1, 2024. In accordance with General Instruction G(3), the Company is now filing this amendment to include in the Form 10-K the information required to be filed pursuant to Part III of Form 10-K.
Auditor Name	RSM US LLP
Auditor Location	Chicago, Illinois
Auditor Firm ID	49
Amendment Flag	true
Entity, Central Index Key	0001303942