First Savings Financial (FSFG) 10-K/A 29 Feb 24 2023 FY Annual report (amended) Financial data

Cover

Cover - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Dec. 04, 2023	Mar. 31, 2023
Cover [Abstract]
Document Type	10-K/A
Amendment Flag	true
Amendment Description	This Form 10-K/A is filed to amend Part IV, Item 15 (Exhibits and Financial Statement Schedules) of the Annual Report on Form 10-K for the fiscal year ended September 30, 2023, as filed on December 20, 2023 (the "Original Form 10-K"), to include as an exhibit the First Savings Financial Group, Inc. Clawback Policy.
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2023
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
Current Fiscal Year End Date	--09-30
Entity File Number	1-34155
Entity Registrant Name	FIRST SAVINGS FINANCIAL GROUP, INC.
Entity Central Index Key	0001435508
Entity Tax Identification Number	37-1567871
Entity Incorporation, State or Country Code	IN
Entity Address, Address Line One	702 North Shore Drive, Suite 300,
Entity Address, City or Town	Jeffersonville
Entity Address, State or Province	IN
Entity Address, Postal Zip Code	47130
City Area Code	812
Local Phone Number	283-0724
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	FSFG
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	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 136
Entity Common Stock, Shares Outstanding		6,917,921
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Auditor Name	FORVIS, LLP
Auditor Firm ID	686
Auditor Location	Louisville, Kentucky