Cover - USD ($) $ in Millions	12 Months Ended
Cover - USD ($) $ in Millions	Dec. 31, 2024	Feb. 28, 2025	Jun. 30, 2024
Cover [Abstract]
Document Type	10-K/A
Amendment Flag	true
Amendment Description	This Amendment No. 1 to the annual report of Sterling Bancorp, Inc. on Form 10-K/A ("Form 10-K/A") amends the Company's annual report on Form 10-K for the year ended December 31, 2024, which was originally filed with the Securities and Exchange Commission on March 14, 2025 ("Original Form 10-K"). This Form 10-K/A is being filed for the sole purpose of providing information required by Part III of Form 10-K that was not included in the Original Form 10-K. The Part III information may be incorporated by reference from the Company's definitive proxy statement, or if such proxy statement is not filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year, such information may be included in an amendment to the Form 10-K.
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2024
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2024
Current Fiscal Year End Date	--12-31
Entity File Number	001-38290
Entity Registrant Name	Sterling Bancorp, Inc.
Entity Central Index Key	0001680379
Entity Tax Identification Number	38-3163775
Entity Incorporation, State or Country Code	MI
Entity Address, Address Line One	One Towne Square
Entity Address, Address Line Two	Suite 1900
Entity Address, City or Town	Southfield
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48076
City Area Code	248
Local Phone Number	355-2400
Title of 12(b) Security	Common Stock
Trading Symbol	SBT
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			$ 92.1
Entity Common Stock, Shares Outstanding		52,298,918
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Auditor Name	Crowe LLP
Auditor Location	Grand Rapids, Michigan
Auditor Firm ID	173

Sterling Bancorp, Inc. 10-K/A