Cover - shares	9 Months Ended
	Sep. 30, 2020	Nov. 02, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	001-38458
Entity Registrant Name	LEVEL ONE BANCORP, INC.
Entity Incorporation, State or Country Code	MI
Entity Tax Identification Number	71-1015624
Entity Address, Address Line One	32991 Hamilton Court
Entity Address, City or Town	Farmington Hills,
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48334
City Area Code	248
Local Phone Number	737-0300
Entity Information [Line Items]
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		7,734,322
Entity Central Index Key	0001412707
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false
Common Stock
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, no par value
Trading Symbol	LEVL
Security Exchange Name	NASDAQ
Depositary Shares, each representing a 1/100th interest in a share of 7.50% Non-Cumulative Perpetual Preferred Stock, Series B
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing a 1/100th interest in a share of 7.50% Non-Cumulative Perpetual Preferred Stock, Series B
Trading Symbol	LEVLP
Security Exchange Name	NASDAQ