Cover Page - shares	6 Months Ended
	Jun. 30, 2020	Jul. 31, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	001-38317
Entity Incorporation, State or Country Code	CA
Entity Tax Identification Number	68-0270948
Entity Address, Address Line One	520 Third St, Fourth Floor
Entity Address, City or Town	Santa Rosa
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95401
City Area Code	844
Local Phone Number	446-8201
Title of 12(b) Security	Common stock, no par value
Trading Symbol	LBC
Security Exchange Name	NASDAQ
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 (in shares)		52,394,127
Amendment Flag	false
Entity Registrant Name	Luther Burbank Corp.
Entity Central Index Key	0001475348
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2