Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Aug. 05, 2019
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000356171
Current Fiscal Year End Date	--12-31
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2019
Entity Registrant Name	TRICO BANCSHARES /
Entity File Number	000-10661
Entity Tax Identification Number	94-2792841
Entity Incorporation, State or Country Code	CA
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Address, Address Line One	63 Constitution Drive
Entity Address, City or Town	Chico
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95973
City Area Code	(530)
Local Phone Number	898-0300
Trading Symbol	TCBK
Security Exchange Name	NASDAQ
Title of 12(b) Security	Common Stock
Entity Common Stock, Shares Outstanding		30,509,637