TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Statements of Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								9 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed Financial Statements, Captions [Line Items]
Net income		$ 7,361	$ 6,325	$ 8,477	$ 4,722	$ 5,020	$ 5,321	$ 3,931	$ 22,163	$ 14,272
Other comprehensive income, net of tax:
Unrealized holding gains (losses) on securities arising during the period		83				98			(2,027)	(176)
Other comprehensive loss		83				98			(2,027)	(176)
Comprehensive income		7,444				5,118			20,136	14,096
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net income		7,361				5,020			22,163	14,272
Other comprehensive income, net of tax:
Unrealized holding gains (losses) on securities arising during the period		83				98			(2,027)	(176)
Other comprehensive loss		83				98			(2,027)	(176)
Comprehensive income		$ 7,444				$ 5,118			$ 20,136	$ 14,096