TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Statements of Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 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	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Net income	$ 5,236	$ 7,361	$ 6,325	$ 8,477	$ 4,722	$ 5,020	$ 5,321	$ 3,931	$ 27,399	$ 18,994	$ 18,590
Other comprehensive (loss) income, net of tax:
Unrealized holding (losses) gains on securities arising during the period									(2,452)	(1,216)	1,504
Change in minimum pension liability									1,750	(2)	1,140
Change in joint beneficiary agreement liability									400	(434)	(143)
Other comprehensive (loss) income									(302)	(1,652)	2,501
Comprehensive income									27,097	17,342	21,091
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net income									27,399	18,994	18,590
Other comprehensive (loss) income, net of tax:
Unrealized holding (losses) gains on securities arising during the period									(2,452)	(1,216)	1,504
Change in minimum pension liability									1,750	(2)	1,140
Change in joint beneficiary agreement liability									400	(434)	(143)
Other comprehensive (loss) income									(302)	(1,652)	2,501
Comprehensive income									$ 27,097	$ 17,342	$ 21,091