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TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Statements of Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Net income	$ 28,222	$ 27,422	$ 28,362	$ 33,649	$ 23,657	$ 17,606	$ 7,430	$ 16,121	$ 117,655	$ 64,814	$ 92,072
Other comprehensive income (loss), net of tax:
Increase (decrease) in unrealized gains on available for sale securities arising during the period									(13,788)	11,126	17,159
Change in minimum pension liability									2,602	6,972	(4,502)
Change in joint beneficiary agreement liability									(113)	(596)	0
Other comprehensive income (loss)									(11,299)	17,502	12,657
Comprehensive income									106,356	82,316	104,729
Parent
Condensed Financial Statements, Captions [Line Items]
Net income									117,655	64,814	92,072
Other comprehensive income (loss), net of tax:
Increase (decrease) in unrealized gains on available for sale securities arising during the period									(13,788)	11,126	17,159
Change in minimum pension liability									2,602	6,972	(4,502)
Change in joint beneficiary agreement liability									(113)	(596)	0
Other comprehensive income (loss)									(11,299)	17,502	12,657
Comprehensive income									$ 106,356	$ 82,316	$ 104,729

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