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TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Statements of Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]
Net income	$ 114,868	$ 117,390	$ 125,419
Other comprehensive income (loss), net of tax:
Increase (decrease) in unrealized gains on available for sale securities arising during the period	(1,286)	41,365	(204,376)
Change in minimum pension liability	1,801	(263)	8,101
Change in joint beneficiary agreement liability	192	(366)	1,389
Other comprehensive income (loss)	707	40,736	(194,886)
Comprehensive income (loss)	115,575	158,126	(69,467)
Parent
Condensed Financial Statements, Captions [Line Items]
Net income	114,868	117,390	125,419
Other comprehensive income (loss), net of tax:
Increase (decrease) in unrealized gains on available for sale securities arising during the period	(1,286)	41,365	(204,376)
Change in minimum pension liability	1,801	(263)	8,101
Change in joint beneficiary agreement liability	192	(366)	1,389
Other comprehensive income (loss)	707	40,736	(194,886)
Comprehensive income (loss)	$ 115,575	$ 158,126	$ (69,467)

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