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TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Statements of Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]      
Net interest expense $ (135,204) $ (81,677) $ (9,529)
Income before provision for income taxes 155,104 160,905 173,907
Equity in net income of Tri Counties Bank:      
Income tax benefit (40,236) (43,515) (48,488)
Net income 114,868 117,390 125,419
Parent      
Condensed Financial Statements, Captions [Line Items]      
Net interest expense (7,372) (6,878) (4,385)
Administration expense (1,096) (1,096) (816)
Income before provision for income taxes (8,468) (7,974) (5,201)
Equity in net income of Tri Counties Bank:      
Distributed 71,152 52,805 64,188
Undistributed 49,681 70,202 64,896
Income tax benefit 2,503 2,357 1,536
Net income $ 114,868 $ 117,390 $ 125,419