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TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Statements of Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items]      
Net interest expense $ (81,677) $ (9,529) $ (5,508)
Income before income taxes 160,905 173,907 163,703
Equity in net income of Tri Counties Bank:      
Income tax benefit (43,515) (48,488) (46,048)
Net income 117,390 125,419 117,655
Parent      
Condensed Financial Statements, Captions [Line Items]      
Net interest expense (6,878) (4,385) (2,128)
Administration expense (1,096) (816) (985)
Income before income taxes (7,974) (5,201) (3,113)
Equity in net income of Tri Counties Bank:      
Distributed 52,805 64,188 31,571
Undistributed 70,202 64,896 88,289
Income tax benefit 2,357 1,536 908
Net income $ 117,390 $ 125,419 $ 117,655