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TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Balance Sheets, Nonprinting (Detail) - $ / shares
Dec. 31, 2021
Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]    
Preferred stock, par value (in dollars per share) $ 0 $ 0
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 50,000,000 50,000,000
Common stock, shares issued (in shares) 29,730,424 29,727,214
Common stock, shares outstanding (in shares) 29,730,424 29,727,214