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TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Balance Sheets (Parenthetical) (Detail) - $ / shares
Sep. 30, 2015
Dec. 31, 2014
Aug. 21, 2007
Condensed Financial Statements, Captions [Line Items]      
Common stock, par value  
Common stock, shares authorized 50,000,000 50,000,000  
Common stock, shares issued 22,764,295 22,714,964  
Common stock, shares outstanding 22,764,295 22,714,964 15,814,662
Parent [Member]      
Condensed Financial Statements, Captions [Line Items]      
Common stock, par value  
Common stock, shares authorized 50,000,000 50,000,000  
Common stock, shares issued 22,764,295 22,714,964  
Common stock, shares outstanding 22,764,295 22,714,964