TriCo Bancshares Condensed Financial Statements (Parent Only) - Condensed Balance Sheets (Parenthetical) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	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	16,139,414	16,076,662
Common stock, shares outstanding	16,139,414	16,076,662	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	16,139,414	16,076,662
Common stock, shares outstanding	16,139,414	16,076,662