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Junior Subordinated Debt - Additional Information (Detail)
9 Months Ended
Oct. 03, 2014
USD ($)
Sep. 30, 2016
USD ($)
$ / Underwriting_Fees
shares
Dec. 31, 2015
USD ($)
shares
Jun. 22, 2004
USD ($)
$ / shares
shares
Jul. 31, 2003
USD ($)
$ / shares
shares
Class of Stock [Line Items]          
Common stock shares issued | shares   22,827,277 22,775,173    
Subordinated debenture, Face Value   $ 62,889,000      
Subordinated debenture, recorded fair value   56,617,000 $ 56,470,000    
Prior to Amendment [Member]          
Class of Stock [Line Items]          
Subordinated debenture, recorded fair value   147,000      
Post Amendment [Member]          
Class of Stock [Line Items]          
Subordinated debenture, recorded fair value   $ 56,617,000      
North Valley Bancorp [Member]          
Class of Stock [Line Items]          
Acquisition, completion date   Oct. 03, 2014      
TriCo Capital Trust I [Member]          
Class of Stock [Line Items]          
Common stock shares issued | shares         619
Common stock par value | $ / shares         $ 1,000
Issuance of common stock, aggregate value         $ 619,000
Issued Junior Subordinated Debenture to the trust         $ 20,619,000
Offering of cumulative trust preferred securities | shares         20,000
Cumulative trust preferred securities for cash in an aggregate amount         $ 20,000,000
Redeem the trust preferred securities   Oct. 07, 2033      
LIBOR Rate, Description   Three-month LIBOR plus 3.05%      
Preferred securities redeemable interest rate   3.05%      
Company paid underwriting fees, per trust preferred security | $ / Underwriting_Fees   7.50      
Company paid underwriting fees aggregate   $ 150,000      
Net proceeds were used to finance the opening of new branches, services and technology   19,850,000      
Subordinated debenture, Face Value   20,619,000      
Subordinated debenture, recorded fair value   $ 20,619,000 20,619,000    
TriCo Capital Trust II [Member]          
Class of Stock [Line Items]          
Common stock shares issued | shares       619  
Common stock par value | $ / shares       $ 1,000  
Issuance of common stock, aggregate value       $ 619,000  
Issued Junior Subordinated Debenture to the trust       $ 20,619,000  
Offering of cumulative trust preferred securities | shares       20,000  
Cumulative trust preferred securities for cash in an aggregate amount       $ 20,000,000  
Redeem the trust preferred securities   Jul. 23, 2034      
LIBOR Rate, Description   Three-month LIBOR plus 2.55%      
Preferred securities redeemable interest rate   2.55%      
Company paid underwriting fees, per trust preferred security | $ / Underwriting_Fees   2.50      
Company paid underwriting fees aggregate   $ 50,000      
Net proceeds were used to finance the opening of new branches, services and technology   19,950,000      
Subordinated debenture, Face Value   20,619,000      
Subordinated debenture, recorded fair value   20,619,000 20,619,000    
North Valley Trust II [Member]          
Class of Stock [Line Items]          
Subordinated debenture, Face Value $ 6,186,000 6,186,000      
Acquisition of common stock interests 186,000        
Subordinated debenture, recorded fair value 5,006,000 5,085,000 5,055,000    
North Valley Trust III [Member]          
Class of Stock [Line Items]          
Subordinated debenture, Face Value 5,155,000 5,155,000      
Acquisition of common stock interests 155,000        
Subordinated debenture, recorded fair value 3,918,000 3,995,000 3,966,000    
North Valley Trust IV [Member]          
Class of Stock [Line Items]          
Subordinated debenture, Face Value 10,310,000 10,310,000      
Acquisition of common stock interests 310,000        
Subordinated debenture, recorded fair value $ 6,063,000 $ 6,299,000 $ 6,211,000