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Junior Subordinated Debt - Summary of Terms and Recorded Balance of Subordinated Debenture (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Mar. 25, 2022
Subordinated Borrowing [Line Items]      
Recorded Book Value $ 101,099 $ 101,040  
Senior Subordinated Notes      
Subordinated Borrowing [Line Items]      
Face Value 98,889   $ 36,000
TriCo Cap Trust I      
Subordinated Borrowing [Line Items]      
Recorded Book Value 20,619 20,619  
TriCo Cap Trust I | Senior Subordinated Notes      
Subordinated Borrowing [Line Items]      
Face Value $ 20,619    
Current Coupon Rate 8.71%    
TriCo Cap Trust II      
Subordinated Borrowing [Line Items]      
Recorded Book Value $ 20,619 20,619  
TriCo Cap Trust II | Senior Subordinated Notes      
Subordinated Borrowing [Line Items]      
Face Value $ 20,619    
Current Coupon Rate 8.22%    
North Valley Trust II      
Subordinated Borrowing [Line Items]      
Recorded Book Value $ 5,602 5,503  
North Valley Trust II | Senior Subordinated Notes      
Subordinated Borrowing [Line Items]      
Face Value $ 6,186    
Current Coupon Rate 8.89%    
North Valley Trust III      
Subordinated Borrowing [Line Items]      
Recorded Book Value $ 4,472 4,383  
North Valley Trust III | Senior Subordinated Notes      
Subordinated Borrowing [Line Items]      
Face Value $ 5,155    
Current Coupon Rate 8.47%    
North Valley Trust IV      
Subordinated Borrowing [Line Items]      
Recorded Book Value $ 7,615 7,393  
North Valley Trust IV | Senior Subordinated Notes      
Subordinated Borrowing [Line Items]      
Face Value $ 10,310    
Current Coupon Rate 6.98%    
VRB Subordinated - 6%      
Subordinated Borrowing [Line Items]      
Recorded Book Value $ 17,000 17,187  
VRB Subordinated - 6% | Senior Subordinated Notes      
Subordinated Borrowing [Line Items]      
Interest rate 6.00%    
Face Value $ 16,000   16,000
Current Coupon Rate 6.00%    
VRB Subordinated - 5%      
Subordinated Borrowing [Line Items]      
Recorded Book Value $ 25,172 $ 25,336  
VRB Subordinated - 5% | Senior Subordinated Notes      
Subordinated Borrowing [Line Items]      
Interest rate 5.00%    
Face Value $ 20,000   $ 20,000
Current Coupon Rate 5.00%    
LIBOR | TriCo Cap Trust I | Senior Subordinated Notes      
Subordinated Borrowing [Line Items]      
Coupon Rate (Variable) 3 mo. SOFR + 3.05%    
LIBOR | TriCo Cap Trust II | Senior Subordinated Notes      
Subordinated Borrowing [Line Items]      
Coupon Rate (Variable) 3 mo. SOFR + 2.55%    
LIBOR | North Valley Trust II | Senior Subordinated Notes      
Subordinated Borrowing [Line Items]      
Coupon Rate (Variable) 3 mo. SOFR + 3.25%    
LIBOR | North Valley Trust III | Senior Subordinated Notes      
Subordinated Borrowing [Line Items]      
Coupon Rate (Variable) 3 mo. SOFR + 2.80%    
LIBOR | North Valley Trust IV | Senior Subordinated Notes      
Subordinated Borrowing [Line Items]      
Coupon Rate (Variable) 3 mo. SOFR + 1.33%