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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, 2024
Dec. 31, 2023
Subordinated Borrowing [Line Items]    
Recorded Book Value $ 101,191 $ 101,099
Senior Subordinated Notes    
Subordinated Borrowing [Line Items]    
Face Value 98,889  
Recorded Book Value 101,191 101,099
TriCo Cap Trust I | Senior Subordinated Notes    
Subordinated Borrowing [Line Items]    
Face Value $ 20,619  
Coupon Rate (Variable) 3 mo. SOFR + 3.05%  
Current Coupon Rate 7.97%  
Recorded Book Value $ 20,619 20,619
TriCo Cap Trust II | Senior Subordinated Notes    
Subordinated Borrowing [Line Items]    
Face Value $ 20,619  
Coupon Rate (Variable) 3 mo. SOFR + 2.55%  
Current Coupon Rate 7.44%  
Recorded Book Value $ 20,619 20,619
North Valley Trust II | Senior Subordinated Notes    
Subordinated Borrowing [Line Items]    
Face Value $ 6,186  
Coupon Rate (Variable) 3 mo. SOFR + 3.25%  
Current Coupon Rate 8.08%  
Recorded Book Value $ 5,713 5,602
North Valley Trust III | Senior Subordinated Notes    
Subordinated Borrowing [Line Items]    
Face Value $ 5,155  
Coupon Rate (Variable) 3 mo. SOFR + 2.80%  
Current Coupon Rate 7.69%  
Recorded Book Value $ 4,571 4,472
North Valley Trust IV | Senior Subordinated Notes    
Subordinated Borrowing [Line Items]    
Face Value $ 10,310  
Coupon Rate (Variable) 3 mo. SOFR + 1.33%  
Current Coupon Rate 5.95%  
Recorded Book Value $ 7,863 7,615
VRB Subordinated - 6% | Senior Subordinated Notes    
Subordinated Borrowing [Line Items]    
Interest rate 6.00%  
Face Value $ 16,000  
Coupon Rate (Variable) 3 mo. SOFR + 3.52%  
Current Coupon Rate 9.11%  
Recorded Book Value $ 16,799 17,000
VRB Subordinated - 5% | Senior Subordinated Notes    
Subordinated Borrowing [Line Items]    
Interest rate 5.00%  
Face Value $ 20,000  
Current Coupon Rate 5.00%  
Recorded Book Value $ 25,007 $ 25,172