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Junior Subordinated Debt - Summary of Terms and Recorded Balance of Subordinated Debenture (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Subordinated Borrowing [Line Items]    
Recorded Book Value $ 101,222 $ 101,191
Subordinated debt    
Subordinated Borrowing [Line Items]    
Face Value 98,889  
Recorded Book Value 101,222 101,191
TriCo Cap Trust I | Subordinated debt    
Subordinated Borrowing [Line Items]    
Face Value $ 20,619  
Coupon Rate (Variable) 3 mo. SOFR + 3.05%  
Current Coupon Rate 7.61%  
Recorded Book Value $ 20,619 20,619
TriCo Cap Trust II | Subordinated debt    
Subordinated Borrowing [Line Items]    
Face Value $ 20,619  
Coupon Rate (Variable) 3 mo. SOFR + 2.55%  
Current Coupon Rate 7.10%  
Recorded Book Value $ 20,619 20,619
North Valley Trust II | Subordinated debt    
Subordinated Borrowing [Line Items]    
Face Value $ 6,186  
Coupon Rate (Variable) 3 mo. SOFR + 3.25%  
Current Coupon Rate 7.80%  
Recorded Book Value $ 5,743 5,713
North Valley Trust III | Subordinated debt    
Subordinated Borrowing [Line Items]    
Face Value $ 5,155  
Coupon Rate (Variable) 3 mo. SOFR + 2.80%  
Current Coupon Rate 7.35%  
Recorded Book Value $ 4,597 4,571
North Valley Trust IV | Subordinated debt    
Subordinated Borrowing [Line Items]    
Face Value $ 10,310  
Coupon Rate (Variable) 3 mo. SOFR + 1.33%  
Current Coupon Rate 5.89%  
Recorded Book Value $ 7,932 7,863
VRB Subordinated | Subordinated debt    
Subordinated Borrowing [Line Items]    
Face Value $ 16,000  
Coupon Rate (Variable) 3 mo. SOFR + 3.52%  
Current Coupon Rate 9.11%  
Recorded Book Value $ 16,747 $ 16,799
VRB Subordinated - 5% | Subordinated debt    
Subordinated Borrowing [Line Items]    
Interest rate 5.00% 5.00%
Face Value $ 20,000  
Current Coupon Rate 5.00%  
Recorded Book Value $ 24,965 $ 25,007