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Junior Subordinated Debt - Summary of Terms and Recorded Balance of Subordinated Debenture (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Subordinated Borrowing [Line Items]
Recorded Book Value	$ 101,164	$ 101,099
Subordinated debt
Subordinated Borrowing [Line Items]
Face Value	98,889
Recorded Book Value	101,164	101,099
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	8.61%
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	8.09%
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	8.76%
Recorded Book Value	$ 5,684	5,602
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	8.34%
Recorded Book Value	$ 4,544	4,472
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	6.54%
Recorded Book Value	$ 7,797	7,615
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	$ 16,852	17,000
VRB Subordinated - 5% | Subordinated debt
Subordinated Borrowing [Line Items]
Interest rate	5.00%
Face Value	$ 20,000
Current Coupon Rate	5.00%
Recorded Book Value	$ 25,049	$ 25,172

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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