Junior Subordinated Debt - Summary of Terms and Recorded Balance of Subordinated Debenture (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Mar. 25, 2022	Dec. 31, 2021
Subordinated Borrowing [Line Items]
Recorded Book Value	$ 101,040		$ 58,079
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	7.13%
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	6.87%
North Valley Trust II
Subordinated Borrowing [Line Items]
Recorded Book Value	$ 5,503		5,403
North Valley Trust II | Senior Subordinated Notes
Subordinated Borrowing [Line Items]
Face Value	$ 6,186
Current Coupon Rate	7.69%
North Valley Trust III
Subordinated Borrowing [Line Items]
Recorded Book Value	$ 4,383		4,291
North Valley Trust III | Senior Subordinated Notes
Subordinated Borrowing [Line Items]
Face Value	$ 5,155
Current Coupon Rate	7.12%
North Valley Trust IV
Subordinated Borrowing [Line Items]
Recorded Book Value	$ 7,393		7,147
North Valley Trust IV | Senior Subordinated Notes
Subordinated Borrowing [Line Items]
Face Value	$ 10,310
Current Coupon Rate	6.10%
VRB Subordinated - 6%
Subordinated Borrowing [Line Items]
Recorded Book Value	$ 17,187		0
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	$ 25,336		$ 0
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 PLUS | TriCo Cap Trust I | Senior Subordinated Notes
Subordinated Borrowing [Line Items]
Coupon Rate (Variable) 3 mo. LIBOR +	3.05%
LIBOR PLUS | TriCo Cap Trust II | Senior Subordinated Notes
Subordinated Borrowing [Line Items]
Coupon Rate (Variable) 3 mo. LIBOR +	2.55%
LIBOR PLUS | North Valley Trust II | Senior Subordinated Notes
Subordinated Borrowing [Line Items]
Coupon Rate (Variable) 3 mo. LIBOR +	3.25%
LIBOR PLUS | North Valley Trust III | Senior Subordinated Notes
Subordinated Borrowing [Line Items]
Coupon Rate (Variable) 3 mo. LIBOR +	2.80%
LIBOR PLUS | North Valley Trust IV | Senior Subordinated Notes
Subordinated Borrowing [Line Items]
Coupon Rate (Variable) 3 mo. LIBOR +	1.33%