Subordinated Debentures - Summary of Terms and Recorded Balance of Subordinated Debenture (Detail) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2023	Dec. 31, 2022
Subordinated Borrowing [Line Items]
Recorded Book Value	$ 101,065	$ 101,040
Subordinated Debt
Subordinated Borrowing [Line Items]
Face Value	98,889
TriCo Cap Trust I
Subordinated Borrowing [Line Items]
Recorded Book Value	20,619	20,619
TriCo Cap Trust I \| Subordinated Debt
Subordinated Borrowing [Line Items]
Face Value	$ 20,619
Current Coupon Rate	8.31%
TriCo Cap Trust II
Subordinated Borrowing [Line Items]
Recorded Book Value	$ 20,619	20,619
TriCo Cap Trust II \| Subordinated Debt
Subordinated Borrowing [Line Items]
Face Value	$ 20,619
Current Coupon Rate	7.82%
North Valley Trust II
Subordinated Borrowing [Line Items]
Recorded Book Value	$ 5,551	5,503
North Valley Trust II \| Subordinated Debt
Subordinated Borrowing [Line Items]
Face Value	$ 6,186
Current Coupon Rate	8.55%
North Valley Trust III
Subordinated Borrowing [Line Items]
Recorded Book Value	$ 4,426	4,383
North Valley Trust III \| Subordinated Debt
Subordinated Borrowing [Line Items]
Face Value	$ 5,155
Current Coupon Rate	8.07%
North Valley Trust IV
Subordinated Borrowing [Line Items]
Recorded Book Value	$ 7,502	7,393
North Valley Trust IV \| Subordinated Debt
Subordinated Borrowing [Line Items]
Face Value	$ 10,310
Current Coupon Rate	6.88%
VRB Subordinated - 6%
Subordinated Borrowing [Line Items]
Recorded Book Value	$ 17,093	17,187
VRB Subordinated - 6% \| Subordinated Debt
Subordinated Borrowing [Line Items]
Interest rate	6.00%
Face Value	$ 16,000
Current Coupon Rate	6.00%
VRB Subordinated - 5%
Subordinated Borrowing [Line Items]
Recorded Book Value	$ 25,255	$ 25,336
VRB Subordinated - 5% \| Subordinated Debt
Subordinated Borrowing [Line Items]
Interest rate	5.00%
Face Value	$ 20,000
Current Coupon Rate	5.00%
LIBOR PLUS \| TriCo Cap Trust I \| Subordinated Debt
Subordinated Borrowing [Line Items]
Coupon Rate (Variable) 3 mo. LIBOR +	3.05%
LIBOR PLUS \| TriCo Cap Trust II \| Subordinated Debt
Subordinated Borrowing [Line Items]
Coupon Rate (Variable) 3 mo. LIBOR +	2.55%
LIBOR PLUS \| North Valley Trust II \| Subordinated Debt
Subordinated Borrowing [Line Items]
Coupon Rate (Variable) 3 mo. LIBOR +	3.25%
LIBOR PLUS \| North Valley Trust III \| Subordinated Debt
Subordinated Borrowing [Line Items]
Coupon Rate (Variable) 3 mo. LIBOR +	2.80%
LIBOR PLUS \| North Valley Trust IV \| Subordinated Debt
Subordinated Borrowing [Line Items]
Coupon Rate (Variable) 3 mo. LIBOR +	1.33%

Preferred securities redeemable interest rate.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

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

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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