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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, 2023 | Dec. 31, 2022 | Mar. 25, 2022
Subordinated Borrowing [Line Items] |  |  |
Recorded Book Value | $ 101,099 | $ 101,040 |
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 | 8.71% |  |
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 | 8.22% |  |
North Valley Trust II |  |  |
Subordinated Borrowing [Line Items] |  |  |
Recorded Book Value | $ 5,602 | 5,503 |
North Valley Trust II | Senior Subordinated Notes |  |  |
Subordinated Borrowing [Line Items] |  |  |
Face Value | $ 6,186 |  |
Current Coupon Rate | 8.89% |  |
North Valley Trust III |  |  |
Subordinated Borrowing [Line Items] |  |  |
Recorded Book Value | $ 4,472 | 4,383 |
North Valley Trust III | Senior Subordinated Notes |  |  |
Subordinated Borrowing [Line Items] |  |  |
Face Value | $ 5,155 |  |
Current Coupon Rate | 8.47% |  |
North Valley Trust IV |  |  |
Subordinated Borrowing [Line Items] |  |  |
Recorded Book Value | $ 7,615 | 7,393 |
North Valley Trust IV | Senior Subordinated Notes |  |  |
Subordinated Borrowing [Line Items] |  |  |
Face Value | $ 10,310 |  |
Current Coupon Rate | 6.98% |  |
VRB Subordinated - 6% |  |  |
Subordinated Borrowing [Line Items] |  |  |
Recorded Book Value | $ 17,000 | 17,187 |
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 | $ 25,172 | $ 25,336 |
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 | TriCo Cap Trust I | Senior Subordinated Notes |  |  |
Subordinated Borrowing [Line Items] |  |  |
Coupon Rate (Variable) 3 mo. SOFR + | 3.05% |  |
LIBOR | TriCo Cap Trust II | Senior Subordinated Notes |  |  |
Subordinated Borrowing [Line Items] |  |  |
Coupon Rate (Variable) 3 mo. SOFR + | 2.55% |  |
LIBOR | North Valley Trust II | Senior Subordinated Notes |  |  |
Subordinated Borrowing [Line Items] |  |  |
Coupon Rate (Variable) 3 mo. SOFR + | 3.25% |  |
LIBOR | North Valley Trust III | Senior Subordinated Notes |  |  |
Subordinated Borrowing [Line Items] |  |  |
Coupon Rate (Variable) 3 mo. SOFR + | 2.80% |  |
LIBOR | North Valley Trust IV | Senior Subordinated Notes |  |  |
Subordinated Borrowing [Line Items] |  |  |
Coupon Rate (Variable) 3 mo. SOFR + | 1.33% |  |

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