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Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 shares | Dec. 31, 2021 shares | Apr. 30, 2019 shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding options under the plan (in shares) | 7,500 | 15,500 | 78,825 |
Options granted (in shares) | 0 | 0 |  |
Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Number of units outstanding expected to vest (in shares) | 123,102 | 114,481 |  |
Pre-tax compensation costs | $ | $ 2.3 |  |  |
Number of units released (in shares) | 55,928 |  |  |
Restricted Stock Units (RSUs) | Service Condition Vesting RSUs |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Number of units outstanding expected to vest (in shares) | 144,487 | 139,194 |  |
Pre-tax compensation costs | $ | $ 4.0 |  |  |
Number of units released (in shares) | 81,902 |  |  |
Minimum | Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Number of units released (in shares) | 0 |  |  |
Maximum | Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Number of units released (in shares) | 184,653 |  |  |
2009 Plan |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding options under the plan (in shares) | 7,500 |  |  |
2019 Plan |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Aggregate number of shares of TriCo's common stock issued |  |  |  | 1,500,000
Percentage of shares acquired | 0.50 |  |  |
Common stock issued pursuant to stock option (in shares) | 1 |  |  |
Common stock issued pursuant to performance award (in shares) | 2 |  |  |
Outstanding options under the plan (in shares) | 0 |  |  |
Options granted (in shares) | 0 | 0 | 0 |
2019 Plan | Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
RSUs outstanding (in shares) | 144,487 |  |  |
2019 Plan | Minimum |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Award vesting period | 1 year |  |  |
2019 Plan | Maximum |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options available for grant under the plan (in shares) | 517,773 |  |  |

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