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Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022 | Apr. 16, 2019
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |
Weighted-average remaining contractual term (in years) | 2 years 1 month 6 days |  |
Number of units released (in shares) | 0 |  |
Number of units increased (in shares) | 185,790 |  |
Restricted Stock Units (RSUs) | Service Condition Vesting RSUs |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |
Number of units outstanding expected to vest (in shares) | 153,284 | 139,194 |
Pre-tax compensation costs | $ 4.8 |  |
Number of units released (in shares) | 72,847 |  |
Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |
Number of units outstanding expected to vest (in shares) | 123,860 | 114,481 |
Weighted-average remaining contractual term (in years) | 2 years 2 months 12 days |  |
Pre-tax compensation costs | $ 2.7 |  |
Number of units released (in shares) | 55,928 |  |
2019 Plan |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |
Aggregate number of shares of TriCo's common stock issued (in shares) |  |  | 1,500,000

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