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Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Apr. 16, 2024 | Dec. 31, 2023 | Apr. 16, 2019
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |
Weighted-average remaining contractual term (in years) | 1 year 8 months 12 days |  |  |
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) | 162,164 |  | 144,487 |
Pre-tax compensation costs | $ 4.4 |  |  |
Number of units released (in shares) | 69,043 |  |  |
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) | 146,448 |  | 123,102 |
Weighted-average remaining contractual term (in years) | 1 year 9 months 18 days |  |  |
Pre-tax compensation costs | $ 2.3 |  |  |
Number of units released (in shares) | 32,248 |  |  |
Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs | Minimum |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |
Number of units released (in shares) | 0 |  |  |
Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs | Maximum |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |
Number of units released (in shares) | 219,672 |  |  |
2024 Plan |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |
Aggregate number of shares of TriCo's common stock issued (in shares) |  | 1,200,000 |  |
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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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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