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Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Apr. 16, 2019
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |
Weighted-average remaining contractual term (in years) | 1 year 2 months 12 days |  |  |
Number of units released (in shares) | 0 |  |  |
Number of units increased (in shares) | 122,423 |  |  |
Restricted Stock Units (RSUs) | Service Condition Vesting RSUs |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |
RSUs granted (in shares) | 0 |  |  |
Number of units outstanding expected to vest (in shares) | 100,057 |  | 99,809 |
Pre-tax compensation costs | $ 2,058 |  |  |
Number of units released (in shares) | 201 |  |  |
Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |
RSUs granted (in shares) | 0 |  |  |
Number of units outstanding expected to vest (in shares) | 81,615 |  | 81,615 |
Weighted-average remaining contractual term (in years) | 1 year 7 months 6 days |  |  |
Pre-tax compensation costs | $ 1,096 |  |  |
Number of units released (in shares) | 0 |  |  |
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
RSUs granted (in shares) | 0 | 0 |  |

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Release In Period + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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