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