Retirement Plans - Schedule of Deferred Compensation Earnings Credits Included in Noninterest Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Deferred compensation earnings credits included in non-interest expense	$ 212	$ 363	$ 462

Deferred compensation arrangements non interest expense.

No definition available.

Name:	tcbk_DeferredCompensationArrangementsNonInterestExpense
Namespace Prefix:	tcbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration