Retirement Plans - Schedule of Deferred Compensation Earnings Credits Included in Noninterest Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Deferred compensation earnings credits included in noninterest expense	$ 462	$ 478	$ 487

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