Retirement Plans - Schedule of Deferred Compensation Earnings Credits Included in Noninterest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Compensation Related Costs [Abstract]
Deferred compensation earnings credits included in noninterest expense	$ 111	$ 126	$ 366	$ 412

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