Noninterest Income and Expense - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Mortgage loan servicing fees, net of change in fair value of mortgage loan servicing rights	$ 28,000	$ 239,000

Change in fair value of mortgage loan servicing rights.

No definition available.

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