Cash Value of Life Insurance - Additional Information (Detail)	3 Months Ended
Mar. 31, 2015 Company Policies	Mar. 31, 2014 Company
Insurance [Abstract]
Number of life insurance policies owned by the Company	189
Insurance companies used	14tcbk_InsuranceCompaniesUsed	6tcbk_InsuranceCompaniesUsed
Policies covering current and former employees and directors	60

Policies covering current and former employees and directors.

No definition available.

Name:	tcbk_PoliciesCoveringCurrentAndFormerEmployeesAndDirectors
Namespace Prefix:	tcbk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant