Leases - Additional Information (Detail)	9 Months Ended
Sep. 30, 2021 renewalOption
Leases [Abstract]
Number of lease renewal options (in renewal options)	1

Lessee, Operating Lease, Number of Renewal Term Options

No definition available.

Name:	tcbk_LesseeOperatingLeaseNumberOfRenewalTermOptions
Namespace Prefix:	tcbk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration