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Subsequent Event	9 Months Ended
Subsequent Event	Sep. 30, 2015
Subsequent Events [Abstract]
Subsequent Event	Note 31 – Subsequent Event On October 28, 2015, TriCo announced that its subsidiary, Tri Counties Bank, has entered into an agreement to purchase three branches on the North Coast of California from Bank of America. The branches are located in the cities of Arcata, Eureka, and Fortuna in Humboldt County. TriCo anticipates assuming approximately $245 million in deposits and purchasing approximately $400 thousand in loans and will pay a premium of 1.91% on the deposits assumed. Subject to regulatory approvals, the transaction is scheduled to occur in the first quarter of 2016.