<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xml:lang="en-US"
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2020-01-31"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="tcbk-20220428.xsd" xlink:type="simple"/>
    <context id="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000356171</identifier>
        </entity>
        <period>
            <startDate>2022-04-28</startDate>
            <endDate>2022-04-28</endDate>
        </period>
    </context>
    <dei:AmendmentFlag
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV80L2ZyYWc6OTM4YTk5YTRjMDhhNGUzYmJlNzNhODdlZWZiZTI5MTgvdGFibGU6OWFkMDQxY2I5ZjY4NGYwMTk4ZGNmZDNiNGZiZWZmMzkvdGFibGVyYW5nZTo5YWQwNDFjYjlmNjg0ZjAxOThkY2ZkM2I0ZmJlZmYzOV8xLTEtMS0xLTM2NTAw_132bfb15-0557-471a-bc22-3b29ec530f14">false</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV80L2ZyYWc6OTM4YTk5YTRjMDhhNGUzYmJlNzNhODdlZWZiZTI5MTgvdGFibGU6OWFkMDQxY2I5ZjY4NGYwMTk4ZGNmZDNiNGZiZWZmMzkvdGFibGVyYW5nZTo5YWQwNDFjYjlmNjg0ZjAxOThkY2ZkM2I0ZmJlZmYzOV8yLTEtMS0xLTM2NTAw_4dbe661e-5461-4e7b-b3da-73d81dc33105">0000356171</dei:EntityCentralIndexKey>
    <dei:EntityRegistrantName
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV80L2ZyYWc6OTM4YTk5YTRjMDhhNGUzYmJlNzNhODdlZWZiZTI5MTgvdGFibGU6OWFkMDQxY2I5ZjY4NGYwMTk4ZGNmZDNiNGZiZWZmMzkvdGFibGVyYW5nZTo5YWQwNDFjYjlmNjg0ZjAxOThkY2ZkM2I0ZmJlZmYzOV8zLTEtMS0xLTM2NTAw_2f43dbd4-ecdb-4e06-a148-648617ebbf26">TriCo Bancshares</dei:EntityRegistrantName>
    <dei:DocumentType
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGV4dHJlZ2lvbjo2NmVkZmE5YWZmMDk0ZjBhYWVlNzQ4N2M3NTEzM2IzOF8xMjUx_453398e1-48c2-4e20-b263-828bafe72870">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGV4dHJlZ2lvbjo2NmVkZmE5YWZmMDk0ZjBhYWVlNzQ4N2M3NTEzM2IzOF8yNTc_a0bc7fa6-987d-47fc-aeda-03f0bed6f90a">2022-04-28</dei:DocumentPeriodEndDate>
    <dei:EntityIncorporationStateCountryCode
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGFibGU6OGM4N2UzZDY1YThiNDdjYmFhNWY2NzZiOGMyYzNhYTcvdGFibGVyYW5nZTo4Yzg3ZTNkNjVhOGI0N2NiYWE1ZjY3NmI4YzJjM2FhN18wLTAtMS0xLTM2NTAw_a26af19a-d2ee-4efd-a6f8-f28c9079de86">CA</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGFibGU6OGM4N2UzZDY1YThiNDdjYmFhNWY2NzZiOGMyYzNhYTcvdGFibGVyYW5nZTo4Yzg3ZTNkNjVhOGI0N2NiYWE1ZjY3NmI4YzJjM2FhN18wLTEtMS0xLTM2NTAw_f2c96e2e-d217-40bd-8deb-037cad656f84">0-10661</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGFibGU6OGM4N2UzZDY1YThiNDdjYmFhNWY2NzZiOGMyYzNhYTcvdGFibGVyYW5nZTo4Yzg3ZTNkNjVhOGI0N2NiYWE1ZjY3NmI4YzJjM2FhN18wLTItMS0xLTM2NTAw_1af3768f-4f73-47ed-adc8-faaff207fbda">94-2792841</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGFibGU6ZTU1MzRjZWQyN2QzNGIyYWIyZGQ5YWJmMzlkNDA0N2IvdGFibGVyYW5nZTplNTUzNGNlZDI3ZDM0YjJhYjJkZDlhYmYzOWQ0MDQ3Yl8wLTAtMS0xLTM2NTAw_0ec7c0a1-2c8e-4c2d-9849-a01d54c9f0d7">63 Constitution Drive</dei:EntityAddressAddressLine1>
    <dei:EntityAddressCityOrTown
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGFibGU6ZTU1MzRjZWQyN2QzNGIyYWIyZGQ5YWJmMzlkNDA0N2IvdGFibGVyYW5nZTplNTUzNGNlZDI3ZDM0YjJhYjJkZDlhYmYzOWQ0MDQ3Yl8wLTEtMS0xLTM2NTAw_04e02d7f-5fa1-4a65-9741-fac181cb4dc6">Chico,</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGFibGU6ZTU1MzRjZWQyN2QzNGIyYWIyZGQ5YWJmMzlkNDA0N2IvdGFibGVyYW5nZTplNTUzNGNlZDI3ZDM0YjJhYjJkZDlhYmYzOWQ0MDQ3Yl8wLTItMS0xLTM2NTAw_383ba5b1-019c-4380-b2e6-573658a47539">CA</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGFibGU6ZTU1MzRjZWQyN2QzNGIyYWIyZGQ5YWJmMzlkNDA0N2IvdGFibGVyYW5nZTplNTUzNGNlZDI3ZDM0YjJhYjJkZDlhYmYzOWQ0MDQ3Yl8wLTMtMS0xLTM2NTAw_7513c820-a671-4edc-bb91-935be061865e">95973</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGV4dHJlZ2lvbjo2NmVkZmE5YWZmMDk0ZjBhYWVlNzQ4N2M3NTEzM2IzOF80MjE_9259064f-174c-4d64-9b2b-20f631116b10">530</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGV4dHJlZ2lvbjo2NmVkZmE5YWZmMDk0ZjBhYWVlNzQ4N2M3NTEzM2IzOF80MjU_bed7958d-45e9-4f14-af81-c8c241200c00">898-0300</dei:LocalPhoneNumber>
    <dei:WrittenCommunications
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGFibGU6NmQ0N2Y2NmI0MTdkNDA4NDhiYTU5MzhhNDZiMzZiNWEvdGFibGVyYW5nZTo2ZDQ3ZjY2YjQxN2Q0MDg0OGJhNTkzOGE0NmIzNmI1YV8wLTAtMS0xLTM2NTAw_b37b14f5-653f-42a4-b97a-90391f26a522">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGFibGU6YzhiZjc2ZjJhMjczNDQ1OGI0Yjc0ZTZkZjFjNzNkYTgvdGFibGVyYW5nZTpjOGJmNzZmMmEyNzM0NDU4YjRiNzRlNmRmMWM3M2RhOF8wLTAtMS0xLTM2NTAw_483d6750-aae1-4d61-9d8c-d05ba3830434">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGFibGU6ZDhjYWY5M2QxMGNjNDNlMjg5NzVmNDIxYWM1M2ZiYzcvdGFibGVyYW5nZTpkOGNhZjkzZDEwY2M0M2UyODk3NWY0MjFhYzUzZmJjN18wLTAtMS0xLTM2NTAw_62009efd-4ee2-4f64-857e-661113209214">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGFibGU6YWEwMmUzNmU2YzAyNDYyZDgwYWNmNDRkMmQ0M2E5ZGQvdGFibGVyYW5nZTphYTAyZTM2ZTZjMDI0NjJkODBhY2Y0NGQyZDQzYTlkZF8wLTAtMS0xLTM2NTAw_4d10f776-ca2c-4c80-af41-a9d94bb81c24">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGFibGU6OTU4Y2VhY2NkMjNlNDE0M2EwYTJiMTQ4NjBhZDI1ZTEvdGFibGVyYW5nZTo5NThjZWFjY2QyM2U0MTQzYTBhMmIxNDg2MGFkMjVlMV8xLTAtMS0xLTM2NTAw_ce310ac7-1215-4fee-9ab9-2cce2c26aecd">Common Stock, no par value</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGFibGU6OTU4Y2VhY2NkMjNlNDE0M2EwYTJiMTQ4NjBhZDI1ZTEvdGFibGVyYW5nZTo5NThjZWFjY2QyM2U0MTQzYTBhMmIxNDg2MGFkMjVlMV8xLTItMS0xLTM2NTAw_a3d6a043-5228-4296-8f43-747661e77075">TCBK</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGFibGU6OTU4Y2VhY2NkMjNlNDE0M2EwYTJiMTQ4NjBhZDI1ZTEvdGFibGVyYW5nZTo5NThjZWFjY2QyM2U0MTQzYTBhMmIxNDg2MGFkMjVlMV8xLTQtMS0xLTM2NTAw_9f5cb8c6-061d-4ef2-ae1d-091efa97ea0f">NASDAQ</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany
      contextRef="ifec4e40adc544b5e928f460dbfa06c11_D20220428-20220428"
      id="id3VybDovL2RvY3MudjEvZG9jOmNkM2I5MWU4NTAwNzRmZGI5NzJhYTYxY2Q4ZmJhMzhhL3NlYzpjZDNiOTFlODUwMDc0ZmRiOTcyYWE2MWNkOGZiYTM4YV8xL2ZyYWc6NjZlZGZhOWFmZjA5NGYwYWFlZTc0ODdjNzUxMzNiMzgvdGV4dHJlZ2lvbjo2NmVkZmE5YWZmMDk0ZjBhYWVlNzQ4N2M3NTEzM2IzOF85OTM_c7bcda28-a748-4233-a978-7a8382884197">false</dei:EntityEmergingGrowthCompany>
</xbrl>
