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Cover
Oct. 30, 2025
Cover [Abstract]  
Document Type 8-K
Document Period End Date Oct. 30, 2025
Entity Registrant Name MECHANICS BANCORP
Entity Incorporation, State or Country Code CA
Entity File Number 001-35424
Entity Tax Identification Number 91-0186600
Entity Address, Address Line One 1111 Civic Drive
Entity Address, City or Town Walnut Creek
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94596
City Area Code 925
Local Phone Number 482-8000
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Class A Common Stock, No Par Value
Trading Symbol MCHB
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Entity Central Index Key 0001518715
Amendment Flag false