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Document and Entity Information
Aug. 26, 2025
Entity Addresses [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Aug. 26, 2025
Current Fiscal Year End Date --12-31
Entity File Number 001-35424
Entity Registrant Name MECHANICS BANCORP
Entity Central Index Key 0001518715
Entity Incorporation, State or Country Code WA
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
Title of 12(b) Security Class A Common Stock, No Par Value
Trading Symbol MCHB
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Information, Former Legal or Registered Name HomeStreet, Inc.
Former Address [Member]  
Entity Addresses [Line Items]  
Entity Address, Address Line One 601 Union Street,
Entity Address, Address Line Two Ste. 2000
Entity Address, City or Town Seattle
Entity Address, State or Province WA
Entity Address, Postal Zip Code 98101