v3.25.4
Cover
Mar. 12, 2026
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Mar. 12, 2026
Entity File Number 001-41684
Entity Registrant Name California BanCorp \ CA
Entity Central Index Key 0001795815
Entity Tax Identification Number 84-3288397
Entity Incorporation, State or Country Code CA
Entity Address, Address Line One 12265 El Camino Real
Entity Address, Address Line Two Suite 210
Entity Address, City or Town San Diego
Entity Address, State or Province CA
Entity Address, Postal Zip Code 92310
City Area Code (844)
Local Phone Number 265-7622
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock
Trading Symbol BCAL
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period true