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Document and Entity Information
Mar. 22, 2021
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Mar. 22, 2021
Entity Registrant Name COASTAL FINANCIAL CORP
Entity Central Index Key 0001437958
Entity Emerging Growth Company true
Entity Ex Transition Period true
Entity File Number 001-38589
Entity Incorporation State Country Code WA
Entity Tax Identification Number 56-2392007
Entity Address Address Line1 5415 Evergreen Way
Entity Address City Or Town Everett
Entity Address State Or Province WA
Entity Address Postal Zip Code 98203
City Area Code 425
Local Phone Number 257-9000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Title of 12(b) Security Common stock, no par value per share
Trading Symbol CCB
Name of each exchange on which registered NASDAQ