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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2022
Mar. 07, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2022    
Document Transition Report false    
Entity File Number 001-38589    
Entity Registrant Name COASTAL FINANCIAL CORPORATION    
Entity Incorporation, State or Country Code WA    
Entity Tax Identification Number 56-2392007    
Entity Address, Address Line One 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    
Title of 12(b) Security Common Stock, no par value per share    
Trading Symbol CCB    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company true    
Entity Ex Transition Period true    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 407,411,922
Entity Common Stock, Shares Outstanding   13,215,258  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the Registrant’s Definitive Proxy Statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A for its 2023 Annual Meeting of Shareholders are incorporated by reference into Part III of this Annual Report on Form 10-K.
    
Amendment Flag false    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001437958