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Document and Entity Information
Feb. 23, 2023
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Feb. 23, 2023
Current Fiscal Year End Date --12-31
Entity Registrant Name First Seacoast Bancorp, Inc.
Entity Incorporation, State or Country Code MD
Entity File Number 001-41597
Entity Tax Identification Number 92-0334805
Entity Address, Address Line One 633 Central Avenue
Entity Address, City or Town Dover
Entity Address, State or Province NH
Entity Address, Postal Zip Code 03820
City Area Code 603
Local Phone Number 742-4680
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Central Index Key 0001943802
Title of 12(b) Security Common stock, par value $0.01 per share
Trading Symbol FSEA
Security Exchange Name NASDAQ