XML 13 R1.htm IDEA: XBRL DOCUMENT v3.22.1
Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Mar. 14, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Registrant Name First Seacoast Bancorp    
Entity Central Index Key 0001769267    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Address, State or Province NH    
Entity Shell Company false    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Small Business true    
Trading Symbol FSEA    
Security Exchange Name NASDAQ    
Title of 12(b) Security Common stock, par value $0.01 per share    
Entity Common Stock, Shares Outstanding   6,102,754  
Entity Public Float     $ 24.8
Entity Incorporation, State or Country Code X1    
Entity File Number 001-38985    
Entity Tax Identification Number 84-2404519    
Entity Address, Address Line One 633 Central Avenue    
Entity Address, City or Town Dover    
Entity Address, Postal Zip Code 03820    
City Area Code 603    
Local Phone Number 742-4680    
Document Annual Report true    
Document Transition Report false    
Auditor Firm ID 231    
Auditor Name Baker Newman & Noyes LLC    
Auditor Location Portland, Maine    
Documents Incorporated by Reference

1.

Portions of the Registrant’s Definitive Proxy Statement relating to the Annual Meeting of Stockholders, scheduled to be held on May 26, 2022, are incorporated by reference into Part III of this report.