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Subsequent Events - Additional Information (Detail)
Jan. 19, 2023
$ / shares
shares
Jan. 17, 2023
USD ($)
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Subsequent Event [Line Items]        
Common stock issued     6,201,770 6,201,770
Common stock, price per share | $ / shares     $ 0.01 $ 0.01
Common stock outstanding     6,064,298 6,123,337
Cash in collateral returned | $     $ 8,250,000 $ 6,638,000
Subsequent Event [Member] | First Seacoast Bancorp, Inc [Member]        
Subsequent Event [Line Items]        
Common stock shares sold 2,805,000      
Common stock, price per share | $ / shares $ 10.00      
Common stock outstanding 5,077,492      
Common stock coversion ratio 0.8358      
Offering price | $ / shares $ 10.00      
Subsequent Event [Member] | First Seacoast Bancorp, Inc [Member] | First Seacoast Bank Employee Stock Ownership Plan [Member]        
Subsequent Event [Line Items]        
Common stock issued 224,400      
Subsequent Event [Member] | Interest Rate Swaps [Member]        
Subsequent Event [Line Items]        
Gain on derivative | $   $ 849,000    
Cash in collateral returned | $   $ 536,000