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Investment Securities - Summary of Securities Available For Sale By Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items]    
Amortized cost $ 128,974 $ 101,335
Fair value due in one year or less 20,096 8,698
Fair value due after one year through five years 66,586 67,335
Fair value 118,098 91,352
Prepayment of Obligation [Member]    
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items]    
Amortized cost due in one year or less 285  
Amortized cost due after one year through five years 8,454  
Amortized cost due after five years through ten years 34,437  
Amortized cost due after ten years 12,140  
Amortized cost 128,974  
Fair value due in one year or less 284  
Fair value due after one year through five years 8,263  
Fair value due after five years through ten years 32,065  
Fair value due after ten years 10,250  
Fair value 118,098  
Mortgage-backed securities - U.S. Government Sponsored Enterprises (GSEs) [Member]    
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items]    
Amortized cost 71,266 48,399
Fair value due in one year or less 7,494 2,858
Fair value due after one year through five years 30,206 31,398
Fair value 64,841 42,634
Mortgage-backed securities - U.S. Government Sponsored Enterprises (GSEs) [Member] | Prepayment of Obligation [Member]    
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items]    
Amortized cost 71,266  
Fair value 64,841  
Small business association (SBA) securities [Member]    
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items]    
Amortized cost 2,392 2,617
Fair value due in one year or less 816 723
Fair value due after one year through five years 0 0
Fair value 2,395 $ 2,618
Small business association (SBA) securities [Member] | Prepayment of Obligation [Member]    
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items]    
Amortized cost 2,392  
Fair value $ 2,395