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Description of Business and Summary of Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Dec. 31, 2022
USD ($)
segment
branch
$ / shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Description Of Business And Summary Of Accounting Policies [Line Items]      
Number of reportable segments | segment 2    
Number of branches | branch 14    
Investment percentage in capital stock of FHLB, outstanding advances 4.00%    
Investment percentage in capital stock of FHLB, total assets 0.12%    
Federal home loan bank stock shares redeemed per share par value (in usd per share) | $ / shares $ 1    
Investment in federal home loan bank stock $ 3,200,000 $ 3,100,000  
Reserve for unfunded commitments 974,000 1,300,000  
Unrecognized tax benefits 0 0  
Unrecognized tax benefits, income tax penalties and interest expense 0 0  
Advertising costs $ 351,000 451,000  
Minimum      
Description Of Business And Summary Of Accounting Policies [Line Items]      
Estimated useful lives of the assets 3 years    
Maximum      
Description Of Business And Summary Of Accounting Policies [Line Items]      
Estimated useful lives of the assets 39 years    
SBA and USDA      
Description Of Business And Summary Of Accounting Policies [Line Items]      
Loans held for sale $ 0 0  
SBA | Other Assets      
Description Of Business And Summary Of Accounting Policies [Line Items]      
Servicing assets 183,000    
USDA      
Description Of Business And Summary Of Accounting Policies [Line Items]      
Loans serviced 14,300,000 19,300,000  
USDA | Other Assets      
Description Of Business And Summary Of Accounting Policies [Line Items]      
Servicing assets   269,000  
Federal Reserve Bank Stock      
Description Of Business And Summary Of Accounting Policies [Line Items]      
Investment in federal reserve bank stock 4,300,000 2,800,000  
Pacific Coast Banker's Bancshares      
Description Of Business And Summary Of Accounting Policies [Line Items]      
Investment at cost 100,000 100,000  
Specialized Bank Technology Company      
Description Of Business And Summary Of Accounting Policies [Line Items]      
Investment at cost 2,200,000    
Unrealized holding gain on equity investment 1,500,000    
Technology Company      
Description Of Business And Summary Of Accounting Policies [Line Items]      
Unrealized loss (gain) on equity investment 100,000    
Equity investment, amount 500,000    
Equity investment, fair value 0 100,000  
Contribution of investments 350,000 0  
Investment Equity Funds      
Description Of Business And Summary Of Accounting Policies [Line Items]      
Contribution of investments 349,000 163,000  
Realized investment losses 53,000 3,000  
Equity interest investments 456,000 160,000 $ 0
Capital commitment of an investment 988,000    
CCBX Loans      
Description Of Business And Summary Of Accounting Policies [Line Items]      
Loans receivable 152,500,000    
Loans held for sale $ 0 $ 0