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Borrowings, FHLB Stock and Subordinated Notes - Narrative (Details) - USD ($)
1 Months Ended 9 Months Ended
Oct. 01, 2025
Sep. 30, 2020
Sep. 30, 2025
Dec. 31, 2024
Short-term Debt [Line Items]        
Investment in FHLB stock     $ 1,735,000 $ 1,730,000
Subordinated notes, net     11,791,000 11,759,000
Subordinated Debt        
Short-term Debt [Line Items]        
Subordinated notes, net     11,800,000 11,800,000
Subordinated Debt | Subsequent Event        
Short-term Debt [Line Items]        
Aggregate principal amount $ 12,000,000.0      
Redeemed notes $ 4,000,000.0      
Subordinated Debt | Period before October 1, 2025        
Short-term Debt [Line Items]        
Interest rate (as a percent)   5.25%    
Subordinated Debt | Period after October 1, 2025        
Short-term Debt [Line Items]        
Basis spread on variable rate   5.13%    
Federal Reserve Bank of San Francisco        
Short-term Debt [Line Items]        
Outstanding borrowings     0 0
Pacific Coast Banker's Bank | Line of Credit        
Short-term Debt [Line Items]        
Amount available to borrow under loan agreement     $ 20,000,000.0  
Term period (in years)     1 year  
Outstanding borrowings     $ 0 0
Asset Pledged as Collateral | Federal Reserve Bank of San Francisco        
Short-term Debt [Line Items]        
Amount available to borrow under loan agreement     $ 19,500,000 $ 20,800,000