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Borrowings, FHLB Stock and Subordinated Notes - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Sep. 30, 2020
Mar. 31, 2025
Dec. 31, 2024
Short-term Debt [Line Items]      
Investment in FHLB stock   $ 1,734,000 $ 1,730,000
Subordinated notes, net   11,770,000 11,759,000
Subordinated Debt      
Short-term Debt [Line Items]      
Aggregate principal amount $ 12,000,000.0    
Subordinated notes, net   11,800,000 11,800,000
Subordinated Debt | Period before October 1, 2025      
Short-term Debt [Line Items]      
Interest rate 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   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   $ 20,300,000 $ 20,800,000