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Borrowing Arrangements - Federal Home Loan Bank Borrowings, Federal Reserve Bank Borrowings, and Available Lines of Credit (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
FHLB    
Borrowing Arrangements    
Securities pledged as collateral   $ 0
FHLB | Line of credit | FHLB of San Francisco    
Borrowing Arrangements    
FHLB overnight borrowings $ 0 0
FHLB    
Borrowing Arrangements    
Loans pledged as collateral   272,879,000
Securities pledged as collateral 3,202,000  
Amount outstanding 0  
Line of credit 3,041,000 $ 228,103,000
FHLB | Line of credit | FHLB of San Francisco    
Borrowing Arrangements    
Loans pledged as collateral 232,632,000  
Line of credit $ 160,523,000