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Borrowing Arrangements (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Borrowing Arrangements    
Investments securing FHLB advances, amortized cost $ 533,964,000  
Available-for-sale debt securities 544,502,000 $ 470,746,000
Federal funds purchased 0 0
Federal Home Loan Bank Advances    
Borrowing Arrangements    
Loans Pledged as Collateral 438,589,000  
Remaining borrowing capacity 255,973,000  
Federal Home Loan Bank Advances | Securities Pledged as Collateral    
Borrowing Arrangements    
Investments securing FHLB advances, amortized cost 197,000 248,000
Available-for-sale debt securities 208,000 $ 256,000
San Fransisco Branch    
Borrowing Arrangements    
Advances from FHLB $ 0