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Loans and Allowance for Loan and Lease Losses - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable          
Gross loans $ 1,278,981,000   $ 1,278,981,000   $ 1,126,339,000
Loans and leases receivable sold 5,800,000 $ 3,000,000.0 5,800,000 $ 10,100,000  
Gain on sales of loan 535,000 265,000 535,000 866,000  
Loans and leases receivable purchased $ 0 81,000,000.0 $ 0 123,100,000  
Loans and leases receivable, allowance, length of historical and industry loss factors     4 years    
Loans greater than 90 days and accruing, count | loan 4   4    
Loans greater than 90 days and accruing $ 3,700,000   $ 3,700,000   0
Impaired loans with no specific reserves 15,808,000   15,808,000   14,577,000
Impaired loans, impaired in prior year 9,200,000   9,200,000    
Interest that would have been earned had impaired loans remained current in accordance with original terms 524,000 $ 50,000 1,500,000 $ 54,000  
Troubled debt restructurings, totals $ 130,000   $ 130,000   0
Subsequent default, number of contracts | loan 0 0 0 0  
Commercial loans          
Accounts, Notes, Loans and Financing Receivable          
Gross loans $ 614,737,000   $ 614,737,000   409,420,000
Loans and leases receivable purchased   $ 81,000,000.0   $ 39,900,000  
Impaired loans with no specific reserves 9,244,000   9,244,000   7,996,000
Consumer loans          
Accounts, Notes, Loans and Financing Receivable          
Gross loans 83,736,000   83,736,000   90,867,000
Impaired loans with no specific reserves 261,000   261,000   74,000
PPP | Commercial loans          
Accounts, Notes, Loans and Financing Receivable          
Gross loans 281,000,000.0   281,000,000.0    
Federal Reserve Bank Of San Francisco | Commercial loans          
Accounts, Notes, Loans and Financing Receivable          
Loans pledged to secure borrowings obtained from the FHLB and FRB 160,000,000   160,000,000    
Federal Reserve Bank Of San Francisco | Consumer loans          
Accounts, Notes, Loans and Financing Receivable          
Loans pledged to secure borrowings obtained from the FHLB and FRB         210,000,000
Federal Home Loan Bank of San Francisco          
Accounts, Notes, Loans and Financing Receivable          
Loans pledged to secure borrowings obtained from the FHLB and FRB $ 443,000,000   $ 443,000,000   $ 278,000,000