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Loans and Allowance for Credit Losses on Loans - Schedule of Collateral-Dependent Non-Accrual Loans (Details) - USD ($)
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for credit losses $ 22,963,000 $ 22,539,000 $ 23,023,000 $ 22,414,000 $ 19,100,000 $ 22,874,000
Weighted average ratio of loans value to collateral dependent loans value 66.00%   67.00%      
Other residential | Federal Reserve Bank            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collateral pledged $ 105,700,000   $ 106,200,000      
Federal Home Loan Bank of San Francisco            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collateral pledged 1,300,000,000   1,330,000,000      
Commercial Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans 9,846,000   7,963,000      
Residential Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans 699,000   413,000      
Other            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans 92,000   0      
Collateral Pledged            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans 10,637,000   8,376,000      
Allowance for credit losses 0   0      
Commercial real estate loans | Commercial owner-occupied            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for credit losses 2,536,000 2,617,000 2,776,000 2,566,000 2,037,000 2,778,000
Commercial real estate loans | Commercial owner-occupied | Commercial Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans 9,846,000   7,269,000      
Commercial real estate loans | Commercial owner-occupied | Residential Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans 0   0      
Commercial real estate loans | Commercial owner-occupied | Other            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans 0   0      
Commercial real estate loans | Commercial owner-occupied | Collateral Pledged            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans 9,846,000   7,269,000      
Allowance for credit losses 0   0      
Commercial real estate loans | Commercial investor-owned            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for credit losses 12,738,000 12,439,000 12,739,000 12,305,000 10,761,000 12,682,000
Commercial real estate loans | Commercial investor-owned | Commercial Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans     694,000      
Commercial real estate loans | Commercial investor-owned | Residential Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans     0      
Commercial real estate loans | Commercial investor-owned | Other            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans     0      
Commercial real estate loans | Commercial investor-owned | Collateral Pledged            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans     694,000      
Allowance for credit losses     0      
Commercial real estate loans | Installment and other consumer loans | Commercial Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans 0          
Commercial real estate loans | Installment and other consumer loans | Residential Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans 0          
Commercial real estate loans | Installment and other consumer loans | Other            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans 92,000          
Commercial real estate loans | Installment and other consumer loans | Collateral Pledged            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans 92,000          
Allowance for credit losses 0          
Residential loans | Home equity            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for credit losses 542,000 530,000 595,000 659,000 412,000 738,000
Residential loans | Home equity | Commercial Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans 0   0      
Residential loans | Home equity | Residential Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans 699,000   413,000      
Residential loans | Home equity | Other            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans 0   0      
Residential loans | Home equity | Collateral Pledged            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Non-accrual loans 699,000   413,000      
Allowance for credit losses 0   0      
Residential loans | Other residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for credit losses 590,000 $ 585,000 644,000 $ 623,000 $ 613,000 $ 998,000
Residential loans | Other residential | Collateral Pledged            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Nonaccrual collateral dependent loans in process of foreclosure $ 0   $ 0