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Loans and Allowance for Credit Losses on Loans - Loans Outstanding and Aging Analysis (Details) - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost $ 2,112,328,000   $ 2,092,546,000
Loans past due more than 90 days still accruing 0   0
Financing receivable, nonaccrual, earning interest on cash basis 0   0
Financing receivable, nonaccrual, interest income 0 $ 0  
Financing receivable, accrued interest, writeoff 16,000 $ 1,000  
Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 2,112,328,000   2,092,546,000
Non-accrual loans 2,026,000   2,432,000
Non-accrual loans with no allowance 2,023,000   2,432,000
Total past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 2,780,000   1,342,000
30-59 days past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 2,146,000   420,000
60-89 days past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 0   244,000
90 days or more past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 634,000   678,000
Current | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 2,109,548,000   2,091,204,000
Commercial loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 195,964,000   173,547,000
Commercial loans | Commercial and industrial | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 195,964,000   173,547,000
Non-accrual loans 0   0
Non-accrual loans with no allowance 0   0
Commercial loans | Commercial and industrial | Total past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 822,000   267,000
Commercial loans | Commercial and industrial | 30-59 days past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 822,000   3,000
Commercial loans | Commercial and industrial | 60-89 days past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 0   0
Commercial loans | Commercial and industrial | 90 days or more past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 0   264,000
Commercial loans | Commercial and industrial | Current | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 195,142,000   173,280,000
Commercial real estate loans | Commercial owner-occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 352,529,000   354,877,000
Commercial real estate loans | Commercial owner-occupied | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 352,529,000   354,877,000
Non-accrual loans 331,000   1,563,000
Non-accrual loans with no allowance 331,000   1,563,000
Commercial real estate loans | Commercial owner-occupied | Total past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 33,000   0
Commercial real estate loans | Commercial owner-occupied | 30-59 days past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 0   0
Commercial real estate loans | Commercial owner-occupied | 60-89 days past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 0   0
Commercial real estate loans | Commercial owner-occupied | 90 days or more past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 33,000   0
Commercial real estate loans | Commercial owner-occupied | Current | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 352,496,000   354,877,000
Commercial real estate loans | Commercial non-owner occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 1,189,962,000   1,191,889,000
Commercial real estate loans | Commercial non-owner occupied | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 1,189,962,000   1,191,889,000
Non-accrual loans 924,000   0
Non-accrual loans with no allowance 924,000   0
Commercial real estate loans | Commercial non-owner occupied | Total past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 924,000   0
Commercial real estate loans | Commercial non-owner occupied | 30-59 days past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 924,000   0
Commercial real estate loans | Commercial non-owner occupied | 60-89 days past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 0   0
Commercial real estate loans | Commercial non-owner occupied | 90 days or more past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 0   0
Commercial real estate loans | Commercial non-owner occupied | Current | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 1,189,038,000   1,191,889,000
Commercial real estate loans | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 110,386,000   114,373,000
Commercial real estate loans | Construction | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 110,386,000   114,373,000
Non-accrual loans 0   0
Non-accrual loans with no allowance 0   0
Commercial real estate loans | Construction | Total past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 0   0
Commercial real estate loans | Construction | 30-59 days past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 0   0
Commercial real estate loans | Construction | 60-89 days past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 0   0
Commercial real estate loans | Construction | 90 days or more past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 0   0
Commercial real estate loans | Construction | Current | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 110,386,000   114,373,000
Residential loans | Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 86,572,000   88,748,000
Residential loans | Home equity | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 86,572,000   88,748,000
Non-accrual loans 768,000   778,000
Non-accrual loans with no allowance 768,000   778,000
Residential loans | Home equity | Total past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 997,000   977,000
Residential loans | Home equity | 30-59 days past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 399,000   319,000
Residential loans | Home equity | 60-89 days past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 0   244,000
Residential loans | Home equity | 90 days or more past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 598,000   414,000
Residential loans | Home equity | Current | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 85,575,000   87,771,000
Residential loans | Other residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 116,447,000   112,123,000
Residential loans | Other residential | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 116,447,000   112,123,000
Non-accrual loans 0   0
Non-accrual loans with no allowance 0   0
Residential loans | Other residential | Total past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 0   93,000
Residential loans | Other residential | 30-59 days past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 0   93,000
Residential loans | Other residential | 60-89 days past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 0   0
Residential loans | Other residential | 90 days or more past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 0   0
Residential loans | Other residential | Current | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 116,447,000   112,030,000
Consumer loans | Installment and other consumer loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 60,468,000   56,989,000
Consumer loans | Installment and other consumer loans | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 60,468,000   56,989,000
Non-accrual loans 3,000   91,000
Non-accrual loans with no allowance 0   91,000
Consumer loans | Installment and other consumer loans | Total past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 4,000   5,000
Consumer loans | Installment and other consumer loans | 30-59 days past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 1,000   5,000
Consumer loans | Installment and other consumer loans | 60-89 days past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 0   0
Consumer loans | Installment and other consumer loans | 90 days or more past due | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost 3,000   0
Consumer loans | Installment and other consumer loans | Current | Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, at amortized cost $ 60,464,000   $ 56,984,000