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Loans and Allowance for Credit Losses on Loans - Schedule of Loans Outstanding and Aging Analysis (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, at amortized cost $ 2,086,942,000   $ 2,086,942,000   $ 2,092,546,000
Loans past due more than 90 days still accruing 0   0   0
Financing receivable, nonaccrual, earning interest on cash basis 0   0   0
Nonaccrual interest income reversal 131,000 $ 39,000 158,000 $ 47,000  
Financial asset, other than financial asset acquired with credit deterioration          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, at amortized cost 2,086,942,000   2,086,942,000   2,092,546,000
Non-accrual loans 5,672,000   5,672,000   2,432,000
Non-accrual loans with no allowance 5,672,000   5,672,000   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 7,309,000   7,309,000   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 2,215,000   2,215,000   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 1,098,000   1,098,000   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 3,996,000   3,996,000   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 2,079,633,000   2,079,633,000   2,091,204,000
Commercial loans | Commercial and industrial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, at amortized cost 174,096,000   174,096,000   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 174,096,000   174,096,000   173,547,000
Non-accrual loans 0   0   0
Non-accrual loans with no allowance 0   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 1,321,000   1,321,000   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 1,321,000   1,321,000   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   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   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 172,775,000   172,775,000   173,280,000
Commercial real estate loans | Commercial owner-occupied          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, at amortized cost 346,307,000   346,307,000   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 346,307,000   346,307,000   354,877,000
Non-accrual loans 4,281,000   4,281,000   1,563,000
Non-accrual loans with no allowance 4,281,000   4,281,000   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 3,992,000   3,992,000   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   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   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 3,992,000   3,992,000   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 342,315,000   342,315,000   354,877,000
Commercial real estate loans | Commercial non-owner occupied          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, at amortized cost 1,190,813,000   1,190,813,000   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 1,190,813,000   1,190,813,000   1,191,889,000
Non-accrual loans 901,000   901,000   0
Non-accrual loans with no allowance 901,000   901,000   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 1,698,000   1,698,000   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 797,000   797,000   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 901,000   901,000   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   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 1,189,115,000   1,189,115,000   1,191,889,000
Commercial real estate loans | Construction          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, at amortized cost 109,305,000   109,305,000   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 109,305,000   109,305,000   114,373,000
Non-accrual loans 0   0   0
Non-accrual loans with no allowance 0   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   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   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   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   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 109,305,000   109,305,000   114,373,000
Residential loans | Home equity          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, at amortized cost 83,267,000   83,267,000   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 83,267,000   83,267,000   88,748,000
Non-accrual loans 490,000   490,000   778,000
Non-accrual loans with no allowance 490,000   490,000   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 200,000   200,000   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 0   0   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 196,000   196,000   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 4,000   4,000   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 83,067,000   83,067,000   87,771,000
Residential loans | Other residential          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, at amortized cost 116,674,000   116,674,000   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 116,674,000   116,674,000   112,123,000
Non-accrual loans 0   0   0
Non-accrual loans with no allowance 0   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   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   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   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   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 116,674,000   116,674,000   112,030,000
Consumer loans | Installment and other consumer loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, at amortized cost 66,480,000   66,480,000   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 66,480,000   66,480,000   56,989,000
Non-accrual loans 0   0   91,000
Non-accrual loans with no allowance 0   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 98,000   98,000   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 97,000   97,000   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 1,000   1,000   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 0   0   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 $ 66,382,000   $ 66,382,000   $ 56,984,000