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Loans and Allowance for Credit Losses - Outstanding and Aging Analysis (Details)
 3 Months Ended
Mar. 31, 2021
USD ($)
loan
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total $ 2,121,772,000   $ 2,088,556,000
Non-accrual loans with no allowance 9,205,000   9,233,000
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, number of loans placed on nonaccrual status | loan 0    
Financing receivable, accrued interest, writeoff $ 13,000    
Commercial loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 545,069,000   498,408,000
Non-accrual loans with no allowance 0   0
Commercial real estate loans | Commercial owner-occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 308,266,000   304,963,000
Non-accrual loans with no allowance 7,147,000   7,147,000
Commercial real estate loans | Commercial investor-owned      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 955,021,000   961,208,000
Non-accrual loans with no allowance 1,603,000   1,610,000
Commercial real estate loans | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 71,066,000   73,046,000
Non-accrual loans with no allowance 0   0
Residential loans | Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 96,575,000   104,813,000
Non-accrual loans with no allowance 455,000   459,000
Residential loans | Other residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 124,383,000   123,395,000
Non-accrual loans with no allowance 0   0
Consumer loans | Installment and other consumer loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 21,392,000   22,723,000
Non-accrual loans with no allowance 0   17,000
Financial asset, other than financial asset acquired with credit deterioration      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 2,021,000   2,705,000
Current 2,119,751,000   2,085,851,000
Total 2,121,772,000   2,088,556,000
Non-accrual 9,205,000    
Financial asset, other than financial asset acquired with credit deterioration | 30-59 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 1,047,000   2,083,000
Non-accrual 9,233,000    
Financial asset, other than financial asset acquired with credit deterioration | 60-89 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 96,000   622,000
Financial asset, other than financial asset acquired with credit deterioration | 90 days or more past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 878,000   0
Financial asset, other than financial asset acquired with credit deterioration | Commercial loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   0
Current 545,069,000   498,408,000
Total 545,069,000   498,408,000
Non-accrual 0    
Financial asset, other than financial asset acquired with credit deterioration | Commercial loans | Commercial and industrial | 30-59 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   0
Non-accrual 0    
Financial asset, other than financial asset acquired with credit deterioration | Commercial loans | Commercial and industrial | 60-89 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   0
Financial asset, other than financial asset acquired with credit deterioration | Commercial loans | Commercial and industrial | 90 days or more past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial owner-occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   0
Current 308,266,000   304,963,000
Total 308,266,000   304,963,000
Non-accrual 7,147,000    
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial owner-occupied | 30-59 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   0
Non-accrual 7,147,000    
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial owner-occupied | 60-89 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial owner-occupied | 90 days or more past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial investor-owned      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 1,669,000   1,673,000
Current 953,352,000   959,535,000
Total 955,021,000   961,208,000
Non-accrual 1,603,000    
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial investor-owned | 30-59 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 791,000   1,673,000
Non-accrual 1,610,000    
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial investor-owned | 60-89 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial investor-owned | 90 days or more past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 878,000   0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   0
Current 71,066,000   73,046,000
Total 71,066,000   73,046,000
Non-accrual 0    
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Construction | 30-59 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   0
Non-accrual 0    
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Construction | 60-89 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Construction | 90 days or more past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   0
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 216,000   274,000
Current 96,359,000   104,539,000
Total 96,575,000   104,813,000
Non-accrual 455,000    
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Home equity | 30-59 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 120,000   274,000
Non-accrual 459,000    
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Home equity | 60-89 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 96,000   0
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Home equity | 90 days or more past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   0
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Other residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   0
Current 124,383,000   123,395,000
Total 124,383,000   123,395,000
Non-accrual 0    
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Other residential | 30-59 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   0
Non-accrual 0    
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Other residential | 60-89 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   0
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Other residential | 90 days or more past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   0
Financial asset, other than financial asset acquired with credit deterioration | Consumer loans | Installment and other consumer loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 136,000   758,000
Current 21,256,000   21,965,000
Total 21,392,000   22,723,000
Non-accrual 0    
Financial asset, other than financial asset acquired with credit deterioration | Consumer loans | Installment and other consumer loans | 30-59 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 136,000   136,000
Non-accrual 17,000    
Financial asset, other than financial asset acquired with credit deterioration | Consumer loans | Installment and other consumer loans | 60-89 days past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due 0   622,000
Financial asset, other than financial asset acquired with credit deterioration | Consumer loans | Installment and other consumer loans | 90 days or more past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans past due $ 0   $ 0