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Summary of Significant Accounting Policies - Schedule of CECL adoption (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2021
Oct. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Accounting Standards Update [Extensible List]   Accounting Standards Update 2016-13 Accounting Standards Update 2016-13 Accounting Standards Update 2016-13    
Allowance for credit losses on loans $ 22,874 [1] $ 22,113     $ 23,023 [1]  
Allowance for credit losses on unfunded commitments   1,697        
Unallocated            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans   1,265        
Commercial | Commercial and industrial            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans 2,530 2,525     1,709  
Commercial real estate | Commercial real estate, owner-occupied            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans 2,778 3,135     2,776  
Commercial real estate | Commercial real estate, investor-owned            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans 12,682 11,624     12,739  
Commercial real estate | Construction            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans 1,557 860     1,653  
Residential loans | Home equity            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans 738 1,038     595  
Residential loans | Other residential            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans 998 1,260     644  
Consumer loans | Installment and other consumer            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans 291 $ 406     $ 621  
Cumulative Effect, Period of Adoption, Adjustment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans 748          
Financing receivable, current expected credit loss, cumulative adjustment on retained earnings, before tax (1,604)          
Financing receivable, current expected credit loss, cumulative adjustment on retained earnings, tax 474          
Financing receivable, current expected credit loss, cumulative adjustment on retained earnings, after tax (1,130)          
Financing receivable, current expected credit loss, cumulative adjustment on net income, before tax 856          
Financing receivable, current expected credit loss, cumulative adjustment on net income, tax (253)          
Financing receivable, current expected credit loss, cumulative adjustment on net income, after tax 603          
Off-balance sheet, credit loss, liability, current expected credit loss, cumulative adjustment, before tax 1,082          
Off-balance sheet, credit loss, liability, current expected credit loss, cumulative adjustment on retained earnings, before tax (122)          
Off-balance sheet, credit loss, liability, current expected credit loss, cumulative adjustment on retained earnings, tax 36          
Off-balance sheet, credit loss, liability, current expected credit loss, cumulative adjustment on retained earnings, after tax (86)          
Off-balance sheet, credit loss, liability, current expected credit loss, cumulative adjustment on net income, before tax (960)          
Off-balance sheet, credit loss, liability, current expected credit loss, cumulative adjustment on net income, tax 284          
Off-balance sheet, credit loss, liability, current expected credit loss, cumulative adjustment on net income, after tax $ (676)          
Allowance for credit losses on loans     $ 1,604     $ 23,717
Cumulative Effect, Period of Adoption, Adjustment | Commercial | Commercial and industrial            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans     (278)     2,247
Cumulative Effect, Period of Adoption, Adjustment | Commercial real estate | Commercial real estate, owner-occupied            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans     138     3,273
Cumulative Effect, Period of Adoption, Adjustment | Commercial real estate | Commercial real estate, investor-owned            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans     1,755     13,379
Cumulative Effect, Period of Adoption, Adjustment | Commercial real estate | Construction            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans     201     1,061
Cumulative Effect, Period of Adoption, Adjustment | Residential loans | Home equity            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans     (361)     677
Cumulative Effect, Period of Adoption, Adjustment | Residential loans | Other residential            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans     (212)     1,048
Cumulative Effect, Period of Adoption, Adjustment | Consumer loans | Installment and other consumer            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans     $ (125)     281
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans           1,604
Allowance for credit losses on unfunded commitments           122
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Unallocated            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans           486
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Commercial | Commercial and industrial            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans           (278)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Commercial real estate | Commercial real estate, owner-occupied            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans           138
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Commercial real estate | Commercial real estate, investor-owned            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans           1,755
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Commercial real estate | Construction            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans           201
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Residential loans | Home equity            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans           (361)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Residential loans | Other residential            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans           (212)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Consumer loans | Installment and other consumer            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans           (125)
Cumulative Effect, Period of Adoption, Adjusted Balance            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans           23,717
Allowance for credit losses on unfunded commitments           1,819
Cumulative Effect, Period of Adoption, Adjusted Balance | Unallocated            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans           1,751
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial | Commercial and industrial            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans           2,247
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial real estate | Commercial real estate, owner-occupied            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans           3,273
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial real estate | Commercial real estate, investor-owned            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans           13,379
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial real estate | Construction            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans           1,061
Cumulative Effect, Period of Adoption, Adjusted Balance | Residential loans | Home equity            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans           677
Cumulative Effect, Period of Adoption, Adjusted Balance | Residential loans | Other residential            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans           1,048
Cumulative Effect, Period of Adoption, Adjusted Balance | Consumer loans | Installment and other consumer            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans           $ 281
[1] Refer to Note 1, Summary of Accounting Policies, for information on the adoption of ASU 2016-13 in 2020.