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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, 2020
Dec. 31, 2019
Oct. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201613Member  
Allowance for Credit Losses $ 22,874 $ 22,113 $ 16,677  
Allowance for credit losses on unfunded commitments   1,697    
Unallocated        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Allowance for Credit Losses   1,265    
Commercial | Commercial and industrial        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Allowance for Credit Losses 2,530 2,525    
Commercial real estate | Commercial real estate, owner-occupied        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Allowance for Credit Losses 2,778 3,135    
Commercial real estate | Commercial real estate, investor-owned        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Allowance for Credit Losses 12,682 11,624    
Commercial real estate | Construction        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Allowance for Credit Losses 1,557 860    
Residential loans | Home equity        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Allowance for Credit Losses 738 1,038    
Residential loans | Other residential        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Allowance for Credit Losses 998 1,260    
Consumer loans | Installment and other consumer        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Allowance for Credit Losses 291 406    
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   1,604    
Cumulative Effect, Period of Adoption, Adjustment | Commercial | Commercial and industrial        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Allowance for Credit Losses   (278)    
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   138    
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   1,755    
Cumulative Effect, Period of Adoption, Adjustment | Commercial real estate | Construction        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Allowance for Credit Losses   201    
Cumulative Effect, Period of Adoption, Adjustment | Residential loans | Home equity        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Allowance for Credit Losses   (361)    
Cumulative Effect, Period of Adoption, Adjustment | Residential loans | Other residential        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Allowance for Credit Losses   (212)    
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   (125)    
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 $ 748      
Allowance for Credit Losses       $ 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       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       (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       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       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       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       (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       (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       (125)
Cumulative Effect, Period of Adoption, Adjusted Balance        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Allowance for Credit Losses   23,717   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       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   2,247   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   3,273   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   13,379   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   1,061   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   677   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   1,048   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   $ 281   $ 281