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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance [1]   $ 22,874   $ 22,874    
Impact of CECL adoption     $ 5,450 (1,449) $ 4,594 $ 900
Provision (reversal) - CECL method $ 856     1,449 (4,594) (900)
Initial allowance for PCD loans       1,505    
(Charge-offs) (1)     (5)    
Recoveries 14     98    
Ending balance 22,874 [1] $ 22,113   23,023 [1] 22,874 [1]  
Beginning balance 22,113   16,677   16,677 15,821
(Charge-offs)     (30)     (78)
Recoveries     16     34
Ending balance     $ 22,113     $ 16,677
Accounting Standards Update [Extensible List]   Accounting Standards Update 2016-13 Accounting Standards Update 2016-13     Accounting Standards Update 2016-13
Cumulative Effect, Period of Adoption, Adjustment            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 1,604          
Ending balance     $ 1,604      
Commercial | Commercial and industrial            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance   $ 2,530   2,530    
Impact of CECL adoption     208     $ (49)
Provision (reversal) - CECL method (269)     1,240    
Initial allowance for PCD loans       405    
(Charge-offs) 0     0    
Recoveries 14     14    
Ending balance 2,530 2,525   1,709 2,530  
Beginning balance 2,525   2,334   2,334 2,436
(Charge-offs)     (30)     (75)
Recoveries     13     22
Ending balance     2,525     2,334
Commercial | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance (278)          
Ending balance     (278)      
Commercial real estate | Commercial real estate, owner-occupied            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance   2,778   2,778    
Impact of CECL adoption     673     55
Provision (reversal) - CECL method 495     561    
Initial allowance for PCD loans       559    
(Charge-offs) 0     0    
Recoveries 0     0    
Ending balance 2,778 3,135   2,776 2,778  
Beginning balance 3,135   2,462   2,462 2,407
(Charge-offs)     0     0
Recoveries     0     0
Ending balance     3,135     2,462
Commercial real estate | Commercial real estate, owner-occupied | Cumulative Effect, Period of Adoption, Adjustment            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 138          
Ending balance     138      
Commercial real estate | Commercial real estate, investor-owned            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance   12,682   12,682    
Impact of CECL adoption     3,141     768
Provision (reversal) - CECL method 697     476    
Initial allowance for PCD loans       533    
(Charge-offs) 0     0    
Recoveries 0     0    
Ending balance 12,682 11,624   12,739 12,682  
Beginning balance 11,624   8,483   8,483 7,703
(Charge-offs)     0     0
Recoveries     0     12
Ending balance     11,624     8,483
Commercial real estate | Commercial real estate, investor-owned | Cumulative Effect, Period of Adoption, Adjustment            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 1,755          
Ending balance     1,755      
Commercial real estate | Construction            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance   1,557   1,557    
Impact of CECL adoption     219     (118)
Provision (reversal) - CECL method (496)     (62)    
Initial allowance for PCD loans       0    
(Charge-offs) 0     0    
Recoveries 0     34    
Ending balance 1,557 860   1,653 1,557  
Beginning balance 860   638   638 756
(Charge-offs)     0     0
Recoveries     3     0
Ending balance     860     638
Commercial real estate | Construction | Cumulative Effect, Period of Adoption, Adjustment            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 201          
Ending balance     201      
Residential loans | Home equity            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance   738   738    
Impact of CECL adoption     188     (65)
Provision (reversal) - CECL method (61)     193    
Initial allowance for PCD loans       0    
(Charge-offs) 0     0    
Recoveries 0     50    
Ending balance 738 1,038   595 738  
Beginning balance 1,038   850   850 915
(Charge-offs)     0     0
Recoveries     0     0
Ending balance     1,038     850
Residential loans | Home equity | Cumulative Effect, Period of Adoption, Adjustment            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance (361)          
Ending balance     (361)      
Residential loans | Other residential            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance   998   998    
Impact of CECL adoption     287     173
Provision (reversal) - CECL method 50     360    
Initial allowance for PCD loans       6    
(Charge-offs) 0     0    
Recoveries 0     0    
Ending balance 998 1,260   644 998  
Beginning balance 1,260   973   973 800
(Charge-offs)     0     0
Recoveries     0     0
Ending balance     1,260     973
Residential loans | Other residential | Cumulative Effect, Period of Adoption, Adjustment            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance (212)          
Ending balance     (212)      
Consumer loans | Installment and other consumer            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance   291   291    
Impact of CECL adoption     122     (23)
Provision (reversal) - CECL method (11)     (333)    
Initial allowance for PCD loans       2    
(Charge-offs) (1)     (5)    
Recoveries 0     0    
Ending balance 291 406   621 291  
Beginning balance 406   284   284 310
(Charge-offs)     0     (3)
Recoveries     0     0
Ending balance     406     284
Consumer loans | Installment and other consumer | Cumulative Effect, Period of Adoption, Adjustment            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance (125)          
Ending balance     (125)      
Unallocated            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance   $ 1,300   1,300    
Impact of CECL adoption     612     159
Provision (reversal) - CECL method 451     (986)    
Initial allowance for PCD loans       0    
(Charge-offs) 0     0    
Recoveries 0     0    
Ending balance 1,300     $ 2,286 1,300  
Beginning balance 1,265   653   $ 653 494
(Charge-offs)     0     0
Recoveries     0     0
Ending balance     1,265     $ 653
Unallocated | Cumulative Effect, Period of Adoption, Adjustment            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance $ 486          
Ending balance     $ 486      
[1] Refer to Note 1, Summary of Accounting Policies, for information on the adoption of ASU 2016-13 in 2020.