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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, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance $ 22,113 $ 16,677 $ 16,677    
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201613Member   us-gaap:AccountingStandardsUpdate201613Member  
Provision (reversal) - CECL method (856)        
(Charge-offs) (1)        
Recoveries 14        
Ending balance 22,874 $ 22,113 22,874 $ 16,677  
Beginning balance 22,113 16,677 16,677 15,821 $ 15,767
Provision (reversal) - incurred loss method   5,450 4,594 900 0
(Charge-offs)   (30)   (78) (5)
Recoveries   16   34 59
Ending balance   22,113   16,677 15,821
Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 1,604        
Ending balance   1,604      
Allowance for credit losses on loans 748        
Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 23,717        
Ending balance   23,717      
Commercial | Commercial and industrial          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 2,525        
Provision (reversal) - CECL method 269        
(Charge-offs) 0        
Recoveries 14        
Ending balance 2,530 2,525 2,530    
Beginning balance 2,525 2,334 2,334 2,436 3,654
Provision (reversal) - incurred loss method   208   (49) (1,232)
(Charge-offs)   (30)   (75) (3)
Recoveries   13   22 17
Ending balance   2,525   2,334 2,436
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 | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 2,247        
Ending balance   2,247      
Commercial real estate | Commercial real estate, owner-occupied          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 3,135        
Provision (reversal) - CECL method (495)        
(Charge-offs) 0        
Recoveries 0        
Ending balance 2,778 3,135 2,778    
Beginning balance 3,135 2,462 2,462 2,407 2,294
Provision (reversal) - incurred loss method   673   55 113
(Charge-offs)   0   0 0
Recoveries   0   0 0
Ending balance   3,135   2,462 2,407
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, owner-occupied | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 3,273        
Ending balance   3,273      
Commercial real estate | Commercial real estate, investor-owned          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 11,624        
Provision (reversal) - CECL method (697)        
(Charge-offs) 0        
Recoveries 0        
Ending balance 12,682 11,624 12,682    
Beginning balance 11,624 8,483 8,483 7,703 6,475
Provision (reversal) - incurred loss method   3,141   768 1,228
(Charge-offs)   0   0 0
Recoveries   0   12 0
Ending balance   11,624   8,483 7,703
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 | Commercial real estate, investor-owned | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 13,379        
Ending balance   13,379      
Commercial real estate | Construction          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 860        
Provision (reversal) - CECL method 496        
(Charge-offs) 0        
Recoveries 0        
Ending balance 1,557 860 1,557    
Beginning balance 860 638 638 756 681
Provision (reversal) - incurred loss method   219   (118) 75
(Charge-offs)   0   0 0
Recoveries   3   0 0
Ending balance   860   638 756
Commercial real estate | Construction | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 201        
Ending balance   201      
Commercial real estate | Construction | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 1,061        
Ending balance   1,061      
Residential loans | Home equity          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 1,038        
Provision (reversal) - CECL method 61        
(Charge-offs) 0        
Recoveries 0        
Ending balance 738 1,038 738    
Beginning balance 1,038 850 850 915 1,031
Provision (reversal) - incurred loss method   188   (65) (116)
(Charge-offs)   0   0 0
Recoveries   0   0 0
Ending balance   1,038   850 915
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 | Home equity | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 677        
Ending balance   677      
Residential loans | Other residential          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 1,260        
Provision (reversal) - CECL method (50)        
(Charge-offs) 0        
Recoveries 0        
Ending balance 998 1,260 998    
Beginning balance 1,260 973 973 800 536
Provision (reversal) - incurred loss method   287   173 264
(Charge-offs)   0   0 0
Recoveries   0   0 0
Ending balance   1,260   973 800
Residential loans | Other residential | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance (212)        
Ending balance   (212)      
Residential loans | Other residential | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 1,048        
Ending balance   1,048      
Consumer loans | Installment and other consumer          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 406        
Provision (reversal) - CECL method 11        
(Charge-offs) (1)        
Recoveries 0        
Ending balance 291 406 291    
Beginning balance 406 284 284 310 378
Provision (reversal) - incurred loss method   122   (23) (108)
(Charge-offs)   0   (3) (2)
Recoveries   0   0 42
Ending balance   406   284 310
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)      
Consumer loans | Installment and other consumer | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 281        
Ending balance   281      
Unallocated          
Allowance for Loan and Lease Losses [Roll Forward]          
Provision (reversal) - CECL method (451)        
(Charge-offs) 0        
Recoveries 0        
Ending balance 1,300   1,300    
Beginning balance 1,265 653 $ 653 494 718
Provision (reversal) - incurred loss method   612   159 (224)
(Charge-offs)   0   0 0
Recoveries   0   0 0
Ending balance   1,265   $ 653 $ 494
Unallocated | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 486        
Ending balance   486      
Unallocated | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance $ 1,751        
Ending balance   $ 1,751