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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
quarter
component
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
quarter
component
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]          
Number of primary components | component 2   2    
Lookback period used in reserve analysis | quarter 51   51    
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance $ 10,439 $ 13,937 $ 12,915 $ 9,130  
Provision charged to operations (500) (600) (3,800) 4,975  
Losses charged to allowance (34) (45) (261) (169)  
Recoveries 156 165 1,207 721  
Allowance for credit losses, ending balance 10,061 14,657 10,061 14,657  
Ending balance: individually evaluated for impairment 931   931   $ 631
Ending balance: collectively evaluated for impairment 9,130   9,130   12,284
Commercial          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 2,210 2,087 2,019 1,428  
Provision charged to operations 118 30 321 (203)  
Losses charged to allowance (15) (43) (46) (72)  
Recoveries 21 146 682 601  
Allowance for credit losses, ending balance 2,334 2,160 2,334 2,160  
Ending balance: individually evaluated for impairment 877   877   339
Ending balance: collectively evaluated for impairment 1,457   1,457   1,680
Real Estate          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 7,050 10,389 9,174 6,769  
Provision charged to operations (434) (267) 2,877 (3,887)  
Losses charged to allowance 0 0 0 0  
Recoveries 0 0 319 0  
Allowance for credit losses, ending balance 6,616 10,656 6,616 10,656  
Ending balance: individually evaluated for impairment 50   50   271
Ending balance: collectively evaluated for impairment 6,566   6,566   8,903
Consumer          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 828 1,280 1,091 897  
Provision charged to operations (230) (60) 368 (437)  
Losses charged to allowance (19) (2) (215) (97)  
Recoveries 135 19 206 120  
Allowance for credit losses, ending balance 714 1,357 714 1,357  
Ending balance: individually evaluated for impairment 4   4   21
Ending balance: collectively evaluated for impairment 710   710   1,070
Unallocated          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 351 181 631 36  
Provision charged to operations 46 (303) 234 (448)  
Losses charged to allowance 0 0 0 0  
Recoveries 0 0 0 0  
Allowance for credit losses, ending balance 397 $ 484 397 $ 484  
Ending balance: individually evaluated for impairment 0   0   0
Ending balance: collectively evaluated for impairment $ 397   $ 397   $ 631