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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, 2020
USD ($)
quarter
component
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
quarter
component
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]          
Number of primary components | component 2   2    
Lookback period used in reserve analysis | quarter 47   47    
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance $ 13,937 $ 9,405 $ 9,130 $ 9,104  
Provision charged to operations 600 250 4,975 525  
Losses charged to allowance (45) (215) (169) (280)  
Recoveries 165 55 721 146  
Allowance for credit losses, ending balance 14,657 9,495 14,657 9,495  
Ending balance: individually evaluated for impairment 739   739   $ 40
Ending balance: collectively evaluated for impairment 13,918   13,918   9,090
Commercial          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 2,087 1,800 1,428 1,671  
Provision charged to operations (30) 3 203 123  
Losses charged to allowance (43) (122) (72) (172)  
Recoveries 146 37 601 96  
Allowance for credit losses, ending balance 2,160 1,718 2,160 1,718  
Ending balance: individually evaluated for impairment 223   223   2
Ending balance: collectively evaluated for impairment 1,937   1,937   1,426
Real Estate          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 10,389 6,553 6,769 6,539  
Provision charged to operations 267 508 3,887 522  
Losses charged to allowance 0 0 0 0  
Recoveries 0 0 0 0  
Allowance for credit losses, ending balance 10,656 7,061 10,656 7,061  
Ending balance: individually evaluated for impairment 489   489   3
Ending balance: collectively evaluated for impairment 10,167   10,167   6,766
Consumer          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 1,280 911 897 826  
Provision charged to operations 60 117 437 185  
Losses charged to allowance (2) (93) (97) (108)  
Recoveries 19 18 120 50  
Allowance for credit losses, ending balance 1,357 953 1,357 953  
Ending balance: individually evaluated for impairment 27   27   35
Ending balance: collectively evaluated for impairment 1,330   1,330   862
Unallocated          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 181 141 36 68  
Provision charged to operations 303 (378) 448 (305)  
Losses charged to allowance 0 0 0 0  
Recoveries 0 0 0 0  
Allowance for credit losses, ending balance 484 $ (237) 484 $ (237)  
Ending balance: individually evaluated for impairment 0   0   0
Ending balance: collectively evaluated for impairment $ 484   $ 484   $ 36