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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
quarter
component
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
quarter
component
Jun. 30, 2019
USD ($)
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 20   20    
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance $ 10,546 $ 9,118 $ 9,130 $ 9,104  
Provision charged to operations 3,000 300 4,375 275  
Losses charged to allowance (80) (56) (123) (65)  
Recoveries 471 43 555 91  
Allowance for credit losses, ending balance 13,937 9,405 13,937 9,405  
Ending balance: individually evaluated for impairment 294   294   $ 40
Ending balance: collectively evaluated for impairment 13,643   13,643   9,090
Commercial          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 1,657 1,450 1,428 1,671  
Provision charged to operations 7 372 233 120  
Losses charged to allowance 0 (50) (29) (50)  
Recoveries 423 28 455 59  
Allowance for credit losses, ending balance 2,087 1,800 2,087 1,800  
Ending balance: individually evaluated for impairment 255   255   2
Ending balance: collectively evaluated for impairment 1,832   1,832   1,426
Real Estate          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 7,555 6,709 6,769 6,539  
Provision charged to operations 2,834 (156) 3,620 14  
Losses charged to allowance 0 0 0 0  
Recoveries 0 0 0 0  
Allowance for credit losses, ending balance 10,389 6,553 10,389 6,553  
Ending balance: individually evaluated for impairment 25   25   3
Ending balance: collectively evaluated for impairment 10,364   10,364   6,766
Consumer          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 1,236 895 897 826  
Provision charged to operations 76 7 377 68  
Losses charged to allowance (80) (6) (94) (15)  
Recoveries 48 15 100 32  
Allowance for credit losses, ending balance 1,280 911 1,280 911  
Ending balance: individually evaluated for impairment 14   14   35
Ending balance: collectively evaluated for impairment 1,266   1,266   862
Unallocated          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 98 64 36 68  
Provision charged to operations 83 77 145 73  
Losses charged to allowance 0 0 0 0  
Recoveries 0 0 0 0  
Allowance for credit losses, ending balance 181 $ 141 181 $ 141  
Ending balance: individually evaluated for impairment 0   0   0
Ending balance: collectively evaluated for impairment $ 181   $ 181   $ 36