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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, 2019
USD ($)
component
quarter
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
component
quarter
Jun. 30, 2018
USD ($)
Dec. 31, 2018
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 $ 9,118 $ 8,788 $ 9,104 $ 8,778  
Provision charged to operations 300 50 275 50  
Losses charged to allowance (56) (59) (65) (151)  
Recoveries 43 141 91 243  
Allowance for credit losses, ending balance 9,405 8,920 9,405 8,920  
Ending balance: individually evaluated for impairment 84   84   $ 90
Ending balance: collectively evaluated for impairment 9,321   9,321   9,014
Commercial          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 1,450 1,736 1,671 2,071  
Provision charged to operations 372 206 120 (150)  
Losses charged to allowance (50) (36) (50) (86)  
Recoveries 28 32 59 103  
Allowance for credit losses, ending balance 1,800 1,938 1,800 1,938  
Ending balance: individually evaluated for impairment 6   6   9
Ending balance: collectively evaluated for impairment 1,794   1,794   1,662
Real Estate          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 6,709 6,131 6,539 5,795  
Provision charged to operations (156) (53) 14 278  
Losses charged to allowance 0 0 0 0  
Recoveries 0 77 0 82  
Allowance for credit losses, ending balance 6,553 6,155 6,553 6,155  
Ending balance: individually evaluated for impairment 18   18   27
Ending balance: collectively evaluated for impairment 6,535   6,535   6,512
Consumer          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 895 812 826 825  
Provision charged to operations 7 (28) 68 (25)  
Losses charged to allowance (6) (23) (15) (65)  
Recoveries 15 32 32 58  
Allowance for credit losses, ending balance 911 793 911 793  
Ending balance: individually evaluated for impairment 60   60   54
Ending balance: collectively evaluated for impairment 851   851   772
Unallocated          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 64 109 68 87  
Provision charged to operations 77 (75) 73 (53)  
Losses charged to allowance 0 0 0 0  
Recoveries 0 0 0 0  
Allowance for credit losses, ending balance 141 $ 34 141 $ 34  
Ending balance: individually evaluated for impairment 0   0   0
Ending balance: collectively evaluated for impairment $ 141   $ 141   $ 68