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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, 2018
USD ($)
quarter
component
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
quarter
component
Jun. 30, 2017
USD ($)
Dec. 31, 2017
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 $ 8,788 $ 9,214 $ 8,778 $ 9,326  
Provision charged to operations 50 (150) 50 (250)  
Losses charged to allowance (59) (27) (151) (210)  
Recoveries 141 260 243 431  
Allowance for credit losses, ending balance 8,920 9,297 8,920 9,297  
Ending balance: individually evaluated for impairment 211   211   $ 36
Ending balance: collectively evaluated for impairment 8,709   8,709   8,742
Commercial          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 1,736 2,021 2,071 2,180  
Provision charged to operations 206 (7) (150) (244)  
Losses charged to allowance (36) 0 (86) (44)  
Recoveries 32 182 103 304  
Allowance for credit losses, ending balance 1,938 2,196 1,938 2,196  
Ending balance: individually evaluated for impairment 2   2   1
Ending balance: collectively evaluated for impairment 1,936   1,936   2,070
Real Estate          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 6,131 6,225 5,795 6,200  
Provision charged to operations (53) (346) 278 (304)  
Losses charged to allowance 0 0 0 (22)  
Recoveries 77 52 82 57  
Allowance for credit losses, ending balance 6,155 5,931 6,155 5,931  
Ending balance: individually evaluated for impairment 166   166   1
Ending balance: collectively evaluated for impairment 5,989   5,989   5,794
Consumer          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 812 775 825 852  
Provision charged to operations (28) 19 (25) 15  
Losses charged to allowance (23) (27) (65) (144)  
Recoveries 32 26 58 70  
Allowance for credit losses, ending balance 793 793 793 793  
Ending balance: individually evaluated for impairment 43   43   34
Ending balance: collectively evaluated for impairment 750   750   791
Unallocated          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 109 193 87 94  
Provision charged to operations (75) 184 (53) 283  
Losses charged to allowance 0 0 0 0  
Recoveries 0 0 0 0  
Allowance for credit losses, ending balance 34 $ 377 34 $ 377  
Ending balance: individually evaluated for impairment 0   0   0
Ending balance: collectively evaluated for impairment $ 34   $ 34   $ 87