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Loans and Allowance for Loan Losses, Activity In Period (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2017
Period
Jun. 30, 2017
USD ($)
Period
Dec. 31, 2017
USD ($)
qtr
Dec. 31, 2016
USD ($)
qtr
Dec. 31, 2015
USD ($)
Allowance for loan losses by segment [Roll Forward]          
Beginning Balance   $ 8,245 $ 8,245 $ 7,738  
Charges-offs     (3,287) (1,770)  
Recoveries     330 347  
Provision for loan losses     4,160 1,930 $ 1,025
Ending balance     9,448 8,245 7,738
Ending balances individually evaluated for impairment     95 800  
Ending balances collectively evaluated for impairment     9,353 7,445  
Loan Balances [Abstract]          
Ending balance individually evaluated for impairment     18,475 20,056  
Ending balance collectively evaluated for impairment     720,065 583,826  
Ending balance     $ 738,540 $ 603,882  
Changes in Accounting Methodology [Abstract]          
Number of migration periods | Period 8 4      
Number of quarters remains on each migration period | qtr     12 12  
Decrease in allowance for loan losses compared to prior methodology, change in migration periods     $ 1,200    
Calculated provision based on current methodology     4,160    
Calculated provision based on prior methodology     5,318    
Difference     (1,158)    
Commercial [Member]          
Allowance for loan losses by segment [Roll Forward]          
Beginning Balance   $ 1,493 1,493 $ 633  
Charges-offs     (807) (915)  
Recoveries     37 79  
Provision for loan losses     1,166 1,696  
Ending balance     1,889 1,493 633
Ending balances individually evaluated for impairment     0 271  
Ending balances collectively evaluated for impairment     1,889 1,222  
Loan Balances [Abstract]          
Ending balance individually evaluated for impairment     836 989  
Ending balance collectively evaluated for impairment     59,562 53,445  
Ending balance     60,398 54,434  
Changes in Accounting Methodology [Abstract]          
Calculated provision based on current methodology     1,166    
Calculated provision based on prior methodology     1,653    
Difference     (487)    
Real Estate [Member]          
Loan Balances [Abstract]          
Ending balance     492,720 471,524  
Real Estate [Member] | Construction [Member]          
Allowance for loan losses by segment [Roll Forward]          
Beginning Balance   846 846 985  
Charges-offs     0 0  
Recoveries     104 3  
Provision for loan losses     (409) (142)  
Ending balance     541 846 985
Ending balances individually evaluated for impairment     18 22  
Ending balances collectively evaluated for impairment     523 824  
Loan Balances [Abstract]          
Ending balance individually evaluated for impairment     813 624  
Ending balance collectively evaluated for impairment     26,676 22,492  
Ending balance     27,489 23,116  
Changes in Accounting Methodology [Abstract]          
Calculated provision based on current methodology     (409)    
Calculated provision based on prior methodology     (791)    
Difference     382    
Real Estate [Member] | Mortgage [Member]          
Allowance for loan losses by segment [Roll Forward]          
Beginning Balance   5,267 5,267 5,628  
Charges-offs     (1,934) (504)  
Recoveries     45 197  
Provision for loan losses     1,839 (54)  
Ending balance     5,217 5,267 5,628
Ending balances individually evaluated for impairment     77 507  
Ending balances collectively evaluated for impairment     5,140 4,760  
Loan Balances [Abstract]          
Ending balance individually evaluated for impairment     16,826 18,362  
Ending balance collectively evaluated for impairment     448,405 430,046  
Ending balance     465,231 448,408  
Changes in Accounting Methodology [Abstract]          
Calculated provision based on current methodology     1,839    
Calculated provision based on prior methodology     2,397    
Difference     (558)    
Consumer [Member]          
Allowance for loan losses by segment [Roll Forward]          
Beginning Balance   455 455 279  
Charges-offs     (279) (204)  
Recoveries     56 28  
Provision for loan losses     1,412 352  
Ending balance     1,644 455 279
Ending balances individually evaluated for impairment     0 0  
Ending balances collectively evaluated for impairment     1,644 455  
Loan Balances [Abstract]          
Ending balance individually evaluated for impairment     0 81  
Ending balance collectively evaluated for impairment     174,225 58,826  
Ending balance     174,225 58,907  
Changes in Accounting Methodology [Abstract]          
Calculated provision based on current methodology     1,412    
Calculated provision based on prior methodology     1,698    
Difference     (286)    
Other [Member]          
Allowance for loan losses by segment [Roll Forward]          
Beginning Balance   $ 184 184 213  
Charges-offs     (267) (147)  
Recoveries     88 40  
Provision for loan losses     152 78  
Ending balance     157 184 $ 213
Ending balances individually evaluated for impairment     0 0  
Ending balances collectively evaluated for impairment     157 184  
Loan Balances [Abstract]          
Ending balance individually evaluated for impairment     0 0  
Ending balance collectively evaluated for impairment     11,197 19,017  
Ending balance [1]     11,197 $ 19,017  
Changes in Accounting Methodology [Abstract]          
Calculated provision based on current methodology     152    
Calculated provision based on prior methodology     361    
Difference     $ (209)    
[1] Overdrawn deposit accounts are reclassified as loans and included in the Other category in the table above. Overdrawn deposit accounts totaled $594 thousand and $536 thousand at December 31, 2017 and December 31, 2016, respectively.