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Allowance for Loan Losses and Reserve for Unfunded Lending Commitments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Sep. 30, 2018
Dec. 31, 2017
Allowance for Loan Losses              
Balance, beginning of period     $ 13,603 [1] $ 12,801 $ 12,801    
Provision for loan losses $ (23) $ 440 (97) 1,090 1,016    
Charge-offs     (202) (411) (690)    
Recoveries     284 378 476    
Balance, end of period 13,588 13,858 13,588 13,858 13,603 [1]    
Reserve for Unfunded Lending Commitments              
Balance, beginning of period     206 203 203    
Provision for unfunded commitments     12 11 3    
Charge-offs     0 0 0    
Balance, end of period 218 214 218 214 206    
Allowance for Loan Losses              
Individually evaluated for impairment           $ 800 $ 167
Collectively evaluated for impairment           12,601 13,151
Total 13,588 $ 13,858 13,603 [1] 12,801 12,801 13,588 13,603 [1]
Loans              
Individually evaluated for impairment           2,415 3,217
Collectively evaluated for impairment           1,307,517 1,309,478
Total Loans           1,331,153 1,336,125 [1]
Acquired impaired loans              
Allowance for Loan Losses              
Balance, beginning of period     285        
Balance, end of period 187   187   285    
Allowance for Loan Losses              
Total 187   285   285 187 285
Loans              
Total Loans           21,221 23,430
Commercial              
Allowance for Loan Losses              
Balance, beginning of period     2,413 2,095 2,095    
Provision for loan losses     818   377    
Charge-offs     (10)   (282)    
Recoveries     65   223    
Balance, end of period 3,286   3,286   2,413    
Allowance for Loan Losses              
Individually evaluated for impairment           791 154
Collectively evaluated for impairment           2,495 2,259
Total 3,286   2,413 2,095 2,095 3,286 2,413
Loans              
Individually evaluated for impairment           1,034 206
Collectively evaluated for impairment           282,783 251,185
Total Loans           284,176 251,666
Commercial | Acquired impaired loans              
Allowance for Loan Losses              
Balance, beginning of period     0        
Balance, end of period 0   0   0    
Allowance for Loan Losses              
Total 0   0   0 0 0
Loans              
Total Loans           359 275
Commercial Real Estate              
Allowance for Loan Losses              
Balance, beginning of period     8,321 7,355 7,355    
Provision for loan losses     (1,127)   999    
Charge-offs     (11)   (93)    
Recoveries     4   60    
Balance, end of period 7,187   7,187   8,321    
Allowance for Loan Losses              
Individually evaluated for impairment           0 0
Collectively evaluated for impairment           7,151 8,203
Total 7,187   8,321 7,355 7,355 7,187 8,321
Loans              
Individually evaluated for impairment           496 862
Collectively evaluated for impairment           720,540 747,819
Total Loans           731,568 760,848
Commercial Real Estate | Acquired impaired loans              
Allowance for Loan Losses              
Balance, beginning of period     118        
Balance, end of period 36   36   118    
Allowance for Loan Losses              
Total 36   118   118 36 118
Loans              
Total Loans           10,532 12,167
Residential Real Estate              
Allowance for Loan Losses              
Balance, beginning of period     2,825 3,303 3,303    
Provision for loan losses     186   (391)    
Charge-offs     (86)   (172)    
Recoveries     139   85    
Balance, end of period 3,064   3,064   2,825    
Allowance for Loan Losses              
Individually evaluated for impairment           9 13
Collectively evaluated for impairment           2,904 2,645
Total 3,064   2,825 3,303 3,303 3,064 2,825
Loans              
Individually evaluated for impairment           885 2,144
Collectively evaluated for impairment           298,950 306,066
Total Loans           310,150 319,183
Residential Real Estate | Acquired impaired loans              
Allowance for Loan Losses              
Balance, beginning of period     167        
Balance, end of period 151   151   167    
Allowance for Loan Losses              
Total 151   167   167 151 167
Loans              
Total Loans           10,315 10,973
Consumer              
Allowance for Loan Losses              
Balance, beginning of period     44 48 48    
Provision for loan losses     26   31    
Charge-offs     (95)   (143)    
Recoveries     76   108    
Balance, end of period 51   51   44    
Allowance for Loan Losses              
Individually evaluated for impairment           0 0
Collectively evaluated for impairment           51 44
Total 51   44 $ 48 48 51 44
Loans              
Individually evaluated for impairment           0 5
Collectively evaluated for impairment           5,244 4,408
Total Loans           5,259 4,428
Consumer | Acquired impaired loans              
Allowance for Loan Losses              
Balance, beginning of period     0        
Balance, end of period 0   0   0    
Allowance for Loan Losses              
Total $ 0   $ 0   $ 0 0 0
Loans              
Total Loans           $ 15 $ 15
[1] Derived from audited consolidated financial statements.