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Allowance for Loan Losses (the "Allowance") - Allowance allocated by portfolio segment (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Impaired Loans            
Allowance on loans and leases individually evaluated for impairment $ 126   $ 103      
Allowance on loans and leases collectively evaluated for impairment 9,186   7,950      
Total 9,312 $ 8,625 8,053 $ 7,711 $ 7,449 $ 6,709
Carrying value of loans and leases individually evaluated for impairment 5,965   5,799      
Carrying value of loans and leases collectively evaluated for impairment 920,509   822,566      
Total 926,474   828,365      
Commercial mortgage            
Impaired Loans            
Allowance on loans and leases collectively evaluated for impairment 3,455   3,209      
Total 3,455 3,197 3,209 3,153 3,011 2,434
Carrying value of loans and leases individually evaluated for impairment 2,204   1,929      
Carrying value of loans and leases collectively evaluated for impairment 355,214   323,464      
Total 357,418   325,393      
Home equity lines and loans            
Impaired Loans            
Allowance on loans and leases individually evaluated for impairment 2          
Allowance on loans and leases collectively evaluated for impairment 326   323      
Total 328 354 323 316 269 280
Carrying value of loans and leases individually evaluated for impairment 255   83      
Carrying value of loans and leases collectively evaluated for impairment 83,157   82,203      
Total 83,412   82,286      
Residential mortgage            
Impaired Loans            
Allowance on loans and leases collectively evaluated for impairment 172   191      
Total 172 200 191 180 166 82
Carrying value of loans and leases individually evaluated for impairment 855   969      
Carrying value of loans and leases collectively evaluated for impairment 44,138   40,969      
Total 44,993   41,938      
Construction            
Impaired Loans            
Allowance on loans and leases collectively evaluated for impairment 2,169   1,627      
Total 2,169 2,033 1,627 1,497 1,438 1,689
Carrying value of loans and leases individually evaluated for impairment 1,262   1,281      
Carrying value of loans and leases collectively evaluated for impairment 153,201   115,625      
Total 154,463   116,906      
Commercial and industrial            
Impaired Loans            
Allowance on loans and leases individually evaluated for impairment 124   103      
Allowance on loans and leases collectively evaluated for impairment 3,051   2,587      
Total 3,175 2,830 2,690 2,558 2,559 2,214
Carrying value of loans and leases individually evaluated for impairment 1,389   1,537      
Carrying value of loans and leases collectively evaluated for impairment 282,987   258,269      
Total 284,376   259,806      
Consumer            
Impaired Loans            
Allowance on loans and leases collectively evaluated for impairment 6   3      
Total 6 4 3 4 3 5
Carrying value of loans and leases collectively evaluated for impairment 984   701      
Total 984   701      
Leases, net            
Impaired Loans            
Allowance on loans and leases collectively evaluated for impairment 7   10      
Total 7 $ 7 10 $ 3 $ 3 $ 5
Carrying value of loans and leases collectively evaluated for impairment 828   1,335      
Total $ 828   $ 1,335