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Loans - Past-due Status of Loans by Class (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due $ 18,676 $ 12,658  
Current 1,145,463 1,058,868  
Loans 1,164,139 1,071,526 $ 988,638
90 Plus Days And Accruing 445 777  
Commercial | Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 874 3,476  
Current 322,935 299,030  
Loans 323,809 302,506 269,462
90 Plus Days And Accruing 0 753  
Commercial | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 0  
Current 38,056 25,406  
Loans 38,056 25,406 24,881
90 Plus Days And Accruing 0 0  
Commercial | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 7,779 1,031  
Current 173,749 149,738  
Loans 181,528 150,769 128,341
90 Plus Days And Accruing 0 20  
Municipal      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 0  
Current 33,391 27,056  
Loans 33,391 27,056 19,751
90 Plus Days And Accruing 0 0  
Residential | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 471 0  
Current 17,397 18,303  
Loans 17,868 18,303 8,451
90 Plus Days And Accruing 0 0  
Residential | Term      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 7,659 6,403  
Current 425,002 405,066  
Loans 432,661 411,469 403,030
90 Plus Days And Accruing 436 0  
Home Equity LIne of Credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 1,707 1,564  
Current 109,595 109,343  
Loans 111,302 110,907 110,202
90 Plus Days And Accruing 0 0  
Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 186 184  
Current 25,338 24,926  
Loans 25,524 25,110 $ 24,520
90 Plus Days And Accruing 9 4  
30-59 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 2,944 2,711  
30-59 Days Past Due | Commercial | Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 574 1,039  
30-59 Days Past Due | Commercial | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 0  
30-59 Days Past Due | Commercial | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 542 202  
30-59 Days Past Due | Municipal      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 0  
30-59 Days Past Due | Residential | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 101 0  
30-59 Days Past Due | Residential | Term      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 1,031 631  
30-59 Days Past Due | Home Equity LIne of Credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 537 704  
30-59 Days Past Due | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 159 135  
60-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 11,948 4,227  
60-89 Days Past Due | Commercial | Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 80 22  
60-89 Days Past Due | Commercial | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 0  
60-89 Days Past Due | Commercial | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 6,663 33  
60-89 Days Past Due | Municipal      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 0  
60-89 Days Past Due | Residential | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 370 0  
60-89 Days Past Due | Residential | Term      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 4,372 3,970  
60-89 Days Past Due | Home Equity LIne of Credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 445 157  
60-89 Days Past Due | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 18 45  
90 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 3,784 5,720  
90 Days Past Due | Commercial | Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 220 2,415  
90 Days Past Due | Commercial | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 0  
90 Days Past Due | Commercial | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 574 796  
90 Days Past Due | Municipal      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 0  
90 Days Past Due | Residential | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 0  
90 Days Past Due | Residential | Term      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 2,256 1,802  
90 Days Past Due | Home Equity LIne of Credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 725 703  
90 Days Past Due | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due $ 9 $ 4