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Loans - Past-due Status of Loans by Class (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due $ 12,658 $ 8,287  
Current 1,058,868 980,351  
Loans 1,071,526 988,638 $ 917,564
90 Plus Days And Accruing 777 136  
Commercial | Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 3,476 884  
Current 299,030 268,578  
Loans 302,506 269,462 242,311
90 Plus Days And Accruing 753 0  
Commercial | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 273  
Current 25,406 24,608  
Loans 25,406 24,881 30,932
90 Plus Days And Accruing 0 0  
Commercial | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 1,031 328  
Current 149,738 128,013  
Loans 150,769 128,341 104,531
90 Plus Days And Accruing 20 25  
Municipal      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 0  
Current 27,056 19,751  
Loans 27,056 19,751 20,424
90 Plus Days And Accruing 0 0  
Residential | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 368  
Current 18,303 8,083  
Loans 18,303 8,451 12,160
90 Plus Days And Accruing 0 0  
Residential | Term      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 6,403 5,187  
Current 405,066 397,843  
Loans 411,469 403,030 384,032
90 Plus Days And Accruing 0 100  
Home Equity LIne of Credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 1,564 1,108  
Current 109,343 109,094  
Loans 110,907 110,202 103,521
90 Plus Days And Accruing 0 0  
Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 184 139  
Current 24,926 24,381  
Loans 25,110 24,520 $ 19,653
90 Plus Days And Accruing 4 11  
30-59 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 2,711 2,122  
30-59 Days Past Due | Commercial | Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 1,039 603  
30-59 Days Past Due | Commercial | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 35  
30-59 Days Past Due | Commercial | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 202 303  
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 0 368  
30-59 Days Past Due | Residential | Term      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 631 450  
30-59 Days Past Due | Home Equity LIne of Credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 704 261  
30-59 Days Past Due | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 135 102  
60-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 4,227 2,379  
60-89 Days Past Due | Commercial | Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 22 0  
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 33 0  
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 0 0  
60-89 Days Past Due | Residential | Term      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 3,970 2,098  
60-89 Days Past Due | Home Equity LIne of Credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 157 255  
60-89 Days Past Due | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 45 26  
90 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 5,720 3,786  
90 Days Past Due | Commercial | Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 2,415 281  
90 Days Past Due | Commercial | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 238  
90 Days Past Due | Commercial | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 796 25  
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 1,802 2,639  
90 Days Past Due | Home Equity LIne of Credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 703 592  
90 Days Past Due | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due $ 4 $ 11