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Loans - Past-due Status of Loans by Class (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Schedule of Financing Receivables [Line Items]      
All Past Due $ 10,412 $ 12,658 $ 8,247
Current 1,079,323 1,058,868 996,695
Total 1,089,735 1,071,526 1,004,942
90 Days or More & Accruing 11 777 452
30-59 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 4,636 2,711 3,966
60-89 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 1,127 4,227 696
90 Days or More Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 4,649 5,720 3,585
Commercial | Real estate      
Schedule of Financing Receivables [Line Items]      
All Past Due 2,737 3,476 1,255
Current 301,926 299,030 278,428
Total 304,663 302,506 279,683
90 Days or More & Accruing 0 753 0
Commercial | Real estate | 30-59 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 142 1,039 428
Commercial | Real estate | 60-89 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 772 22 376
Commercial | Real estate | 90 Days or More Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 1,823 2,415 451
Commercial | Construction      
Schedule of Financing Receivables [Line Items]      
All Past Due 20 0 150
Current 28,755 25,406 19,988
Total 28,775 25,406 20,138
90 Days or More & Accruing 0 0 0
Commercial | Construction | 30-59 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 20 0 0
Commercial | Construction | 60-89 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 0 0 0
Commercial | Construction | 90 Days or More Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 0 0 150
Commercial | Other      
Schedule of Financing Receivables [Line Items]      
All Past Due 792 1,031 433
Current 157,715 149,738 133,196
Total 158,507 150,769 133,629
90 Days or More & Accruing 0 20 0
Commercial | Other | 30-59 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 199 202 323
Commercial | Other | 60-89 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 154 33 110
Commercial | Other | 90 Days or More Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 439 796 0
Municipal      
Schedule of Financing Receivables [Line Items]      
All Past Due 0 0 0
Current 28,327 27,056 19,042
Total 28,327 27,056 19,042
90 Days or More & Accruing 0 0 0
Municipal | 30-59 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 0 0 0
Municipal | 60-89 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 0 0 0
Municipal | 90 Days or More Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 0 0 0
Residential | Construction      
Schedule of Financing Receivables [Line Items]      
All Past Due 0 0 0
Current 13,717 18,303 11,754
Total 13,717 18,303 11,754
90 Days or More & Accruing 0 0 0
Residential | Construction | 30-59 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 0 0 0
Residential | Construction | 60-89 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 0 0 0
Residential | Construction | 90 Days or More Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 0 0 0
Residential | Term      
Schedule of Financing Receivables [Line Items]      
All Past Due 5,158 6,403 4,783
Current 416,044 405,066 400,712
Total 421,202 411,469 405,495
90 Days or More & Accruing 0 0 411
Residential | Term | 30-59 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 3,555 631 2,321
Residential | Term | 60-89 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 0 3,970 62
Residential | Term | 90 Days or More Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 1,603 1,802 2,400
Home equity line of credit      
Schedule of Financing Receivables [Line Items]      
All Past Due 1,332 1,564 1,383
Current 108,684 109,343 108,866
Total 110,016 110,907 110,249
90 Days or More & Accruing 0 0 0
Home equity line of credit | 30-59 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 392 704 718
Home equity line of credit | 60-89 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 167 157 122
Home equity line of credit | 90 Days or More Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 773 703 543
Consumer      
Schedule of Financing Receivables [Line Items]      
All Past Due 373 184 243
Current 24,155 24,926 24,709
Total 24,528 25,110 24,952
90 Days or More & Accruing 11 4 41
Consumer | 30-59 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 328 135 176
Consumer | 60-89 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 34 45 26
Consumer | 90 Days or More Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due $ 11 $ 4 $ 41