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Loans - Past-due Status of Loans by Class (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Schedule of Financing Receivables [Line Items]      
All Past Due $ 9,786 $ 12,658 $ 10,793
Current 1,110,879 1,058,868 1,027,420
Total 1,120,665 1,071,526 1,038,213
90 Days or More & Accruing 29 777 321
30-59 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 1,471 2,711 2,172
60-89 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 4,126 4,227 5,514
90 Days or More Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 4,189 5,720 3,107
Commercial | Real estate      
Schedule of Financing Receivables [Line Items]      
All Past Due 1,475 3,476 1,626
Current 305,015 299,030 301,686
Total 306,490 302,506 303,312
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 88 1,039 332
Commercial | Real estate | 60-89 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 0 22 998
Commercial | Real estate | 90 Days or More Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 1,387 2,415 296
Commercial | Construction      
Schedule of Financing Receivables [Line Items]      
All Past Due 0 0 46
Current 33,605 25,406 18,393
Total 33,605 25,406 18,439
90 Days or More & Accruing 0 0 0
Commercial | Construction | 30-59 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 0 0 0
Commercial | Construction | 60-89 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 0 0 29
Commercial | Construction | 90 Days or More Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 0 0 17
Commercial | Other      
Schedule of Financing Receivables [Line Items]      
All Past Due 803 1,031 663
Current 172,888 149,738 135,988
Total 173,691 150,769 136,651
90 Days or More & Accruing 0 20 0
Commercial | Other | 30-59 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 29 202 131
Commercial | Other | 60-89 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 259 33 218
Commercial | Other | 90 Days or More Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 515 796 314
Municipal      
Schedule of Financing Receivables [Line Items]      
All Past Due 0 0 0
Current 28,695 27,056 25,531
Total 28,695 27,056 25,531
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 99 0 0
Current 14,957 18,303 13,403
Total 15,056 18,303 13,403
90 Days or More & Accruing 0 0 0
Residential | Construction | 30-59 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 99 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 5,383 6,403 7,007
Current 421,788 405,066 396,454
Total 427,171 411,469 403,461
90 Days or More & Accruing 0 0 245
Residential | Term | 30-59 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 533 631 662
Residential | Term | 60-89 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 3,343 3,970 4,235
Residential | Term | 90 Days or More Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 1,507 1,802 2,110
Home equity line of credit      
Schedule of Financing Receivables [Line Items]      
All Past Due 1,597 1,564 1,153
Current 108,731 109,343 111,383
Total 110,328 110,907 112,536
90 Days or More & Accruing 0 0 68
Home equity line of credit | 30-59 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 440 704 764
Home equity line of credit | 60-89 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 406 157 27
Home equity line of credit | 90 Days or More Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 751 703 362
Consumer      
Schedule of Financing Receivables [Line Items]      
All Past Due 429 184 298
Current 25,200 24,926 24,582
Total 25,629 25,110 24,880
90 Days or More & Accruing 29 4 8
Consumer | 30-59 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 282 135 283
Consumer | 60-89 Days Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due 118 45 7
Consumer | 90 Days or More Past Due      
Schedule of Financing Receivables [Line Items]      
All Past Due $ 29 $ 4 $ 8