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Loans - Past-due Status of Loans by Class (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015
--- | --- | --- | ---
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | $ 10,793 | $ 8,287 | $ 11,016
Current | 1,027,420 | 980,351 | 952,093
Total | 1,038,213 | 988,638 | 963,109
90 Days or More & Accruing | 321 | 136 | 236
Commercial real estate |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 1,626 | 884 | 2,114
Current | 301,686 | 268,578 | 247,300
Total | 303,312 | 269,462 | 249,414
90 Days or More & Accruing | 0 | 0 | 0
Commercial construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 46 | 273 | 208
Current | 18,393 | 24,608 | 39,296
Total | 18,439 | 24,881 | 39,504
90 Days or More & Accruing | 0 | 0 | 0
Commercial other |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 663 | 328 | 262
Current | 135,988 | 128,013 | 127,987
Total | 136,651 | 128,341 | 128,249
90 Days or More & Accruing | 0 | 25 | 0
Municipal |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
Current | 25,531 | 19,751 | 22,821
Total | 25,531 | 19,751 | 22,821
90 Days or More & Accruing | 0 | 0 | 0
Residential term |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 7,007 | 5,187 | 6,270
Current | 396,454 | 397,843 | 371,820
Total | 403,461 | 403,030 | 378,090
90 Days or More & Accruing | 245 | 100 | 90
Residential construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 368 | 160
Current | 13,403 | 8,083 | 14,055
Total | 13,403 | 8,451 | 14,215
90 Days or More & Accruing | 0 | 0 | 0
Home equity line of credit |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 1,153 | 1,108 | 1,609
Current | 111,383 | 109,094 | 107,179
Total | 112,536 | 110,202 | 108,788
90 Days or More & Accruing | 68 | 0 | 35
Consumer |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 298 | 139 | 393
Current | 24,582 | 24,381 | 21,635
Total | 24,880 | 24,520 | 22,028
90 Days or More & Accruing | 8 | 11 | 111
30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 2,172 | 2,122 | 3,745
30-59 Days Past Due | Commercial real estate |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 332 | 603 | 1,850
30-59 Days Past Due | Commercial construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 35 | 0
30-59 Days Past Due | Commercial other |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 131 | 303 | 124
30-59 Days Past Due | Municipal |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
30-59 Days Past Due | Residential term |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 662 | 450 | 810
30-59 Days Past Due | Residential construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 368 | 160
30-59 Days Past Due | Home equity line of credit |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 764 | 261 | 649
30-59 Days Past Due | Consumer |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 283 | 102 | 152
60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 5,514 | 2,379 | 2,566
60-89 Days Past Due | Commercial real estate |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 998 | 0 | 0
60-89 Days Past Due | Commercial construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 29 | 0 | 0
60-89 Days Past Due | Commercial other |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 218 | 0 | 0
60-89 Days Past Due | Municipal |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
60-89 Days Past Due | Residential term |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 4,235 | 2,098 | 2,314
60-89 Days Past Due | Residential construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
60-89 Days Past Due | Home equity line of credit |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 27 | 255 | 122
60-89 Days Past Due | Consumer |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 7 | 26 | 130
90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 3,107 | 3,786 | 4,705
90 Days or More Past Due | Commercial real estate |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 296 | 281 | 264
90 Days or More Past Due | Commercial construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 17 | 238 | 208
90 Days or More Past Due | Commercial other |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 314 | 25 | 138
90 Days or More Past Due | Municipal |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
90 Days or More Past Due | Residential term |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 2,110 | 2,639 | 3,146
90 Days or More Past Due | Residential construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
90 Days or More Past Due | Home equity line of credit |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 362 | 592 | 838
90 Days or More Past Due | Consumer |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | $ 8 | $ 11 | $ 111

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