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Loans - Past-due Status of Loans by Class (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | $ 12,274 | $ 13,375 | $ 7,438
Current | 1,236,858 | 1,224,908 | 1,217,002
Total | 1,249,132 | 1,238,283 | 1,224,440
90 Days or More & Accruing | 672 | 351 | 3
30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 4,399 | 5,958 | 2,112
60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 2,529 | 3,977 | 2,206
90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 5,346 | 3,440 | 3,120
Commercial | Real estate |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 1,068 | 2,051 | 715
Current | 358,513 | 351,192 | 349,399
Total | 359,581 | 353,243 | 350,114
90 Days or More & Accruing | 0 | 0 | 0
Commercial | Real estate | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 240 | 1,274 | 137
Commercial | Real estate | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 75
Commercial | Real estate | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 828 | 777 | 503
Commercial | Construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 15 | 10 | 0
Current | 32,770 | 27,294 | 40,308
Total | 32,785 | 27,304 | 40,308
90 Days or More & Accruing | 0 | 0 | 0
Commercial | Construction | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 15 | 0 | 0
Commercial | Construction | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 10 | 0
Commercial | Construction | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
Commercial | Other |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 2,295 | 580 | 795
Current | 203,615 | 195,811 | 183,923
Total | 205,910 | 196,391 | 184,718
90 Days or More & Accruing | 0 | 0 | 0
Commercial | Other | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 2,031 | 455 | 459
Commercial | Other | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 5 | 42
Commercial | Other | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 264 | 120 | 294
Municipal |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 0 | 0 | 0
Current | 36,113 | 51,128 | 48,717
Total | 36,113 | 51,128 | 48,717
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 | 76 | 0
Current | 13,239 | 17,667 | 14,583
Total | 13,239 | 17,743 | 14,583
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 | 76 | 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 | 7,279 | 6,638 | 4,275
Current | 474,070 | 462,507 | 449,313
Total | 481,349 | 469,145 | 453,588
90 Days or More & Accruing | 664 | 339 | 0
Residential | Term | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 1,079 | 1,097 | 531
Residential | Term | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 2,302 | 3,518 | 2,014
Residential | Term | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 3,898 | 2,023 | 1,730
Home equity line of credit |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 1,242 | 3,731 | 1,528
Current | 93,521 | 94,738 | 106,138
Total | 94,763 | 98,469 | 107,666
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 | 698 | 2,819 | 915
Home equity line of credit | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 197 | 419 | 38
Home equity line of credit | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 347 | 493 | 575
Consumer |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 375 | 289 | 125
Current | 25,017 | 24,571 | 24,621
Total | 25,392 | 24,860 | 24,746
90 Days or More & Accruing | 8 | 12 | 3
Consumer | 30-59 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 336 | 237 | 70
Consumer | 60-89 Days Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | 30 | 25 | 37
Consumer | 90 Days or More Past Due |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
All Past Due | $ 9 | $ 27 | $ 18

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