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Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | $ 18,708 | $ 19,822 | $ 18,708 | $ 19,822 | $ 18,023
Recorded investment, with related allowance | 13,390 | 15,238 | 13,390 | 15,238 | 13,369
Recorded Investment | 32,098 | 35,060 | 32,098 | 35,060 | 31,392
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 20,389 | 21,856 | 20,389 | 21,856 | 19,775
Unpaid principal balance with related allowance | 13,905 | 15,799 | 13,905 | 15,799 | 13,698
Unpaid Principal Balance | 34,294 | 37,655 | 34,294 | 37,655 | 33,473
Related Allowance | 2,402 | 1,916 | 2,402 | 1,916 | 1,812
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 18,815 | 19,424 | 18,561 | 19,584 | 19,227
Average recorded investment, with related allowance | 13,352 | 10,059 | 13,191 | 8,406 | 9,881
Average Recorded Investment | 32,167 | 29,483 | 31,752 | 27,990 | 29,108
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 180 | 146 | 488 | 440 | 553
Recognized interest income, with related allowance | 52 | 75 | 167 | 219 | 231
Recognized Interest Income | 232 | 221 | 655 | 659 | 784
Commercial | Real estate |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 5,954 | 5,281 | 5,954 | 5,281 | 3,791
Recorded investment, with related allowance | 3,456 | 4,555 | 3,456 | 4,555 | 3,999
Recorded Investment | 9,410 | 9,836 | 9,410 | 9,836 | 7,790
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 6,275 | 5,634 | 6,275 | 5,634 | 3,996
Unpaid principal balance with related allowance | 3,474 | 4,891 | 3,474 | 4,891 | 4,116
Unpaid Principal Balance | 9,749 | 10,525 | 9,749 | 10,525 | 8,112
Related Allowance | 265 | 347 | 265 | 347 | 224
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 5,966 | 5,398 | 5,099 | 5,418 | 5,124
Average recorded investment, with related allowance | 3,461 | 4,360 | 3,700 | 4,549 | 4,460
Average Recorded Investment | 9,427 | 9,758 | 8,799 | 9,967 | 9,584
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 84 | 55 | 194 | 149 | 164
Recognized interest income, with related allowance | 30 | 40 | 97 | 125 | 152
Recognized Interest Income | 114 | 95 | 291 | 274 | 316
Commercial | Construction |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 741 | 0 | 741 | 0 | 741
Recorded investment, with related allowance | 0 | 763 | 0 | 763 | 0
Recorded Investment | 741 | 763 | 741 | 763 | 741
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 741 | 0 | 741 | 0 | 741
Unpaid principal balance with related allowance | 0 | 763 | 0 | 763 | 0
Unpaid Principal Balance | 741 | 763 | 741 | 763 | 741
Related Allowance | 0 | 108 | 0 | 108 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 741 | 0 | 773 | 0 | 62
Average recorded investment, with related allowance | 0 | 763 | 0 | 763 | 699
Average Recorded Investment | 741 | 763 | 773 | 763 | 761
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 11 | 0 | 32 | 0 | 38
Recognized interest income, with related allowance | 0 | 10 | 0 | 28 | 0
Recognized Interest Income | 11 | 10 | 32 | 28 | 38
Commercial | Other |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 1,926 | 2,862 | 1,926 | 2,862 | 2,591
Recorded investment, with related allowance | 7,923 | 7,388 | 7,923 | 7,388 | 7,327
Recorded Investment | 9,849 | 10,250 | 9,849 | 10,250 | 9,918
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 2,044 | 2,955 | 2,044 | 2,955 | 2,671
Unpaid principal balance with related allowance | 8,231 | 7,392 | 8,231 | 7,392 | 7,371
Unpaid Principal Balance | 10,275 | 10,347 | 10,275 | 10,347 | 10,042
Related Allowance | 1,890 | 1,130 | 1,890 | 1,130 | 1,309
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 1,865 | 1,879 | 2,146 | 1,631 | 1,908
Average recorded investment, with related allowance | 7,682 | 2,618 | 7,345 | 991 | 2,584
Average Recorded Investment | 9,547 | 4,497 | 9,491 | 2,622 | 4,492
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 8 | 12 | 25 | 37 | 36
Recognized interest income, with related allowance | 0 | 0 | 0 | 0 | 0
Recognized Interest Income | 8 | 12 | 25 | 37 | 36
Municipal |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 0 | 0 | 0 | 0 | 0
Recorded investment, with related allowance | 0 | 0 | 0 | 0 | 0
Recorded Investment | 0 | 0 | 0 | 0 | 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 0 | 0 | 0 | 0 | 0
Unpaid principal balance with related allowance | 0 | 0 | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0 | 0 | 0
Related Allowance | 0 | 0 | 0 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 0 | 0 | 0 | 0 | 0
Average recorded investment, with related allowance | 0 | 0 | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0 | 0 | 0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 0 | 0 | 0 | 0 | 0
Recognized interest income, with related allowance | 0 | 0 | 0 | 0 | 0
Recognized Interest Income | 0 | 0 | 0 | 0 | 0
Residential | Construction |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 0 | 0 | 0 | 0 | 0
Recorded investment, with related allowance | 0 | 0 | 0 | 0 | 0
Recorded Investment | 0 | 0 | 0 | 0 | 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 0 | 0 | 0 | 0 | 0
Unpaid principal balance with related allowance | 0 | 0 | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0 | 0 | 0
Related Allowance | 0 | 0 | 0 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 0 | 0 | 0 | 0 | 0
Average recorded investment, with related allowance | 0 | 0 | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0 | 0 | 0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 0 | 0 | 0 | 0 | 0
Recognized interest income, with related allowance | 0 | 0 | 0 | 0 | 0
Recognized Interest Income | 0 | 0 | 0 | 0 | 0
Residential | Term |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 9,019 | 10,133 | 9,019 | 10,133 | 9,769
Recorded investment, with related allowance | 1,909 | 2,508 | 1,909 | 2,508 | 1,979
Recorded Investment | 10,928 | 12,641 | 10,928 | 12,641 | 11,748
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 10,201 | 11,358 | 10,201 | 11,358 | 10,909
Unpaid principal balance with related allowance | 2,085 | 2,726 | 2,085 | 2,726 | 2,144
Unpaid Principal Balance | 12,286 | 14,084 | 12,286 | 14,084 | 13,053
Related Allowance | 238 | 307 | 238 | 307 | 255
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 9,200 | 10,645 | 9,515 | 11,110 | 10,770
Average recorded investment, with related allowance | 2,108 | 2,293 | 2,054 | 2,078 | 2,106
Average Recorded Investment | 11,308 | 12,938 | 11,569 | 13,188 | 12,876
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 71 | 75 | 222 | 236 | 297
Recognized interest income, with related allowance | 22 | 25 | 70 | 66 | 79
Recognized Interest Income | 93 | 100 | 292 | 302 | 376
Home equity line of credit |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 1,068 | 1,495 | 1,068 | 1,495 | 1,115
Recorded investment, with related allowance | 100 | 24 | 100 | 24 | 64
Recorded Investment | 1,168 | 1,519 | 1,168 | 1,519 | 1,179
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 1,128 | 1,807 | 1,128 | 1,807 | 1,429
Unpaid principal balance with related allowance | 100 | 27 | 100 | 27 | 67
Unpaid Principal Balance | 1,228 | 1,834 | 1,228 | 1,834 | 1,496
Related Allowance | 7 | 24 | 7 | 24 | 24
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 1,033 | 1,479 | 1,014 | 1,417 | 1,351
Average recorded investment, with related allowance | 100 | 25 | 92 | 25 | 32
Average Recorded Investment | 1,133 | 1,504 | 1,106 | 1,442 | 1,383
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 6 | 4 | 15 | 18 | 18
Recognized interest income, with related allowance | 0 | 0 | 0 | 0 | 0
Recognized Interest Income | 6 | 4 | 15 | 18 | 18
Consumer |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 0 | 51 | 0 | 51 | 16
Recorded investment, with related allowance | 2 | 0 | 2 | 0 | 0
Recorded Investment | 2 | 51 | 2 | 51 | 16
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 0 | 102 | 0 | 102 | 29
Unpaid principal balance with related allowance | 15 | 0 | 15 | 0 | 0
Unpaid Principal Balance | 15 | 102 | 15 | 102 | 29
Related Allowance | 2 | 0 | 2 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 10 | 23 | 14 | 8 | 12
Average recorded investment, with related allowance | 1 | 0 | 0 | 0 | 0
Average Recorded Investment | 11 | 23 | 14 | 8 | 12
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 0 | 0 | 0 | 0 | 0
Recognized interest income, with related allowance | 0 | 0 | 0 | 0 | 0
Recognized Interest Income | $ 0 | $ 0 | $ 0 | $ 0 | $ 0

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