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Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | $ 19,822 | $ 19,348 | $ 19,822 | $ 19,348 | $ 19,716
Recorded investment, with related allowance | 15,238 | 8,837 | 15,238 | 8,837 | 7,867
Recorded Investment | 35,060 | 28,185 | 35,060 | 28,185 | 27,583
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 21,856 | 21,033 | 21,856 | 21,033 | 21,853
Unpaid principal balance with related allowance | 15,799 | 9,235 | 15,799 | 9,235 | 8,116
Unpaid Principal Balance | 37,655 | 30,268 | 37,655 | 30,268 | 29,969
Related Allowance | 1,916 | 949 | 1,916 | 949 | 974
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 19,424 | 18,714 | 19,584 | 19,625 | 19,605
Average recorded investment, with related allowance | 10,059 | 9,330 | 8,406 | 8,741 | 8,612
Average Recorded Investment | 29,483 | 28,044 | 27,990 | 28,366 | 28,217
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 146 | 200 | 440 | 589 | 781
Recognized interest income, with related allowance | 75 | 92 | 219 | 260 | 323
Recognized Interest Income | 221 | 292 | 659 | 849 | 1,104
Commercial | Real estate |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 5,281 | 5,530 | 5,281 | 5,530 | 5,201
Recorded investment, with related allowance | 4,555 | 4,912 | 4,555 | 4,912 | 4,820
Recorded Investment | 9,836 | 10,442 | 9,836 | 10,442 | 10,021
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 5,634 | 5,601 | 5,634 | 5,601 | 5,614
Unpaid principal balance with related allowance | 4,891 | 5,094 | 4,891 | 5,094 | 4,925
Unpaid Principal Balance | 10,525 | 10,695 | 10,525 | 10,695 | 10,539
Related Allowance | 347 | 381 | 347 | 381 | 505
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 5,398 | 5,540 | 5,418 | 6,559 | 6,252
Average recorded investment, with related allowance | 4,360 | 4,899 | 4,549 | 3,940 | 4,153
Average Recorded Investment | 9,758 | 10,439 | 9,967 | 10,499 | 10,405
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 55 | 41 | 149 | 186 | 220
Recognized interest income, with related allowance | 40 | 59 | 125 | 130 | 186
Recognized Interest Income | 95 | 100 | 274 | 316 | 406
Commercial | Construction |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 0 | 0 | 0 | 0 | 0
Recorded investment, with related allowance | 763 | 788 | 763 | 788 | 763
Recorded Investment | 763 | 788 | 763 | 788 | 763
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 | 763 | 788 | 763 | 788 | 763
Unpaid Principal Balance | 763 | 788 | 763 | 788 | 763
Related Allowance | 108 | 99 | 108 | 99 | 100
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 0 | 10 | 0 | 43 | 32
Average recorded investment, with related allowance | 763 | 788 | 763 | 834 | 816
Average Recorded Investment | 763 | 798 | 763 | 877 | 848
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 0 | 0 | 0 | 1 | 0
Recognized interest income, with related allowance | 10 | 9 | 28 | 27 | 36
Recognized Interest Income | 10 | 9 | 28 | 28 | 36
Commercial | Other |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 2,862 | 754 | 2,862 | 754 | 1,671
Recorded investment, with related allowance | 7,388 | 500 | 7,388 | 500 | 72
Recorded Investment | 10,250 | 1,254 | 10,250 | 1,254 | 1,743
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 2,955 | 801 | 2,955 | 801 | 1,852
Unpaid principal balance with related allowance | 7,392 | 503 | 7,392 | 503 | 72
Unpaid Principal Balance | 10,347 | 1,304 | 10,347 | 1,304 | 1,924
Related Allowance | 1,130 | 68 | 1,130 | 68 | 39
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 1,879 | 883 | 1,631 | 1,016 | 1,074
Average recorded investment, with related allowance | 2,618 | 519 | 991 | 312 | 317
Average Recorded Investment | 4,497 | 1,402 | 2,622 | 1,328 | 1,391
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 12 | 12 | 37 | 33 | 86
Recognized interest income, with related allowance | 0 | 9 | 0 | 21 | 0
Recognized Interest Income | 12 | 21 | 37 | 54 | 86
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 | 10,133 | 11,675 | 10,133 | 11,675 | 11,483
Recorded investment, with related allowance | 2,508 | 2,456 | 2,508 | 2,456 | 2,186
Recorded Investment | 12,641 | 14,131 | 12,641 | 14,131 | 13,669
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 11,358 | 12,830 | 11,358 | 12,830 | 12,654
Unpaid principal balance with related allowance | 2,726 | 2,667 | 2,726 | 2,667 | 2,328
Unpaid Principal Balance | 14,084 | 15,497 | 14,084 | 15,497 | 14,982
Related Allowance | 307 | 318 | 307 | 318 | 304
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 10,645 | 11,183 | 11,110 | 10,830 | 11,025
Average recorded investment, with related allowance | 2,293 | 2,929 | 2,078 | 3,529 | 3,209
Average Recorded Investment | 12,938 | 14,112 | 13,188 | 14,359 | 14,234
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 75 | 131 | 236 | 340 | 442
Recognized interest income, with related allowance | 25 | 13 | 66 | 79 | 101
Recognized Interest Income | 100 | 144 | 302 | 419 | 543
Home equity line of credit |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 1,495 | 1,334 | 1,495 | 1,334 | 1,361
Recorded investment, with related allowance | 24 | 66 | 24 | 66 | 26
Recorded Investment | 1,519 | 1,400 | 1,519 | 1,400 | 1,387
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 1,807 | 1,705 | 1,807 | 1,705 | 1,733
Unpaid principal balance with related allowance | 27 | 68 | 27 | 68 | 28
Unpaid Principal Balance | 1,834 | 1,773 | 1,834 | 1,773 | 1,761
Related Allowance | 24 | 32 | 24 | 32 | 26
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 1,479 | 1,080 | 1,417 | 1,171 | 1,213
Average recorded investment, with related allowance | 25 | 80 | 25 | 75 | 69
Average Recorded Investment | 1,504 | 1,160 | 1,442 | 1,246 | 1,282
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 4 | 13 | 18 | 26 | 33
Recognized interest income, with related allowance | 0 | 0 | 0 | 1 | 0
Recognized Interest Income | 4 | 13 | 18 | 27 | 33
Consumer |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 51 | 55 | 51 | 55 | 0
Recorded investment, with related allowance | 0 | 115 | 0 | 115 | 0
Recorded Investment | 51 | 170 | 51 | 170 | 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 102 | 96 | 102 | 96 | 0
Unpaid principal balance with related allowance | 0 | 115 | 0 | 115 | 0
Unpaid Principal Balance | 102 | 211 | 102 | 211 | 0
Related Allowance | 0 | 51 | 0 | 51 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 23 | 18 | 8 | 6 | 9
Average recorded investment, with related allowance | 0 | 115 | 0 | 51 | 48
Average Recorded Investment | 23 | 133 | 8 | 57 | 57
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 0 | 3 | 0 | 3 | 0
Recognized interest income, with related allowance | 0 | 2 | 0 | 2 | 0
Recognized Interest Income | $ 0 | $ 5 | $ 0 | $ 5 | $ 0

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