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Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | $ 18,023 | $ 19,716 | $ 20,889
Recorded Investment, With Related Allowance | 13,369 | 7,867 | 8,642
Balance of impaired loans | 31,392 | 27,583 | 29,531
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 19,775 | 21,853 | 22,947
Unpaid Principal Balance, With Related Allowance | 13,698 | 8,116 | 8,959
Unpaid Principal Balance | 33,473 | 29,969 | 31,906
Related Allowance | 1,812 | 974 | 754
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 19,227 | 19,605 | 22,808
Average Recorded Investment, With Related Allowance | 9,881 | 8,612 | 9,890
Average Recorded Investment | 29,108 | 28,217 | 32,698
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 553 | 781 | 839
Recognized Interest Income, With Related Allowance | 231 | 323 | 381
Recognized Interest Income | 784 | 1,104 | 1,220
Commercial | Real Estate |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 3,791 | 5,201 | 7,173
Recorded Investment, With Related Allowance | 3,999 | 4,820 | 3,544
Balance of impaired loans | 7,790 | 10,021 | 10,717
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 3,996 | 5,614 | 7,496
Unpaid Principal Balance, With Related Allowance | 4,116 | 4,925 | 3,627
Unpaid Principal Balance | 8,112 | 10,539 | 11,123
Related Allowance | 224 | 505 | 89
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 5,124 | 6,252 | 8,990
Average Recorded Investment, With Related Allowance | 4,460 | 4,153 | 3,066
Average Recorded Investment | 9,584 | 10,405 | 12,056
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 164 | 220 | 301
Recognized Interest Income, With Related Allowance | 152 | 186 | 149
Recognized Interest Income | 316 | 406 | 450
Commercial | Construction |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 741 | 0 | 30
Recorded Investment, With Related Allowance | 0 | 763 | 996
Balance of impaired loans | 741 | 763 | 1,026
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 741 | 0 | 30
Unpaid Principal Balance, With Related Allowance | 0 | 763 | 996
Unpaid Principal Balance | 741 | 763 | 1,026
Related Allowance | 0 | 100 | 302
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 62 | 32 | 3
Average Recorded Investment, With Related Allowance | 699 | 816 | 1,153
Average Recorded Investment | 761 | 848 | 1,156
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 38 | 0 | 1
Recognized Interest Income, With Related Allowance | 0 | 36 | 44
Recognized Interest Income | 38 | 36 | 45
Commercial | Other |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 2,591 | 1,671 | 1,163
Recorded Investment, With Related Allowance | 7,327 | 72 | 71
Balance of impaired loans | 9,918 | 1,743 | 1,234
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 2,671 | 1,852 | 1,210
Unpaid Principal Balance, With Related Allowance | 7,371 | 72 | 77
Unpaid Principal Balance | 10,042 | 1,924 | 1,287
Related Allowance | 1,309 | 39 | 8
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 1,908 | 1,074 | 1,893
Average Recorded Investment, With Related Allowance | 2,584 | 317 | 256
Average Recorded Investment | 4,492 | 1,391 | 2,149
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 36 | 86 | 76
Recognized Interest Income, With Related Allowance | 0 | 0 | 5
Recognized Interest Income | 36 | 86 | 81
Municipal |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 0 | 0 | 0
Recorded Investment, With Related Allowance | 0 | 0 | 0
Balance of impaired loans | 0 | 0 | 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 0 | 0 | 0
Unpaid Principal Balance, With Related Allowance | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0
Related Allowance | 0 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 0 | 0 | 0
Average Recorded Investment, With Related Allowance | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 0 | 0 | 0
Recognized Interest Income, With Related Allowance | 0 | 0 | 0
Recognized Interest Income | 0 | 0 | 0
Residential | Construction |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 0 | 0 | 0
Recorded Investment, With Related Allowance | 0 | 0 | 0
Balance of impaired loans | 0 | 0 | 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 0 | 0 | 0
Unpaid Principal Balance, With Related Allowance | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0
Related Allowance | 0 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 0 | 0 | 0
Average Recorded Investment, With Related Allowance | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 0 | 0 | 0
Recognized Interest Income, With Related Allowance | 0 | 0 | 0
Recognized Interest Income | 0 | 0 | 0
Residential | Term |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 9,769 | 11,483 | 11,122
Recorded Investment, With Related Allowance | 1,979 | 2,186 | 3,966
Balance of impaired loans | 11,748 | 13,669 | 15,088
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 10,909 | 12,654 | 12,157
Unpaid Principal Balance, With Related Allowance | 2,144 | 2,328 | 4,193
Unpaid Principal Balance | 13,053 | 14,982 | 16,350
Related Allowance | 255 | 304 | 326
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 10,770 | 11,025 | 10,480
Average Recorded Investment, With Related Allowance | 2,106 | 3,209 | 5,228
Average Recorded Investment | 12,876 | 14,234 | 15,708
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 297 | 442 | 415
Recognized Interest Income, With Related Allowance | 79 | 101 | 180
Recognized Interest Income | 376 | 543 | 595
Home Equity LIne of Credit |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 1,115 | 1,361 | 1,401
Recorded Investment, With Related Allowance | 64 | 26 | 65
Balance of impaired loans | 1,179 | 1,387 | 1,466
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 1,429 | 1,733 | 2,054
Unpaid Principal Balance, With Related Allowance | 67 | 28 | 66
Unpaid Principal Balance | 1,496 | 1,761 | 2,120
Related Allowance | 24 | 26 | 29
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 1,351 | 1,213 | 1,400
Average Recorded Investment, With Related Allowance | 32 | 69 | 187
Average Recorded Investment | 1,383 | 1,282 | 1,587
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 18 | 33 | 43
Recognized Interest Income, With Related Allowance | 0 | 0 | 3
Recognized Interest Income | 18 | 33 | 46
Consumer |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 16 | 0 | 0
Recorded Investment, With Related Allowance | 0 | 0 | 0
Balance of impaired loans | 16 | 0 | 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 29 | 0 | 0
Unpaid Principal Balance, With Related Allowance | 0 | 0 | 0
Unpaid Principal Balance | 29 | 0 | 0
Related Allowance | 0 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 12 | 9 | 42
Average Recorded Investment, With Related Allowance | 0 | 48 | 0
Average Recorded Investment | 12 | 57 | 42
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 0 | 0 | 3
Recognized Interest Income, With Related Allowance | 0 | 0 | 0
Recognized Interest Income | $ 0 | $ 0 | $ 3

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