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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