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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