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Loans - Impaired Loans by Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance $ 19,348 $ 21,216 $ 19,348 $ 21,216 $ 20,889
Recorded investment, with related allowance 8,837 9,570 8,837 9,570 8,642
Recorded Investment 28,185 30,786 28,185 30,786 29,531
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 21,033 23,313 21,033 23,313 22,947
Unpaid principal balance with related allowance 9,235 9,963 9,235 9,963 8,959
Unpaid Principal Balance 30,268 33,276 30,268 33,276 31,906
Related Allowance 949 826 949 826 754
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average Recorded Investment, with no related allowance 18,714 21,420 19,625 23,408 22,808
Average recorded investment, with related allowance 9,330 9,938 8,741 10,094 9,890
Average Recorded Investment 28,044 31,358 28,366 33,502 32,698
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Interest income, cash basis method, with no related allowance 200 215 589 630 839
Interest income, cash basis method, with related allowance 92 96 260 318 381
Interest income, cash basis method 292 311 849 948 1,220
Commercial | Real estate          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 5,530 7,976 5,530 7,976 7,173
Recorded investment, with related allowance 4,912 3,252 4,912 3,252 3,544
Recorded Investment 10,442 11,228 10,442 11,228 10,717
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 5,601 8,444 5,601 8,444 7,496
Unpaid principal balance with related allowance 5,094 3,332 5,094 3,332 3,627
Unpaid Principal Balance 10,695 11,776 10,695 11,776 11,123
Related Allowance 381 71 381 71 89
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average Recorded Investment, with no related allowance 5,540 8,310 6,559 9,410 8,990
Average recorded investment, with related allowance 4,899 3,294 3,940 2,969 3,066
Average Recorded Investment 10,439 11,604 10,499 12,379 12,056
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Interest income, cash basis method, with no related allowance 41 65 186 247 301
Interest income, cash basis method, with related allowance 59 37 130 108 149
Interest income, cash basis method 100 102 316 355 450
Commercial | Construction          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 0 0 0 0 30
Recorded investment, with related allowance 788 996 788 996 996
Recorded Investment 788 996 788 996 1,026
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 0 0 0 0 30
Unpaid principal balance with related allowance 788 996 788 996 996
Unpaid Principal Balance 788 996 788 996 1,026
Related Allowance 99 282 99 282 302
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average Recorded Investment, with no related allowance 10 0 43 0 3
Average recorded investment, with related allowance 788 996 834 1,206 1,153
Average Recorded Investment 798 996 877 1,206 1,156
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Interest income, cash basis method, with no related allowance 0 0 1 0 1
Interest income, cash basis method, with related allowance 9 13 27 38 44
Interest income, cash basis method 9 13 28 38 45
Commercial | Other          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 754 1,660 754 1,660 1,163
Recorded investment, with related allowance 500 76 500 76 71
Recorded Investment 1,254 1,736 1,254 1,736 1,234
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 801 1,728 801 1,728 1,210
Unpaid principal balance with related allowance 503 83 503 83 77
Unpaid Principal Balance 1,304 1,811 1,304 1,811 1,287
Related Allowance 68 8 68 8 8
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average Recorded Investment, with no related allowance 883 1,698 1,016 2,077 1,893
Average recorded investment, with related allowance 519 152 312 317 256
Average Recorded Investment 1,402 1,850 1,328 2,394 2,149
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Interest income, cash basis method, with no related allowance 12 34 33 76 76
Interest income, cash basis method, with related allowance 9 0 21 4 5
Interest income, cash basis method 21 34 54 80 81
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]          
Interest income, cash basis method, with no related allowance 0 0 0 0 0
Interest income, cash basis method, with related allowance 0 0 0 0 0
Interest income, cash basis method 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]          
Interest income, cash basis method, with no related allowance 0 0 0 0 0
Interest income, cash basis method, with related allowance 0 0 0 0 0
Interest income, cash basis method 0 0 0 0 0
Residential | Term          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 11,675 10,096 11,675 10,096 11,122
Recorded investment, with related allowance 2,456 5,180 2,456 5,180 3,966
Recorded Investment 14,131 15,276 14,131 15,276 15,088
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 12,830 11,006 12,830 11,006 12,157
Unpaid principal balance with related allowance 2,667 5,485 2,667 5,485 4,193
Unpaid Principal Balance 15,497 16,491 15,497 16,491 16,350
Related Allowance 318 435 318 435 326
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average Recorded Investment, with no related allowance 11,183 9,852 10,830 10,482 10,480
Average recorded investment, with related allowance 2,929 5,429 3,529 5,375 5,228
Average Recorded Investment 14,112 15,281 14,359 15,857 15,708
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Interest income, cash basis method, with no related allowance 131 95 340 268 415
Interest income, cash basis method, with related allowance 13 46 79 166 180
Interest income, cash basis method 144 141 419 434 595
Home equity line of credit          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 1,334 1,484 1,334 1,484 1,401
Recorded investment, with related allowance 66 66 66 66 65
Recorded Investment 1,400 1,550 1,400 1,550 1,466
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 1,705 2,135 1,705 2,135 2,054
Unpaid principal balance with related allowance 68 67 68 67 66
Unpaid Principal Balance 1,773 2,202 1,773 2,202 2,120
Related Allowance 32 30 32 30 29
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average Recorded Investment, with no related allowance 1,080 1,498 1,171 1,383 1,400
Average recorded investment, with related allowance 80 67 75 227 187
Average Recorded Investment 1,160 1,565 1,246 1,610 1,587
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Interest income, cash basis method, with no related allowance 13 21 26 36 43
Interest income, cash basis method, with related allowance 0 0 1 2 3
Interest income, cash basis method 13 21 27 38 46
Consumer          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 55 0 55 0 0
Recorded investment, with related allowance 115 0 115 0 0
Recorded Investment 170 0 170 0 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 96 0 96 0 0
Unpaid principal balance with related allowance 115 0 115 0 0
Unpaid Principal Balance 211 0 211 0 0
Related Allowance 51 0 51 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average Recorded Investment, with no related allowance 18 62 6 56 42
Average recorded investment, with related allowance 115 0 51 0 0
Average Recorded Investment 133 62 57 56 42
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Interest income, cash basis method, with no related allowance 3 0 3 3 3
Interest income, cash basis method, with related allowance 2 0 2 0 0
Interest income, cash basis method $ 5 $ 0 $ 5 $ 3 $ 3