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Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | $ 19,536 | $ 19,491 | $ 19,536 | $ 19,491 | $ 19,716
Recorded investment, with related allowance | 7,108 | 8,702 | 7,108 | 8,702 | 7,867
Recorded Investment | 26,644 | 28,193 | 26,644 | 28,193 | 27,583
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 21,503 | 21,208 | 21,503 | 21,208 | 21,853
Unpaid principal balance with related allowance | 7,481 | 8,879 | 7,481 | 8,879 | 8,116
Unpaid Principal Balance | 28,984 | 30,087 | 28,984 | 30,087 | 29,969
Related Allowance | 594 | 1,029 | 594 | 1,029 | 974
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 19,512 | 19,672 | 19,666 | 20,080 | 19,605
Average recorded investment, with related allowance | 7,431 | 8,408 | 7,581 | 8,446 | 8,612
Average Recorded Investment | 26,943 | 28,080 | 27,247 | 28,526 | 28,217
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 138 | 202 | 288 | 389 | 781
Recognized interest income, with related allowance | 77 | 80 | 150 | 168 | 323
Recognized Interest Income | 215 | 282 | 438 | 557 | 1,104
Commercial | Real estate |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 5,686 | 6,654 | 5,686 | 6,654 | 5,201
Recorded investment, with related allowance | 4,167 | 4,031 | 4,167 | 4,031 | 4,820
Recorded Investment | 9,853 | 10,685 | 9,853 | 10,685 | 10,021
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 6,171 | 6,817 | 6,171 | 6,817 | 5,614
Unpaid principal balance with related allowance | 4,356 | 4,116 | 4,356 | 4,116 | 4,925
Unpaid Principal Balance | 10,527 | 10,933 | 10,527 | 10,933 | 10,539
Related Allowance | 221 | 369 | 221 | 369 | 505
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 5,414 | 6,916 | 5,429 | 7,068 | 6,252
Average recorded investment, with related allowance | 4,549 | 3,518 | 4,644 | 3,458 | 4,153
Average Recorded Investment | 9,963 | 10,434 | 10,073 | 10,526 | 10,405
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 46 | 66 | 94 | 145 | 220
Recognized interest income, with related allowance | 43 | 35 | 85 | 71 | 186
Recognized Interest Income | 89 | 101 | 179 | 216 | 406
Commercial | Construction |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 0 | 46 | 0 | 46 | 0
Recorded investment, with related allowance | 763 | 788 | 763 | 788 | 763
Recorded Investment | 763 | 834 | 763 | 834 | 763
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 0 | 46 | 0 | 46 | 0
Unpaid principal balance with related allowance | 763 | 788 | 763 | 788 | 763
Unpaid Principal Balance | 763 | 834 | 763 | 834 | 763
Related Allowance | 103 | 97 | 103 | 97 | 100
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 0 | 40 | 0 | 60 | 32
Average recorded investment, with related allowance | 763 | 788 | 763 | 857 | 816
Average Recorded Investment | 763 | 828 | 763 | 917 | 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 | 9 | 10 | 18 | 18 | 36
Recognized Interest Income | 9 | 10 | 18 | 19 | 36
Commercial | Other |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 1,405 | 955 | 1,405 | 955 | 1,671
Recorded investment, with related allowance | 228 | 524 | 228 | 524 | 72
Recorded Investment | 1,633 | 1,479 | 1,633 | 1,479 | 1,743
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 1,449 | 994 | 1,449 | 994 | 1,852
Unpaid principal balance with related allowance | 268 | 530 | 268 | 530 | 72
Unpaid Principal Balance | 1,717 | 1,524 | 1,717 | 1,524 | 1,924
Related Allowance | 36 | 158 | 36 | 158 | 39
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 1,418 | 1,045 | 1,507 | 1,083 | 1,074
Average recorded investment, with related allowance | 230 | 337 | 177 | 209 | 317
Average Recorded Investment | 1,648 | 1,382 | 1,684 | 1,292 | 1,391
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 12 | 13 | 19 | 21 | 86
Recognized interest income, with related allowance | 4 | 12 | 6 | 12 | 0
Recognized Interest Income | 16 | 25 | 25 | 33 | 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 | 11,065 | 10,924 | 11,065 | 10,924 | 11,483
Recorded investment, with related allowance | 1,925 | 3,181 | 1,925 | 3,181 | 2,186
Recorded Investment | 12,990 | 14,105 | 12,990 | 14,105 | 13,669
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 12,152 | 12,085 | 12,152 | 12,085 | 12,654
Unpaid principal balance with related allowance | 2,067 | 3,266 | 2,067 | 3,266 | 2,328
Unpaid Principal Balance | 14,219 | 15,351 | 14,219 | 15,351 | 14,982
Related Allowance | 209 | 326 | 209 | 326 | 304
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 11,283 | 10,592 | 11,343 | 10,653 | 11,025
Average recorded investment, with related allowance | 1,864 | 3,664 | 1,971 | 3,830 | 3,209
Average Recorded Investment | 13,147 | 14,256 | 13,314 | 14,483 | 14,234
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 73 | 118 | 161 | 209 | 442
Recognized interest income, with related allowance | 21 | 23 | 41 | 66 | 101
Recognized Interest Income | 94 | 141 | 202 | 275 | 543
Home equity line of credit |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 1,380 | 912 | 1,380 | 912 | 1,361
Recorded investment, with related allowance | 25 | 63 | 25 | 63 | 26
Recorded Investment | 1,405 | 975 | 1,405 | 975 | 1,387
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 1,731 | 1,266 | 1,731 | 1,266 | 1,733
Unpaid principal balance with related allowance | 27 | 64 | 27 | 64 | 28
Unpaid Principal Balance | 1,758 | 1,330 | 1,758 | 1,330 | 1,761
Related Allowance | 25 | 28 | 25 | 28 | 26
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 1,397 | 1,079 | 1,387 | 1,216 | 1,213
Average recorded investment, with related allowance | 25 | 63 | 26 | 73 | 69
Average Recorded Investment | 1,422 | 1,142 | 1,413 | 1,289 | 1,282
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 7 | 5 | 14 | 13 | 33
Recognized interest income, with related allowance | 0 | 0 | 0 | 1 | 0
Recognized Interest Income | 7 | 5 | 14 | 14 | 33
Consumer |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 0 | 0 | 0 | 0 | 0
Recorded investment, with related allowance | 0 | 115 | 0 | 115 | 0
Recorded Investment | 0 | 115 | 0 | 115 | 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 | 115 | 0 | 115 | 0
Unpaid Principal Balance | 0 | 115 | 0 | 115 | 0
Related Allowance | 0 | 51 | 0 | 51 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 0 | 0 | 0 | 0 | 9
Average recorded investment, with related allowance | 0 | 38 | 0 | 19 | 48
Average Recorded Investment | 0 | 38 | 0 | 19 | 57
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

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