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Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | $ 19,287 | $ 19,536 | $ 19,287 | $ 19,536 | $ 18,023
Recorded investment, with related allowance | 12,905 | 7,108 | 12,905 | 7,108 | 13,369
Recorded Investment | 32,192 | 26,644 | 32,192 | 26,644 | 31,392
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 20,983 | 21,503 | 20,983 | 21,503 | 19,775
Unpaid principal balance with related allowance | 13,354 | 7,481 | 13,354 | 7,481 | 13,698
Unpaid Principal Balance | 34,337 | 28,984 | 34,337 | 28,984 | 33,473
Related Allowance | 2,205 | 594 | 2,205 | 594 | 1,812
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 18,854 | 19,512 | 18,433 | 19,666 | 19,227
Average recorded investment, with related allowance | 13,112 | 7,431 | 13,110 | 7,581 | 9,881
Average Recorded Investment | 31,966 | 26,943 | 31,543 | 27,247 | 29,108
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 162 | 138 | 308 | 288 | 553
Recognized interest income, with related allowance | 52 | 77 | 115 | 150 | 231
Recognized Interest Income | 214 | 215 | 423 | 438 | 784
Commercial | Real estate |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 5,438 | 5,686 | 5,438 | 5,686 | 3,791
Recorded investment, with related allowance | 3,470 | 4,167 | 3,470 | 4,167 | 3,999
Recorded Investment | 8,908 | 9,853 | 8,908 | 9,853 | 7,790
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 5,749 | 6,171 | 5,749 | 6,171 | 3,996
Unpaid principal balance with related allowance | 3,488 | 4,356 | 3,488 | 4,356 | 4,116
Unpaid Principal Balance | 9,237 | 10,527 | 9,237 | 10,527 | 8,112
Related Allowance | 270 | 221 | 270 | 221 | 224
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 5,169 | 5,414 | 4,666 | 5,429 | 5,124
Average recorded investment, with related allowance | 3,749 | 4,549 | 3,819 | 4,644 | 4,460
Average Recorded Investment | 8,918 | 9,963 | 8,485 | 10,073 | 9,584
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 56 | 46 | 110 | 94 | 164
Recognized interest income, with related allowance | 28 | 43 | 67 | 85 | 152
Recognized Interest Income | 84 | 89 | 177 | 179 | 316
Commercial | Construction |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 1,027 | 0 | 1,027 | 0 | 741
Recorded investment, with related allowance | 0 | 763 | 0 | 763 | 0
Recorded Investment | 1,027 | 763 | 1,027 | 763 | 741
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 1,027 | 0 | 1,027 | 0 | 741
Unpaid principal balance with related allowance | 0 | 763 | 0 | 763 | 0
Unpaid Principal Balance | 1,027 | 763 | 1,027 | 763 | 741
Related Allowance | 0 | 103 | 0 | 103 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 837 | 0 | 789 | 0 | 62
Average recorded investment, with related allowance | 0 | 763 | 0 | 763 | 699
Average Recorded Investment | 837 | 763 | 789 | 763 | 761
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 11 | 0 | 21 | 0 | 38
Recognized interest income, with related allowance | 0 | 9 | 0 | 18 | 0
Recognized Interest Income | 11 | 9 | 21 | 18 | 38
Commercial | Other |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 2,265 | 1,405 | 2,265 | 1,405 | 2,591
Recorded investment, with related allowance | 7,174 | 228 | 7,174 | 228 | 7,327
Recorded Investment | 9,439 | 1,633 | 9,439 | 1,633 | 9,918
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 2,349 | 1,449 | 2,349 | 1,449 | 2,671
Unpaid principal balance with related allowance | 7,388 | 268 | 7,388 | 268 | 7,371
Unpaid Principal Balance | 9,737 | 1,717 | 9,737 | 1,717 | 10,042
Related Allowance | 1,647 | 36 | 1,647 | 36 | 1,309
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 2,272 | 1,418 | 2,287 | 1,507 | 1,908
Average recorded investment, with related allowance | 7,170 | 230 | 7,176 | 177 | 2,584
Average Recorded Investment | 9,442 | 1,648 | 9,463 | 1,684 | 4,492
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 11 | 12 | 17 | 19 | 36
Recognized interest income, with related allowance | 0 | 4 | 0 | 6 | 0
Recognized Interest Income | 11 | 16 | 17 | 25 | 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 | 9,613 | 11,065 | 9,613 | 11,065 | 9,769
Recorded investment, with related allowance | 2,161 | 1,925 | 2,161 | 1,925 | 1,979
Recorded Investment | 11,774 | 12,990 | 11,774 | 12,990 | 11,748
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 10,808 | 12,152 | 10,808 | 12,152 | 10,909
Unpaid principal balance with related allowance | 2,378 | 2,067 | 2,378 | 2,067 | 2,144
Unpaid Principal Balance | 13,186 | 14,219 | 13,186 | 14,219 | 13,053
Related Allowance | 286 | 209 | 286 | 209 | 255
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 9,642 | 11,283 | 9,671 | 11,343 | 10,770
Average recorded investment, with related allowance | 2,086 | 1,864 | 2,027 | 1,971 | 2,106
Average Recorded Investment | 11,728 | 13,147 | 11,698 | 13,314 | 12,876
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 80 | 73 | 151 | 161 | 297
Recognized interest income, with related allowance | 24 | 21 | 48 | 41 | 79
Recognized Interest Income | 104 | 94 | 199 | 202 | 376
Home equity line of credit |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 928 | 1,380 | 928 | 1,380 | 1,115
Recorded investment, with related allowance | 100 | 25 | 100 | 25 | 64
Recorded Investment | 1,028 | 1,405 | 1,028 | 1,405 | 1,179
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 1,021 | 1,731 | 1,021 | 1,731 | 1,429
Unpaid principal balance with related allowance | 100 | 27 | 100 | 27 | 67
Unpaid Principal Balance | 1,121 | 1,758 | 1,121 | 1,758 | 1,496
Related Allowance | 2 | 25 | 2 | 25 | 24
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 918 | 1,397 | 1,004 | 1,387 | 1,351
Average recorded investment, with related allowance | 107 | 25 | 88 | 26 | 32
Average Recorded Investment | 1,025 | 1,422 | 1,092 | 1,413 | 1,383
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 4 | 7 | 9 | 14 | 18
Recognized interest income, with related allowance | 0 | 0 | 0 | 0 | 0
Recognized Interest Income | 4 | 7 | 9 | 14 | 18
Consumer |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 16 | 0 | 16 | 0 | 16
Recorded investment, with related allowance | 0 | 0 | 0 | 0 | 0
Recorded Investment | 16 | 0 | 16 | 0 | 16
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 29 | 0 | 29 | 0 | 29
Unpaid principal balance with related allowance | 0 | 0 | 0 | 0 | 0
Unpaid Principal Balance | 29 | 0 | 29 | 0 | 29
Related Allowance | 0 | 0 | 0 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 16 | 0 | 16 | 0 | 12
Average recorded investment, with related allowance | 0 | 0 | 0 | 0 | 0
Average Recorded Investment | 16 | 0 | 16 | 0 | 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

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