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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