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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