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Loans - Impaired Loans by Class (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded Investment, No Related Allowance $ 18,023 $ 19,716 $ 20,889
Recorded Investment, With Related Allowance 13,369 7,867 8,642
Balance of impaired loans 31,392 27,583 29,531
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, No Related Allowance 19,775 21,853 22,947
Unpaid Principal Balance, With Related Allowance 13,698 8,116 8,959
Unpaid Principal Balance 33,473 29,969 31,906
Related Allowance 1,812 974 754
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, No Related Allowance 19,227 19,605 22,808
Average Recorded Investment, With Related Allowance 9,881 8,612 9,890
Average Recorded Investment 29,108 28,217 32,698
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized Interest Income, No Related Allowance 553 781 839
Recognized Interest Income, With Related Allowance 231 323 381
Recognized Interest Income 784 1,104 1,220
Commercial | Real Estate      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded Investment, No Related Allowance 3,791 5,201 7,173
Recorded Investment, With Related Allowance 3,999 4,820 3,544
Balance of impaired loans 7,790 10,021 10,717
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, No Related Allowance 3,996 5,614 7,496
Unpaid Principal Balance, With Related Allowance 4,116 4,925 3,627
Unpaid Principal Balance 8,112 10,539 11,123
Related Allowance 224 505 89
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, No Related Allowance 5,124 6,252 8,990
Average Recorded Investment, With Related Allowance 4,460 4,153 3,066
Average Recorded Investment 9,584 10,405 12,056
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized Interest Income, No Related Allowance 164 220 301
Recognized Interest Income, With Related Allowance 152 186 149
Recognized Interest Income 316 406 450
Commercial | Construction      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded Investment, No Related Allowance 741 0 30
Recorded Investment, With Related Allowance 0 763 996
Balance of impaired loans 741 763 1,026
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, No Related Allowance 741 0 30
Unpaid Principal Balance, With Related Allowance 0 763 996
Unpaid Principal Balance 741 763 1,026
Related Allowance 0 100 302
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, No Related Allowance 62 32 3
Average Recorded Investment, With Related Allowance 699 816 1,153
Average Recorded Investment 761 848 1,156
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized Interest Income, No Related Allowance 38 0 1
Recognized Interest Income, With Related Allowance 0 36 44
Recognized Interest Income 38 36 45
Commercial | Other      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded Investment, No Related Allowance 2,591 1,671 1,163
Recorded Investment, With Related Allowance 7,327 72 71
Balance of impaired loans 9,918 1,743 1,234
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, No Related Allowance 2,671 1,852 1,210
Unpaid Principal Balance, With Related Allowance 7,371 72 77
Unpaid Principal Balance 10,042 1,924 1,287
Related Allowance 1,309 39 8
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, No Related Allowance 1,908 1,074 1,893
Average Recorded Investment, With Related Allowance 2,584 317 256
Average Recorded Investment 4,492 1,391 2,149
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized Interest Income, No Related Allowance 36 86 76
Recognized Interest Income, With Related Allowance 0 0 5
Recognized Interest Income 36 86 81
Municipal      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded Investment, No Related Allowance 0 0 0
Recorded Investment, With Related Allowance 0 0 0
Balance of impaired loans 0 0 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, No Related Allowance 0 0 0
Unpaid Principal Balance, With Related Allowance 0 0 0
Unpaid Principal Balance 0 0 0
Related Allowance 0 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, No Related Allowance 0 0 0
Average Recorded Investment, With Related Allowance 0 0 0
Average Recorded Investment 0 0 0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized Interest Income, No Related Allowance 0 0 0
Recognized Interest Income, With Related Allowance 0 0 0
Recognized Interest Income 0 0 0
Residential | Construction      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded Investment, No Related Allowance 0 0 0
Recorded Investment, With Related Allowance 0 0 0
Balance of impaired loans 0 0 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, No Related Allowance 0 0 0
Unpaid Principal Balance, With Related Allowance 0 0 0
Unpaid Principal Balance 0 0 0
Related Allowance 0 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, No Related Allowance 0 0 0
Average Recorded Investment, With Related Allowance 0 0 0
Average Recorded Investment 0 0 0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized Interest Income, No Related Allowance 0 0 0
Recognized Interest Income, With Related Allowance 0 0 0
Recognized Interest Income 0 0 0
Residential | Term      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded Investment, No Related Allowance 9,769 11,483 11,122
Recorded Investment, With Related Allowance 1,979 2,186 3,966
Balance of impaired loans 11,748 13,669 15,088
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, No Related Allowance 10,909 12,654 12,157
Unpaid Principal Balance, With Related Allowance 2,144 2,328 4,193
Unpaid Principal Balance 13,053 14,982 16,350
Related Allowance 255 304 326
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, No Related Allowance 10,770 11,025 10,480
Average Recorded Investment, With Related Allowance 2,106 3,209 5,228
Average Recorded Investment 12,876 14,234 15,708
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized Interest Income, No Related Allowance 297 442 415
Recognized Interest Income, With Related Allowance 79 101 180
Recognized Interest Income 376 543 595
Home Equity LIne of Credit      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded Investment, No Related Allowance 1,115 1,361 1,401
Recorded Investment, With Related Allowance 64 26 65
Balance of impaired loans 1,179 1,387 1,466
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, No Related Allowance 1,429 1,733 2,054
Unpaid Principal Balance, With Related Allowance 67 28 66
Unpaid Principal Balance 1,496 1,761 2,120
Related Allowance 24 26 29
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, No Related Allowance 1,351 1,213 1,400
Average Recorded Investment, With Related Allowance 32 69 187
Average Recorded Investment 1,383 1,282 1,587
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized Interest Income, No Related Allowance 18 33 43
Recognized Interest Income, With Related Allowance 0 0 3
Recognized Interest Income 18 33 46
Consumer      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded Investment, No Related Allowance 16 0 0
Recorded Investment, With Related Allowance 0 0 0
Balance of impaired loans 16 0 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, No Related Allowance 29 0 0
Unpaid Principal Balance, With Related Allowance 0 0 0
Unpaid Principal Balance 29 0 0
Related Allowance 0 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, No Related Allowance 12 9 42
Average Recorded Investment, With Related Allowance 0 48 0
Average Recorded Investment 12 57 42
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized Interest Income, No Related Allowance 0 0 3
Recognized Interest Income, With Related Allowance 0 0 0
Recognized Interest Income $ 0 $ 0 $ 3