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Loans - Impaired Loans by Class (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded Investment, No Related Allowance $ 21,030 $ 18,023 $ 19,716
Recorded Investment, With Related Allowance 10,721 13,369 7,867
Balance of impaired loans 31,751 31,392 27,583
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, No Related Allowance 22,831 19,775 21,853
Unpaid Principal Balance, With Related Allowance 11,397 13,698 8,116
Unpaid Principal Balance 34,228 33,473 29,969
Related Allowance 2,308 1,812 974
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, No Related Allowance 18,776 19,227 19,605
Average Recorded Investment, With Related Allowance 13,029 9,881 8,612
Average Recorded Investment 31,805 29,108 28,217
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized Interest Income, No Related Allowance 764 553 781
Recognized Interest Income, With Related Allowance 100 231 323
Recognized Interest Income 864 784 1,104
Commercial | Real Estate      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded Investment, No Related Allowance 8,718 3,791 5,201
Recorded Investment, With Related Allowance 1,042 3,999 4,820
Balance of impaired loans 9,760 7,790 10,021
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, No Related Allowance 9,161 3,996 5,614
Unpaid Principal Balance, With Related Allowance 1,059 4,116 4,925
Unpaid Principal Balance 10,220 8,112 10,539
Related Allowance 260 224 505
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, No Related Allowance 5,536 5,124 6,252
Average Recorded Investment, With Related Allowance 3,477 4,460 4,153
Average Recorded Investment 9,013 9,584 10,405
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized Interest Income, No Related Allowance 380 164 220
Recognized Interest Income, With Related Allowance 42 152 186
Recognized Interest Income 422 316 406
Commercial | Construction      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded Investment, No Related Allowance 721 741 0
Recorded Investment, With Related Allowance 0 0 763
Balance of impaired loans 721 741 763
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, No Related Allowance 721 741 0
Unpaid Principal Balance, With Related Allowance 0 0 763
Unpaid Principal Balance 721 741 763
Related Allowance 0 0 100
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, No Related Allowance 762 62 32
Average Recorded Investment, With Related Allowance 0 699 816
Average Recorded Investment 762 761 848
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized Interest Income, No Related Allowance 43 38 0
Recognized Interest Income, With Related Allowance 0 0 36
Recognized Interest Income 43 38 36
Commercial | Other      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded Investment, No Related Allowance 1,468 2,591 1,671
Recorded Investment, With Related Allowance 7,791 7,327 72
Balance of impaired loans 9,259 9,918 1,743
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, No Related Allowance 1,555 2,671 1,852
Unpaid Principal Balance, With Related Allowance 8,216 7,371 72
Unpaid Principal Balance 9,771 10,042 1,924
Related Allowance 1,696 1,309 39
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, No Related Allowance 2,037 1,908 1,074
Average Recorded Investment, With Related Allowance 7,471 2,584 317
Average Recorded Investment 9,508 4,492 1,391
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized Interest Income, No Related Allowance 32 36 86
Recognized Interest Income, With Related Allowance 5 0 0
Recognized Interest Income 37 36 86
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 9,136 9,769 11,483
Recorded Investment, With Related Allowance 1,768 1,979 2,186
Balance of impaired loans 10,904 11,748 13,669
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, No Related Allowance 10,317 10,909 12,654
Unpaid Principal Balance, With Related Allowance 1,998 2,144 2,328
Unpaid Principal Balance 12,315 13,053 14,982
Related Allowance 335 255 304
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, No Related Allowance 9,427 10,770 11,025
Average Recorded Investment, With Related Allowance 1,982 2,106 3,209
Average Recorded Investment 11,409 12,876 14,234
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized Interest Income, No Related Allowance 289 297 442
Recognized Interest Income, With Related Allowance 53 79 101
Recognized Interest Income 342 376 543
Home Equity LIne of Credit      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded Investment, No Related Allowance 972 1,115 1,361
Recorded Investment, With Related Allowance 120 64 26
Balance of impaired loans 1,092 1,179 1,387
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, No Related Allowance 1,035 1,429 1,733
Unpaid Principal Balance, With Related Allowance 124 67 28
Unpaid Principal Balance 1,159 1,496 1,761
Related Allowance 17 24 26
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, No Related Allowance 1,001 1,351 1,213
Average Recorded Investment, With Related Allowance 99 32 69
Average Recorded Investment 1,100 1,383 1,282
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized Interest Income, No Related Allowance 20 18 33
Recognized Interest Income, With Related Allowance 0 0 0
Recognized Interest Income 20 18 33
Consumer      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded Investment, No Related Allowance 15 16 0
Recorded Investment, With Related Allowance 0 0 0
Balance of impaired loans 15 16 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, No Related Allowance 42 29 0
Unpaid Principal Balance, With Related Allowance 0 0 0
Unpaid Principal Balance 42 29 0
Related Allowance 0 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, No Related Allowance 13 12 9
Average Recorded Investment, With Related Allowance 0 0 48
Average Recorded Investment 13 12 57
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