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Loans - Impaired Loans by Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance $ 20,693 $ 18,708 $ 20,693 $ 18,708 $ 21,030
Recorded investment, with related allowance 11,516 13,390 11,516 13,390 10,721
Recorded Investment 32,209 32,098 32,209 32,098 31,751
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 22,738 20,389 22,738 20,389 22,831
Unpaid principal balance with related allowance 12,398 13,905 12,398 13,905 11,397
Unpaid Principal Balance 35,136 34,294 35,136 34,294 34,228
Related Allowance 2,060 2,402 2,060 2,402 2,308
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 20,547 18,815 20,697 18,561 18,776
Average recorded investment, with related allowance 11,294 13,352 10,862 13,191 13,029
Average Recorded Investment 31,841 32,167 31,559 31,752 31,805
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 172 180 541 488 764
Recognized interest income, with related allowance 49 52 134 167 100
Recognized Interest Income 221 232 675 655 864
Commercial | Real estate          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 7,332 5,954 7,332 5,954 8,718
Recorded investment, with related allowance 1,717 3,456 1,717 3,456 1,042
Recorded Investment 9,049 9,410 9,049 9,410 9,760
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 7,630 6,275 7,630 6,275 9,161
Unpaid principal balance with related allowance 1,732 3,474 1,732 3,474 1,059
Unpaid Principal Balance 9,362 9,749 9,362 9,749 10,220
Related Allowance 258 265 258 265 260
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 7,242 5,966 7,929 5,099 5,536
Average recorded investment, with related allowance 1,721 3,461 1,538 3,700 3,477
Average Recorded Investment 8,963 9,427 9,467 8,799 9,013
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 83 84 266 194 380
Recognized interest income, with related allowance 23 30 72 97 42
Recognized Interest Income 106 114 338 291 422
Commercial | Construction          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 978 741 978 741 721
Recorded investment, with related allowance 0 0 0 0 0
Recorded Investment 978 741 978 741 721
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 990 741 990 741 721
Unpaid principal balance with related allowance 0 0 0 0 0
Unpaid Principal Balance 990 741 990 741 721
Related Allowance 0 0 0 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 980 741 929 773 762
Average recorded investment, with related allowance 0 0 0 0 0
Average Recorded Investment 980 741 929 773 762
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 12 11 35 32 43
Recognized interest income, with related allowance 0 0 0 0 0
Recognized Interest Income 12 11 35 32 43
Commercial | Other          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 892 1,926 892 1,926 1,468
Recorded investment, with related allowance 6,440 7,923 6,440 7,923 7,791
Recorded Investment 7,332 9,849 7,332 9,849 9,259
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 930 2,044 930 2,044 1,555
Unpaid principal balance with related allowance 6,949 8,231 6,949 8,231 8,216
Unpaid Principal Balance 7,879 10,275 7,879 10,275 9,771
Related Allowance 1,275 1,890 1,275 1,890 1,696
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 921 1,865 997 2,146 2,037
Average recorded investment, with related allowance 6,465 7,682 6,918 7,345 7,471
Average Recorded Investment 7,386 9,547 7,915 9,491 9,508
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 8 8 22 25 32
Recognized interest income, with related allowance 1 0 1 0 5
Recognized Interest Income 9 8 23 25 37
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 10,664 9,019 10,664 9,019 9,136
Recorded investment, with related allowance 2,782 1,909 2,782 1,909 1,768
Recorded Investment 13,446 10,928 13,446 10,928 10,904
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 12,305 10,201 12,305 10,201 10,317
Unpaid principal balance with related allowance 3,121 2,085 3,121 2,085 1,998
Unpaid Principal Balance 15,426 12,286 15,426 12,286 12,315
Related Allowance 337 238 337 238 335
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 10,487 9,200 9,877 9,515 9,427
Average recorded investment, with related allowance 2,858 2,108 2,306 2,054 1,982
Average Recorded Investment 13,345 11,308 12,183 11,569 11,409
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 63 71 202 222 289
Recognized interest income, with related allowance 25 22 61 70 53
Recognized Interest Income 88 93 263 292 342
Home equity line of credit          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 827 1,068 827 1,068 972
Recorded investment, with related allowance 571 100 571 100 120
Recorded Investment 1,398 1,168 1,398 1,168 1,092
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 883 1,128 883 1,128 1,035
Unpaid principal balance with related allowance 590 100 590 100 124
Unpaid Principal Balance 1,473 1,228 1,473 1,228 1,159
Related Allowance 184 7 184 7 17
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 917 1,033 965 1,014 1,001
Average recorded investment, with related allowance 248 100 99 92 99
Average Recorded Investment 1,165 1,133 1,064 1,106 1,100
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 6 6 16 15 20
Recognized interest income, with related allowance 0 0 0 0 0
Recognized Interest Income 6 6 16 15 20
Consumer          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 0 0 0 0 15
Recorded investment, with related allowance 6 2 6 2 0
Recorded Investment 6 2 6 2 15
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 0 0 0 0 42
Unpaid principal balance with related allowance 6 15 6 15 0
Unpaid Principal Balance 6 15 6 15 42
Related Allowance 6 2 6 2 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 0 10 0 14 13
Average recorded investment, with related allowance 2 1 1 0 0
Average Recorded Investment 2 11 1 14 13
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