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Loans - Impaired Loans by Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance $ 14,161 $ 20,693 $ 14,161 $ 20,693 $ 18,212
Recorded investment, with related allowance 5,180 11,516 5,180 11,516 11,062
Recorded Investment 19,341 32,209 19,341 32,209 29,274
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 16,361 22,738 16,361 22,738 20,330
Unpaid principal balance with related allowance 5,293 12,398 5,293 12,398 11,848
Unpaid Principal Balance 21,654 35,136 21,654 35,136 32,178
Related Allowance 890 2,060 890 2,060 2,213
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 14,600 20,547 16,328 20,697 20,542
Average recorded investment, with related allowance 4,951 11,294 6,094 10,862 11,015
Average Recorded Investment 19,551 31,841 22,422 31,559 31,557
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 72 172 269 541 593
Recognized interest income, with related allowance 47 49 121 134 142
Recognized Interest Income 119 221 390 675 735
Commercial |    Real estate          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 3,730 7,332 3,730 7,332 5,235
Recorded investment, with related allowance 1,023 1,717 1,023 1,717 1,074
Recorded Investment 4,753 9,049 4,753 9,049 6,309
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 4,528 7,630 4,528 7,630 5,492
Unpaid principal balance with related allowance 1,047 1,732 1,047 1,732 1,093
Unpaid Principal Balance 5,575 9,362 5,575 9,362 6,585
Related Allowance 135 258 135 258 251
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 4,068 7,242 4,673 7,929 7,611
Average recorded investment, with related allowance 1,027 1,721 1,032 1,538 1,528
Average Recorded Investment 5,095 8,963 5,705 9,467 9,139
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 33 83 117 266 228
Recognized interest income, with related allowance 11 23 32 72 60
Recognized Interest Income 44 106 149 338 288
Commercial |    Construction          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 308 978 308 978 958
Recorded investment, with related allowance 701 0 701 0 0
Recorded Investment 1,009 978 1,009 978 958
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 337 990 337 990 970
Unpaid principal balance with related allowance 701 0 701 0 0
Unpaid Principal Balance 1,038 990 1,038 990 970
Related Allowance 19 0 19 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 256 980 402 929 936
Average recorded investment, with related allowance 701 0 546 0 0
Average Recorded Investment 957 980 948 929 936
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 0 12 0 35 47
Recognized interest income, with related allowance 8 0 25 0 0
Recognized Interest Income 8 12 25 35 47
Commercial |    Other          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 862 892 862 892 756
Recorded investment, with related allowance 161 6,440 161 6,440 6,319
Recorded Investment 1,023 7,332 1,023 7,332 7,075
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 887 930 887 930 786
Unpaid principal balance with related allowance 183 6,949 183 6,949 6,925
Unpaid Principal Balance 1,070 7,879 1,070 7,879 7,711
Related Allowance 128 1,275 128 1,275 1,273
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 814 921 796 997 965
Average recorded investment, with related allowance 143 6,465 1,523 6,918 6,778
Average Recorded Investment 957 7,386 2,319 7,915 7,743
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 6 8 19 22 29
Recognized interest income, with related allowance 0 1 0 1 0
Recognized Interest Income 6 9 19 23 29
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 7,783 10,664 7,783 10,664 10,176
Recorded investment, with related allowance 2,399 2,782 2,399 2,782 2,263
Recorded Investment 10,182 13,446 10,182 13,446 12,439
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 9,058 12,305 9,058 12,305 11,931
Unpaid principal balance with related allowance 2,466 3,121 2,466 3,121 2,412
Unpaid Principal Balance 11,524 15,426 11,524 15,426 14,343
Related Allowance 204 337 204 337 237
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 8,024 10,487 9,173 9,877 10,033
Average recorded investment, with related allowance 2,207 2,858 2,002 2,306 2,424
Average Recorded Investment 10,231 13,345 11,175 12,183 12,457
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 31 63 123 202 269
Recognized interest income, with related allowance 27 25 63 61 82
Recognized Interest Income 58 88 186 263 351
Home equity line of credit          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 1,478 827 1,478 827 1,087
Recorded investment, with related allowance 886 571 886 571 1,401
Recorded Investment 2,364 1,398 2,364 1,398 2,488
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 1,551 883 1,551 883 1,151
Unpaid principal balance with related allowance 886 590 886 590 1,412
Unpaid Principal Balance 2,437 1,473 2,437 1,473 2,563
Related Allowance 403 184 403 184 447
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 1,438 917 1,284 965 997
Average recorded investment, with related allowance 870 248 981 99 283
Average Recorded Investment 2,308 1,165 2,265 1,064 1,280
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 2 6 10 16 20
Recognized interest income, with related allowance 1 0 1 0 0
Recognized Interest Income 3 6 11 16 20
Consumer          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 0 0 0 0 0
Recorded investment, with related allowance 10 6 10 6 5
Recorded Investment 10 6 10 6 5
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 10 6 10 6 6
Unpaid Principal Balance 10 6 10 6 6
Related Allowance 1 6 1 6 5
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 3 2 10 1 2
Average Recorded Investment 3 2 10 1 2
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