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Loans - Impaired Loans by Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance $ 10,790 $ 14,161 $ 10,790 $ 14,161 $ 12,098
Recorded investment, with related allowance 3,759 5,180 3,759 5,180 3,941
Recorded Investment 14,549 19,341 14,549 19,341 16,039
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 12,442 16,361 12,442 16,361 13,806
Unpaid principal balance with related allowance 3,969 5,293 3,969 5,293 4,036
Unpaid Principal Balance 16,411 21,654 16,411 21,654 17,842
Related Allowance 682 890 682 890 462
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 11,179 14,600 11,789 16,328 15,473
Average recorded investment, with related allowance 3,659 4,951 3,856 6,094 5,615
Average Recorded Investment 14,838 19,551 15,645 22,422 21,088
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 52 72 163 269 336
Recognized interest income, with related allowance 30 47 89 121 142
Recognized Interest Income 82 119 252 390 478
Commercial |    Real estate          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 1,906 3,730 1,906 3,730 2,060
Recorded investment, with related allowance 894 1,023 894 1,023 969
Recorded Investment 2,800 4,753 2,800 4,753 3,029
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 2,257 4,528 2,257 4,528 2,368
Unpaid principal balance with related allowance 923 1,047 923 1,047 995
Unpaid Principal Balance 3,180 5,575 3,180 5,575 3,363
Related Allowance 138 135 138 135 112
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 2,053 4,068 2,215 4,673 4,123
Average recorded investment, with related allowance 910 1,027 940 1,032 1,018
Average Recorded Investment 2,963 5,095 3,155 5,705 5,141
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 15 33 50 117 127
Recognized interest income, with related allowance 10 11 30 32 43
Recognized Interest Income 25 44 80 149 170
Commercial |    Construction          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 24 308 24 308 89
Recorded investment, with related allowance 681 701 681 701 681
Recorded Investment 705 1,009 705 1,009 770
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 25 337 25 337 89
Unpaid principal balance with related allowance 681 701 681 701 681
Unpaid Principal Balance 706 1,038 706 1,038 770
Related Allowance 18 19 18 19 18
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 24 256 69 402 358
Average recorded investment, with related allowance 681 701 681 546 579
Average Recorded Investment 705 957 750 948 937
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 6 8 17 25 30
Recognized Interest Income 6 8 17 25 30
Commercial |    Other          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 1,353 862 1,353 862 1,591
Recorded investment, with related allowance 402 161 402 161 188
Recorded Investment 1,755 1,023 1,755 1,023 1,779
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 1,459 887 1,459 887 1,623
Unpaid principal balance with related allowance 421 183 421 183 202
Unpaid Principal Balance 1,880 1,070 1,880 1,070 1,825
Related Allowance 397 128 397 128 169
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 1,372 814 1,534 796 999
Average recorded investment, with related allowance 403 143 466 1,523 1,193
Average Recorded Investment 1,775 957 2,000 2,319 2,192
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 4 6 12 19 15
Recognized interest income, with related allowance 5 0 10 0 3
Recognized Interest Income 9 6 22 19 18
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 9 0 0
Average recorded investment, with related allowance 0 0 0 0 0
Average Recorded Investment 0 0 9 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 7,021 7,783 7,021 7,783 7,335
Recorded investment, with related allowance 1,761 2,399 1,761 2,399 2,079
Recorded Investment 8,782 10,182 8,782 10,182 9,414
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 8,181 9,058 8,181 9,058 8,629
Unpaid principal balance with related allowance 1,923 2,466 1,923 2,466 2,134
Unpaid Principal Balance 10,104 11,524 10,104 11,524 10,763
Related Allowance 129 204 129 204 163
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 7,180 8,024 7,231 9,173 8,773
Average recorded investment, with related allowance 1,641 2,207 1,753 2,002 2,073
Average Recorded Investment 8,821 10,231 8,984 11,175 10,846
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 33 31 101 123 193
Recognized interest income, with related allowance 9 27 32 63 65
Recognized Interest Income 42 58 133 186 258
Home equity line of credit          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 482 1,478 482 1,478 1,015
Recorded investment, with related allowance 21 886 21 886 24
Recorded Investment 503 2,364 503 2,364 1,039
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 516 1,551 516 1,551 1,089
Unpaid principal balance with related allowance 21 886 21 886 24
Unpaid Principal Balance 537 2,437 537 2,437 1,113
Related Allowance 0 403 0 403 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 546 1,438 725 1,284 1,219
Average recorded investment, with related allowance 21 870 15 981 744
Average Recorded Investment 567 2,308 740 2,265 1,963
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 0 2 0 10 0
Recognized interest income, with related allowance 0 1 0 1 1
Recognized Interest Income 0 3 0 11 1
Consumer          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 4 0 4 0 8
Recorded investment, with related allowance 0 10 0 10 0
Recorded Investment 4 10 4 10 8
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 4 0 4 0 8
Unpaid principal balance with related allowance 0 10 0 10 0
Unpaid Principal Balance 4 10 4 10 8
Related Allowance 0 1 0 1 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 4 0 6 0 1
Average recorded investment, with related allowance 3 3 1 10 8
Average Recorded Investment 7 3 7 10 9
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 0 0 0 0 1
Recognized interest income, with related allowance 0 0 0 0 0
Recognized Interest Income $ 0 $ 0 $ 0 $ 0 $ 1