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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

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