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Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded investment, with no related allowance | $ 11,947 | $ 17,836 | $ 12,098
Recorded investment, with related allowance | 4,393 | 4,657 | 3,941
Recorded Investment | 16,340 | 22,493 | 16,039
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid principal balance, with no related allowance | 13,640 | 19,975 | 13,806
Unpaid principal balance with related allowance | 4,473 | 4,801 | 4,036
Unpaid Principal Balance | 18,113 | 24,776 | 17,842
Related Allowance | 900 | 992 | 462
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average recorded investment, with no related allowance | 11,985 | 17,867 | 15,473
Average recorded investment, with related allowance | 4,139 | 8,716 | 5,615
Average Recorded Investment | 16,124 | 26,583 | 21,088
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized interest income, with no related allowance | 57 | 121 | 336
Recognized interest income, with related allowance | 31 | 31 | 142
Recognized Interest Income | 88 | 152 | 478
Commercial | Real estate |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded investment, with no related allowance | 2,223 | 5,162 | 2,060
Recorded investment, with related allowance | 978 | 1,061 | 969
Recorded Investment | 3,201 | 6,223 | 3,029
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid principal balance, with no related allowance | 2,550 | 5,421 | 2,368
Unpaid principal balance with related allowance | 1,013 | 1,082 | 995
Unpaid Principal Balance | 3,563 | 6,503 | 3,363
Related Allowance | 174 | 230 | 112
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average recorded investment, with no related allowance | 2,179 | 5,157 | 4,123
Average recorded investment, with related allowance | 968 | 1,064 | 1,018
Average Recorded Investment | 3,147 | 6,221 | 5,141
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized interest income, with no related allowance | 17 | 47 | 127
Recognized interest income, with related allowance | 9 | 8 | 43
Recognized Interest Income | 26 | 55 | 170
Commercial | Construction |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded investment, with no related allowance | 89 | 246 | 89
Recorded investment, with related allowance | 681 | 701 | 681
Recorded Investment | 770 | 947 | 770
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid principal balance, with no related allowance | 89 | 265 | 89
Unpaid principal balance with related allowance | 681 | 701 | 681
Unpaid Principal Balance | 770 | 966 | 770
Related Allowance | 21 | 3 | 18
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average recorded investment, with no related allowance | 89 | 717 | 358
Average recorded investment, with related allowance | 681 | 234 | 579
Average Recorded Investment | 770 | 951 | 937
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized interest income, with no related allowance | 0 | 0 | 0
Recognized interest income, with related allowance | 6 | 10 | 30
Recognized Interest Income | 6 | 10 | 30
Commercial | Other |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded investment, with no related allowance | 1,593 | 818 | 1,591
Recorded investment, with related allowance | 627 | 172 | 188
Recorded Investment | 2,220 | 990 | 1,779
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid principal balance, with no related allowance | 1,650 | 848 | 1,623
Unpaid principal balance with related allowance | 643 | 194 | 202
Unpaid Principal Balance | 2,293 | 1,042 | 1,825
Related Allowance | 563 | 172 | 169
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average recorded investment, with no related allowance | 1,654 | 793 | 999
Average recorded investment, with related allowance | 525 | 4,269 | 1,193
Average Recorded Investment | 2,179 | 5,062 | 2,192
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized interest income, with no related allowance | 5 | 3 | 15
Recognized interest income, with related allowance | 0 | 0 | 3
Recognized Interest Income | 5 | 3 | 18
Municipal |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded investment, with no related allowance | 0 | 0 | 0
Recorded investment, with related allowance | 0 | 0 | 0
Recorded Investment | 0 | 0 | 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid principal balance, with 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, with 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, with 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, with no related allowance | 0 | 0 | 0
Recorded investment, with related allowance | 0 | 0 | 0
Recorded Investment | 0 | 0 | 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid principal balance, with 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, with 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, with 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, with no related allowance | 7,183 | 10,378 | 7,335
Recorded investment, with related allowance | 2,084 | 1,660 | 2,079
Recorded Investment | 9,267 | 12,038 | 9,414
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid principal balance, with no related allowance | 8,416 | 12,135 | 8,629
Unpaid principal balance with related allowance | 2,113 | 1,755 | 2,134
Unpaid Principal Balance | 10,529 | 13,890 | 10,763
Related Allowance | 142 | 233 | 163
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average recorded investment, with no related allowance | 7,184 | 10,015 | 8,773
Average recorded investment, with related allowance | 1,957 | 1,999 | 2,073
Average Recorded Investment | 9,141 | 12,014 | 10,846
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized interest income, with no related allowance | 35 | 67 | 193
Recognized interest income, with related allowance | 16 | 13 | 65
Recognized Interest Income | 51 | 80 | 258
Home equity line of credit |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded investment, with no related allowance | 852 | 1,232 | 1,015
Recorded investment, with related allowance | 23 | 996 | 24
Recorded Investment | 875 | 2,228 | 1,039
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid principal balance, with no related allowance | 928 | 1,306 | 1,089
Unpaid principal balance with related allowance | 23 | 1,002 | 24
Unpaid Principal Balance | 951 | 2,308 | 1,113
Related Allowance | 0 | 296 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average recorded investment, with no related allowance | 872 | 1,185 | 1,219
Average recorded investment, with related allowance | 8 | 1,124 | 744
Average Recorded Investment | 880 | 2,309 | 1,963
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized interest income, with no related allowance | 0 | 4 | 0
Recognized interest income, with related allowance | 0 | 0 | 1
Recognized Interest Income | 0 | 4 | 1
Consumer |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded investment, with no related allowance | 7 | 0 | 8
Recorded investment, with related allowance | 0 | 67 | 0
Recorded Investment | 7 | 67 | 8
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid principal balance, with no related allowance | 7 | 0 | 8
Unpaid principal balance with related allowance | 0 | 67 | 0
Unpaid Principal Balance | 7 | 67 | 8
Related Allowance | 0 | 58 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average recorded investment, with no related allowance | 7 | 0 | 1
Average recorded investment, with related allowance | 0 | 26 | 8
Average Recorded Investment | 7 | 26 | 9
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized interest income, with no related allowance | 0 | 0 | 1
Recognized interest income, with related allowance | 0 | 0 | 0
Recognized Interest Income | $ 0 | $ 0 | $ 1

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