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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

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