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Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | $ 12,098 | $ 18,212 | $ 21,030
Recorded Investment, With Related Allowance | 3,941 | 11,062 | 10,721
Balance of impaired loans | 16,039 | 29,274 | 31,751
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 13,806 | 20,330 | 22,831
Unpaid Principal Balance, With Related Allowance | 4,036 | 11,848 | 11,397
Unpaid Principal Balance | 17,842 | 32,178 | 34,228
Related Allowance | 462 | 2,213 | 2,308
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 15,473 | 20,542 | 18,776
Average Recorded Investment, With Related Allowance | 5,615 | 11,015 | 13,029
Average Recorded Investment | 21,088 | 31,557 | 31,805
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 336 | 593 | 764
Recognized Interest Income, With Related Allowance | 142 | 142 | 100
Recognized Interest Income | 478 | 735 | 864
Commercial | Real estate |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 2,060 | 5,235 | 8,718
Recorded Investment, With Related Allowance | 969 | 1,074 | 1,042
Balance of impaired loans | 3,029 | 6,309 | 9,760
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 2,368 | 5,492 | 9,161
Unpaid Principal Balance, With Related Allowance | 995 | 1,093 | 1,059
Unpaid Principal Balance | 3,363 | 6,585 | 10,220
Related Allowance | 112 | 251 | 260
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 4,123 | 7,611 | 5,536
Average Recorded Investment, With Related Allowance | 1,018 | 1,528 | 3,477
Average Recorded Investment | 5,141 | 9,139 | 9,013
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 127 | 228 | 380
Recognized Interest Income, With Related Allowance | 43 | 60 | 42
Recognized Interest Income | 170 | 288 | 422
Commercial | Construction |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 89 | 958 | 721
Recorded Investment, With Related Allowance | 681 | 0 | 0
Balance of impaired loans | 770 | 958 | 721
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 89 | 970 | 721
Unpaid Principal Balance, With Related Allowance | 681 | 0 | 0
Unpaid Principal Balance | 770 | 970 | 721
Related Allowance | 18 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 358 | 936 | 762
Average Recorded Investment, With Related Allowance | 579 | 0 | 0
Average Recorded Investment | 937 | 936 | 762
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 0 | 47 | 43
Recognized Interest Income, With Related Allowance | 30 | 0 | 0
Recognized Interest Income | 30 | 47 | 43
Commercial | Other |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 1,591 | 756 | 1,468
Recorded Investment, With Related Allowance | 188 | 6,319 | 7,791
Balance of impaired loans | 1,779 | 7,075 | 9,259
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 1,623 | 786 | 1,555
Unpaid Principal Balance, With Related Allowance | 202 | 6,925 | 8,216
Unpaid Principal Balance | 1,825 | 7,711 | 9,771
Related Allowance | 169 | 1,273 | 1,696
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 999 | 965 | 2,037
Average Recorded Investment, With Related Allowance | 1,193 | 6,778 | 7,471
Average Recorded Investment | 2,192 | 7,743 | 9,508
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 15 | 29 | 32
Recognized Interest Income, With Related Allowance | 3 | 0 | 5
Recognized Interest Income | 18 | 29 | 37
Municipal |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 0 | 0 | 0
Recorded Investment, With Related Allowance | 0 | 0 | 0
Balance of impaired loans | 0 | 0 | 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, 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, 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, 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, No Related Allowance | 0 | 0 | 0
Recorded Investment, With Related Allowance | 0 | 0 | 0
Balance of impaired loans | 0 | 0 | 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, 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, 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, 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, No Related Allowance | 7,335 | 10,176 | 9,136
Recorded Investment, With Related Allowance | 2,079 | 2,263 | 1,768
Balance of impaired loans | 9,414 | 12,439 | 10,904
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 8,629 | 11,931 | 10,317
Unpaid Principal Balance, With Related Allowance | 2,134 | 2,412 | 1,998
Unpaid Principal Balance | 10,763 | 14,343 | 12,315
Related Allowance | 163 | 237 | 335
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 8,773 | 10,033 | 9,427
Average Recorded Investment, With Related Allowance | 2,073 | 2,424 | 1,982
Average Recorded Investment | 10,846 | 12,457 | 11,409
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 193 | 269 | 289
Recognized Interest Income, With Related Allowance | 65 | 82 | 53
Recognized Interest Income | 258 | 351 | 342
Home equity line of credit |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 1,015 | 1,087 | 972
Recorded Investment, With Related Allowance | 24 | 1,401 | 120
Balance of impaired loans | 1,039 | 2,488 | 1,092
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 1,089 | 1,151 | 1,035
Unpaid Principal Balance, With Related Allowance | 24 | 1,412 | 124
Unpaid Principal Balance | 1,113 | 2,563 | 1,159
Related Allowance | 0 | 447 | 17
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 1,219 | 997 | 1,001
Average Recorded Investment, With Related Allowance | 744 | 283 | 99
Average Recorded Investment | 1,963 | 1,280 | 1,100
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 0 | 20 | 20
Recognized Interest Income, With Related Allowance | 1 | 0 | 0
Recognized Interest Income | 1 | 20 | 20
Consumer |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 8 | 0 | 15
Recorded Investment, With Related Allowance | 0 | 5 | 0
Balance of impaired loans | 8 | 5 | 15
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 8 | 0 | 42
Unpaid Principal Balance, With Related Allowance | 0 | 6 | 0
Unpaid Principal Balance | 8 | 6 | 42
Related Allowance | 0 | 5 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 1 | 0 | 13
Average Recorded Investment, With Related Allowance | 8 | 2 | 0
Average Recorded Investment | 9 | 2 | 13
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 1 | 0 | 0
Recognized Interest Income, With Related Allowance | 0 | 0 | 0
Recognized Interest Income | $ 1 | $ 0 | $ 0

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