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Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | $ 15,295 | $ 20,165 | $ 15,295 | $ 20,165 | $ 18,212
Recorded investment, with related allowance | 4,718 | 11,015 | 4,718 | 11,015 | 11,062
Recorded Investment | 20,013 | 31,180 | 20,013 | 31,180 | 29,274
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 16,989 | 22,232 | 16,989 | 22,232 | 20,330
Unpaid principal balance with related allowance | 4,789 | 11,601 | 4,789 | 11,601 | 11,848
Unpaid Principal Balance | 21,778 | 33,833 | 21,778 | 33,833 | 32,178
Related Allowance | 917 | 1,830 | 917 | 1,830 | 2,213
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 16,515 | 20,795 | 17,190 | 20,770 | 20,542
Average recorded investment, with related allowance | 4,618 | 10,693 | 6,668 | 10,646 | 11,015
Average Recorded Investment | 21,133 | 31,488 | 23,858 | 31,416 | 31,557
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 76 | 188 | 197 | 369 | 593
Recognized interest income, with related allowance | 43 | 42 | 74 | 85 | 142
Recognized Interest Income | 119 | 230 | 271 | 454 | 735
Commercial | Real estate |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 4,757 | 7,230 | 4,757 | 7,230 | 5,235
Recorded investment, with related allowance | 992 | 1,731 | 992 | 1,731 | 1,074
Recorded Investment | 5,749 | 8,961 | 5,749 | 8,961 | 6,309
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 5,013 | 7,510 | 5,013 | 7,510 | 5,492
Unpaid principal balance with related allowance | 1,015 | 1,742 | 1,015 | 1,742 | 1,093
Unpaid Principal Balance | 6,028 | 9,252 | 6,028 | 9,252 | 6,585
Related Allowance | 199 | 196 | 199 | 196 | 251
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 4,794 | 7,805 | 4,975 | 8,273 | 7,611
Average recorded investment, with related allowance | 1,004 | 1,677 | 1,034 | 1,446 | 1,528
Average Recorded Investment | 5,798 | 9,482 | 6,009 | 9,719 | 9,139
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 37 | 93 | 84 | 183 | 228
Recognized interest income, with related allowance | 13 | 23 | 21 | 49 | 60
Recognized Interest Income | 50 | 116 | 105 | 232 | 288
Commercial | Construction |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 233 | 982 | 233 | 982 | 958
Recorded investment, with related allowance | 701 | 0 | 701 | 0 | 0
Recorded Investment | 934 | 982 | 934 | 982 | 958
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 257 | 990 | 257 | 990 | 970
Unpaid principal balance with related allowance | 701 | 0 | 701 | 0 | 0
Unpaid Principal Balance | 958 | 990 | 958 | 990 | 970
Related Allowance | 20 | 0 | 20 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 234 | 990 | 475 | 903 | 936
Average recorded investment, with related allowance | 701 | 0 | 468 | 0 | 0
Average Recorded Investment | 935 | 990 | 943 | 903 | 936
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 0 | 11 | 0 | 23 | 47
Recognized interest income, with related allowance | 7 | 0 | 17 | 0 | 0
Recognized Interest Income | 7 | 11 | 17 | 23 | 47
Commercial | Other |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 713 | 949 | 713 | 949 | 756
Recorded investment, with related allowance | 140 | 6,633 | 140 | 6,633 | 6,319
Recorded Investment | 853 | 7,582 | 853 | 7,582 | 7,075
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 737 | 978 | 737 | 978 | 786
Unpaid principal balance with related allowance | 159 | 7,022 | 159 | 7,022 | 6,925
Unpaid Principal Balance | 896 | 8,000 | 896 | 8,000 | 7,711
Related Allowance | 132 | 1,320 | 132 | 1,320 | 1,273
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 781 | 862 | 787 | 1,034 | 965
Average recorded investment, with related allowance | 157 | 6,778 | 2,213 | 7,144 | 6,778
Average Recorded Investment | 938 | 7,640 | 3,000 | 8,178 | 7,743
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 10 | 8 | 13 | 14 | 29
Recognized interest income, with related allowance | 0 | 0 | 0 | 0 | 0
Recognized Interest Income | 10 | 8 | 13 | 14 | 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 | 8,293 | 10,004 | 8,293 | 10,004 | 10,176
Recorded investment, with related allowance | 2,018 | 2,632 | 2,018 | 2,632 | 2,263
Recorded Investment | 10,311 | 12,636 | 10,311 | 12,636 | 12,439
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 9,620 | 11,689 | 9,620 | 11,689 | 11,931
Unpaid principal balance with related allowance | 2,047 | 2,813 | 2,047 | 2,813 | 2,412
Unpaid Principal Balance | 11,667 | 14,502 | 11,667 | 14,502 | 14,343
Related Allowance | 269 | 305 | 269 | 305 | 237
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 9,478 | 10,136 | 9,746 | 9,571 | 10,033
Average recorded investment, with related allowance | 1,800 | 2,217 | 1,900 | 2,031 | 2,424
Average Recorded Investment | 11,278 | 12,353 | 11,646 | 11,602 | 12,457
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 25 | 71 | 92 | 139 | 269
Recognized interest income, with related allowance | 23 | 19 | 36 | 36 | 82
Recognized Interest Income | 48 | 90 | 128 | 175 | 351
Home equity line of credit |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 1,299 | 1,000 | 1,299 | 1,000 | 1,087
Recorded investment, with related allowance | 862 | 19 | 862 | 19 | 1,401
Recorded Investment | 2,161 | 1,019 | 2,161 | 1,019 | 2,488
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Unpaid principal balance, with no related allowance | 1,362 | 1,065 | 1,362 | 1,065 | 1,151
Unpaid principal balance with related allowance | 862 | 24 | 862 | 24 | 1,412
Unpaid Principal Balance | 2,224 | 1,089 | 2,224 | 1,089 | 2,563
Related Allowance | 292 | 9 | 292 | 9 | 447
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Average recorded investment, with no related allowance | 1,228 | 1,002 | 1,207 | 989 | 997
Average recorded investment, with related allowance | 951 | 20 | 1,038 | 24 | 283
Average Recorded Investment | 2,179 | 1,022 | 2,245 | 1,013 | 1,280
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Recognized interest income, with no related allowance | 4 | 5 | 8 | 10 | 20
Recognized interest income, with related allowance | 0 | 0 | 0 | 0 | 0
Recognized Interest Income | 4 | 5 | 8 | 10 | 20
Consumer |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Recorded investment, with no related allowance | 0 | 0 | 0 | 0 | 0
Recorded investment, with related allowance | 5 | 0 | 5 | 0 | 5
Recorded Investment | 5 | 0 | 5 | 0 | 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 | 5 | 0 | 5 | 0 | 6
Unpaid Principal Balance | 5 | 0 | 5 | 0 | 6
Related Allowance | 5 | 0 | 5 | 0 | 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 | 5 | 1 | 15 | 1 | 2
Average Recorded Investment | 5 | 1 | 15 | 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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