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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