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Loans - Impaired Loans by Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance $ 11,904 $ 15,295 $ 11,904 $ 15,295 $ 12,098
Recorded investment, with related allowance 3,674 4,718 3,674 4,718 3,941
Recorded Investment 15,578 20,013 15,578 20,013 16,039
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 13,617 16,989 13,617 16,989 13,806
Unpaid principal balance with related allowance 3,760 4,789 3,760 4,789 4,036
Unpaid Principal Balance 17,377 21,778 17,377 21,778 17,842
Related Allowance 707 917 707 917 462
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 12,166 16,515 12,080 17,190 15,473
Average recorded investment, with related allowance 3,768 4,618 3,954 6,668 5,615
Average Recorded Investment 15,934 21,133 16,034 23,858 21,088
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 54 76 111 197 336
Recognized interest income, with related allowance 28 43 59 74 142
Recognized Interest Income 82 119 170 271 478
Commercial |    Real estate          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 2,145 4,757 2,145 4,757 2,060
Recorded investment, with related allowance 929 992 929 992 969
Recorded Investment 3,074 5,749 3,074 5,749 3,029
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 2,490 5,013 2,490 5,013 2,368
Unpaid principal balance with related allowance 956 1,015 956 1,015 995
Unpaid Principal Balance 3,446 6,028 3,446 6,028 3,363
Related Allowance 167 199 167 199 112
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 2,412 4,794 2,295 4,975 4,123
Average recorded investment, with related allowance 939 1,004 954 1,034 1,018
Average Recorded Investment 3,351 5,798 3,249 6,009 5,141
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 18 37 35 84 127
Recognized interest income, with related allowance 11 13 20 21 43
Recognized Interest Income 29 50 55 105 170
Commercial |    Construction          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 106 233 106 233 89
Recorded investment, with related allowance 681 701 681 701 681
Recorded Investment 787 934 787 934 770
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 106 257 106 257 89
Unpaid principal balance with related allowance 681 701 681 701 681
Unpaid Principal Balance 787 958 787 958 770
Related Allowance 19 20 19 20 18
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 94 234 92 475 358
Average recorded investment, with related allowance 681 701 681 468 579
Average Recorded Investment 775 935 773 943 937
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 5 7 11 17 30
Recognized Interest Income 5 7 11 17 30
Commercial |    Other          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 1,567 713 1,567 713 1,591
Recorded investment, with related allowance 422 140 422 140 188
Recorded Investment 1,989 853 1,989 853 1,779
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 1,638 737 1,638 737 1,623
Unpaid principal balance with related allowance 439 159 439 159 202
Unpaid Principal Balance 2,077 896 2,077 896 1,825
Related Allowance 403 132 403 132 169
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 1,575 781 1,615 787 999
Average recorded investment, with related allowance 471 157 498 2,213 1,193
Average Recorded Investment 2,046 938 2,113 3,000 2,192
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 3 10 8 13 15
Recognized interest income, with related allowance 5 0 5 0 3
Recognized Interest Income 8 10 13 13 18
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 7,506 8,293 7,506 8,293 7,335
Recorded investment, with related allowance 1,620 2,018 1,620 2,018 2,079
Recorded Investment 9,126 10,311 9,126 10,311 9,414
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 8,770 9,620 8,770 9,620 8,629
Unpaid principal balance with related allowance 1,662 2,047 1,662 2,047 2,134
Unpaid Principal Balance 10,432 11,667 10,432 11,667 10,763
Related Allowance 118 269 118 269 163
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 7,329 9,478 7,256 9,746 8,773
Average recorded investment, with related allowance 1,662 1,800 1,810 1,900 2,073
Average Recorded Investment 8,991 11,278 9,066 11,646 10,846
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 33 25 68 92 193
Recognized interest income, with related allowance 7 23 23 36 65
Recognized Interest Income 40 48 91 128 258
Home equity line of credit          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 574 1,299 574 1,299 1,015
Recorded investment, with related allowance 22 862 22 862 24
Recorded Investment 596 2,161 596 2,161 1,039
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 607 1,362 607 1,362 1,089
Unpaid principal balance with related allowance 22 862 22 862 24
Unpaid Principal Balance 629 2,224 629 2,224 1,113
Related Allowance 0 292 0 292 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 756 1,228 815 1,207 1,219
Average recorded investment, with related allowance 15 951 11 1,038 744
Average Recorded Investment 771 2,179 826 2,245 1,963
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 0 4 0 8 0
Recognized interest income, with related allowance 0 0 0 0 1
Recognized Interest Income 0 4 0 8 1
Consumer          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 6 0 6 0 8
Recorded investment, with related allowance 0 5 0 5 0
Recorded Investment 6 5 6 5 8
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 6 0 6 0 8
Unpaid principal balance with related allowance 0 5 0 5 0
Unpaid Principal Balance 6 5 6 5 8
Related Allowance 0 5 0 5 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 0 0 7 0 1
Average recorded investment, with related allowance 0 5 0 15 8
Average Recorded Investment 0 5 7 15 9
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 0 0 0 0 1
Recognized interest income, with related allowance 0 0 0 0 0
Recognized Interest Income $ 0 $ 0 $ 0 $ 0 $ 1