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Loans - Impaired Loans by Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance $ 11,947 $ 17,836 $ 12,098
Recorded investment, with related allowance 4,393 4,657 3,941
Recorded Investment 16,340 22,493 16,039
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 13,640 19,975 13,806
Unpaid principal balance with related allowance 4,473 4,801 4,036
Unpaid Principal Balance 18,113 24,776 17,842
Related Allowance 900 992 462
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 11,985 17,867 15,473
Average recorded investment, with related allowance 4,139 8,716 5,615
Average Recorded Investment 16,124 26,583 21,088
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized interest income, with no related allowance 57 121 336
Recognized interest income, with related allowance 31 31 142
Recognized Interest Income 88 152 478
Commercial |    Real estate      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 2,223 5,162 2,060
Recorded investment, with related allowance 978 1,061 969
Recorded Investment 3,201 6,223 3,029
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 2,550 5,421 2,368
Unpaid principal balance with related allowance 1,013 1,082 995
Unpaid Principal Balance 3,563 6,503 3,363
Related Allowance 174 230 112
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 2,179 5,157 4,123
Average recorded investment, with related allowance 968 1,064 1,018
Average Recorded Investment 3,147 6,221 5,141
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized interest income, with no related allowance 17 47 127
Recognized interest income, with related allowance 9 8 43
Recognized Interest Income 26 55 170
Commercial |    Construction      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 89 246 89
Recorded investment, with related allowance 681 701 681
Recorded Investment 770 947 770
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 89 265 89
Unpaid principal balance with related allowance 681 701 681
Unpaid Principal Balance 770 966 770
Related Allowance 21 3 18
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 89 717 358
Average recorded investment, with related allowance 681 234 579
Average Recorded Investment 770 951 937
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized interest income, with no related allowance 0 0 0
Recognized interest income, with related allowance 6 10 30
Recognized Interest Income 6 10 30
Commercial |    Other      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 1,593 818 1,591
Recorded investment, with related allowance 627 172 188
Recorded Investment 2,220 990 1,779
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 1,650 848 1,623
Unpaid principal balance with related allowance 643 194 202
Unpaid Principal Balance 2,293 1,042 1,825
Related Allowance 563 172 169
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 1,654 793 999
Average recorded investment, with related allowance 525 4,269 1,193
Average Recorded Investment 2,179 5,062 2,192
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized interest income, with no related allowance 5 3 15
Recognized interest income, with related allowance 0 0 3
Recognized Interest Income 5 3 18
Municipal      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 0 0 0
Recorded investment, with related allowance 0 0 0
Recorded Investment 0 0 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with 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, with 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, with 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, with no related allowance 0 0 0
Recorded investment, with related allowance 0 0 0
Recorded Investment 0 0 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with 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, with 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, with 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, with no related allowance 7,183 10,378 7,335
Recorded investment, with related allowance 2,084 1,660 2,079
Recorded Investment 9,267 12,038 9,414
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 8,416 12,135 8,629
Unpaid principal balance with related allowance 2,113 1,755 2,134
Unpaid Principal Balance 10,529 13,890 10,763
Related Allowance 142 233 163
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 7,184 10,015 8,773
Average recorded investment, with related allowance 1,957 1,999 2,073
Average Recorded Investment 9,141 12,014 10,846
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized interest income, with no related allowance 35 67 193
Recognized interest income, with related allowance 16 13 65
Recognized Interest Income 51 80 258
Home equity line of credit      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 852 1,232 1,015
Recorded investment, with related allowance 23 996 24
Recorded Investment 875 2,228 1,039
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 928 1,306 1,089
Unpaid principal balance with related allowance 23 1,002 24
Unpaid Principal Balance 951 2,308 1,113
Related Allowance 0 296 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 872 1,185 1,219
Average recorded investment, with related allowance 8 1,124 744
Average Recorded Investment 880 2,309 1,963
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized interest income, with no related allowance 0 4 0
Recognized interest income, with related allowance 0 0 1
Recognized Interest Income 0 4 1
Consumer      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 7 0 8
Recorded investment, with related allowance 0 67 0
Recorded Investment 7 67 8
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 7 0 8
Unpaid principal balance with related allowance 0 67 0
Unpaid Principal Balance 7 67 8
Related Allowance 0 58 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 7 0 1
Average recorded investment, with related allowance 0 26 8
Average Recorded Investment 7 26 9
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized interest income, with no related allowance 0 0 1
Recognized interest income, with related allowance 0 0 0
Recognized Interest Income $ 0 $ 0 $ 1