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Loans - Impaired Loans by Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance $ 8,041 $ 11,947 $ 8,968
Recorded investment, with related allowance 3,213 4,393 3,084
Recorded Investment 11,254 16,340 12,052
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 9,529 13,640 10,453
Unpaid principal balance with related allowance 3,371 4,473 3,307
Unpaid Principal Balance 12,900 18,113 13,760
Related Allowance 712 900 576
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 8,177 11,985 9,553
Average recorded investment, with related allowance 3,265 4,139 3,568
Average Recorded Investment 11,442 16,124 13,121
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized interest income, with no related allowance 40 57 166
Recognized interest income, with related allowance 18 31 76
Recognized Interest Income 58 88 242
Commercial |    Real estate      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 1,733 2,223 1,386
Recorded investment, with related allowance 42 978 42
Recorded Investment 1,775 3,201 1,428
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 2,039 2,550 1,689
Unpaid principal balance with related allowance 71 1,013 71
Unpaid Principal Balance 2,110 3,563 1,760
Related Allowance 42 174 42
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 1,577 2,179 1,590
Average recorded investment, with related allowance 42 968 614
Average Recorded Investment 1,619 3,147 2,204
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized interest income, with no related allowance 13 17 63
Recognized interest income, with related allowance 0 9 0
Recognized Interest Income 13 26 63
Commercial |    Construction      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 27 89 28
Recorded investment, with related allowance 661 681 661
Recorded Investment 688 770 689
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 28 89 28
Unpaid principal balance with related allowance 661 681 661
Unpaid Principal Balance 689 770 689
Related Allowance 13 21 16
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 27 89 22
Average recorded investment, with related allowance 661 681 661
Average Recorded Investment 688 770 683
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 6 22
Recognized Interest Income 6 6 22
Commercial |    Other      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 452 1,593 917
Recorded investment, with related allowance 781 627 386
Recorded Investment 1,233 2,220 1,303
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 503 1,650 1,009
Unpaid principal balance with related allowance 865 643 411
Unpaid Principal Balance 1,368 2,293 1,420
Related Allowance 532 563 381
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 458 1,654 1,051
Average recorded investment, with related allowance 794 525 396
Average Recorded Investment 1,252 2,179 1,447
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized interest income, with no related allowance 4 5 15
Recognized interest income, with related allowance 0 0 0
Recognized Interest Income 4 5 15
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 5,637 7,183 6,178
Recorded investment, with related allowance 1,629 2,084 1,995
Recorded Investment 7,266 9,267 8,173
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 6,741 8,416 7,238
Unpaid principal balance with related allowance 1,674 2,113 2,164
Unpaid Principal Balance 8,415 10,529 9,402
Related Allowance 118 142 137
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 5,793 7,184 6,429
Average recorded investment, with related allowance 1,735 1,957 1,897
Average Recorded Investment 7,528 9,141 8,326
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized interest income, with no related allowance 23 35 87
Recognized interest income, with related allowance 12 16 54
Recognized Interest Income 35 51 141
Home equity line of credit      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 191 852 457
Recorded investment, with related allowance 100 23 0
Recorded Investment 291 875 457
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 217 928 487
Unpaid principal balance with related allowance 100 23 0
Unpaid Principal Balance 317 951 487
Related Allowance 7 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 320 872 461
Average recorded investment, with related allowance 33 8 0
Average Recorded Investment 353 880 461
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
Consumer      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 1 7 2
Recorded investment, with related allowance 0 0 0
Recorded Investment 1 7 2
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 1 7 2
Unpaid principal balance with related allowance 0 0 0
Unpaid Principal Balance 1 7 2
Related Allowance 0 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 2 7 0
Average recorded investment, with related allowance 0 0 0
Average Recorded Investment 2 7 0
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