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Loans - Impaired Loans by Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance $ 3,878 $ 10,790 $ 3,878 $ 10,790 $ 8,968
Recorded investment, with related allowance 2,477 3,759 2,477 3,759 3,084
Recorded Investment 6,355 14,549 6,355 14,549 12,052
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 4,511 12,442 4,511 12,442 10,453
Unpaid principal balance with related allowance 2,575 3,969 2,575 3,969 3,307
Unpaid Principal Balance 7,086 16,411 7,086 16,411 13,760
Related Allowance 420 682 420 682 576
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 6,659 11,179 7,635 11,789 9,553
Average recorded investment, with related allowance 2,724 3,659 2,993 3,856 3,568
Average Recorded Investment 9,383 14,838 10,628 15,645 13,121
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 7 52 92 163 166
Recognized interest income, with related allowance 25 30 61 89 76
Recognized Interest Income 32 82 153 252 242
Commercial |    Real estate          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 1,295 1,906 1,295 1,906 1,386
Recorded investment, with related allowance 0 894 0 894 42
Recorded Investment 1,295 2,800 1,295 2,800 1,428
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 1,607 2,257 1,607 2,257 1,689
Unpaid principal balance with related allowance 0 923 0 923 71
Unpaid Principal Balance 1,607 3,180 1,607 3,180 1,760
Related Allowance 0 138 0 138 42
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 1,314 2,053 1,497 2,215 1,590
Average recorded investment, with related allowance 0 910 14 940 614
Average Recorded Investment 1,314 2,963 1,511 3,155 2,204
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 14 15 42 50 63
Recognized interest income, with related allowance 0 10 0 30 0
Recognized Interest Income 14 25 42 80 63
Commercial |    Construction          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 25 24 25 24 28
Recorded investment, with related allowance 661 681 661 681 661
Recorded Investment 686 705 686 705 689
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 27 25 27 25 28
Unpaid principal balance with related allowance 661 681 661 681 661
Unpaid Principal Balance 688 706 688 706 689
Related Allowance 6 18 6 18 16
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 25 24 26 69 22
Average recorded investment, with related allowance 661 681 661 681 661
Average Recorded Investment 686 705 687 750 683
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 16 6 27 17 22
Recognized Interest Income 16 6 27 17 22
Commercial |    Other          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 399 1,353 399 1,353 917
Recorded investment, with related allowance 552 402 552 402 386
Recorded Investment 951 1,755 951 1,755 1,303
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 459 1,459 459 1,459 1,009
Unpaid principal balance with related allowance 647 421 647 421 411
Unpaid Principal Balance 1,106 1,880 1,106 1,880 1,420
Related Allowance 315 397 315 397 381
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 405 1,372 432 1,534 1,051
Average recorded investment, with related allowance 679 403 745 466 396
Average Recorded Investment 1,084 1,775 1,177 2,000 1,447
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 2 4 10 12 15
Recognized interest income, with related allowance 0 5 0 10 0
Recognized Interest Income 2 9 10 22 15
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 9 0
Average recorded investment, with related allowance 0 0 0 0 0
Average Recorded Investment 0 0 0 9 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 1,912 7,021 1,912 7,021 6,178
Recorded investment, with related allowance 1,264 1,761 1,264 1,761 1,995
Recorded Investment 3,176 8,782 3,176 8,782 8,173
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 2,139 8,181 2,139 8,181 7,238
Unpaid principal balance with related allowance 1,267 1,923 1,267 1,923 2,164
Unpaid Principal Balance 3,406 10,104 3,406 10,104 9,402
Related Allowance 99 129 99 129 137
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 4,666 7,180 5,381 7,231 6,429
Average recorded investment, with related allowance 1,384 1,641 1,562 1,753 1,897
Average Recorded Investment 6,050 8,821 6,942 8,984 8,326
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance (9) 33 40 101 87
Recognized interest income, with related allowance 9 9 34 32 54
Recognized Interest Income 0 42 74 133 141
Home equity line of credit          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 247 482 247 482 457
Recorded investment, with related allowance 0 21 0 21 0
Recorded Investment 247 503 247 503 457
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 279 516 279 516 487
Unpaid principal balance with related allowance 0 21 0 21 0
Unpaid Principal Balance 279 537 279 537 487
Related Allowance 0 0 0 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 249 546 298 725 461
Average recorded investment, with related allowance 0 21 11 15 0
Average Recorded Investment 249 567 310 740 461
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
Consumer          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 0 4 0 4 2
Recorded investment, with related allowance 0 0 0 0 0
Recorded Investment 0 4 0 4 2
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 0 4 0 4 2
Unpaid principal balance with related allowance 0 0 0 0 0
Unpaid Principal Balance 0 4 0 4 2
Related Allowance 0 0 0 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 0 4 1 6 0
Average recorded investment, with related allowance 0 3 0 1 0
Average Recorded Investment 0 7 1 7 0
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