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Allowance for Credit Losses - Loans - Residential and consumer portfolio (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Performing and non-performing outstanding balances of the residential and consumer portfolios |  |  |
Total loans | $ 1,025,687 |  | $ 1,038,271
Current period gross charge-offs, Total | 164 | $ 139 |
Residential mortgage |  |  |
Performing and non-performing outstanding balances of the residential and consumer portfolios |  |  |
Total loans | 176,991 |  | 174,670
Residential and Consumer |  |  |
Performing and non-performing outstanding balances of the residential and consumer portfolios |  |  |
2024/2023 | 4,691 |  | 28,481
2023/2022 | 27,997 |  | 32,050
2022/2021 | 31,079 |  | 70,954
2021/2020 | 69,711 |  | 47,312
2020/2019 | 46,672 |  | 8,303
PRIOR | 50,854 |  | 40,956
Revolving Loans Amortized to Basis | 48,728 |  | 48,501
Revolving Loans Converted to Term | 203 |  | 888
Total loans | 279,935 |  | 277,445
Current period gross charge-offs, 2024/2023 |  |  | 9
Current period gross charge-offs, 2023/2022 | 2 |  | 35
Current period gross charge-offs, 2022/2021 | 8 |  | 43
Current period gross charge-offs, 2021/2020 | 10 |  | 7
Current period gross charge-offs, 2020/2019 | 10 |  | 8
Current period gross charge-offs, Prior | 31 |  | 227
Current period gross charge-offs, Total | 61 |  | 329
Residential and Consumer | Residential mortgage |  |  |
Performing and non-performing outstanding balances of the residential and consumer portfolios |  |  |
2024/2023 | 2,145 |  | 14,576
2023/2022 | 14,498 |  | 11,620
2022/2021 | 11,444 |  | 61,172
2021/2020 | 60,531 |  | 44,049
2020/2019 | 43,569 |  | 7,092
PRIOR | 44,804 |  | 36,161
Total loans | 176,991 |  | 174,670
Current period gross charge-offs, Prior |  |  | 54
Current period gross charge-offs, Total |  |  | 54
Residential and Consumer | Consumer |  |  |
Performing and non-performing outstanding balances of the residential and consumer portfolios |  |  |
2024/2023 | 2,546 |  | 13,905
2023/2022 | 13,499 |  | 20,430
2022/2021 | 19,635 |  | 9,782
2021/2020 | 9,180 |  | 3,263
2020/2019 | 3,103 |  | 1,211
PRIOR | 6,050 |  | 4,795
Revolving Loans Amortized to Basis | 48,728 |  | 48,501
Revolving Loans Converted to Term | 203 |  | 888
Total loans | 102,944 |  | 102,775
Current period gross charge-offs, 2024/2023 |  |  | 9
Current period gross charge-offs, 2023/2022 | 2 |  | 35
Current period gross charge-offs, 2022/2021 | 8 |  | 43
Current period gross charge-offs, 2021/2020 | 10 |  | 7
Current period gross charge-offs, 2020/2019 | 10 |  | 8
Current period gross charge-offs, Prior | 31 |  | 173
Current period gross charge-offs, Total | 61 | $ 139 | 275
Performing | Residential and Consumer |  |  |
Performing and non-performing outstanding balances of the residential and consumer portfolios |  |  |
2024/2023 | 4,691 |  | 28,466
2023/2022 | 27,982 |  | 32,050
2022/2021 | 31,079 |  | 70,954
2021/2020 | 69,711 |  | 47,239
2020/2019 | 46,604 |  | 8,261
PRIOR | 49,590 |  | 39,958
Revolving Loans Amortized to Basis | 48,532 |  | 48,344
Revolving Loans Converted to Term | 203 |  | 667
Total loans | 278,392 |  | 275,939
Performing | Residential and Consumer | Residential mortgage |  |  |
Performing and non-performing outstanding balances of the residential and consumer portfolios |  |  |
2024/2023 | 2,145 |  | 14,576
2023/2022 | 14,498 |  | 11,620
2022/2021 | 11,444 |  | 61,172
2021/2020 | 60,531 |  | 44,049
2020/2019 | 43,569 |  | 7,092
PRIOR | 44,100 |  | 35,443
Total loans | 176,287 |  | 173,952
Performing | Residential and Consumer | Consumer |  |  |
Performing and non-performing outstanding balances of the residential and consumer portfolios |  |  |
2024/2023 | 2,546 |  | 13,890
2023/2022 | 13,484 |  | 20,430
2022/2021 | 19,635 |  | 9,782
2021/2020 | 9,180 |  | 3,190
2020/2019 | 3,035 |  | 1,169
PRIOR | 5,490 |  | 4,515
Revolving Loans Amortized to Basis | 48,532 |  | 48,344
Revolving Loans Converted to Term | 203 |  | 667
Total loans | 102,105 |  | 101,987
Non-performing | Residential and Consumer |  |  |
Performing and non-performing outstanding balances of the residential and consumer portfolios |  |  |
2024/2023 |  |  | 15
2023/2022 | 15 |  |
2021/2020 |  |  | 73
2020/2019 | 68 |  | 42
PRIOR | 1,264 |  | 998
Revolving Loans Amortized to Basis | 196 |  | 157
Revolving Loans Converted to Term |  |  | 221
Total loans | 1,543 |  | 1,506
Non-performing | Residential and Consumer | Residential mortgage |  |  |
Performing and non-performing outstanding balances of the residential and consumer portfolios |  |  |
PRIOR | 704 |  | 718
Total loans | 704 |  | 718
Non-performing | Residential and Consumer | Consumer |  |  |
Performing and non-performing outstanding balances of the residential and consumer portfolios |  |  |
2024/2023 |  |  | 15
2023/2022 | 15 |  |
2021/2020 |  |  | 73
2020/2019 | 68 |  | 42
PRIOR | 560 |  | 280
Revolving Loans Amortized to Basis | 196 |  | 157
Revolving Loans Converted to Term |  |  | 221
Total loans | $ 839 |  | $ 788

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