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Loans - Amortized cost basis of loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Financing Receivable, Modifications [Line Items] |  |  |  |
Amortized Cost | $ 96 | $ 1,040 | $ 450 | $ 1,085
% of Total Class of Financing Receivable | 0.00% | 0.10% | 0.00% | 0.10%
Term Extension |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Amortized Cost | $ 96 | $ 1,040 | $ 432 | $ 1,040
Interest Rate Reduction |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Amortized Cost |  |  | 18 | 45
Commercial real estate | Term Extension |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Amortized Cost | $ 96 | $ 969 | $ 96 | $ 969
% of Total Class of Financing Receivable | 0.00% | 0.20% | 0.00% | 0.20%
Commercial real estate | Interest Rate Reduction |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Amortized Cost |  |  |  | $ 45
% of Total Class of Financing Receivable |  |  |  | 0.00%
Residential mortgage | Term Extension |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Amortized Cost |  | $ 71 | $ 336 | $ 71
% of Total Class of Financing Receivable |  | 0.00% | 0.10% | 0.00%
Residential mortgage | Interest Rate Reduction |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Amortized Cost |  |  | $ 18 |
% of Total Class of Financing Receivable |  |  | 0.00% |

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