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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, 2025 | Sep. 30, 2024
Financing Receivable, Modified [Line Items] |  |  |
Amortized Cost | $ 96 | $ 3,545 | $ 450
% of Total Class of Loans | 0.00% | 0.20% | 0.00%
Term Extension |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Amortized Cost | $ 96 | $ 3,545 | $ 432
Interest Rate Reduction |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Amortized Cost |  |  | 18
Commercial real estate | Term Extension |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Amortized Cost | $ 96 | $ 3,545 | $ 96
% of Total Class of Loans | 0.00% | 0.40% | 0.00%
Residential mortgage | Term Extension |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Amortized Cost |  |  | $ 336
% of Total Class of Loans |  |  | 0.10%
Residential mortgage | Interest Rate Reduction |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Amortized Cost |  |  | $ 18
% of Total Class of Loans |  |  | 0.00%

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