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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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- Definition

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