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Fair value of financial instruments - Schedule of Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Other real estate owned	$ 1,500
Nonrecurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Loans individually evaluated for credit loss	14,236	$ 22,164
Other real estate owned	2,685	738
Nonrecurring Basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Loans individually evaluated for credit loss	14,236	22,164
Other real estate owned	$ 2,685	$ 738

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