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Fair value measurement - Assets measured at fair value on nonrecurring basis (Details) - Nonrecurring - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans |  | $ 4,166
Other real estate owned | $ 3,983 | 5,749
Other foreclosed assets | 196 | 174
Total assets measured at fair value on non-recurring basis | 4,179 | 10,089
Loans - write-down |  | (654)
Other real estate owned - write down | (1,351) | (1,889)
Other foreclosed assets - write down | (51) | (38)
Total assets measured - write down | (1,402) | (2,581)
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans |  | 0
Other real estate owned | 0 | 0
Other foreclosed assets | 0 | 0
Total assets measured at fair value on non-recurring basis | 0 | 0
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans |  | 0
Other real estate owned | 0 | 0
Other foreclosed assets | 0 | 0
Total assets measured at fair value on non-recurring basis | 0 | 0
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans |  | 4,166
Other real estate owned | 3,983 | 5,749
Other foreclosed assets | 196 | 174
Total assets measured at fair value on non-recurring basis | $ 4,179 | $ 10,089

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