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Fair value measurement - Assets measured at fair value on nonrecurring basis (Details) - Nonrecurring - USD ($)
$ in Thousands
 9 Months Ended
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