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Fair value measurement - Assets measured at fair value on nonrecurring basis (Details) - Nonrecurring - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans $ 4,361 $ 2,039
Loans held-for-sales   3,028
Other real estate owned 3,919 4,426
Other foreclosed assets 162 211
Total assets measured at fair value on non-recurring basis 8,442 9,704
Loans - write-down (91) (329)
Loans held-for-sale - write-down   (38)
Other real estate owned - write down (1,573) (1,602)
Other foreclosed assets - write down (46) (46)
Total assets measured - write down (1,710) (2,015)
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 0 0
Loans held-for-sales   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 0
Loans held-for-sales   3,028
Other real estate owned 0 0
Other foreclosed assets 0 0
Total assets measured at fair value on non-recurring basis 0 3,028
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 4,361 2,039
Loans held-for-sales   0
Other real estate owned 3,919 4,426
Other foreclosed assets 162 211
Total assets measured at fair value on non-recurring basis $ 8,442 $ 6,676