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Fair value measurement - Assets measured at fair value on nonrecurring basis (Details) - Nonrecurring - Fair Value by Asset Class [Domain] - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans $ 41,793 $ 84,075
Other real estate 15,065 33,457
Other foreclosed assets 1,220 2,597
Total 58,078 120,129
Loans - write-down (10,605) (18,767)
Other real estate owned - write down (2,937) (6,967)
Other foreclosed assets - write down (135) (970)
Total assets measured - write down (13,677) (26,704)
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 0 0
Other real estate 0 0
Other foreclosed assets 0 0
Total 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 0 0
Other real estate 0 0
Other foreclosed assets 0 0
Total 0 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 41,793 84,075
Other real estate 15,065 33,457
Other foreclosed assets 1,220 2,597
Total $ 58,078 $ 120,129