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Subordinated debt (Details) - 2020 Notes - USD ($)
$ in Thousands
Jun. 01, 2020
Jan. 01, 2020
Debt Instrument [Line Items]    
Aggregate principal amount $ 33,000  
Rate of interest for first five years 5.375%  
Duration interest rate in effect   5 years
Percentage of debt redeemed 100.00%  
Minimum    
Debt Instrument [Line Items]    
Floated interest rate 4.75%  
Number of days notice to redeem debt 10 days