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Subordinated debt (Details) - 2020 Notes
$ in Thousands
Jun. 01, 2020
USD ($)
Debt Instrument  
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  
Floated interest rate 4.75%
Number of days notice to redeem debt 10 days