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Short-term borrowings - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Short-term Debt    
Decrease in borrowings $ 22,500  
Peoples Bank    
Short-term Debt    
Maximum borrowing capacity 706,525 $ 700,169
Outstanding amount in borrowings $ 146,446 $ 124,406