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Short-term borrowings - Additional Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Short-term Debt    
Maximum borrowing capacity $ 18,000 $ 18,000
Outstanding amount in borrowings 0 $ 0
Peoples Bank    
Short-term Debt    
Maximum borrowing capacity 700,169  
Outstanding amount in borrowings 124,406  
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits $ 171,970