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Borrowings - Additional Information (Details) - Peoples Bank - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Short-term Debt    
Maximum borrowing capacity $ 775,458 $ 723,608
Outstanding amount in borrowings 196,400 184,883
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits $ 155,800 $ 185,750